Accudyne Industries Milton Roy MILROYAL C Instruction manual

MILROYAL®C DRIVE
IOM Manual
Manual No : 53939
Rev. : 00
Rev. Date : 11/2015

iInstallation, Operations & Maintenance Manual
PRECAUTIONS
The following precautions should be taken when working with metering pumps.
Please read this section carefully prior to installation.
Protective Clothing
ALWAYS wear protective clothing, face shield, safety glasses and gloves when working on or
near your metering pump. Additional precautions should be taken depending on the solution
being pumped. Refer to Safety Data Sheets for the solution being pumped.
Hearing Protection
It is recommended that hearing protection be used if the pump is in an environment where the
time - weighted average sound level (TWA) of 85 decibels is exceeded. (as measured on the
A scale - slow response)
Electrical Safety
• Remove power and ensure that it remains OFF while maintaining pump.
• DO NOT FORGET TO CONNECT THE PUMP TO EARTH / GROUND.
• Electric protection of the motor (Thermal protection or by means of fuses) is to correspond
to the rated current indicated on the motor data plate.
Liquid Compatibility
Verify if the materials of construction of the wetted components of your pump are
recommended for the solution (chemical) to be pumped.
Pumps Water “Primed”
All pumps are tested with water at the factory. If your process solution is not compatible with
water, ush the Pump Head Assembly with an appropriate solution before introducing the
process solution.
Plumbing and Electrical Connections
Always adhere to your local plumbing and electrical codes.
Line Depressurization
To reduce the risk of chemical contact during disassembly or maintenance, the suction and
discharge lines should be depressurized before servicing.
Over Pressure Protection
To ensure safe operation of the system it is recommended that some type of safety /
pressure-relief valve be installed to protect the piping and other system components from
damage due to over-pressure.

ii Installation, Operations & Maintenance Manual
Lifting
This manual should be used as a guide only - Follow your company’s recommended lifting
procedures. It is not intended to replace or take precedence over recommendations, policies
and procedures judged as safe due to the local environment than what is contained herein.
Use lifting equipment that is rated for the weight of the equipment to be lifted.

iiiInstallation, Operations & Maintenance Manual
TABLE OF CONTENTS
SECTION 1 - GENERAL DESCRIPTION ....................................................... 2
1.1 INTRODUCTION ................................................................. 2
1.2 MODEL CODE / PUMP IDENTIFICATION.............................................. 2
1.3 PRINCIPLE OF OPERATION ....................................................... 2
1.4 SAFETY PRECAUTIONS........................................................... 4
1.5 SPECIFICATIONS ................................................................ 4
SECTION 2 - INSTALLATION ................................................................ 5
2.1 UNPACKING / INSPECTION........................................................ 5
2.2 STORAGE ...................................................................... 5
2.2.1 Short Term Storage (Less than 6 Months) ............................................ 5
2.2.2 Long Term Storage(Longer than 6 Months) ........................................... 5
2.2.3 Pump Drive and Gearboxes ....................................................... 5
2.2.4 Pump Liquid Ends............................................................... 5
2.2.5 Pneumatic, Electrical and Electronic Equipment ....................................... 6
2.3 SAFETY PRECAUTIONS .......................................................... 6
2.4 PUMP MOUNTING / LOCATION..................................................... 6
2.5 PIPING ....................................................................... 7
2.5.1 General....................................................................... 7
2.5.2 Suction Piping.................................................................. 7
2.5.3 Discharge Piping ............................................................... 8
2.6 VENTED RISERS ................................................................ 9
2.7 PULSATION DAMPENERS ......................................................... 9
2.8 BACK PRESSURE VALVES ........................................................ 9
2.9 SAFETY VALVES................................................................ 10
2.10 CHECK VALVES ............................................................... 10
2.11 SHUT-OFF VALVES ............................................................. 11
2.12 SERVICE CONNECTIONS ....................................................... 11
2.12.1 Pump Drive .................................................................. 11
2.12.2 Stuffing Box.................................................................. 12
2.12.3 Drains ...................................................................... 12
2.12.4 Auxiliary (Accessory) Equipment ................................................. 12
SECTION 3 - OPERATION ................................................................. 13
3.1 INITIAL START-UP............................................................... 13
3.2 OIL SPECIFICATIONS ........................................................... 13
3.3 INITIAL ADJUSTMENT ........................................................... 13
3.3.1 Micrometer Capacity Control ..................................................... 13
3.3.2 Electric Capacity Control ........................................................ 13
3.3.3 Pneumatic Capacity Calibration ................................................... 13
3.3.4 Speed Capacity Control ......................................................... 13
3.3.5 Capacity Calibration ............................................................ 14

iv Installation, Operations & Maintenance Manual
3.4 FILLING PUMP SYSTEM ......................................................... 14
3.5 PREVENTATIVE MAINTENANCE................................................... 14
3.5.1 Drive ...................................................................... 14
3.5.2 Motor ...................................................................... 14
3.5.3 Check Valves ................................................................ 14
SECTION 4 - MAINTENANCE............................................................... 15
4.1 SPARE PARTS ................................................................. 15
4.2 RETURNING UNITS TO THE FACTORY ............................................. 15
4.3 DISASSEMBLY ................................................................. 15
4.3.1 Pump Drive ................................................................... 15
4.3.2 Crosshead Removal ............................................................ 16
4.3.3 Gear Housing Removal ......................................................... 16
4.4 REASSEMBLY.................................................................. 17
4.4.1 Pump Drive ................................................................... 17
4.4.2 Crosshead ................................................................... 18
SECTION 5 - TROUBLESHOOTING GUIDE .................................................... 19
SECTION 6 - PARTS ...................................................................... 24
6.1 GENERAL ..................................................................... 24
6.2 ILLUSTRATED PARTS LIST ....................................................... 24
6.3 MILROYAL®C DRIVE. ............................................................ 27
LIST OF ILLUSTRATIONS
FIGURE 1. Milroyal®C Metering Pump .......................................................... 1
FIGURE 2. Capacity Adjustment .............................................................. 2
FIGURE 3. Packed Plunger Liquid End (Shown with optional oiler) (See manual 54270) ................... 3
FIGURE 4. HPD Liquid End (See manual 54146) ................................................. 4
FIGURE 5. Float Box ....................................................................... 8
FIGURE 6. Vented Riser..................................................................... 9
FIGURE 7. Safety and Back Pressure Valve ..................................................... 10
FIGURE 8. Recommended Valve Locations ..................................................... 11
FIGURE 9. Pump Nameplate ................................................................ 15
FIGURE 10. Pump Drive Parts ............................................................... 22
FIGURE 11. Special Tools ................................................................... 23
FIGURE 12. Drive End View Drawing (102-2285-000) (Sheet 1 of 2).................................. 25
FIGURE 12. Drive Side and Top Views Drawing (102-2285-000) (Sheet 2 of 2) ......................... 26

1Installation, Operations & Maintenance Manual
Figure 1. Milroyal®C Metering Pump.

2Installation, Operations & Maintenance Manual
1.1 INTRODUCTION
The Milroyal®C is a reciprocating positive-
displacement controlled-volume pump designed to
move specic volumes of liquid against a positive
pressure differential between the pump suction
and the pump discharge. The delivered volume is
controllable within one percent of setting.
The pump consists of three major components:
(1) a drive unit, (2) a reciprocating plunger, and (3)
a liquid end. Pump delivery is a function of drive
speed, plunger stroke length, and plunger diameter.
In addition, delivered volume for a given pump can
be varied by mechanical (micrometer hand knob)
or (optional) electrical or pneumatic adjustment
of plunger stroke length. Pump drives may be
tted with HPD (High Performance Diaphragm,
Manual 54146) as well as several styles of PP
(Packed Plunger, Manual 54270) liquid ends (See
Figures 3 and 4). This manual will concentrate on
the mechanically adjusted drive unit only.
1.2 MODEL CODE / PUMPIDENTIFICATION
Milroyal®C pumps manufactured during and
after 1995 were given a new model code which
completely defines the material and options
selected. The rst digits indicate the frame size,
followed by the “options” code. See manual 54146
for HPD model number breakdown and 54270 for
PP model number breakdown.
1.3 PRINCIPLE OF OPERATION
The drive unit moves the pump plunger to draw
liquid into the liquid end on the suction stroke
and to expel the liquid on the subsequent
discharge stroke. Accurate flow control is
achievable only if the discharge line pressure
(discharge head) is greater than the suction line
pressure (suction head). For aid in determining
acceptable piping performance, please refer to
Milton Roy’s NPSH calculator, available on line at
www.miltonroy.com.
The unique Milroyal®C pump drive mechanism
operates on a patented polar crank principle.
Essentially, a crank driven by a worm gear rotates
on a variable plane. As the crank plane is changed
from vertical, a reciprocating motion results from
the crank connection to the plunger. Pump stroke
length is increased from zero to maximum by
adjusting the slope of the crank plane from vertical.
(See Figure 2.)
Figure 2. Capacity Adjustment
SECTION 1 - GENERAL DESCRIPTION

3Installation, Operations & Maintenance Manual
SECTION 1 - GENERAL DESCRIPTION
As the plunger reciprocates in the liquid end,
the pumped liquid is alternately drawn into and
discharged from the liquid end. Each suction
(rearward) stroke of the pump plunger creates
a negative pressure in the displacement chamber.
The pressure of the liquid in the suction line
unseats the suction ball-checks and liquid ows
into the displacement chamber. On the discharge
stroke, the plunger moves forward and pressurizes
the liquid which unseats the discharge ball-checks
to ow out the discharge port. On each suction
stroke, the discharge ball-checks are seated, and
on each discharge stroke, the suction ball-checks
are seated (pressure in pump head is greater than
suction line pressure). This mode of operation
prevents back ow and ensures liquid movement
from the suction port, through the liquid end, and
out the discharge port.
In packed plunger liquid ends, the plunger contacts
the process liquid, while diaphragm liquid ends
isolate the process liquid from the pump plunger.
In the latter designs, the plunger displaces
hydraulic uid which moves a diaphragm in contact
with the process liquid, forcing the process liquid
through the liquid end. Liquid ends are covered in
separate instruction manuals.
Figure 3. Packed Plunger Liquid End
(See manual 54270)

4Installation, Operations & Maintenance Manual
1.4 SAFETY PRECAUTIONS
When installing, operating, and maintaining the
Milroyal®C keep safety considerations foremost.
Use proper tools, protective clothing, and eye
protection when working on the equipment.
Install the equipment with a view toward ensuring
safe operation. Follow the instructions in this
manual and take additional safety measures
appropriate to the liquid being pumped.
Be extremely careful in the presence of hazardous
substances (e.g., corrosive, toxins, solvents, acids,
caustics, ammables, etc.).
1.5 SPECIFICATIONS
Detailed specications for this pump are listed
on the pump Data Sheet. The sheet can be
downloaded at www.miltonroy.com.
Figure 4. HPD Liquid End (See manual 54146)
The following is a list of manuals that may be
required to maintain your Milroyal®C pump:
Title Document Number
Disc Diaphragm Liquid
End 54145
Milroyal®C Pneumatic
Capacity Control 54269
Double Diaphragm Leak
Detector 54148
Metallic Diaphragm
Liquid End 54151
Electronic Capacity
Control 53870
The manuals can be downloaded on the internet
at www.miltonroy.com.
SECTION 1 - GENERAL DESCRIPTION

5Installation, Operations & Maintenance Manual
2.1 UNPACKING / INSPECTION
Pumps are shipped Free on Board (FOB) factory
or representative warehouse and the title passes to
the customer when the carrier signs for receipt of
the pump. In the event that damages occur during
shipment, it is the responsibility of the customer to
notify the carrier immediately and to le a damage
claim.
Carefully examine the shipping crate upon receipt
from the carrier to be sure there is no obvious
damage to the contents. Open the crate carefully
so accessory items fastened to the inside of the
crate will not be damaged or lost. Examine all
material inside the crate and check against the
packing list to be sure that all items are accounted
for and intact.
2.2 STORAGE
2.2.1 Short Term Storage (Less than 6 Months)
It is preferable to store the material under a shelter
in its original package to protect it from adverse
weather conditions. In condensing atmospheres,
follow the long term storage procedure.
2.2.2 Long Term Storage
(Longer than 6 Months)
The primary consideration in storage of pump
equipment is to prevent corrosion of external and
internal components. This corrosion is caused
by natural circulation of air as temperature of the
surroundings change from day to night, day to day,
and from season to season. It is not practical to
prevent this circulation which carries water vapor
and other corrosive gases, so it is necessary to
protect internal and external surfaces from their
effects to the greatest extent possible.
When the instructions given in this section are
completed, the equipment is to be stored in a
shelter; protected from direct exposure to weather.
The prepared equipment should be covered with a
plastic sheet or a tarpaulin, but in a manner which
will allow air circulation and prevent capture of
moisture. Equipment should be stored 12 inch or
more above the ground.
If equipment is to be shipped directly from Milton
Roy into long term storage, contact Milton Roy to
arrange for factory preparation.
2.2.3 Pump Drive and Gearboxes
A. Flood the gearbox compartments with a high
grade Lubricating Oil / Rust Preventative such as
Mobil Oil Corporation product “Mobilarma 524”.
Fill the compartment completely to minimize
air space and water vapor condensation.
After storage, drain this material and rell the
equipment with the recommended running uids
and lubricants for equipment commissioning.
B. Remove drive motors and mounting adapters,
and brush all unpainted metal surfaces with
multipurpose grease (NLGI grade 2 or 3).
Store these unattached.
2.2.4 Pump Liquid Ends
Flood the front compartment of the pump housing
(if the model has a front compartment) with a high
grade Lubricating Oil / Rust Preventative such as
Mobil Oil Corporation product “Mobilarma 524”.
1. If the pump has a diaphragm style liquid end,
fill the pump-housing compartment all the
way to minimize airspace and water vapor
condensation.
2. If the pump has a packed plunger style liquid
end, holes in the chamber for gland tightening
bolts will leak the oil, so ll the chamber only to
the bolt centerline. Brush the remaining exposed
metal parts thoroughly with general purpose
grease (NLGI grade 2 or 3).
SECTION 2 - INSTALLATION

6Installation, Operations & Maintenance Manual
3. Most of the liquid ends themselves are
constructed of inherently corrosion resistant
materials and require no applied corrosion
inhibitor. If they are NOT naturally resistant
(test the threaded or anged inlet and outlet
connections - if they have little or no magnetic
property, they are resistant) they should be ush
lled with a corrosion inhibiting and non-freezing
liquid which is compatible with the nal pumped
process chemical. Flush and ll with inhibitors
such as “Mobilarma 524” or with a commercial
automotive antifreeze coolant. The pump head
contains one way check valves, so ush in a
direction into the suction (bottom) connection,
and out the discharge (top) connection.
Cap or plug all openings to capture the inhibiting
uid, and to prevent animals and insects from
building nests.
2.2.5 Pneumatic, Electrical and Electronic
Equipment
Motors should be prepared in the manner
prescribed by their manufacturer. If information
is not available, dismount and store motors as
indicated in paragraph below.
For all pneumatic and electrical equipment,
place packets of Vapor Phase Corrosion Inhibitor
(VPCI) inside of the enclosure, then place the
entire enclosure, with additional packets, inside
a plastic bag, and seal the bag tightly closed.
Contact Milton Roy Service Department for
recommended VPCI materials.
2.3 SAFETY PRECAUTIONS
WHEN INSTALLING, OPERAT-
ING, AND MAINTAINING THE
MILROYAL®C, KEEP SAFETY CONSIDERATIONS FOREMOST.
USE PROPER TOOLS, PROTECTIVE CLOTHING, AND EYE
PROTECTION WHEN WORKING ON THE EQUIPMENT AND IN-
STALL THE EQUIPMENT WITH A VIEW TOWARD ENSURING
SAFE OPERATION. FOLLOW THE INSTRUCTIONS IN THIS
MANUAL AND TAKE ADDITIONAL SAFETY MEASURES AP-
PROPRIATE TO THE LIQUID BEING PUMPED. BE EXTREMELY
CAREFUL IN THE PRESENCE OF HAZARDOUS SUBSTANCES
(E.G., CORROSIVES, TOXINS, SOLVENTS, ACIDS, CAUSTICS,
FLAMMABLES, ETC).
THE PERSONNEL RESPONSIBLE
FOR INSTALLATION, OPERATION
AND MAINTENANCE OF THIS EQUIPMENT MUST BECOME
FULLY ACQUAINTED WITH THE CONTENTS OF THIS MANUAL.
2.4 PUMP MOUNTING / LOCATION
Support the pump firmly in a level position
(shim if necessary) on a solid, vibration-free
foundation, preferably with the base above oor
level to protect if from washdowns and to provide
easier access for service. The pump features
mounting holes to accommodate anchor bolts.
Some Milroyal®pumps are shipped with motors
dismounted. After anchoring pump drive in position,
install motor.
SECTION 2 - INSTALLATION

7Installation, Operations & Maintenance Manual
SECTION 2 - INSTALLATION
2.5 PIPING
2.5.1 General
Never connect rigid pipe to plastic liquid ends;
rather, use exible connections to both suction
and discharge.
Use piping materials that will resist corrosion by
the liquid being pumped. Use care in selecting
materials to avoid galvanic corrosion at pump liquid
end connections.
Use piping heavy enough to withstand maximum
pressures.
Size suction piping to accommodate peak
instantaneous ow. Because of the reciprocating
motion of the pump plunger, pump delivery
follows an approximate sine curve with a peak
instantaneous ow pi (3.14) times the average
ow. Therefore, piping must be designed for a ow
3.14 times the pump capacity; this means that a
pump rated for 88 gallons per hour requires piping
sufcient for 88 gph (333.1 L/hr.) X 3.14 or 276 gph
(1044.7 L/hr.).
Discharge piping may be smaller if a pulsation
dampener is used.
To minimize viscous ow losses, pump viscous
liquids with line up to four sizes larger than the
pump port.
Remove burrs, sharp edges, and debris from inside
piping. Flush and blow out all pipe lines before
making nal connections to pump.
Provide for pipe expansion when hot liquids are
to be pumped. Support piping so that pipe weight
is not placed on the pump. Never spring piping to
make connections.
Piping should be sloped to prevent vapor pockets,
because vapor in the liquid end will cause
inaccurate pump delivery.
When pumping suspended solids (such as slurries),
install plugged crosses at all 90-degree line turns
to permit line cleaning without dismantling piping.
2.5.2 Suction Piping
It is preferable to have the suction of the pump
flooded by locating the liquid end below the
lowest level of the liquid in the supply tank.
Installing a hold-up tower or supply vessel
on the suction line close to the pump can
help ensure a flooded suction line. (Consult
Milton Roy, Flow Control Division for assistance
in such applications).
Avoid negative suction pressure conditions
(suction lift), as such conditions adversely
affect metering accuracy. If such conditions are
unavoidable, contact Milton Roy Flow Control
Division for recommendations.
When pumping a liquid near its boiling point,
provide enough suction head to prevent the liquid
from “ashing” into vapor when it enters the pump
liquid end on the suction stroke.
If possible, use metal or plastic tubing for the
suction line because tubing has a smooth inner
surface and can be formed into long, sweeping
bends to minimize frictional ow losses.
A strainer should be used in the suction line to
prevent foreign particles form entering the liquid
end. This and any other measures which prevent
debris from entering and fouling the ball-checks
will give increased maintenance-free service.
Check strainer frequently to prevent blockage
which could lead to cavitation.
Keep suction piping as short and straight as
possible.
When suction piping is long, and particularly at
stroke speeds above 70 strokes per minute (spm),
piping size should be signicantly larger than the
liquid end suction tting to prevent pump starvation.

8Installation, Operations & Maintenance Manual
If long suction lines are unavoidable, install
a float box (See Figure 5) or auxiliary feed
tank (stand pipe) near the suction side of the pump.
The oat box may be calibrated and used to check
pump capacity by measuring the time required
for pumping a specic quantity of liquid from the
box. In many cases, installing an accumulator
or pulsation dampener at the pump suction
connection will promote ooded suction even when
the suction line is long. Consult Milton Roy Flow
Control Division for details. Suction piping must
be absolutely airtight to ensure accurate pumping.
After installation, test suction piping for leaks with
air and soap solution.
2.5.3 Discharge Piping
Install pipe large enough to prevent excessive
pressure losses on the discharge stroke of the
pump. Maximum pressure at the discharge tting
on the liquid end must be kept at or below the
maximum pressure rating shown on the pump
nameplate.
The pump will not deliver a controlled flow
unless the discharge line pressure is greater
than the suction line pressure. Piping should be
arranged to provide at least 5 psi positive pressure
differential between the discharge side and the
suction side. There are a number of ways to
create an articial discharge pressure, such as by
installing a vented riser or a back pressure valve.
(Please consult Milton Roy Flow Control Division
for recommendations to increase back pressure in
slurry applications.)
When pumping water-treating chemicals directly
into boiler drums, use one liquid end assembly
for each boiler drum, Discharging into a manifold
having the slightest pressure difference between
its several discharge connections can diminish
metering accuracy as the outlet with the lowest
pressure will receive more liquid than the other
outlets.
Figure 5. Float Box
SECTION 2 - INSTALLATION

9Installation, Operations & Maintenance Manual
2.6 VENTED RISERS
A vented riser (Figure 6) is simply a vertical
extension of the discharge pipe into an open tee.
The other side of the tee goes to the process.
Practically maintenance-free, this device prevents
siphoning and reduces pulsations; however,
a clogged or closed line may cause the riser
to overflow. Therefore, substitute a pulsation
dampener and back pressure valve for a vented
riser when pumping hazardous liquids.
Figure 6. Vented Riser
2.7 PULSATION DAMPENERS
(Accumulators, Surge Chambers etc.)
An accumulator, surge chamber, surge suppressor,
or pulsation dampener should be used with the
back pressure valve in the discharge line to
absorb the ow peaks between the pump and
the back pressure valve. Without the pulsation
dampener the valve mechanism will snap
open and closed with the surge from each
pump stroke. The pulsation dampener will allow
the back pressure valve to oscillate about a
partly-closed position, thus minimizing wear on the
valve. Discharge line pulsation dampeners offer the
further advantage of limiting the ow and pressure
variations characteristic of this performance
and may reduce system costs dramatically by
permitting the substitution of smaller piping.
Please contact Milton Roy for further information
on pulsation dampeners.
2.8 BACK PRESSURE VALVES
A Milton Roy back pressure valve should be
installed in the discharge line near the pump to
ensure sufficient discharge head pressure for
proper pump metering action. Normally, the valve
should be located near the pump; however, back
pressure valves for large pumps with long and
extremely small discharge lines may have to
be installed near the point of discharge into the
process (to minimize siphoning tendencies).
SECTION 2 - INSTALLATION

10 Installation, Operations & Maintenance Manual
2.9 SAFETY VALVES
MOTOR-DRIVEN POSITIVE DIS-
PLACEMENT PUMPS CAN DE-
VELOP TREMENDOUS DISCHARGE PRESSURES LONG BE-
FORE THERMAL OVERLOAD DEVICES INTERRUPT THE MO-
TOR ELECTRICAL CIRCUIT. TO PREVENT A BLOCKED DIS-
CHARGE LINE FROM CAUSING DAMAGE TO THE PUMP, PIP-
ING, OR PROCESS EQUIPMENT, INSTALL A MILTON ROY
SAFETY VALVE IN THE PUMP DISCHARGE LINE. THIS VALVE
IS DESIGNED AND SIZED TO HANDLE SYSTEM FLOW RATES
AND PRESSURES SAFELY WHILE RESISTING CORROSION BY
THE PROCESS LIQUID.
Install the safety valve in the discharge line
between the pump and the nearest shut-off valve
(This will prevent pump damage from accidental
valve closure.) Pipe the safety valve outlet back
to the suction tank or to drain, but in either case
ensure that the pipe end is continuously visible so
safety valve leakage may be detected.
2.10 CHECK VALVES (Figure 7)
A check valve should be installed at the point
where the discharge line enters a boiler or other
high-pressure vessel. This will prevent back ow
through the discharge piping and will isolate
the pump discharge from system pressures
(a safety consideration).
Figure 7. Safety and Back Pressure Valves
SECTION 2 - INSTALLATION

11Installation, Operations & Maintenance Manual
2.11 SHUT-OFF VALVES
Provide shut-off valves in both suction and
discharge lines next to the pump. Locate discharge
line shut-off valve downstream from the inlet
connection of the safety valve. Figure 8 shows
recommended valve locations.
2.12 SERVICE CONNECTIONS
2.12.1 Pump Drive
Check the nameplate data on the pump drive motor
and insure proper power supply is available before
making any connections.
The preferred motor shaft rotation is shown by
an arrow on the drive side ange of the pump.
Running the motor in the indicated direction
minimizes the potential for damage to the drive.
If running in the opposite direction is required,
contact the Milton Roy service department for
recommendations.
For drives other than constant speed electric
motors, refer to manufacturer’s instructions and
service information included with pump.
Figure 8. Recommended Valve Locations
SECTION 2 - INSTALLATION

12 Installation, Operations & Maintenance Manual
2.12.2 StufngBox
The stuffing box is designed to handle most
clear, free-flowing liquids; however, liquids
with suspended solids and abrasives
(e.g., certain slurry and phosphate solutions) tend
to precipitate in the packing, causing abnormal
wear on packing and plunger. An internal ushing
connection used with a V- or Chevron-type
packing will minimize this tendency and increase
packing and plunger life in these applications.
(For abrasive slurry applications, ball-check valve
cartridges should be installed remote from pump
liquid end. Contact Milton Roy for full details.)
To connect for internal ushing, remove the stufng
box grease tting and connect the stufng box
to a source of water (or other compatible liquid)
at 25 to 50 psig (172 to 345 kPa) above suction
pressure. Since only a few drops per minute are
necessary, small diameter tubing will suffice.
Install a 1/8” or 1/4” NPT stainless steel aircraft
hydraulic system check valve on the ush line right
next to the stufng box connection to keep the
process liquid from backing up through the ush line
if the packing should fail.A 1/8” or 1/4” (3.2 or 6.4 mm)
needle valve should be included for controlling the
ushing liquid ow rate. The Milroyal®C can be
tted at the factory or in the eld with a Swagelok®
elbow and tubing to exit through the pump housing
for connection to a ushing line. Contact your
Milton Roy representative to order these two parts.
Through ush connections to carry hazardous or
undesirable uids from the stufng box can be
provided for by drilling and tapping the stufng
box during manufacture. In these installations,
the ushing liquid is piped away from the stufng
box to a drain or other suitable disposal point.
For specic instructions concerning eld installation
of through ushing, consult Milton Roy and provide
full details of the application.
2.12.3 Drains
Provide drains convenient to the pump so that
any leakage of hazardous uids may be diverted
to suitable container or area. The pump catchall
area (beneath the small top cover) is provided
with a hole drilled and tapped to receive piping for
drainage.
2.12.4 Auxiliary (Accessory) Equipment
Service connections for auxiliary or accessory
electrical equipment should be determined
by referring to wiring diagrams, instruction
manuals, and the data plate furnished with the
equipment. Air-operated equipment should
normally be supplied with two sources of air.
The power elements require a standard
60 psig (414 kPa) (80-100 psig (552-690 kPa) at
compressor) plant air supply (however, an 80 psig
(552 kPa) supply (90-100 psig (621-690 kPa) at
compressor) is recommended to ensure maximum
performance under all conditions). Instrument air
should be supplied from a control instrument or
from a manual air pressure regulator furnished with
30 psig (207 kPa) service.
SECTION 2 - INSTALLATION

13Installation, Operations & Maintenance Manual
3.1 INITIAL START-UP
Remove covers (6083 and 6085) from top of pump
casing and check that interior is free of debris.
Reinstall catchall cover (6085). Install oil cleaning
magnet (12) over the oil pump intake hole on the
underside of the crosshead guide section of the
pump casing (see Assembly Drawing, Figure 12 for
magnet location). The magnet is bagged with other
loose parts shipped in the catchall of the pump.
Check that all mounting bolts are tight, piping is
installed properly, and the discharge line is open.
Fill the pump casing with the lubricant supplied
with the pump; ll to the bottom of the oil level
plug which is located at the level of the crosshead
(12- 1/2” above the housing feet). Pour lubricant
into the casing over the bearings and gear set.
(rell amount shown below). Replace cover (6083)
over the oil sump.
NOTE:
Because gear oil viscosity increases as the
ambient temperature decreases, you must
choose a gear oil appropriate for both the
ambient and operating temperatures. Operating
temperatures are typically 75°F higher than
ambient temperatures. See below for oil
recommendations.
Connect pump motor for clockwise rotation as
indicated by arrow (8002) on pump casing.
3.2 OIL SPECIFICATIONS
GEAR LUBRICANTS
Operating Oil
Temperature* Type Oil Recommended
-30°F to 250°F Mobil SHC 634 Synthetic,
ISO 460
-10°F to 40°F Mobil Gear 629, ISO 150
15°F to 125°F AGMA #7 Comp., ISO 460
*Maximum Oil Temperature 250°F. The nominal
capacity of the Milroyal®C housing is 80 pints
(44 liters).
Food Grade
Equivalent
15°F to 125°F Only
Nevastane EP 460
HYDRAULIC FLUIDS
Operation Type Oil Recommended
HPD Liquid End &
Disc Diaphragm Zurnpreen 15A, ISO 32
Food Grade
Equivalent Nevastane AW32
3.3 INITIAL ADJUSTMENTS
3.3.1 Micrometer Capacity Control
To adjust pump capacity, loosen the stroke locking
screw (110, Figure 12) in the casing above the
micrometer-adjust hand knob (490), and turn the
hand knob until the desired capacity percentage
is just visible on the stroke indicator plate (95).
Then tighten the locking screw to maintain capacity
setting.
3.3.2 Electric Capacity Control
An Electric Capacity Control may be mounted on
the pump housing in place of the micrometer-adjust
hand knob. This accessory adjusts stroke length in
response to manual or automatic electric signals
from process control instruments. Electric Capacity
Control is described in a separate Instruction
Manual (53870).
3.3.3 Pneumatic Capacity Control
Pneumatic Capacity Control may be mounted on
the pump housing in place of the micrometer-adjust
hand knob. This accessory adjusts stroke length
in response to pneumatic signals from a remotely
located control unit. Pneumatic Capacity Control is
described in a separate Instruction Manual.
3.3.4 Speed Capacity Control
Milroyal®’ s may be tted with variable-speed motors
to provide capacity control through adjustments in
drive speed. Such motors and control accessories
are available as options from Milton Roy(54269).
SECTION 3 - OPERATION

14 Installation, Operations & Maintenance Manual
3.3.5 Capacity Calibration
After the rst 12 hours of operation, the pump may
be tested and calibrated to nd the exact pump
capacity under specic operating conditions.
Usually, calibrating the pump at only 100, 50, and
10 percent capacity settings is enough to indicate
pump performance throughout the adjustment
range.
The pump can be calibrated by one of two methods
carried out in a given time:
1. Measure the decrease in liquid level pumped
from a calibrated vessel.
2. Collect and measure pumped liquid at the
pump discharge port. (It may be necessary
to create discharge head at the liquid take-off
point; otherwise pump will not operate properly.
See Section 2 for ways to do this.)
The rst method is recommended for hazardous
liquids because it eliminates operator contact with
the liquid.
3.4 FILLING PUMP SYSTEM
It is especially important that pump suction
and discharge lines be free of entrained air.
To ensure this condition, operate the pump under
no discharge pressure and ll the entire pumping
system with liquid before starting pressure tests.
If the pump is idle for long periods, temperature
changes in the process liquid may produce air in
the system. To discharge the air, install a valve in
the discharge line which will allow the process liquid
to be pumped to exhaust when starting the pump.
3.5 PREVENTATIVE MAINTENANCE
Milroyal®C pumps are carefully designed,
manufactured, assembled, and quality tested to
give reliable service with minimal maintenance.
However, a daily maintenance check is
recommended to visually conrm proper operation
of the pump.
3.5.1 Drive
Check gear drive oil level monthly and add oil as
required.
Change gear drive lubricant and clean magnetic
lter below crosshead chamber every six months
or after every 2500 hours of operation, whichever
occurs rst. (This may be scheduled with seasonal
oil changes.)
3.5.2 Motor
Lubricate drive motor annually or according to
motor manufacturer’s instructions.
3.5.3 Check Valves
Check valve assemblies are designed to be
self-cleaning and should seldom need servicing.
Fouled check valves can usually be cleaned by
pumping a hot detergent solution for 15 minutes,
followed by water ushing.
SECTION 3 - OPERATION