Parker D-Pak Manual

Hydraulic Power Units
D, H, V-Pak and Custom Power Units
HY28-2600-550-M1USA May 2019

HY28-2600-550-M1/USA HY28-2600-550-M1/USA
Standard Hydraulic Power Units Installation and Maintenance Manual
D, H, V-Pak and Custom Power Units
Standard Hydraulic Power Units Installation and Maintenance Manual
D, H, V-Pak and Custom Power Units
1
1
Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Contents
Contents
Introduction ..................................................................................................................................................................................................................................................1
Description ....................................................................................................................................................................................................................................................1
Preparation for Use.....................................................................................................................................................................................................................................2
Installation .....................................................................................................................................................................................................................................................2
Electrical Service Connections ...............................................................................................................................................................................................................3
Inverter (DCP) Wiring Information .......................................................................................................................................................................................................4
Component Location (Typical)...............................................................................................................................................................................................................6
Supply and Return Connections............................................................................................................................................................................................................8
Reservoir Filling............................................................................................................................................................................................................................................8
Start-Up Procedure.....................................................................................................................................................................................................................................9
General Maintenance..............................................................................................................................................................................................................................11
D-Pak Parts List..........................................................................................................................................................................................................................................15
H-Pak Parts List.......................................................................................................................................................................................................................................... 17
V-Pak Parts List ..........................................................................................................................................................................................................................................20
V8, Low Prole Parts List ........................................................................................................................................................................................................................23
Troubleshooting ....................................................................................................................................................................................................................................... 26
Power Unit Weights .................................................................................................................................................................................................................................28
Oer of Sale................................................................................................................................................................................................................................................31
WARNING - USER RESPONSIBILITY
FAILURE OR IMPROPER SELECTION OR IMPROPER USE OF THE PRODUCTS DESCRIBED HEREIN OR RELATED ITEMS
CAN CAUSE DEATH, PERSONAL INJURY AND PROPERTY DAMAGE.
This document and other information from Parker-Hannin Corporation, its subsidiaries and authorized distributors provide product
or system options for further investigation by users having technical expertise. The user, through its own analysis and testing, is solely
responsible for making the nal selection of the system and components and assuring that all performance, endurance, maintenance,
safety and warning requirements of the application are met. The user must analyze all aspects of the application, follow applicable
industry standards, and follow the information concerning the product in the current product catalog and in any other materials provided
from Parker or its subsidiaries or authorized distributors. To the extent that Parker or its subsidiaries or authorized distributors provide
component or system options based upon data or specications provided by the user, the user is responsible for determining that such
data and specications are suitable and sucient for all applications and reasonably foreseeable uses of the components or systems.
Oer of Sale
The items described in this document are hereby oered for sale by Parker-Hannin Corporation, its subsidiaries or its authorized distributor.
This oer and its acceptance are governed by the provisions stated in the detailed“Oer of Sale”elsewhere in this document.
!
!
Introduction
Introduction
This manual provides descriptive operation and
maintenance instructions for standard Hydraulic Power
Units manufactured by the Hydraulic Pump and Power
Systems Division of Parker Hannin Corporation. Any
additional information may be obtained from Parker by
referencing the unit’s model number and serial number
stamped on the Reservoir Nameplate, or by contacting
your local authorized Parker Distributor.
Some of the information in this manual may not apply
to your power unit. Your power unit may include
non-cataloged equipment or contain additional
components that were added after factory shipment
from Parker, in which case this manual will not include
information and possible required warnings regarding
this additional equipment.
WARNING:
It is imperative that personnel involved in the
installation, service and operation of the power
unit be familiar with how the equipment is to be
used. They should be aware of the limitations of
the system and its component parts, and have
knowledge of good hydraulic practices in terms
of safety, installation and maintenance.
Description
Parker’s standard power units feature a vertical design,
with the pump/motor assembly vertically mounted to
the reservoir’s top plate. This minimizes the required
oor space and keeps the pump’s inlet ooded or nearly
ooded with oil, preventing cavitation. Make sure to
match the design series of your unit with the design
series numbers in this manual. If your design series
doesn’t match the design series numbers shown
later in this manual, consult the factory to verify form,
t and function of replacement parts. In the example
below, the design series is“21”.
D-Paks and H-Paks use xed volume gear pumps.
V-Paks use variable volume piston pumps and are
available with several standard pressure compensation
options, load sense and horsepower limiting options.
See catalog HY28-2661-CD/US for more information
on Parker’s standard power units. Parker also makes
modications to the cataloged units, and these units
have X numbered suxes. Most of the information
contained in this document will apply to those units
as well.
LABEL
Model number Design series
Tank size (gal)
Serial number
Pump ow (max)
Max pressure @ rated
ow and horsepower
V8 Power Units are obsolete as of Oct 2017

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Standard Hydraulic Power Units Installation and Maintenance Manual
D, H, V-Pak and Custom Power Units
Standard Hydraulic Power Units Installation and Maintenance Manual
D, H, V-Pak and Custom Power Units
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Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Preparation for Use Electrical Service Connections
Preparation for Use
Unpacking and Checking
The power unit is mounted on skids and carefully
packed for shipment. Do not remove it from the skid
until it has been carefully checked for damage that
may have occurred in transit. Report all damage
immediately to the carrier and send a copy to the
vendor. All open ports on the power unit are plugged
at the factory to prevent the entry of contamination.
These plugs must not be removed until just before
piping connections are made to the unit.
Storage
If the power unit is not going to be installed
immediately, it should be stored indoors, covered
with a waterproof sheet, and have all open ports
plugged. If long-term storage is expected (6 months
or more), we recommend lling the reservoir
completely with clean hydraulic uid to prevent
the entry of moisture.
Removing from Shipping Skids
Vertical power units should be removed from the skid
by wrapping a heavy-duty nylon strap around the base
of the motor mounting feet or by the lift eyes that may
be on the unit. This strap should be rmly secured to
the lifting device when unit is lifted. The power unit
may have lag bolts securing it to the shipping pallet,
so be sure to remove these bolts before lifting.
Do not use the lift eye in the motor. It is designed to
lift only the electric motor, not the entire power unit.
Do not lift a unit that is full of oil.
Installation
Locating Power Unit
The unit should be installed indoors, and preferably in a
clean, dry environment with an ambient temperature of 60
to 100° F (15 to 38º C). The unit can be installed outdoors
if the reservoir was provided with optional weatherproof
construction, and provisions were made for extreme
temperature conditions. The reservoir can be secured to the
oor or base using the four mounting holes located on the
reservoir legs or reservoir base plate.
The power unit should be located close to the point of
use. It is strongly recommended that any directional
valves controlling the actuators be located as close
as possible to those actuators. This means that if the
power unit is installed away from the actuators, the
directional valves should be remote from the power
unit and as close as possible to the actuators. System
shock, response time and noise are greatly reduced by
minimizing the distance between the actuators and
the valves.
Condensation/Rust
Frequent temperature changes can lead to rust
developing inside the reservoir. As air moves in and out
of the reservoir with uid level changes, warm humid
air can condense when temperatures drop, creating
rust on the underside of the top plate and exposed
tank sides. Moisture also can turn the oil acidic,
leading to varnish and pitting of components. Keeping
the oil level as high as possible without overlling is
recommended, but remember oil will expand when hot
so do not over ll. Maintaining reservoir temperature
with an auxiliary heater can minimize these eects.
Optional desiccant breathers and/or stainless tanks
are available for extreme conditions.
Electrical Service Connections
Water
If water cooled heat exchanger has been provided:
Connect the water supply to the inlet of the
heat exchanger with a shut-o valve and strainer (if
not supplied by Parker). If a temperature control valve
(Model WTC**) has been provided, it also should
be installed on the inlet side. The outlet of the heat
exchanger should be connected directly to the facility
drain system. On single pass heat exchangers, the
water connections should be installed as shown
below to maximize heat transfer. On multi-pass heat
exchangers, the water ow direction is not important
unless otherwise instructed by the heat exchanger
manufacturer. (See Figure 1)
Electrical
Non-inverter units: Verify that the available voltage
is the same as the voltage identied on the motor
nameplate. Most motors have dual voltage ratings
(230/460), so verify that the leads in the motor
conduit box have been connected together as
Figure 2
dened on the motor nameplate to match the
facility power source available. Connect the
pump motor to the power source following the good
practices as outlined in the National Electric Code and
any local codes that may apply. If solenoid valves,
pressure/temperature switches or oil immersion
heaters have been provided on the power unit, refer to
the component name tag or other service information
in this manual for operating voltage and ratings.
DCP, or units with inverter: Verify that the available
voltage is the same as the voltage rating of the
inverter. Connect the drive to a power source following
the good practices as outlined in the National Electric
Code and any local codes that may apply. The Parker
DCP units have a local disconnect to isolate the drive
from incoming power. This disconnect turns power o
to the drive and allows the motor connections to be
checked. Even when the motor is not running, there
is high voltage present on the motor leads if power
to the drive is present unless the disconnect is in
the “OFF” position.
WARNING:
DCPs, or units with the AC10 inverter, must have
branch circuit protection with a maximum rating
of 5KVA.
Figure 1
Disconnect
Factory-installed
shielded cable
from the drive to
the electric motor
Water
outlet
Heat exchanger
Oil in Oil out
Temperature
control valve
Oil sensing bulb
Water
inlet
Shut-off
valve
Strainer

HY28-2600-550-M1/USA HY28-2600-550-M1/USA
Standard Hydraulic Power Units Installation and Maintenance Manual
D, H, V-Pak and Custom Power Units
Standard Hydraulic Power Units Installation and Maintenance Manual
D, H, V-Pak and Custom Power Units
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Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Wiring Information
Inverter (DCP) Wiring Information
This section covers main power wiring. Control
wiring is application/model code specic. For more
information regarding control wiring, see Catalog
HY28-2661-CD/US Mar 31, 2016 or later.
The electric motor has been factory-wired to the drive
using shielded cable. The cord grips on this cable are
designed to connect the cable’s shield to the drive’s
frame. Proper grounding of the drive is important for
user safety and the ability to minimize electrical noise.
Connect the proper voltage 3 phase power to the
back of AC10’s disconnect switch (220VAC +/-15% or
480VAC +10/-15% depending on the drive selected).
Remove the drive’s
cover by removing
the Phillips screws
around the front of
the unit
Install an
appropriate cord
grip through one
of the knock-outs
in the bottom
steel plate for the
incoming power
connection
Connect incoming power here
Ground connection: This connection
must be made to a suitable ground (PE)
Wiring Information
Image
Note About Motor Wiring:
• In general, the actual incoming voltage can be
+/-10% of the motor nameplate voltage rating, as
long as the frequency is correct.
• The ampacity of the wires feeding the electric motor
or inverter drive must be properly sized to handle the
F.L.A. rating of the motor.
• Make sure the connections inside the motor’s
terminal box are secure and cannot come loose with
vibration. Lethal shock, arc ash and or electrical
re can result if these connections come loose.
• When a motor is connected to an across-the-line
starter, its rotation can be changed by swapping
any two of the three leads. If the rotation is incorrect
on a system with an inverter, two of the three leads
between the drive and motor must be swapped. Do
not swap the power connection leads to the drive
as this will have no eect on rotation. Factory
installed drives are tested to verify correct rotation.
• 60 Hz motors rated for 230/460 volts can be
operated on 50Hz at 190/380 volts, but the available
power of the motor is reduced approximately 15%.
Dual rated 50/60Hz motors are optionally available.
However, their service factor is reduced from 1.15 to
1.0 at 50Hz.* All dual rated motors have a CSA and
CE stamp. In the case of using the DCP, incoming
frequency to the drive does NOT aect motor
speed, however incoming voltage aects motor
torque. If this voltage is less than nameplate voltage,
the motor will need to be de-rated.
*The 2Hp and 3Hp motors have a 1.15SF at 60 Hz and 50Hz.
Temp/Level Switch
The standard temp/level switch is a discrete device
with no adjustment. The R1 is normally closed held
OPEN (no connection) when oil level is OK and
temperature is below 150º F (66º C).
The R2 version is normally open held CLOSED
(connection) when the oil level is OK and the temperature
is below 150º F (66º C). R2 is preferable because the logic
of the monitoring device will detect a fault even if there is
no connection to the temp/level switch.
Wiring Info
Common= Black
Float Level = Yellow
Temperature = Red & White
Float Switch
1.5 Amps (50 va) max, 1 mv to 260 VAC or
200 VDC max
Temp Switch
8 Amps (800 va) max @ 110 VAC, 1 mv to 240 VAC or
36 VDC max Changes state at 150ºF (66ºC)
Ground
Terminal

HY28-2600-550-M1/USA HY28-2600-550-M1/USA
Standard Hydraulic Power Units Installation and Maintenance Manual
D, H, V-Pak and Custom Power Units
Standard Hydraulic Power Units Installation and Maintenance Manual
D, H, V-Pak and Custom Power Units
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Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Component Location Notes
Component Location (Typical)
This shows the typical component location for a
20-gallon H-Pak. Exact conguration depends on
options selected.
Image
Tank drain (SAE #12)
Strainer (inside reservoir)
Pressure lter
Temp/level gage
Gasket material
Lift eye
Filler breather
Electric motor
Heat exchanger
Return lter
Pressure gage
Gage shut-o
Connection block
3/4" NPT #12 spare
return coupling
Heat exchanger bypass
(65 PSI check valve)
inside reservoir
3/4" NPT weld coupling
(for customer use, water
valve, temperature
switch,etc.)
Solenoid
unloading valve
Temp/level
switch

HY28-2600-550-M1/USA HY28-2600-550-M1/USA
Standard Hydraulic Power Units Installation and Maintenance Manual
D, H, V-Pak and Custom Power Units
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D, H, V-Pak and Custom Power Units
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Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Supply and Return Connections
Supply and Return Connections
Complete all necessary interconnecting piping
between the power unit and hydraulic actuators. The
line sizes should be determined based on oil ow,
operating pressure, viscosity and allowable pressure
drop between the power unit and point of use. The
exact connection details will depend on how the power
unit was ordered. If the unit was ordered with a PT
block, the top plate will have a block with a“P” and a
“T” stamped on it. The“P” is the pressure connection,
and the “T” is the tank or return connection. If the
unit was ordered with a manifold option, there will be
ports labeled “A” and “B.”These are connections that
normally go directly to the customer’s actuator ports.
The actuator is controlled by valves mounted on the
manifold. These valves could be supplied from the
factory or added by a third party or the customer.
WARNING:
Check to ensure that the proper rated hose or
pipe is used on pressure lines. It is the customer’s
responsibility to select the proper hose or tube
style to ensure safe and reliable performance.
Improper selection of the interconnecting plumbing
can cause serious injury or death. Make sure
you fully understand the requirements for a safe
installation or contact professional assistance.
Make sure vibration and thermal expansion are
considered. Straight tube runs should include
bends to accommodate thermal expansion and
contraction. If the power unit is mounted on a
separate base from the rest of the installation,
exible hose may be required to absorb possible
relative movement.
Important:
One of the key ingredients for good service and long
life from a hydraulic system is cleanliness. Since most
dirt inltrates a hydraulic system during installation,
Parker recommends the following:
1. All open ports on the power unit, cylinders,
etc. must remain plugged with tape or plastic
plugs until just before the hydraulic connections
are made.
2. All interconnecting tubing, pipe or hose should be
clean and free of rust, scale and dirt. The ends of
all connectors should be plugged until just before
they are to be installed in the system.
Start-Up Procedure
Start-Up Procedure
NOTE:
If the power unit has been provided with a variable
displacement pump (V-Pak), the pump case should
be lled with clean oil prior to priming. Located on the
power unit’s top plate, there is a port labeled “Pump
Case.” Remove the plug from this port, ll it with oil
and then replace the plug. See right:
Before proceeding to the rest of the start-up
procedure, wear proper personal protective
equipment. Safety glasses and gloves are the
minimum required items to avoid exposure and
injury from unexpected high-pressure oil leaks.
1. If the system has a standard solenoid controlled
unloading valve, it should be turned o to allow
the system to start up at minimum pressure. A few
special systems have a normally closed unloading
valve, in which case it should be energized to get
low pressure.
2. If the system has been provided with an open
center directional valve, the oil during start-up will
ow directly back to tank when neither solenoid is
energized. This should allow the system to prime
very quickly.
3. All openings in the reservoir such as the ller
breather or access end cover holes must remain
closed during installation.
4. If Teon tape or pipe dope is used, be sure it
doesn’t extend beyond the rst thread of the
pipe tting.
Reservoir Filling
The reservoir must be lled with clean uid through
the ller cap on the reservoir. The type of uid must be
compatible with the seals used on the power unit, and
must comply with the recommendations of the
manufacturers of the component parts. Refer to the
component manufacturer’s catalog for uid requirements.
The cleanliness of the uid going into the reservoir
is very important, and in most cases, even new oil out
of the drum is not adequate. We recommend that any
uid being transferred into the reservoir be done with a
transfer pump with a 10-micron lter installed. Various
Parker oil transfer pumps are available for this purpose.
Additionally, Parker sells pre-cleaned uid called
DuraCleanTM. This uid is clean from the drum and has
additives that resist moisture buildup, reducing varnish
and oxidation.
Cautions About Filling
Power units should be lled while they are not running,
especially if there is an accumulator in the system. If a
system has an accumulator and the oil level is“FULL”
when running, the oil level will likely overow when the
system is turned o.
After the initial ll, re-check the oil level after the
system has been in operation for a few cycles. In
some installations, the actuators and plumbing will
“consume”enough oil that the system will need
another ll to prevent it from running low during the
machine cycle.
Pressure lter manifold
Pressure gage w/ shuto
Relief valve (set higher
than pump compensator
Spare return w/ down
tube 3/4" NPT female
Return lter Temp/level
switch
Pump prell port
(8 to 15 GPM only)
Remote compensator
(set lower than main relief)
Filler breather
3. Fixed volume systems (D and H Paks) will have a
P to T open path if it is equipped with an unloading
option. On V Paks, the unloading option unloads
the pump compensator, not the main pressure line,
therefore additional work to prime the system may
be required.
4. Turn the main relief valve all the way down
(counter clockwise).
5. Jog the pump motor once, and verify that the
pump is rotating in the same direction as the
arrow tag on the motor fan cover. If the direction
is incorrect, reverse any two (2) of the three (3)
motor leads, and re-check the rotation. Most units
are right hand rotation, or clockwise looking down
at the motor fan. If the unit has a rear mount heat
exchanger, you may need to use a small piece
of thin wire or zip tie to“feel” which direction the
motor’s fan is turning.
6. Jog the pump/motor three (3) to six (6) times to
prime the pump and then allow the pump to run
for several minutes at minimum pressure. Check
the piping for any leaks and correct immediately.
(Leaks in ttings and tubing can be the result of
vibration during shipping.)

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Standard Hydraulic Power Units Installation and Maintenance Manual
D, H, V-Pak and Custom Power Units
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D, H, V-Pak and Custom Power Units
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Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Start-Up Procedure Maintenance
7. If the system has not primed, the pressure line
may need to be bled. Do not use ports with O-ring
seals for bleeding, as the oil will cut the O-ring.
One suggestion for bleeding is to close the needle
valve at the base of the pressure gage, remove
the pressure gage, then run a small hose from the
needle valve back to the tank breather opening.
With the needle valve just slightly open (1/2-1
turn), jog the pump until oil comes out of the hose.
Replace the pressure gage, close the breather and
resume startup.
8. Begin adjusting the relief valve and/or pump
compensator to increase the pressure gradually.
NOTE:
On systems with open-center directional valves,
it will be necessary to actuate the valve in order
to build pressure.
9. Continue increasing pressure and checking
connections until normal operating pressure is
obtained. Lock adjustment screws in place.
NOTE:
If the system has been provided with a pressure
compensated pump and a relief valve, adjust
the relief valve approximately 200 psi higher than
the compensator so that excessive heat is not
generated by the relief valve. If the relief and the
compensator are set too close to each other,
the system pressure will oscillate or hunt. The
pump compensator should be the device that
limits system pressure, while the main relief is a
redundant pressure limiter that reduces pressure
spikes the pump can’t respond to.
10. During the start-up sequence, all lters should be
monitored closely. Replace any lter elements as
soon as they begin to go into by-pass as indicated
on the visual indicator.
11. After the entire system has been wetted with uid,
rell the reservoir to the normal operating level.
Water Control Valve (if Equipped)
Units that have a heat exchanger and water control
valve may require adjustment. The valves are
adjustable between 75 to 135º F (24 to 58º C). Turning
the adjustment screw clockwise decreases the valve’s
opening temperature. The maximum recommended
oil temperature for most hydraulic systems is 120º F
(49º C). Running above this temperature increases the
chance for causing burns and accelerates oxidation
of the oil, which creates deposits and varnish in
the system.
Image
General Maintenance
Electric Motors – Lubricate as recommended by the
motor vendor.
Filters – Change lter elements when indicated by the
lter’s mechanical or electrical indicator. New power
unit installs will typically have short element life until
the oil is cleaned by repeated passes through the
lter(s). When using electrical indicators, a short time
delay in the logic that reads the indicator is advisable
to prevent false alarms (0.1 – 0.25 seconds is typical).
Suction Strainers – Strainers should be cleaned
anytime it is suspected that the pump is starving
for oil. When the suction strainer is the only lter in
the system, it will clog much sooner than if there
are additional lters present. Modern systems with
proper ltration rarely have their suction strainers clog;
however heavy varnish, a failed return lter element
or other similar event could cause a rapid clogging of
the strainer.
The exact lter and strainer part numbers are model
code dependent. Contact your local distributor or
Parker’s Hydraulic Pump and Power Systems Division
Tech Support for replacement part number information.
Pump/Motor Coupling – Under normal conditions
the pump/motor coupling will last many years.
Heavy cycling, uid compatibility or the loss of solid
attachment to the pump or motor shaft can cause the
coupling or its insert to fail. Whenever the top plate is
raised for inspection inside the tank, inspect the
pump/motor coupling for signs of wear. If the coupling
is replaced, make sure there is a small gap (approx.
1/32 – 3/32 of an inch) between the two coupling
halves to prevent axial loading when the pump and
motor get warm.
Reservoirs – Maintain proper oil level at all times.
The oil should be sampled and checked after the
rst 100 hours of operation to verify that cleanliness
and moisture are in acceptable ranges. Occasional
sampling after that point is recommended. A robust
sampling program can help ensure the oil is properly
maintained and can assist in root cause analysis if
there is a component failure.
Paint – Parker’s standard paint for these units is
Sherwin Williams quick dry enamel, F77A3 Machine
Tool Grey.
Sensing Bulb
1/2" NPT
Connector
Range
adjusting
screw
6' armored
capillary
0.30 – .06 TYP

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Standard Hydraulic Power Units Installation and Maintenance Manual
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Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
MaintenanceNotes
Maintenance Suggestions
1. Set up a lter maintenance schedule and follow
it diligently.
2. Inspect lter elements that have been removed
from the system for signs of failure which may
indicate that the service interval should be
shortened, the oils viscosity is too high or too
cold, or that the lter is undersized.
3. Never return to the system any uid that has
leaked out.
4. Always keep the supply of fresh uid
covered tightly.
5. Use clean containers, hoses and funnels when
lling the reservoir. Use of a lter cart when adding
oil is highly recommended.
6. Use common sense precautions to prevent entry
of dirt into components that have been temporarily
removed from the circuit.
7. Make sure that all clean-out holes, lter caps
and breather cap lters on the reservoir are
properly fastened.
8. Do not run the system unless all normally provided
ltration devices are in place.
9. Make certain that the uid used in the system is of
a type recommended by the manufacturers of the
system or components.
10. Before changing from one type of uid to
another (e.g., from petroleum base oil to a re
resistant uid), consult component and lter
manufacturers in the selection of the uid and
lters that should be used. Also consult the
publication“Recommended Practice for the Use
of Fire Resistant Fluids for Fluid Power Systems”
published by the National Fluid Power Association.
11. Parker oers an oil sampling kit, which can be
used to ascertain the condition of the system uid.
Maintaining Proper Oil Temperature
Hot oil in your equipment’s hydraulic system is one
of the primary causes of poor operation, component
failure and downtime. Here are some pointers on
maintaining proper oil temperature. The oil in your
hydraulic system was designed for operation within
a specied temperature range. You may be able to
run it at hotter temperatures for short periods of time,
intermittently, without adverse eects. If you run
continuously with oil that’s too hot, your equipment
will operate poorly causing key component failure
and machine downtime.
“Hot oil” is a relative term. In most cases, 120° F
(49º C) at the reservoir is considered an ideal operating
temperature. Always take an oil temperature reading
at the reservoir, not at a component or any of the
piping. Some hydraulic systems are designed to
operate at 130° F (54º C) or higher. If you don’t
know the maximum operating temperature for your
equipment, check your component manual for
temperature and viscosity limitations.
How Can You Keep Your Equipment’s Hydraulic
System From Running Too Hot?
1. Set up a regular schedule for checking the
oil temperature, appearance, smell and feel.
Change oil as recommended by the equipment
manufacturer.
2. If relief or ow-control valves are running hot,
check and adjust their settings. Follow your
equipment owner’s manual.
3. Consider adding an unloading circuit to reduce
system pressure between machine cycles.
4. Consider using a VFD for motor control. Most
machine cycles require maximum motor speed
for only a brief part of the cycle. Heat, noise
and power reductions can be substantial when
using a VFD. Contact Parker or your local Parker
distributor for information regarding our Drive
Controlled Pump (DCP).

HY28-2600-550-M1/USA HY28-2600-550-M1/USA
Standard Hydraulic Power Units Installation and Maintenance Manual
D, H, V-Pak and Custom Power Units
Standard Hydraulic Power Units Installation and Maintenance Manual
D, H, V-Pak and Custom Power Units
15
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Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Maintenance Parts List
5. Keep your equipment clean. A thick layer of dirt
acts as insulation. It will prevent the hydraulic
system from getting rid of heat.
6. Proper heat exchanger selection is crucial. If a
variable system (V-Pak) runs compensated most
of the time, a return line heat exchanger won’t be
as eective as a case drain cooler. An oversized
cooler will be less ecient than a smaller cooler at
low ows. Some systems, especially ones that run
continuously above 1500 psi may require oine
(kidney loop) cooling.
7. On a variable volume system (V-Pak), make
sure the main relief is set HIGHER than the
pump compensator. If the pump compensator
is set higher than the main relief, oil will ow
continuously across the relief creating noise and
a lot of heat. Electrical power consumption will
also increase.
NOTE:
When using high water content uids, high
temperatures are very detrimental to the entire system.
The balance of water to additives is quickly disrupted,
causing the uid to lose its proper characteristics.
D-Pak Parts List
The D-Pak parts list is for standard units, design series
21, with directional valve information excluded. If your
unit is a dierent design series, the form, t and function
of replacement parts may not match your parts.
D-Pak (D5) Parts List – Design Series 21
Universal Parts Part Number
5" level gage 875033-05
Suction strainer 875035-03
Filler breather 875034
Gasket (manifold) 875576-04
Pressure gage 875053-**** **** = Max pressure on gage
U-shaped tank edge rubber 875041-48 48" Long, trim to t
Needle valve (gage) N400S
Unloader Options
Option Block 2-Way Valve Coil
Omit 876377 Cover plate N/A
BBD03-PT-A DSL101NRM CAP115D
JCAP024D
D-Pak Bell Housing Gasket and Coupling Part Numbers
Flow/HP
Combinations
HP Gasket Number Motor Coupling Pump Coupling Insert
U1, T1, T3, DG 875577-01 L-075 5/8X3/16 L-075 1/2X1/8 L-075U
DK 875577-02 68514411518 876975 68514411499
D-Pak Pump Part Numbers
Pump Flow Pump
0.9 331-9110-267
1.3 331-9110-011
1.8 331-9110-010
2.7 331-9110-101
D-Pak Motor Part Numbers
Option (HP) Voltage/Frequency Ratings Motor Part Number
U1 (1/2) 115/208-230 1Ph 60Hz 875054-02
T1 (1) 115/230-230 1Ph 60Hz 875054-07
T3 (1) 208-230/460 3Ph 60Hz 875054-14
DG (2) 208-230/460 3Ph 60Hz
190/380 50Hz 133-60021-0
DK (3) 208-230/460 3Ph 60Hz
190/380 50Hz 133-60022-0
Gear pumps, lters and valves should be purchased from
their respective source Parker Divisions. Parts unique to
the power unit (variable piston pumps, gaskets, special
manifolds, etc.) should be purchased from Parker’s
Hydraulic Pump and Power Systems Division.

HY28-2600-550-M1/USA HY28-2600-550-M1/USA
Standard Hydraulic Power Units Installation and Maintenance Manual
D, H, V-Pak and Custom Power Units
Standard Hydraulic Power Units Installation and Maintenance Manual
D, H, V-Pak and Custom Power Units
17
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Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Parts List Parts List
H-Pak Parts List
The H-Pak parts list is for standard units, design series
14, with directional valve information excluded. If your
unit is a dierent design series, the form, t and function
of replacement parts may not match your parts.
The pressure lter is a standard aluminum 15P lter. For high pressure/high fatigue applications
(above 2000 psi), an optional steel manifold and special 15P with a steel head is available.
Charts
D-Pak Accessories Parts List
Option Description Part Number Filter Element
B1 Rear mt heat ex RM-08-2-2
Bracket 875225 (2 pc)
H
Pressure lter
(STD aluminum) 15P110QBRSKX1 932612Q
Pressure lter (steel head) 15P110QB16690
Manifold 876526 (aluminum)
876526-S (steel)
Gasket 875576-16
KCheck valve DT-370-MOMF-05
LCheck valve C1020S65
OReturn lter 12AT10CN15MMH 921999
R1
Switch housing w/cover 876620
Float switch 876782-01
Gasket 875576-14 (2 pc required)
R2
Switch housing w/cover 876620
Float switch 876782-02
Gasket 875576-14 (2 pc required)
H-Pak (H1-H4) Parts List – Design Series 14
Description Part Number Notes
5" Level gage 875033-05
10" Level gage 875033-10
Filler breather 875034
Pressure gage 875053-**** **** = Max pressure on gage
U-shaped tank edge rubber 875041-72 10 Gal tank, 72" long, trim to t
U-shaped tank edge rubber 875041-78 20-40 Gal tank, 78" long, trim to t
Needle valve (gage) N400S
Unloader Options
Option Block 2-Way Valve Coil
Omit 876377 Cover plate N/A 875576-13
B, J See pump/strainer/unloading valve/gasket information
H-Pak Pump/Strainer/Unloading Valve/Gasket Information
Pump Flow Pump Suction Strainer 2-Way Valve &
Solenoid
Pressure/Tank
Connections
Remote Body or
Cartpak
Unloading Valve
Gasket
0.9 331-9110-267
875035-03
DSL101NRM
CAP115D (AC)
CAP024D (DC)
O, S5, M5* => 875970 (aluminum)
S3,M3* => BD03-PT-A 875576-13
1.3 331-9110-011
1.8 331-9110-010
2.7 331-9110-101
3.2 334-9111-069
875035-10
4.5 334-9111-068
5.1 334-9111-067
6.3 334-9111-048 DSH161NRM
CAP115D (AC)
CAP024D (DC)
ALL => 878483 (aluminum) 875576-178.1 334-9111-065
9.6 334-9111-049
Gear pumps, lters and valves should be purchased from
their respective source Parker Divisions. Parts unique to
the power unit (variable piston pumps, gaskets, special
manifolds, etc.) should be purchased from Parker’s
Hydraulic Pump and Power Systems Division.

HY28-2600-550-M1/USA HY28-2600-550-M1/USA
Standard Hydraulic Power Units Installation and Maintenance Manual
D, H, V-Pak and Custom Power Units
Standard Hydraulic Power Units Installation and Maintenance Manual
D, H, V-Pak and Custom Power Units
19
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Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Parts List Parts List
H-Pak Accessories Parts List
Option Description Part Number Filter Element
ARear mt heat ex RM-08-4-2
Bracket 875225 (2 pc)
B1 Rear mt heat ex RM-08-1-2
Bracket 875225 (2 pc)
B2 Rear mt heat ex RM-19-94171
Bracket 875225 (2 pc)
CWater/oil heat exch BS-401-A4-O-BR
DWater/oil heat exch BS-701-B6-F-BR
EWater valve 65253
H
Pressure lter (aluminum head) 15P110QBRSKX1 932612Q
Pressure lter (steel head) 15P110QB16690
Manifold 876526 (aluminum)
876526-S (steel)
Gasket 875576-16
JWeld coupling NA
K (10 GAL) Check valve C1020S
K (20 THRU 40 GAL) Check valve DT-750-MOMF-05
LCheck valve C1220S65
NReturn lter 40CN110QEBM2KS164 936708Q
OReturn lter 12AT10CN15MMH 921999
Gage, lter 876544
R1
Switch housing w/cover 876620
Float switch 876782-01
Gasket 875576-14 (2 pc required)
R2
Switch housing w/cover 876620
Float switch 876782-02
Gasket 875576-14 (2 pc required)
H-Pak Pressure Tank Connections
Option Subplate/Manufacturer
ID Number Relief Valve Gasket
O876305 (aluminum)
See relief valve
chart
875576-05
876305-S (steel)
S3 876378 (aluminum) 875576-04
876378-S (steel)
S5 876305 (aluminum) 875576-05
876305-S (steel)
M33 AD03P032S/C 875576-04
M35 AD03P052S/C
M53 AD05P032S/C 875576-05
M55 AD05P052S/C
H-Pak Relief Valve Part Numbers
Flow HP Option* Relief Valve
0.9 to 3.2 U, T RAH101S20
DG, DK, L, M RAH101S30
4.5 to 9.6 U, T, DG, DK RAH101S20
L, M, N, P, S RAH101S30
*STD or dual rated.
*STD or dual rated motors are the same frame size
The pressure lter is a standard aluminum 15P lter. For high pressure/high fatigue applications
(above 2000 psi), an optional steel manifold and special 15P with a steel head is available.
H-Pak Bell Housing Gasket & Coupling Part Numbers
Flow/HP
Combinations
HP* Flow Gasket Number Motor Coupling Pump Coupling Insert
U,T, DG 0.9 to 2.7 875577-01 L-075 5/8X3/16 L-075 1/2X1/8 L-075U
3.2 to 9.6 L-100 5/8X3/16 L-100 5/8X5/32 L-100
DK, L, DL 0.9 to 2.7
875577-02
68514411518 876975 68514411499
3.2 to 9.6 L-100 1-1/8X1/4 L-100 5/8X5/32 L-100
M, DM, N, DN 3.2 to 9.6 L-100 1-3/8X5/16 L-100 5/8X5/32 L-100U
P, DP, S, DS 4.5 to 9.6 M300 1-5/8X3/8 M300 5/8X5/32 370N
H Pak Motor Chart
Option (HP) Voltage/Frequency Ratings Motor Part Number
U1 (1/2) 115/208-230 1Ph 60Hz 875054-02
T1 (1) 115/230-230 1Ph 60Hz 875054-07
T3 (1) 208-230/460 3Ph 60Hz 875054-14
DG (2) 208-230/460 3Ph 60Hz | 190/380 50Hz 133-60021-0
DK (3) 208-230/460 3Ph 60Hz | 190/380 50Hz 133-60022-0
L (5) 208-230/460 3Ph 60Hz 875054-21
DL (5) 208-230/460 3Ph 60Hz | 190/380 50Hz 133-60023-0
M (7.5) 208-230/460 3Ph 60Hz 875054-22
DM (7.5) 208-230/460 3Ph 60Hz | 190/380 50Hz 133-60024-0
N (10) 208-230/460 3Ph 60Hz 875054-23
DN (10) 208-230/460 3Ph 60Hz | 190/380 50Hz 133-60025-0
P (15) 208-230/460 3Ph 60Hz 875054-24
DP (15) 208-230/460 3Ph 60Hz | 190/380 50Hz 133-60026-0
S (20) 208-230/460 3Ph 60Hz 875054-25
DS (20) 208-230/460 3Ph 60Hz | 190/380 50Hz 133-60027-0

HY28-2600-550-M1/USA HY28-2600-550-M1/USA
Standard Hydraulic Power Units Installation and Maintenance Manual
D, H, V-Pak and Custom Power Units
Standard Hydraulic Power Units Installation and Maintenance Manual
D, H, V-Pak and Custom Power Units
21
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Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Parts List Parts List
V-Pak Parts List
V-Pak parts list is for standard units, design series 11,
with directional valve information excluded. If your unit
is a dierent design series, the form, t and function of
replacement parts may not match your parts.
V-Pak (V1-V4) Parts List – Design Series 11
Description Part Number Notes
5" Level gage 875033-05 10 & 20 Gal
10" Level gage 875033-10 30 & 40 Gal
Filler breather 875034
Pressure gage 875053-**** **** = Max pressure on gage
U-shaped tank edge rubr 875041-72 10 Gal tank, 72" long, trim to t
U-shaped tank edge rubr 875041-78 20-40 Gal tank, 78" long, trim to t
Needle valve (gage) N400S
V-Pak Pump And Suction Strainer Part Numbers
Pump Flow Option Pump Suction Strainer
Up to 7GPM* -PVP1630R2VM12*
875035-10Up to 7GPM* APVP1630R2VA12*
Up to 7GPM HSee motor chart
8 to 15 GPM* -PVP3336R2VM21*
875035-208 to 15 GPM* APVP3336R2VA21*
8 to 15 GPM HSee motor chart
* Important: Specify ow rate to match original power unit model code. “V” compensator has no local pressure setting.
Compensator Options
Option Block Relief Gasket 2-Way Valve Coil P08-2
Omit 876488 (aluminum) (1 pc) 205745N-25 875576-13 N/A N/A No
876488-S (steel)
B, BJ 876549 (aluminum) (1 pc) 205745N-25
875576-15
(1 pc) DSL081NRM (B) CCP115D Yes
876549-S (steel) (BJ) CCP024D
C, CJ 876549 (aluminum) (2 pc) 205745N-25 (1 pc) DSL081NRM (C) CCP115D Yes
876549-S (steel) (CJ) CCP024D
D, DJ 876549 (aluminum) (2 pc) 205745N-25 (2 pc) DSL081NRM (D) CCP115D No
876549-S (steel) (DJ) CCP024D
F876377 Cover plate 875576-13 N/A
V-Pak Motor/Pump HP Chart
Option (HP) Motor Part Number 7 GPM Pump with H Option (HP Limiting) 1.5 GPM Pump with H Option (HP Limiting)
hvPump Number ^ Pressure Set (PSI) Pump Number ^ Pressure Set (PSI)
DG (2) 133-60021-0
PVP1630R2VH12 ^
1600
N/A
DK (3) 133-60022-0 2200
L (5) 875054-21
3000 PSI
DL (5) 133-60023-0
M (7.5) 875054-22
PVP3336R2VH21 ^
2200
DM (7.5) 133-60024-0 2700
N (10) 875054-23
3000
DN (10) 133-60025-0
P (15) 875054-24
DP (15) 133-60026-0
S (20) 875054-25
DS (20) 133-60027-0
^Important: specify the hp setting, rpm and pressure setting shown above to match your system. In most cases hp limited pumps are set
at max volume.
Example: Power unit: V2H7DK Replacement pump =“PVP1630R2VH12 Set for 3 HP @ 1800 RPM, minimum pressure 2200 PSI.
2200 PSI is NOT the compensator setting, the remote block on the power unit top plate will be the limiting pressure device.
The 3 HP motor is no longer available in a 56C frame. It is an 182TC frame design series 11 and beyond.
* See H-Pak motor chart for voltage ratings.
Gear pumps, lters and valves should be purchased from
their respective source Parker Divisions. Parts unique to
the power unit (variable piston pumps, gaskets, special
manifolds, etc.) should be purchased from Parker’s
Hydraulic Pump and Power Systems Division.
Example: Power unit V3A13Mm
Replacement pump =“PVP3336R2VA21 set at 13 GPM @ 1800 RPM”
The remote compensator on the tank top controls the pump’s pressure after it is installed in the power unit and the compensator control line is
reconnected to the remote block.
V-Pak Bell Housing Gasket & Coupling Part Numbers
Flow/HP
Combinations
HP Flow Gasket Number Motor Coupling Pump Coupling Insert
2 (DG)
2-7 GPM 875577-01 L-075 5/8X3/16 L-075 3/4X3/16 L-075U
8-15 GPM NA N/A
3 (DK) 2-7 GPM 875577-02 L-100 1-1/8X1/4 L-100 3/4X3/16 L-100
8-15 GPM C820004 L-100 1-1/8X1/4 L-100 7/8X1/4 L-100
5 (L) 2-7 GPM 875577-02 L-100 1-1/8X1/4 L-100 3/4X3/16 L-100
8-15 GPM C820004 L-100 1-1/8X1/4 L-100 7/8X1/4 L-100
7.5 (M) 2-7 GPM 875577-02 L-100 1-3/8X5/16 L-100 3/4X3/16 L-100
8-15 GPM C820004 M300 1-3/8X5/16 M300 7/8X1/4 370N
10 (N) 2-7 GPM 875577-02 L-100 1-3/8X5/16 L-100 3/4X3/16 L-100
8-15 GPM C820004 M300 1-3/8X5/16 M300 7/8X1/4 370N
15 (P) 2-7 GPM 875577-02 M300 1-5/8X3/8 M300 3/4X3/16 370N
8-15 GPM C820004 M400 1-5/8X3/8 M400 7/8X1/4 470N
20 (S) 2-7 GPM 875577-02 M300 1-5/8X3/8 M300 3/4X3/16 370N
8-15 GPM C820004 M400 1-5/8X3/8 M400 7/8X1/4 470N

HY28-2600-550-M1/USA HY28-2600-550-M1/USA
Standard Hydraulic Power Units Installation and Maintenance Manual
D, H, V-Pak and Custom Power Units
Standard Hydraulic Power Units Installation and Maintenance Manual
D, H, V-Pak and Custom Power Units
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22
Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Parts List Parts List
V-Pak Accessories Parts List
Option Description Part Number Filter Element
ARear mt heat exch RM-08-4-2
Bracket 875225 (2 pc)
B1 Rear mt heat exch RM-08-1-2
Bracket 875225 (2 pc)
B2 Rear mt heat exch RM-19-94171
Bracket 875225 (2 PCS)
CWater/oil heat exch BS-401-A4-O-BR
DWater/oil heat exch BS-701-B6-F-BR
EWater valve 65253
H
Pressure lter (aluminum head) 15P110QBRSKX1 932612Q
Pressure lter (steel head) 15P110QB16690
Manifold 876526 (aluminum)
876526-S (steel)
Gasket 875576-16
JWeld coupling NA
K (10 GAL) Check valve C1020S
K (20 THRU 40 GAL) Check valve DT-750-MOMF-05
LCheck valve C1220S65
NReturn lter 40CN110QEBM2KS164 936708Q
OReturn lter 12AT10CN15MMH 921999
Gage, lter 876544
R1
Switch housing w/cover 876620
Float switch 876782-01
Gasket 875576-14 (2 pc required)
R2
Switch housing w/cover 876620
Float switch 876782-02
Gasket 875576-14 (2 pc required)
V-8 (Low Prole) Parts List
V-8 (low prole) parts list is for standard units, design
series 13, with directional valve information excluded.
If your unit is a dierent design series, the form, t and
function of replacement parts may not match your parts.
Gear pumps, lters and valves should be purchased from
their respective source Parker Divisions. Parts unique to
the power unit (variable piston pumps, gaskets, special
manifolds, etc.) should be purchased from Parker’s
Hydraulic Pump and Power Systems Division.
V-8 Low Prole Parts List – Design Series 13
Universal Parts Part Number
10" level gage 875033-10
Filler breather 875034
Pressure gage 875053-**** **** - Max pressure on gage
Needle valve (gage) N400S
Clean-out cover 5087
Gasket, temp/level 875576-14
U-shaped tank edge rubber 875041-100 100" long, trim to t
Remote comp hose F381-0606040404-35"
Compensator Options
Option Block Relief Gasket 2-Way Valve Coil
Omit 876488 (aluminum) (1 pc) 205745N-25 875576-13 N/A N/A
B, BJ 876549 (aliminum) (1 pc) 205745N-25
875576-15
(1 pc) DSL081NRM (B) CCP115D
(BJ) CCP024D
C, CJ 876549 (aliminum) (2 pc) 205745N-25 (1 pc) DSL081NRM (C) CCP115D
(CJ) CCP024D
D, DJ 876549 (aliminum) (2 pc) 205745N-25 (2 pcs) DSL081NRM (D) CCP115D
(DJ) CCP024D
E876377 Cover plate N/A 875576-13 N/A
V8 Low Prole Pump Part Number Chart
Pump Flow Pump Control Pump (If no air cooling or
option A, B)
Pump (If air cooling
option C) Suction Strainer
9 to 15 GPM* -PVP33363R2M21* PVP33363R26A4M21*
875035-209 to 15 GPM* APVP33363R2A21* PVP33363R26A4A21*
9 to 15 GPM HConsult factory Consult factory
16 to 23 GPM* -PVP48363R2M11* PVP48363R26A4M11*
875035-3016 to 23 GPM* APVP48363R2A11* PVP48363R26A4A11*
16 to 23 GPM HConsult factory Consult factory
23 to 36 GPM* -P2075RXXC5C25PA00N00S1A1U^ P2075RXXC5C25PA00N00A1A1U^
875035-5023 to 36 GPM* AP2075RXXC5C25LA10N00S1A1U^ P2075RXXC5C25LA10N00A1A1U^
23 to 36 GPM HConsult factory Consult factory
*Important: specify ow rate & rpm to match original power unit model code. For example: power unit = V820PM53 The replacement pump
would be PVP48363R2M11, specify the volume stop be set at 20 gpm @ 1800 rpm, pressure compensator set at 3600 PSI.
^Important: the P2’s ow rate is called out in the model code of the pump as a percentage of full ow (36 gpm).
For example: Power unit = V827RM82 27/36 = 75%, so the replacement pump model code is P2075R75C5C25PA00N00S1A1U.
The pressure lter is a standard aluminum 15P lter. For high pressure/high fatigue applications (above 2000 psi), an optional steel manifold and
special 15P with a steel head is available.
V-Pak Pressure Tank Connections
Option Subplate/Manufacturer
ID Number Relief Valve Gasket
O876305 (aluminum)
RAH101S50
875576-05
876305-S (steel)
S3 876378 (aluminum) 875576-04
S5 876305 (aluminum) 875576-05
876305-S (steel)
M33 AD03P032S/C 875576-04
M35 AD03P052S/C
M53 AD05P033S/C 875576-05
M55 AD05P053S/C

HY28-2600-550-M1/USA HY28-2600-550-M1/USA
Standard Hydraulic Power Units Installation and Maintenance Manual
D, H, V-Pak and Custom Power Units
Standard Hydraulic Power Units Installation and Maintenance Manual
D, H, V-Pak and Custom Power Units
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Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Parts List Parts List
V8 Low Prole Subplate/Manifold, Relief Valve/Gasket Numbers
Option Subplate/Manifold Number Relief Valve Gasket
OMIT 877544 RAH161S50 875576-09
S5 876305 (Al)
RAH101S50
875576-05
M53 AD05P033S/C 875576-05
M55 AD05P053S/C
M82 AD08P025S/C 875576-12
V-8 Low Prole Motor Part Numbers
Option (HP) Voltage/Frequency Ratings Motor Part Number
M (7.5) 208-230/460 3Ph 60Hz 875054-22
DM (7.5) 208-230/460 3Ph 60Hz | 190/380 50Hz 133-60024-0
N (10) 208-230/460 3Ph 60Hz 875054-23
DN (10) 208-230/460 3Ph 60Hz | 190/380 50Hz 133-60025-0
P (15) 208-230/460 3Ph 60Hz 875054-24
DP (15) 208-230/460 3Ph 60Hz | 190/380 50Hz 133-60026-0
S (20) 208-230/460 3Ph 60Hz 875054-25
DS (20) 208-230/460 3Ph 60Hz | 190/380 50Hz 133-60027-0
Q (25) 208-230/460 3Ph 60Hz 875054-26
DQ (25) 208-230/460 3Ph 60Hz | 190/380 50Hz 133-60028-0
R (30) 208-230/460 3Ph 60Hz 875054-27
DR (30) 208-230/460 3Ph 60Hz | 190/380 50Hz 133-60029-0
V (40) 208-230/460 3Ph 60Hz 875054-28
DV (40) 208-230/460 3Ph 60Hz | 190/380 50Hz 133-60030-0
V8 Low Prole Bell Housing Gasket and Coupling Part Numbers
HP Flow Gasket Number Motor Coupling Pump Coupling Insert
7.5 (M) 10(N) 9-23 GPM C820004 M300 1-3/8X5/16 M300 7/8X1/4 370U
24-36 GPM C820004 M400 1-3/8X5/16 M400 1-1/4X5/16 470N
15 (P) 20 (S) 9-23 GPM C820004 M400 1-5/8X3/8 M400 7/8X1/4 470N
24-36 GPM C820004 M400 1-5/8X3/8 M400 1-1/4X5/16
25 (Q) 9-23 GPM
N/A
M400 1-7/8X1/2 M400 7/8X1/4 470N
24-36 GPM M400 1-7/8X1/2 M400 1-1/4X5/16
30 (R) 9-23 GPM M400 1-7/8X1/2 M400 7/8X1/4 470U
24-36 GPM M400 1-7/8X1/2 M400 1-1/4X5/16
40 (V) 9-23 GPM M500 2-1/8X1/2 M500 7/8X1/4 570N
24-36 GPM M500 2-1/8X1/2 M500 1-1/4X5/16
V8 Low Prole Accessories Parts List
Option Description Part Number Filter Element
A
Rear mt heat ex RM-08-2-2
Bracket 875225 (2 pc)
Suction strainer 875035-10
Gear pump 334-9111-061
B
Rear mt heat exch RM-19-2-2
Bracket 875225 (2 pc)
Suction strainer 875035-10
Gear pump 334-9111-061
C
Heat exchanger AOC-22-2-1PH
Gear pump 334-9111-058
Suction strainer 875035-10
Filter 40CN205QEBM2GS244 936711Q
EWater/oil heat exch EKS-708-T
FWater valve 65253
HPressure lter 30P210QBM2KS161 932630Q
JWeld coupling N/A
KCheck valve 493-1601-2
LCheck valve C2020S65
NReturn lter 40CN210QEBM2KS244 936601Q
R1
Switch housing w/cover 876620
Float switch 876782-01
Gasket 875576-14 (2 pc required)
R2
Switch housing w/cover 876620
Float switch 876782-02
Gasket 875576-14 (2 pc required)

HY28-2600-550-M1/USA HY28-2600-550-M1/USA
Standard Hydraulic Power Units Installation and Maintenance Manual
D, H, V-Pak and Custom Power Units
Standard Hydraulic Power Units Installation and Maintenance Manual
D, H, V-Pak and Custom Power Units
27
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Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Troubleshooting Troubleshooting
Troubleshooting
System Fails to Generate Flow/Pressure
1. Add oil to the unit, ll until the oil is at the top of
the level gage glass. Use a petroleum base uid
per HF-0 or HF-1. The uid should have anti-rust,
anti-foam properties and be designed for operating
under high pressure.
2. Motor rotation incorrect, verify and change
if necessary.
3. Pump hasn’t primed. Bleed the system and retry.
4. No resistance to ow. Pumps generate ow not
pressure. Pressure is generated by the resistance
to ow. If there is an open center directional valve
or other path that connects the pressure line to
tank, there will be no pressure.
5. Unloading valve not activated. Verify voltage to the
solenoid, preferably with the solenoid connected.
An undersized power supply can appear to be OK
but then droop when loaded by the solenoid.
6. Failed or incorrectly adjusted relief valve.
Contamination can plug the internal pilot
pressure of a relief valve, causing it to fail in the
open position.
7. Pump/motor coupling loose or broken. Normally
the motor will stop within a second or two of losing
power. If it winds down over several seconds it is
not connected to the pump shaft.
8. Loose or disconnected inlet line.
9. Failed pump. In the case of a variable volume
pump, additionally the remote compensator
and main compensator should be inspected.
Contamination can cause the pump to de-stroke
at minimum pressure. Checking the remote
compensator should be done rst because
it is mounted on the power unit top plate
(easy access).
Motor Fails to Start When Drive Is Commanded
to Do So
1. 24 VDC signal not present at required pin(s). The
exact control option determines which inputs
cause the drive to run the motor. In most cases,
at least one input (DIN1) needs to be held high
to enable the drive. As of March 2017, all drives
shipped with factory-installed software require
DIN1 and DIN2 to be held high to function. DIN1 is
a master enable; DIN2 could be tied to the temp/
level switch (if equipped) or a NC stop button that
opens when pressed. In addition to these two
discrete inputs, there are analog inputs that are
used for the “V” and “I” options.access).
2. Make sure the DC common of the remote 24 VDC
signal source is tied to the “(CM) 0VDC” terminal of
the AC10. This is necessary so both devices have
the same zero-volt reference.
Excessive Electrical Interference or EMI
1. Broken or improper shield connection of the cable
between the motor and the drive. Loose or missing
ground connection at power connection.
DCP (Inverter) Specic Troubleshooting Items
Motor Slows Down Unexpectedly or Stalls
1. This is a sign the drive is undersized. The AC10
can handle 150% of its rating for a few seconds.
Starting torque can often be more than this,
especially with variable volume pumps. If the
drive has trouble starting, an unloading valve or
decrease in pressure may be required until the
motor is up to speed.
2. Ampacity of the wires feeding the drive is too low.
Make sure the wires are properly sized. The longer
the run, the bigger the wire needs to be for a given
amp rating to avoid voltage droop. If the voltage to
the drive droops too much, current rise and motor
slip will lead to a complete breakdown of motor
speed.
System Flow and/or Pressure Inadequate or Erratic
1. Loose inlet connection or dirty inlet strainer.
2. Incorrectly adjusted relief valve.Pump hasn’t
primed. Bleed the system and retry.
3. If a variable pump is being used, make sure the
main relief and pump compensator are not set too
closely together. A minimum separation of 250 psi
is recommended.
4. If ow and pressure are steady but weak, verify
the motor is properly wired to match the incoming
voltage and that all three phases have power.
Running on two phases or being wired for the
wrong voltage will cause the motor to run slow
and will result in motor damage.

HY28-2600-550-M1/USA HY28-2600-550-M1/USA
Standard Hydraulic Power Units Installation and Maintenance Manual
D, H, V-Pak and Custom Power Units
Standard Hydraulic Power Units Installation and Maintenance Manual
D, H, V-Pak and Custom Power Units
29
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Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Power Unit Weights
Power Unit Weights
Since there are so many combinations of options,
listing an exact weight for every model code is not
practical. The following chart will provide estimates
based on tank size and horsepower. Combine the
tank size and motor horsepower to come up with an
average total weight, without oil.
Notes
Tank Size Approximate Weight Less Motor
5 Gallon 70 lbs.
10 Gallon 106 lbs.
20 Gallon 122 lbs.
30 Gallon 126 lbs.
40 Gallon 130 lbs.
55 Gallon 260 lbs.
75 Gallon 313 lbs.
95 Gallon 365 lbs.
Motor HP Approximate Weight
1/4 20 lbs.
1/2 20 lbs.
3/4 40 lbs.
140 lbs.
240 lbs.
365 lbs.
575 lbs.
7-1/2 100 lbs.
10 120 lbs.
15 170 lbs.
20 200 lbs.
25 370 lbs.
30 440 lbs.
40 505 lbs.

HY28-2600-550-M1/USA
Standard Hydraulic Power Units Installation and Maintenance Manual
D, H, V-Pak and Custom Power Units
Standard Hydraulic Power Units Installation and Maintenance Manual
D, H, V-Pak and Custom Power Units
30
Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
United States
Notes Oer of Sale
31
HY28-2600-550-XXX

HY28-2600-5500-M1/USA 5/2019© 2019 Parker Hannin Corporation
Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
14249 Industrial Pkwy.
Marysville, OH 43040
phone [phone]
fax [phone]
www.parker.com/hps