Ace FMC-75-HYD Series User manual

INSTRUCTION
MANUAL
HYDRAULIC MOTOR DRIVEN
CENTRIFUGAL PUMPS

STANDARD WARRANTY
Ace pumps and valves are guaranteed against defects in material and workmanship for a period
of one year from date of installation. Products or parts found to be defective upon inspection
at the factory will be repaired or replaced at our discretion.
Ace Pump Corporation shall not be held liable for damages caused by abuse or misuse of the
product or parts. No claim for labor in repairing or replacing such products will be allowed nor
will loss of time or inconvenience be considered warranty obligations.
IMPORTANT: Pumps or valves returned for warranty consideration which are tested and found
to perform within specications are subject to an inspection charge.
PLEASE NOTE EXCEPTIONS
1. All seals are covered against defects in materials or workmanship. Seal failures resulting
from application related conditions are not covered. Most seal failures are due to application
conditions such as: (1) abrasive solution scratching the polished seal faces; (2) chemical
attack on elastomer or glue; (3) thermal shock from running pump dry or improper priming; (4)
failure to ush chemical from pump after use.
2. Gasoline engines are covered by the engine manufacturer’s warranty. Engines submitted for
warranty consideration should be returned to the nearest authorized engine repair station. DO
NOT RETURN ENGINE TO ACE PUMP CORPORATION. If unable to locate nearest engine
repair station, consult Ace for referral.
3. On Ace belt driven centrifugal pumps, belt alignment is not to be considered as covered by
warranty. Misalignment can occur in transit and is easily corrected at point of installation.
4. Repair requests under the above categories will not be considered warranty, and current
repair and transportation charges will apply.
PROCEDURE
To return a pump, valve, or part for warranty consideration, please call Ace Pump and request
a Returned Goods Authorization (RGA) number (800-843-2293). Please request one RGA
number for each pump or valve. Provide the part number of the item being returned along
with the reason for return. Be specic when describing the nature of the defect. Include this
information in the box along with a customer contact name, phone number, and return address.
Ship pump prepaid freight. Package pump in original packaging or similar to prevent damage
in shipment. Warranty determinations will be made after the product has been received and
inspected.
This warranty is in lieu of all other warranties, express or implied, and Ace Pump Corporation
does not authorize any other person to assume for it any obligation or liability in connection
with the sale of said pumps, valves, or any parts thereof.
WARNING: Pumps returned to Ace must be free of chemical hazard. Chemicals must be
neutralized and thoroughly rinsed. Pumps with indications of active chemical will not be
considered for repair or warranty.

TABLE OF CONTENTS
WARNINGS
AVOID HIGH PRESSURE FLUIDS
Escaping uid under pressure may penetrate the skin causing serious injury. Avoid the hazard
by relieving pressure before disconnecting hydraulic lines. Tighten all connections before
applying pressure and inspect hoses regularly for wear or damage. If an accident occurs,
see a doctor immediately. Any uid injected into the skin must be surgically removed within
a few hours or gangrene may result.
NEVER OPERATE MOTOR UNLESS ATTACHED TO PUMP
The motor should never be operated separate from the pump. The four bolts which attach
the motor to the pump also provide the strength necessary to hold the motor together during
operation. Operating the motor separate from the pump may cause the motor to explode.
The shaft seal may also be ejected when hydraulic pressure is applied. Motor damage and
personal injury may result.
HANDLE CHEMICAL PRODUCTS SAFELY
Direct exposure to hazardous chemicals may cause serious injury. Potentially hazardous
chemicals used with Ace pumps are hydraulic uid, fertilizer, and chemicals. A Material Safety
Data Sheet (MSDS) provides specic details on chemical products: physical and health
hazards, safety procedures, and emergency response techniques. Check the MSDS before
starting any job using a hazardous chemical.
Note: Pump performance data, dimensions, and parts listings
are on individual pump specication sheets and are not included
in this manual. The specication sheets may be downloaded
from the Product Literature page at www.AcePumps.com or
call 800-843-2293 to request a copy.
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1

Coasting Check - This internal feature is standard for all Ace hydraulic motors. It protects the
motor seal from pressure spikes created by the ywheel effect of the impeller when the pump is
turned off.
Needle Valve - The valve allows for bypass of excess hydraulic uid on open center hydraulic
systems. The valve has a threaded needle with a slotted end and lock nut. The needle on 300A
motors is located under a hex cap with no lock nut.
Reverse Flow Check - The check valve prevents damage by not allowing the pump to run backwards.
The valve is an external tting on the 200N series motors and internal on 300 series models.
HYDRAULIC MOTOR FEATURES
Hydraulic Hose Connections:
200 Series - 1/2” NPT
300 Series - 1/2” NPT
Consult these Ace Product Updates for more information:
Update 1 - Hydraulic Seals
Update 12 - Seal Support Spacer
Update 14 - 200N Series Motors
Update 15 - 300A Series Motors
2
Anti-Vortex
Tank Fitting
Tank Valve
Pressure
Gauge
Shut-off
Valve
Line
Strainer
Agitation Valve
Agitation
Pressure Gauge
Jet Agitator
Control Valve
Flow Meter
Boom Valves
A = 10 x hose diameter
A
Pressure Spike Valve
“Suggested for MAX Series”
PLUMBING DIAGRAM

SPRAYER PLUMBING SUGGESTIONS
PUMP MOUNTING
HYDRAULIC SYSTEM CONNECTIONS
HYDRAULIC MOTOR SEALS
The primary goal when plumbing a sprayer pump is to route liquid from the pump to the spray
boom with minimum restriction. Minimizing restrictions is necessary for achieving the pump’s
maximum rated capacity. 1) Hoses should be the same size as the pump’s suction and
discharge port. A straight run of 10 times the suction hose diameter is recommended prior to
the pump inlet. 2) Install a pressure gauge and ball valve on the discharge side of the pump
for the purpose of measuring the SHUT-OFF pressure (refer to page 4). 3) A minimum number
of elbows, ttings, and valves should be used to reduce pressure losses. 4) Use spray control
valves and a owmeter that are the same size as the discharge port to prevent ow restriction.
Following these guidelines is necessary for delivering the highest pressures to the boom.
The following are basic guidelines for proper pump mounting: 1) The pump should be mounted below
the tanks to allow gravity to naturally ll the pump with liquid. 2) The volute should be oriented with the
discharge port pointing up or across the top of the pump which allows air to rise out of the pump. 3) A
petcock valve can be installed in the top most pipe plug hole to allow air to be bled off each time the
tanks are lled. 4) Another option would be to install a 1/8” air bleed line from the top most pipe plug
hole to the sprayer tank. This will continually bleed air from the pump housing. 5) If the pump must
be located above the liquid level, a foot valve should be installed to maintain the pump’s prime.
The hydraulic driven centrifugal pumps are straight centrifugals and must be primed prior to operation.
The word “primed” means the pump must be completely full of water and any trapped air vented before
a centrifugal pump can operate. Following the pump mounting guidelines will insure proper priming of
the pump and avoid premature seal failure.
The following hydraulic connection recommendations are important for optimum pump efciency and
extended motor seal life. 1) Hydraulic hoses should be sized to insure proper oil supply to the motor
and minimize back pressure on the return side of the motor. Recommended hose sizes are 1/2” for
200 Series motors and 3/4” for 300 Series motors. The hoses should be sized larger if individual hose
lengths exceed 15 feet. 2) Connect the hydraulic hoses to the tractor hydraulic couplers so the pump
operates with the control lever in the “Lower/Retract” position. The pump can then be turned off in
the forward “Float” position. Turning the pump off in “Float” instead of “Neutral” allows the hydraulic
system pressure to equalize and reduces the occurrence of damaging pressure spikes. 3) The return
line should be connected to a low pressure return port if available. The low pressure return port returns
oil directly to the oil reservoir reducing pressure in the return line. Pressure reduction in the return line
extends the motor seal life and increases the motors operating efciency. Consult your tractor dealer
for low pressure return options.
Hydraulic seal failures are typically caused by high pressure or pressure spikes in the return line.
The seal is rated for 250 PSI maximum pressure. Maintaining return line below 100 PSI continuous
pressure will assure maximum seal life and efcient operation. Minimize back pressures in the return
line by plumbing an unobstructed return back to the hydraulic reservoir or motor return port. Avoid
returning the oil through remote valves, couplers, and long undersized hose lengths. Consult your
tractor dealer for low pressure return options.
Do not install any hydraulic components in series downstream from the sprayer pump motor.
Consult Ace Product Update 1 - Hydraulic Seals for additional information.
3

REGULATING HYDRAULIC FLOW TO THE SPRAYER PUMP
FLOW LIMITER
The ow limiter is a hydraulic device designed to shut off the ow of hydraulic oil when a motor’s
rated ow is exceeded. On tractors with LOAD SENSING (LS) Closed Center hydraulic systems,
it prevents failures due to excess ow. These tractors present a great potential to run the motors
beyond their rated speeds. The ows out of the hydraulic valves can exceed 29 GPM while the
motors are rated at 4 to 11 GPM. The ow limiter protects the Ace motor by shutting off when
hydraulic ows exceed the motor’s capacity.
The ow limiter should not be used on OPEN Center or PRESSURE COMPENSATING Closed
Center hydraulic systems. The ow limiter should not be used with a restrictor orice.
Consult Ace Form # FLOW LIMITER for additional information and specications.
WARNING: FAILURE TO REGULATE OIL FLOW WILL CAUSE MOTOR FAILURE
There are three general types of hydraulic systems: 1) Load Sensing (LS), also known as
Pressure-Flow Compensating Closed Center, 2) Pressure Compensating Closed Center (PC), and
3) Open Center (OPEN). The ow of hydraulic oil is regulated in a different manner for each type
of hydraulic system. Consult the Tractor Hydraulic System Pump Selection Guide(HSG), Internet
Hydraulic Selection Guide (IHSG) at www.AcePumps.com, or your tractor dealer to determine the
type hydraulic system on your tractor and the method of regulation.
SHUT-OFF PRESSURE
Shut-off pressure is the sprayer system pressure with all ow turned off. This means closing
the boom, agitation, and any by-pass valves. It is the highest pressure a centrifugal pump will
achieve for a given RPM and relates directly to the ow of hydraulic oil. A pressure gauge must
be located between the pump discharge and the shut off valves.
Maximum Shutoff Pressure:
FMC-75-HYD 100 PSI FMC-150FS-HYD 120 PSI
FMC-HYD 100 PSI FMC-150SP-HYD 120 PSI
FMC-150-HYD 120 PSI FMC-200-HYD-210/310 80 PSI
FMC-150F-HYD 120 PSI FMC-200-HYD-304 120 PSI
LOAD SENSING CLOSED CENTER SYSTEM
Regulate oil ow with tractor’s FLOW CONTROL and FLOW LIMITER.
(Do not use restrictor orice.)
Setup Instructions:
1. Suggested: Remove adapter and install ow limiter in motor inlet port (marked I).
2. Close motor needle valve: loosen jam nut, screw needle valve clockwise
until seated, and lock jam nut. (factory setting)
3. Shut off sprayer boom and agitation valves.
4. Adjust tractor ow control to minimum ow setting (turtle).
5. Move hydraulic lever to “Lower/Retract” position to start pump.
6. Adjust tractor ow control until sprayer shut-off pressure is below
maximum shown in SHUT-OFF PRESSURE section above.
Note: If the ow limiter stops oil ow to the motor: 6a) Move hydraulic
lever to “Float” or “Neutral” to remove oil pressure from the ow limiter.
6b) Adjust tractor ow control to a lower ow position.
6c) Repeat steps 5 and 6.
7. Open the sprayer agitation valve to get desired spraying pressure.
Flow Limiter
(Optional)
Flow Control
4

MECHANICAL SHAFT SEALS
Mechanical seals have two polished faces which run against one another forming a barrier
preventing solution from leaking. A small quantity of liquid crosses the faces and is necessary
to lubricate and remove heat from the seal faces. The two most common causes of seal failure
are:
1) Abrasive Wear - The carbon seal face is scratched by harder material crossing the face. Damage
to the seal by harder materials can be caused by abrasive solution materials, rust or corrosion
near the seal, precipitates which come out of solution when heated, and residue between the
seal faces when a pump is shut off and not ushed out. This type of seal failure can be minimized
by ushing the pump with water after use and storing the pump lled with antifreeze to prevent
corrosion and freezing.
Note: In tough applications where the standard carbon seal face is scratched or quickly worn,
the BAC-7SC seal with extra hard silicon carbide faces is recommended.
2) Thermal Shock - The seal face is cracked by cool liquid contacting a hot seal. There is no
liquid to lubricate or remove heat from the seal faces when a pump runs dry. The seal heats up
rapidly to a temperature that causes damage to the seal components. The resulting thermal shock
creates radial cracks in the white ceramic face and the heat may melt rubber components.
Consult Ace Product Update 2- Mechanical Seals for additional information.
PRESSURE COMPENSATING CLOSED CENTER SYSTEM
OPEN CENTER SYSTEM
Regulate oil ow by using a RESTRICTOR ORIFICE. (Do not use ow limiter.)
Setup Instructions:
1. Install restrictor orice insert inside the adapter/restrictor body
in the motor inlet port (marked I).
2. Close motor needle valve: loosen jam nut, screw needle valve
clockwise until seated, and lock jam nut. (factory setting)
3. Set “Rabbit/Turtle” ow control to “Turtle”.
4. Move hydraulic lever to the “Lower/Retract” position to start
pump.
5. Adjust “Rabbit /Turtle” ow control and sprayer agitation valve
to get desired spraying pressure.
Restrictor Orice
Insert
Select motor size closest to tractor’s hydraulic system capacity. Regulate oil ow with motor
NEEDLE VALVE. (Do not use restrictor orice or ow limiter.)
Setup Instructions:
1. Shut off sprayer boom and agitation valves.
2. 200N - Loosen jam nut on motor and back out needle valve 3
or 4 turns counter clockwise.
300A - Remove hex cap from side of motor and back out needle
valve 3 or 4 turns counter clockwise.
3. Set tractor throttle to sprayer operating speed.
4. Move hydraulic lever to “Lower/Retract” position to start pump.
5. Screw needle valve clockwise until sprayer shut-off pressure
is below maximum shown in SHUT-OFF PRESSURE section
on previous page and lock jam nut or reinstall hex cap.
6. Open the sprayer agitation valve to get desired spraying pressure.
Needle Valve
Adjustment
5

DISASSEMBLY INSTRUCTIONS
PUMP REPAIR KITS
Ace hydraulic pump repair kits include the mechanical seal and volute O-ring. Pumps manufactured
after January 1996 use the volute O-ring and have a groove machined in the volute. Older pumps
require a gasket volute seal. Note: Do not use both the O-ring and gasket.
1. Remove four 5/16” socket head cap screws from rear of motor.
2. Remove motor and seal support spacer.
3. Remove rear internal bearing snap ring.
4. Remove four 3/8” X 3/4” hex head cap screws from mounting frame.
5. Remove volute.
6. Remove 3/8” lock nut from shaft. Insert a at le into impeller vane to hold stationary.
Caution: Excess torque may cause damage to plastic impellers.
7. Press shaft out of impeller using one 5/16” socket head cap screw from step #1.
8. Remove impeller, key, and rotating seal member.
9. Press shaft/bearing assembly out of frame.
10. Remove stationary seal member by prying out with a screwdriver or pressing out from motor
end of pump housing.
11. Remove O-ring from shaft groove.
Note: If you are only replacing the pump seal: 1) press the shaft/bearing assembly into the
frame, 2) reinstall the rear internal bearing snap ring, and 3) skip to Assembly Step #8.
12. Press bearings off of shaft.
13. Remove forward internal bearing snap ring.
Pump
Motor
Seal Support Spacer
Disassembly Steps 1-5
6
Pump Model Standard Seal
BAC-7V
Severe Duty Seal
BAC-7SC
FMC-75-HYD Series RK-GE-75 RK-GESC-75
FMC-HYD Series RK-FMC RK-FMCSC
FMC-150-HYD Series RK-FMC-150 RK-FMCSC-150
FMC-150F-HYD Series RK-FMC-150 RK-FMCSC-150
FMC-150SP-HYD Series RK-FMC-150 RK-FMCSC-150
FMC-200-HYD Series RK-FMC RK-FMCSC
Service videos are available on our website at www.AcePumps.com

ASSEMBLY INSTRUCTIONS
MAINTENANCE AND STORAGE
1. Ace pumps are equipped with factory lubricated bearings and require no further lubrication.
2. If danger of freezing exists, drain the pump by removing the bottom volute pipe plug.
3. Neutralize chemicals and ush pump after each use to prevent corrosion.
4. Pump storage:
A. Flush out pump with clean water.
B. Fill pump with oil or recreational vehicle antifreeze to protect from corrosion and freezing.
C. Insert plugs in the motor hydraulic ports to retain some hydraulic uid and prevent rusting.
1. Install forward internal bearing snap ring in mounting frame.
2. Press in forward bearing from rear side of mounting frame
to snap ring.
3. Install two external shaft retainer rings with spacer between
on shaft.
4. Press shaft assembly through forward bearing until forward
shaft snap ring rests against inner face of forward bearing.
5. Press rear bearing over shaft and into housing.
6. Insert rear internal bearing snap ring.
7. Slide rubber slinger over shaft and push back to front
bearing.
8. Clean old sealant from mounting frame seal bore.
9. Install O-ring in shaft groove.
10. Apply non-hardening Type 2 Permatex or similar under
stationary seal ange.
11. Place stationary portion of seal over shaft and press into seal
bore cavity. Use a 1-3/8” ID pipe or PTO adapter to press seal
ange evenly on all sides.
12. Install rotating portion of seal over shaft and O-ring by hand.
The two polished seal faces should face each other.
Avoid contacting the polished seal faces.
13. Apply anti seize compound to impeller seat area on the shaft
and key.
14. Insert key in keyway and install impeller on shaft.
15. Place lock washer and 3/8” lock nut on shaft and tighten nut.
16. Replace volute O-ring, volute, and four 3/8” x 3/4” cap screws.
17. Position seal support spacer in the cavity behind the pump
bearing and snap ring. The smaller diameter of the 200 series
spacer faces the motor. Fill the spacer hole halfway with
coupling grease.
18. Install motor by aligning motor tang and coupler slot.
Rotate motor to proper orientation.
19. Install four 5/16” socket head cap screws and tighten to 15 ft. lb. torque.
Assembly Steps 1-6
Assembly Step 11
7

HYDRAULIC MOTOR REPAIR KITS
MOTOR REPAIR KIT INSTALLATION
Ace hydraulic motor repair kits include all O-rings and seals necessary to rebuild the motor. The motor
model number and date code are stamped on the end plate below the ports. The 200 series kit will t
all motors including those with “L”, “N”, or “R” designation. The 300 series kit will t all motors including
those with “L” or “A” designations except 310 motors with G-5 or earlier date codes.
NOTE: The seal cartridge comes on an installation bullet with a small diameter for storage and
a larger diameter for installation. The seal lips curve towards the larger diameter when properly
installed on the bullet. The seal should remain on the bullet until installation for best results.
DISASSEMBLY:
1. Remove motor from pump by removing four cap screws.
2. Remove seal retaining ring from drive plate if installed and discard.
3. Remove two 1/4” cap screws (200 series) or four 3/8” cap screws (300 series).
4. Draw or scribe a line on motor casing (end plate, drive plate, housing), note orientation, and
pull apart.
5. Remove idler gear/shaft assembly, drive gear, and drive shaft dowel pin.
Note: Failure to remove dowel pin will result in bushing damage.
6. Press or tap (non-marring hammer) drive shaft/bearing assembly, and seal cartridge out of
drive plate.
7. Remove and discard old “O” rings and seal cartridge. Check shaft for wear or grooving under
seal and replace if damaged.
Disassembly Step 6
8
Motor Model Repair Kit Part Number Ace EDP#
200 Series Motors (202, 203, 204, 206, 210) RK-BAC-75-HYD-L 41374
300 Series Motors (304, 305, 306, 307, 310) RK-BAC-75-HYD-300-L 41362
310 Motor (G-5 or earlier) RK-BAC-75-HYD-310 41379

ASSEMBLY:
1. Place drive shaft/bearing assembly in drive plate.
2. Apply a thin lm of hydraulic oil to the seal bullet. Insert seal/bullet assembly over shaft
tang. Press seal by hand over the installation bullet until the seal casing touches the
drive plate.
3. Place a 3/4” (200 Series) or 15/16” (300 Series) deep socket over seal and press or tap into
seal cavity until seated.
4. Remove the installation bullet.
Note: Do not install the seal retaining ring with the seal support spacer.
5. Lightly grease large “O” rings and insert in plate grooves. (300 series grooves in gear housing)
6. Place dowel pin and drive gear on drive shaft.
7. Place idler gear/shaft assembly in drive plate bushing.
8. Assemble the drive, center, and end plates aligning scribe marks.
9. Install two 1/4” cap screws - torque 6-8 ft-lbs (200 series) or four cap screws - torque 24 ft-lbs
(300 series).
Caution: Do not over tighten.
10. Remove needle valve, replace thread seal (metal washer with rubber insert) by screwing it onto
the needle, and reassemble.
Note: Forcing the thread seal of the needle threads may damage the seal.
11. Remove seal check cap from drive plate with 5/32” allen wrench (200 series) or 7/8” wrench
(300 series), replace seal check cap “O” ring, and reassemble.
12. Position seal support spacer in the cavity behind the pump bearing and snap ring. Fill the
spacer hole halfway with coupling grease.
Note: The smaller diameter of the 200 series spacer must face the hydraulic motor.
13. Install motor by aligning motor tang and pump shaft slot. Rotate motor to proper orientation.
14. Install four 5/16” socket head cap screws and tighten to 15 ft.lb. torque.
Assembly Step 3
9

There are several operating conditions which must be met before a hydraulic motor driven centrifugal pump can pump liquid.
If the shaft is not turning, check the rst and second step. If the shaft is turning, go to the third step.
First, the impeller, shaft, and gears must turn freely. The hydraulic motor is a low torque motor and will not overcome a bound
up shaft. Corrosion can form between the impeller and the volute or in the seal area. With the tractor off, reach inside the
suction port of the volute with your ngers and see if the impeller can easily be turned by hand.
Second, hydraulic oil must ow across the gears in the motor. Check the needle valve to make sure it is set according the
instructions on pages 4 and 5. If the needle valve is backed out, oil will by-pass the gears and fail to turn the shaft.
Trapped pressure in the hydraulic couplers may also prevent ow across the hydraulic motor. Reverse the hydraulic control lever
to momentarily pressurize the return hose. This action will open the quick coupler valve and relieve the trapped pressure.
Third, the pump must be primed. The pump will not operate unless the volute cavity is completely full of liquid when started.
Remove the top pipe plug on the volute to verify that only liquid comes out. Refer to PUMP MOUNTING section on page
three.
There are several factors which may contribute to a pump’s inability to develop pressure.
They are: 1) insufcient shaft speed; 2) restrictions in the plumbing; 3) internal leakage in the pump.
Check the SHUT-OFF PRESSURE according to the instructions on page 4. If the Shut-off Pressure is per the specications,
then the pressure drop is due to restrictions in the plumbing. If the shut-off pressure is below the specications, it could be
due to insufcient shaft speed or internal leakage in the pump.
Restrictions in the plumbing: For every length of hose, valve, strainer, and tting between the pump and the boom, there
is a loss of pressure. Check for clogged strainers, collapsed hoses, standard port valves, and undersized plumbing.
Insufcient shaft speed: The pressure created by a centrifugal pump is a function of the pump shaft speed. The shaft
speed is determined by the ow rate of hydraulic oil going across the gears. A tractor dealership can use a hydraulic ow
meter to verify the GPM of oil ow going to the hydraulic motor. For instructions on how to adjust the shaft speed, refer to
the section on pages 4 and 5 titled: REGULATING HYDRAULIC FLOW TO THE SPRAYER PUMP.
Internal leakage in pump: In centrifugal pumps, there is a close t where the eye of the impeller ts into the inlet port of the
volute. This close t seals the low pressure suction liquid from the high pressure liquid inside the pump. If either the impeller
or volute are worn, then the pump will not develop pressure because liquid pressure leaks through this area. If there is
signicant play when the eye of the impeller ts into the inlet port of the volute, replace the impeller and/or volute.
Ace Pump Corporation P.O. Box 13187 - 1650 Channel Avenue Memphis, TN 38113
www.AcePumps.com Phone: [phone] Fax: [phone]
Ace Form # HYD-MAN
Revised 12/11
TROUBLESHOOTING
WILL NOT PUMP LIQUID
WILL NOT DEVELOP PRESSURE
SEAL LEAKS
Refer to the sections titled MECHANICAL SHAFT SEALS on page 5 and HYDRAULIC MOTOR SEALS on page 3 for
information on reducing the frequency of seal failures.
When a pump starts out at the correct pressure and then gradually looses pressure over a period of several hours, the likely
cause is due to the hydraulic oil heating up. As hydraulic oil heats up from 90 degrees Fahrenheit to 150 degrees, the pump
performance will decrease 30%. Typically, the heat added to the system is due to energy losses caused by large bypass
ows and restriction. Improper regulation of hydraulic oil to the Ace motor can cause the oil to heat up (refer to pages 4 and
5 for setup instructions).
LOSES PRESSURE GRADUALLY OVER SEVERAL HOURS