Oasis Ace MAX Series User manual

1
INSTRUCTION
MANUAL
MAX SERIES
HYDRAULIC MOTOR DRIVEN
CENTRIFUGAL PUMPS
WetSeal Technology
O
ASIS
T M

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TABLE OF CONTENTS
Pump performance data, dimensions, and part listings are on individual pump specication
sheets. These specication sheets may be downloaded from the Product Literature page at
www.AcePumps.com or call 800-843-2293 to request a copy. Solid models are available at
www.3DContentCentral.com.
Warnings 3
Plumbing Diagram 4
Pump Mounting 4
Plumbing Suggestions 5
Hydraulic Motor Features 6
Hydraulic System Connections 6
Hydraulic Motor Seals 6
Regulating Hydraulic Flow 7
Oasis™ WetSeal Technology 8
Pump Maintenance 8
Oasis™ WetSeal Maintenance 9
Winterizing and Storage 9
FMC-650-HYD Repair Instructions 10
FMCWS-650-HYD Repair Instructions 12
FMC-750F-HYD Repair Instructions 14
FMC-855F-HYD Repair Instructions 16
Hydraulic Motor Seal Kits 18
Motor Shaft Seal Replacement 18
Motor Disassembly and Reassembly 19
Warranty 20
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, seek
medical attention immediately. Any uid injected into the skin must be
surgically removed within a few hours or gangrene 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 Safety Data
Sheet (SDS) provides specic details on chemical products: physical and health hazards,
safety procedures, and emergency response techniques. Check the SDS before starting any
job using a hazardous chemical.

4
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
PLUMBING DIAGRAM
PUMP MOUNTING
Ace 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 the
pump is operated. Following the pump mounting guidelines will insure proper priming of the pump
and avoid premature seal failure.
The following are basic guidelines for proper pump mounting:
¾The pump should be mounted below the tank(s) allowing gravity to naturally ll the pump with
liquid.
¾The volute should be oriented with the discharge port pointing up (A) or across the top (B) of
the pump which allows air to rise out of the pump.
If the volute must be oriented at the
bottom (C) or across the bottom (D):
1. A vent line is required to continually
bleed air from the pump housing.
It should be installed from the
highest pipe plug hole to the top
of the sprayer tank.
2. A petcock valve can also be installed in the highest pipe plug hole to bleed the air manually
each time the tanks are lled.
¾If the pump must be located above the liquid level, a foot valve should be installed to maintain
the pump’s prime.
A B C D

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PLUMBING SUGGESTIONS
The primary goal when plumbing a sprayer pump is to route liquid with minimum restriction. Minimizing
restrictions is necessary for achieving the pump’s maximum rated capacity. The following are
recommended practices to maximize pump performance and efciency:
¾Hoses should be at least the same size as the pump’s suction and discharge port. Pump
performance may be increased up to 20% by using one size larger suction hose.
A straight run of 10 times the suction hose diameter is recommended prior to the pump inlet.
Example: 1.5” (38.1 mm) hose diameter = 15” (38.1 cm) of straight hose
The straight section provides laminar water ow to the pump.
¾A minimum number of elbows, ttings, and valves should be used to reduce pressure losses.
These should also be sized properly to prevent ow restrictions.
¾An anti-vortex tting should be installed on the suction port inside the tank. This tting prevents
a vortex from forming when the tank liquid level is low. A vortex will allow the pump to pull air in
causing irregular performance or loss of prime.
¾Install a pressure gauge and valve on the discharge side of the pump for the purpose of measuring
the SHUT-OFF pressure. The SHUT-OFF pressure is needed for the setup of HYD series
pumps.
¾An agitation ow rate of 5% of the tank capacity is recommended for most chemicals. A higher
rate of 10% is suggested for wettable powders and materials difcult to keep in suspension. See
the chart below for common tank sizes.
Tank Capacity 5% 10%
500 gallons 25 gpm 50 gpm
750 gallons 37 gpm 75 gpm
1000 gallons 50 gpm 100 gpm
1500 gallons 75 gpm 150 gpm
Jet agitators are the most efcient way to agitate a large tank. They operate on an entrainment
principle where ow through an orice is multiplied by capturing surrounding uid. The ow rate
is based on the pressure of the uid passing through. A pressure gauge installed on the agitation
line gives the operator an indication of total agitation ow. This is especially important for high
application rates where more ow is needed for the boom.
¾A line strainer should be installed on the discharge side of the pump to protect the nozzles from
clogging. If a strainer must be used in front of the pump, a large mesh screen should be used to
lter debris too large to pass through the impeller vanes.
¾The electronic spray control valve and ow-meter should be sized for the desired maximum boom
ow based on the application rate and ground speed.
¾A pressure spike valve is recommended for use with Ace MAX series models. These models operate
at pressures up to 160 psi (11 bar). A pressure spike is generated when the boom is turned off.
The spike valve will relieve the pressure back to tank and prevent damage to system components.
Tank Capacity 5% 10%
3000 liter 150 lpm 300 lpm
4000 liter 200 lpm 400 lpm
5000 liter 250 lpm 500 lpm
8000 liter 400 lpm 800 lpm

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HYDRAULIC SYSTEM CONNECTIONS
The following hydraulic connection recommendations are important for optimum pump efciency and
motor seal life.
1. Hydraulic hoses should be sized to insure proper oil supply to the motor and minimize return line
pressure. Recommended hose sizes are 5/8”(15.9 mm) for M16/M22 motors and 3/4”(19 mm)
for M25/M30 motors. The hoses should be sized larger if individual hose lengths exceed 15 feet
(4.5 m).
2. The return line should be connected to a low pressure return port if available. The low pressure
return port routes oil directly to the reservoir minimizing return line pressure. Low return line
pressure extends the motor seal life and increases operating efciency.
3. 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 prevents the occurrence of damaging pressure spikes.
M SERIES HYDRAULIC MOTOR FEATURES
Coasting Check - This internal feature is standard on 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.
External Motor Fittings
Standard Fittings:
Inlet - Adapter/Restrictor Body (BAC-80-10SAE)............................1/2” NPT Female
Outlet - Reverse Check Valve (BAC-78-10SAE).............................1/2” NPT Female
Optional Fittings (special order):
Inlet - Adapter/Restrictor Body (BAC-80-10X10SAE).......#10 SAE Female
Outlet - Reverse Check Valve (BAC-78-10X10SAE)........#10 SAE Female
Adapter/Restrictor Body - This tting serves as an adapter for hose connection on all systems
and a housing for the restrictor orice for 650 models on PC Closed hydraulic systems.
Reverse Check Valve - The external check valve prevents damage by not allowing the pump
to run backwards. The valve may be removed when used on engineered systems with a single
ow direction.
Motor Ports
M16, M22, and M25
Inlet & Outlet......#10 SAE female
M30
Inlet & Outlet......#10 SAE female
Case Drain.........#6 SAE female Inlet
(marked “I”)
Outlet
Case Drain
(M30 only)
HYDRAULIC MOTOR SEALS
Hydraulic seal failures are typically caused by high continuous pressure or pressure spikes in the
return line. The motor seal is rated for 250 PSI(17.2 bar). Maintaining return line pressures below
100 PSI(6.9 bar) will extend motor seal life. 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 hoses. Consult your tractor dealer for low
pressure return options.
Do not install any hydraulic components in series on the return line of the motor.
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REGULATING HYDRAULIC FLOW TO MOTOR
Warning: Failure to regulate oil ow may damage hydraulic motor.
There are three types of hydraulic systems: 1) Load Sensing (LS) also called Pressure-Flow
Compensating Closed Center, 2) Pressure Compensating Closed Center (PC), and 3) Open Center
(OPEN). 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.
PRESSURE COMPENSATING CLOSED CENTER SYSTEM
LOAD SENSING CLOSED CENTER SYSTEM
Regulate oil ow with tractor’s FLOW CONTROL. (Do not use restrictor orice.)
Setup Instructions:
1. Shut off sprayer boom and agitation valves.
2. Adjust tractor ow control to minimum ow setting (turtle).
3. Move hydraulic lever to “Lower/Retract” position to start pump.
4. Adjust tractor ow control until sprayer shut-off pressure is 4 psi(0.3 bar) for 650
models or 20 psi(1.4 bar) for 750/855 models above desired spraying pressure.
Do not exceed maximum shown in SHUT-OFF PRESSURE section below.
5. Open the sprayer agitation valve to set desired spraying pressure.
Flow Control
Regulate oil ow by using a RESTRICTOR ORIFICE.
Setup Instructions:
1. Install restrictor orice for all 650 models. Insert the orice with O-ring
inside the adapter/restrictor body in the motor inlet port.
Note: Do not use restrictor for 750 and 855 pump models.
2. Set “Rabbit/Turtle” ow control to “Turtle”.
3. Move hydraulic lever to the “Lower/Retract” position to start pump.
4. Adjust “Rabbit /Turtle” ow control and sprayer agitation valve to set
desired spraying pressure.
Insert Restrictor
Orice
OPEN CENTER SYSTEM
The M Series motors are not equipped with a needle valve to bypass excess oil ow. The tractor
hydraulic ow must fall within the motor’s recommended ow range or an external bypass circuit
may be added. The tractor’s hydraulic system may limit pump performance if the oil ow is less
than the motor’s rated capacity.
Select motor size closest to tractor’s hydraulic system capacity.
Consult factory for application of pumps on these systems.
SHUT-OFF PRESSURE
Shut-off pressure is the sprayer system pressure with all liquid 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.
Pump Model Maximum Shutoff Pump Model Maximum Shutoff
FMC-650-HYD 160 psi (11 bar) FMC-750F-HYD 150 psi (10.3 bar)
FMC-650F-HYD 160 psi (11 bar) FMC-855F-HYD 150 psi (10.3 bar)
FMCWS-650F-HYD 160 psi (11 bar)

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WetSeal Technology
O
ASIS
T M
Ace Oasis™ Wet Seal Technology
prevents the pumped liquid from
contacting the shaft seals. The seals
operate in a reservoir lled with a
specially formulated barrier uid for seal
face lubrication and heat dissipation.
Additionally, air pressure is introduced
to prevent pump uid from contaminating the seal reservoir. This isolation of the seals
prevents abrasive wear of the seal faces and run dry seal failures.
The Oasis WetSeal is standard on the FMCWS-650, FMC-750F, and FMC-855F pump
models.
All pumps equipped with the Oasis™ WetSeal have a two year warranty.
PUMP MAINTENANCE
1. MAX series pumps are equipped with lubricated and sealed bearings. No additional bearing
lubrication or maintenance is required.
2. Neutralize chemicals and ush pump after each use to prevent corrosion.
3. If a danger of freezing exists, drain all water from the pump casing by removing the lowest
volute pipe plug. This will prevent casting breakage due to frozen liquid inside the pump.
Note: Do not drain the barrier uid from the seal reservoir on Oasis™ WetSeal models.
Fill Plug
Site Gauge
Air Valve
Drain Plug
Pressure Gauge
Seal Reservoir

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The seal reservoir uid level and pressure must be monitored and maintained to ensure proper
operation of the WetSeal feature.
How to check seal reservoir uid level:
View the site gauge window on the side of the seal reservoir. A oat is included to easily see uid
level.
If the uid is not visible, add uid by following these steps:
• Relieve reservoir air pressure by removing air valve cap and pressing stem.
• Remove ll plug on top of seal reservoir.
• Add barrier uid (Ace Part #55032 - available in quarts) until level is at top edge of site window.
Caution: Do not overll.
• Replace ll plug and recharge air pressure per instructions below.
How to check seal reservoir pressure:
The reservoir pressure gauge gives a direct pressure reading. Pressure should remain within the
green zone during operation. The recommended cold reservoir pressure is 25 to 30 psi.
Note: Pressure will increase during operation as the uid is heated.
Steps to pressurize seal reservoir:
• Verify that ll and drain plugs are installed and tight.
• Remove air valve cap.
• Add air until gauge reads 25 to 30 psi. An air supply or tank regulated to 30 psi(2 bar) is best.
Caution: Do not over pressurize. Relieve excess air pressure if necessary.
• Replace air valve cap.
Maintenance Intervals:
Initial Startup: Verify correct reservoir uid level and pressure prior to startup.
Daily: Check reservoir pressure.
If air must be added regularly, spray soapy water around plugs, seams, and ttings
of seal plate to check for leakage. Reseal as needed. If no external leak is found,
installation of a seal kit should be scheduled for next machine downtime.
Weekly: Check barrier uid level. A small amount of barrier uid will be consumed under normal
operating conditions.
If the barrier uid appears cloudy or discolored in site gauge, drain until uid runs
clear, rell with clean uid, and recharge pressure. Check again in one week. If uid
is cloudy or discolored again, this is an indication of inboard seal leakage. A seal kit
installation should be scheduled for next machine downtime.
Season End: Remove drain plug and drain barrier uid from the reservoir into a clean bucket.
1) If the uid is clear: reinstall plug, rell with barrier uid, and recharge air pressure.
2) If the uid is cloudy, discolored, or contains water: This could be the indication that
a seal leak is developing. Installation of a seal kit is recommended to ensure trouble
free operation for the next season.
WINTERIZING AND STORAGE
1. Flush pump thoroughly and neutralize chemicals to prevent corrosion.
2. Fill pump with recreational vehicle antifreeze to protect from corrosion and freezing.
3. If equipped with Oasis™ WetSeal, see Season End maintenance above.
4. If removing hydraulic hoses, insert plugs in motor ports to retain uid and prevent contamination.
OASIS™WETSEAL MAINTENANCE

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1. Remove (2) socket head motor screws and washers with 5/16” hex wrench.
2. Remove hydraulic motor.
Note: Tap with a non-marring hammer if necessary.
Alternate method: a) rotate motor slightly positioning ange ears in front of bolt holes b) install
(2) motor screws in motor mount holes from opposite direction and tighten by hand until snug c)
tighten screws with wrench using an alternating pattern of one turn each until separated.
3. Remove snap ring from behind rear pump bearing.
4. Remove (8) volute cap screws with 9/16” wrench.
5. Remove volute and O-ring.
6. Remove stainless impeller cap screw with 9/16” socket and discard sealing washer.
Note: Turn counterclockwise to remove
7. Remove impeller and key from shaft.
8. Slide rotating seal assembly with spring off of shaft and discard.
Note: Observe seal orientation for installation of new seal.
9. Install impeller cap screw in shaft end to protect threaded hole.
10. Press or tap (non-marring hammer) shaft/bearing assembly from impeller end until clear of
stationary seal face in mounting frame.
11. Use a screw driver to pry stationary seal face from seal bore.
Note: If replacing shaft seal only - skip to Assembly Instructions step 5.
12. Press or tap shaft/bearing assembly out of frame.
13. Remove slinger and impeller cap screw from shaft.
14. Use a press to remove bearings from shaft.
Press bearings off each end of shaft.
Frame
Shaft/BearingAssy.
Motor
Volute Cap Screw (8)
Volute Impeller
O-ring
DISASSEMBLY INSTRUCTIONS
FMC-650-HYD REPAIR
Ace pump repair kits include all shaft seals and O-rings required to
repair the pump.
Pump Model Standard Seal Severe Duty Seal
FMC-650(F)(FS)-HYD Series RK-FMC-650 RK-FMCSC-650
Shaft Seal Only EDP# Recommended For
BAC-7-650 40145 water and general ag chemicals
BAC-7SC-650 40146 abrasive chemicals and fertilizers
BAC-7-650B 40144 water and aqua ammonia
REPAIR KITS & SEALS
Pad
O-ring
Liner (FS Model)
Liner O-ring

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ASSEMBLY INSTRUCTIONS
1. Install front snap ring into mounting frame bearing bore.
2. Press bearings onto shaft. Press one from each end until seated against step on shaft.
3. Install slinger over impeller end of shaft and push to bearing.
4. Set shaft/bearing assembly aside.
5. Stand mounting frame on motor mount ange with seal bore pointing up.
6. Clean and inspect mounting frame seal bore for gouges that may prevent proper sealing.
7. Push stationary seal face into mounting frame seal bore by hand.
Important: Avoid touching seal face by covering it with a soft, clean cloth during installation.
Seal Orientation: Polished seal surface should face up with grooved side towards bearing
bore. (See illustration below)
Lubrication: Soapy water may be used on O-ring to aid installation.
8. Press or tap shaft/bearing assembly into mounting frame from motor ange end.
Note: Use a non-marring hammer and soft wood block to prevent shaft or spline damage.
9. Install rear snap ring into mounting frame bearing bore.
10. Place seal installation tool over shaft. Push rotating seal assembly over tool and shaft by
hand until black polished face seats against stationary face in mounting frame. Remove seal
installation tool. (See illustration below)
Note: Avoid touching the seal face.
Lubrication: Soapy water may be used on rotating assembly bellows, shaft and installation
tool to aid installation.
11. Insert key in keyway and apply anti-seize compound to impeller seat area and key.
12. Install impeller on shaft.
13. Install new sealing washer on stainless impeller cap screw and apply nut lock on screw threads.
14. Install impeller cap screw with sealing washer and tighten to 20 ft-lb (27 N-m).
15. Install volute seal O-ring over boss on mounting frame. Stretch O-ring over boss - do not roll.
16. Install volute.
17. Apply nut lock to (8) volute cap screws, install, and tighten to 20 ft-lb (27 N-m). Allow nut lock to
cure for a minimum of 10 minutes before lling pump.
18. Apply high speed coupling grease to internal splines of pump shaft.
19. Install O-ring on motor ange boss and position pad over shaft.
20. Install motor aligning shaft splines with pump shaft.
21. Install (2) motor socket head cap screws with washers and tighten to 20 ft-lb (27 N-m).
Step 7 Step 10

12
1. Mark orientation of volute, seal plate, frame, and motor to assist in reassembly.
2. Remove (2) socket head motor screws and washers with 5/16” hex wrench.
3. Remove hydraulic motor.
Note: Tap with a non-marring hammer if necessary. See page 10 step 2 for alternate method.
4. Remove snap ring from behind rear pump bearing.
5. Remove cap from air ll valve and press stem to release reservoir pressure.
6. Remove hex drain plug with 7/8” wrench and drain barrier uid into a clean pan.
Note: Recycle or dispose of used uid the same as motor oil.
7. Remove (4) volute hex head cap screws with 9/16” wrench.
8. Remove volute and O-ring.
9. Remove stainless impeller cap screw with 9/16” socket and discard sealing washer.
Note: Turn counterclockwise to remove
10. Remove impeller and key from shaft.
11. Remove (4) socket head seal plate cap screws with 5/16” hex wrench.
12. Remove seal plate slowly and place shop towel over shaft end for protection. Remove O-ring.
Danger: Compression of seal spring may cause part of seal to y off without warning.
13. Slide rotating seal assembly ((2) seal faces and (1) spring) off shaft and discard.
14. Install impeller cap screw in shaft end to protect threaded hole.
15. Press or tap (non-marring hammer) shaft/bearing assembly from impeller end until clear of
stationary seal face in mounting frame.
16. Use a screw driver to pry stationary seal seats from frame and seal plate.
Note: If replacing shaft seal only - skip to Assembly Instructions step 8.
17. Continue to press or tap shaft/bearing assembly out of frame towards motor end.
18. Remove slinger from shaft.
19. Remove snap ring from shaft on impeller side of front pump bearing.
20. Use a press to remove bearings from shaft. Press bearings off each end of shaft.
21. Remove shaft spacer.
DISASSEMBLY INSTRUCTIONS
WetSeal Technology
OASIS
T M
Ace pump Oasis WetSeal repair kits include a dual shaft seal, O-rings,
and barrier uid to rell the seal reservoir.
Pump Model Repair Kit EDP#
FMCWS-650F(FS)-HYD Series RK-FMCWS-650 52722
Shaft Seal Only EDP# Recommended For
BAC-7-650-WS 40143 all materials and applications
Frame
Shaft/BearingAssy. Motor
Drain Plug
Volute Cap Screw (4)
Seal Plate Cap Screw (4)
Volute Impeller Seal Plate
O-ring
O-ring Rotating SealAssy.
Stationary
Seal Seats
FMCWS-650-HYD REPAIR
REPAIR KIT & SEAL
Pad
O-ring

13
1. Install snap ring on shaft into second groove from impeller end.
2. Press bearing onto shaft from impeller end until seated against snap ring.
3. Install snap ring in groove on opposite side of bearing.
4. Install slinger on shaft over threaded end and push to step on shaft.
5. Place spacer over shaft from splined end and press rear bearing on until seated against spacer.
6. Set aside shaft/bearing assembly.
7. Install front snap ring into mounting frame bearing bore.
8. Clean and inspect seal bores on mounting frame and seal plate. Bore damage or gouges may
prevent proper sealing.
9. Install stationary seal seats:
Important: Avoid touching seal faces by covering with a soft, clean
cloth.
Lubrication: Lightly oil O-ring with clean barrier uid to aid installation.
A. Push a seal seat by hand into mounting frame seal bore with
grooved side towards bore.
B. Push a seal seat into seal plate seal bore by hand with grooved side
towards bore.
10. Press or tap shaft/bearing assembly into mounting frame from rear
motor ange.
Note: Use a non-marring hammer and soft wood block to prevent shaft or spline damage.
11. Install rear snap ring into mounting frame bearing bore.
12. Stand mounting frame/shaft assembly on motor mount ange with shaft pointing up.
13. Place seal installation tool over shaft and install rotating seal faces:
Important: Avoid touching seal faces.
Lubrication: Lightly oil rotating assembly bellows, shaft, and installation
tool with clean barrier uid to aid installation.
A. Push rst rotating seal assembly over shaft by hand until black polished
face seats against stationary face in mounting frame.
B. Place spring on shaft above rst rotating seal assembly.
C. Push second rotating seal assembly over shaft by hand until metal
seal cup seats against spring. Polished black seal face should be up
towards impeller. Remove seal installation tool.
14. Install seal plate O-ring over boss on mounting frame. Stretch O-ring over
boss – do not roll.
15. Install seal plate and tighten (4) socket head cap screws to 20 ft-lb (27
N-m).
16. Insert key in keyway and apply anti-seize compound to impeller seat area
and key.
17. Install impeller on shaft.
18. Install new sealing washer on stainless impeller cap screw and apply nut lock on screw threads.
19. Install impeller cap screw with sealing washer and tighten to 20 ft-lb (27 N-m).
20. Install volute seal O-ring over boss on seal plate. Stretch O-ring over boss – do not roll.
21. Install volute.
22. Apply nut lock to (4) volute cap screws, install, and tighten to 20 ft-lb (27 N-m). Allow nut lock to
cure for a minimum of 10 minutes before lling pump.
23. Apply high speed coupling grease to internal splines of pump shaft.
24. Install O-ring on motor ange boss and position pad over shaft.
25. Install motor aligning shaft splines with pump shaft.
26. Install motor socket head cap screws with washers and tighten to 20 ft-lb (27 N-m).
27. Place pump on a level surface then follow barrier uid ll and pressurization instructions(page 9).
ASSEMBLY INSTRUCTIONS
Step 9
Step 13

14
1. Mark orientation of volute, seal plate, frame, and motor to assist in reassembly.
2. Remove (2) socket head motor screws and washers with 5/16” hex wrench.
3. Remove hydraulic motor.
Note: Tap with a non-marring hammer if necessary. See page 10 step 2 for alternate method.
4. Remove snap ring from behind rear pump bearing.
5. Remove cap from air ll valve and press stem to release reservoir pressure.
6. Remove hex drain plug with 7/8” wrench and drain barrier uid into a clean pan.
Note: Recycle or dispose of used uid the same as motor oil.
7. Remove (4) volute hex head cap screws and spacers with a 9/16” wrench.
8. Remove volute and O-ring.
9. Remove impeller acorn nut with a 1” socket.
Note: Turn counterclockwise to remove. Insert a at le into an impeller vane to hold stationary.
10. Remove impeller and key from shaft.
11. Remove (4) socket head seal plate cap screws with 5/16” hex wrench.
Note: Two screws were used on early models.
12. Remove seal plate slowly and place shop towel over shaft end for protection. Remove O-ring.
Danger: Compression of seal spring may cause part of seal to y off without warning.
13. Slide rotating seal assembly ((2) seal faces and (1) spring) off shaft and discard.
14. Install impeller nut on shaft end to protect threads.
15. Press or tap (non-marring hammer) shaft/bearing assembly from impeller end until clear of
stationary seal face in mounting frame.
16. Use a screw driver to pry stationary seal seats from frame and seal plate.
Note: If replacing shaft seal only - skip to Assembly Instructions step 8.
17. Continue to press or tap shaft/bearing assembly out of frame towards motor end.
18. Remove slinger from shaft.
19. Remove snap ring from shaft on impeller side of front pump bearing.
20. Use a press to remove bearings from shaft. Press bearings off each end of shaft.
21. Remove shaft spacer.
DISASSEMBLY INSTRUCTIONS
Ace pump Oasis WetSeal repair kits include a dual shaft seal, O-rings,
and barrier uid to rell the seal reservoir.
Pump Model Repair Kit EDP#
FMC-750F-HYD Series RK-FMC-750 52724
Shaft Seal Only EDP# Recommended For
BAC-7-750V 40147 all materials and applications
WetSeal Technology
OASIS
T M
Frame
Shaft/BearingAssy. Motor
Drain Plug
Volute Cap Screw (4)
Seal Plate Cap Screw (4)
Volute Impeller Seal Plate
O-ring
Spacer (4) Rotating SealAssy.
Stationary
Seal Seats
FMC-750F-HYD REPAIR
REPAIR KIT & SEAL
Pad
O-ring

15
ASSEMBLY INSTRUCTIONS
1. Install snap ring on shaft into second groove from impeller end.
2. Press bearing onto shaft from threaded end until seated against snap ring.
3. Install snap ring in groove on opposite side of bearing.
4. Install slinger on shaft over threaded end and push to snap ring.
5. Place spacer over shaft from splined end and press rear bearing on until seated against spacer.
6. Set aside shaft/bearing assembly.
7. Install front snap ring into mounting frame bearing bore.
8. Clean and inspect seal bores on mounting frame and seal plate. Bore damage or gouges may
prevent proper sealing.
9. Install stationary seal seats:
Important: Avoid touching seal faces by covering with a soft, clean cloth.
Lubrication: Lightly oil O-ring with clean barrier uid to aid installation.
A. Push a seal seat by hand into mounting frame seal bore with grooved
side towards bore.
B. Push a seal seat into seal plate seal bore by hand with grooved side
towards bore.
10. Press or tap shaft/bearing assembly into mounting frame from rear motor
ange.
Note: Use a non-marring hammer and soft wood block to prevent shaft or
spline damage.
11. Install rear snap ring into mounting frame bearing bore.
12. Stand mounting frame/shaft assembly on motor mount ange with shaft pointing up.
13. Install rotating seal faces:
Important: Avoid touching seal faces.
Lubrication: Lightly oil rotating assembly bellows and shaft with barrier
uid to aid installation.
A. Push rst rotating seal assembly over shaft by hand until black
polished face seats against stationary face in mounting frame.
B. Place spring on shaft above rst rotating seal assembly.
C. Push second rotating seal assembly over shaft by hand until metal
seal cup seats against spring. Polished black seal face should be up
towards impeller.
14. Install seal plate O-ring over boss on mounting frame. Stretch O-ring over
boss – do not roll.
15. Install seal plate and tighten (2) or (4) socket head cap screws to 20 ft-lb
(27 N-m).
16. Insert key in keyway and apply anti-seize compound to impeller seat area
and key.
17. Install impeller on shaft and apply nut lock to threaded shaft end.
18. Install acorn nut and tighten to 70 ft-lb (95 N-m).
19. Install volute seal O-ring over boss on seal plate. Stretch O-ring over boss – do not roll.
20. Install volute
21. Apply nut lock to (4) volute cap screws, install, and tighten to 20 ft-lb (27 N-m). Allow nut lock to
cure for a minimum of 10 minutes before lling pump.
Note: Place a at washer under volute cap screw at pump discharge port.
22. Apply high speed coupling grease to internal splines of pump shaft.
23. Install O-ring on motor ange boss and position pad over shaft.
24. Install motor aligning shaft splines with pump shaft.
25. Install motor socket head cap screws with washers and tighten to 20 ft-lb (27 N-m).
26. Place pump on a level surface then follow barrier uid ll and pressurization instructions(page 9).
Step 9
Step 13

16
1. Mark orientation of volute, seal plate, frame, and motor to assist in reassembly.
2. Remove (2) socket head motor screws and washers with 5/16” hex wrench.
3. Remove hydraulic motor.
Note: Tap with a non-marring hammer if necessary. See page 10 step 2 for alternate method.
4. Remove cap from air ll valve and press stem to release reservoir pressure.
5. Remove hex drain plug with 7/8” wrench and drain barrier uid into a clean pan.
Note: Recycle or dispose of used uid the same as motor oil.
6. Remove (8) volute hex head cap screws with a 9/16” wrench.
7. Remove volute and O-ring.
8. Remove impeller acorn nut with a 1” socket.
Note: Turn counterclockwise to remove. Insert a at le into an impeller vane to hold stationary.
9. Remove impeller and key from shaft.
10. Remove (4) socket head seal plate cap screws with 5/16” hex wrench.
11. Remove seal plate slowly and place shop towel over shaft end for protection. Remove O-ring.
Danger: Compression of seal spring may cause part of seal to y off without warning.
12. Slide rotating seal assembly ((2) seal faces and (1) spring) off shaft and discard.
13. Install impeller nut on shaft end to protect threads.
14. Press or tap (non-marring hammer) shaft/bearing assembly from impeller end until clear of
stationary seal face in mounting frame.
15. Use a screw driver to pry stationary seal seats from frame and seal plate.
Note: If replacing shaft seal only - skip to Assembly Instructions step 8.
16. Continue to press or tap shaft/bearing assembly out of frame towards motor end.
17. Remove slinger from shaft.
18. Remove (2) outer bearing snap rings.
19. Press each bearing off the shaft from center towards the respective end.
DISASSEMBLY INSTRUCTIONS
Ace pump Oasis WetSeal repair kits include a dual shaft seal, O-rings,
and barrier uid to rell the seal reservoir.
Pump Model Repair Kit EDP#
FMC-855F-HYD Series RK-FMC-855 52726
Shaft Seal Only EDP# Recommended For
BAC-7-850V 40148 all materials and applications
WetSeal Technology
OASIS
T M
Frame
Shaft/BearingAssy. Motor
Drain Plug
Volute Cap Screw (8)
Seal Plate Cap Screw (4)
Volute Impeller Seal Plate
O-ring
Rotating SealAssy.
Stationary
Seal Seats
FMC-855F-HYD REPAIR
REPAIR KIT & SEAL
Pad
O-ring

17
ASSEMBLY INSTRUCTIONS
1. Install snap rings on shaft into second and third grooves.
2. Press rear bearing (large) onto shaft from splined end until seated against snap ring.
3. Install snap ring in groove on opposite side of bearing.
4. Press front bearing (small) onto shaft from threaded end until seated against snap ring.
5. Install snap ring in groove on opposite side of bearing.
6. Install slinger on shaft over threaded end and push until 1/4” from front bearing.
7. Set aside shaft/bearing assembly.
8. Clean and inspect seal bores on mounting frame and seal plate. Bore damage or gouges may
prevent proper sealing.
9. Install stationary seal seats:
Important: Avoid touching seal faces by covering with a soft, clean
cloth.
Lubrication: Lightly oil O-ring with clean barrier uid to aid
installation.
A. Push a seal seat by hand into mounting frame seal bore with
grooved side towards bore.
B. Push a seal seat into seal plate seal bore by hand with grooved
side towards bore.
10. Press or tap shaft/bearing assembly into mounting frame from rear
motor ange.
Note: Use a non-marring hammer and soft wood block to prevent shaft or spline damage.
11. Stand mounting frame/shaft assembly on motor mount ange with shaft pointing up.
12. Install rotating seal faces:
Important: Avoid touching seal faces.
Lubrication: Lightly oil rotating assembly bellows and shaft with
barrier uid to aid installation.
A. Push rst rotating seal assembly over shaft by hand until black
polished face seats against stationary face in mounting frame.
B. Place spring on shaft above rst rotating seal assembly.
C. Push second rotating seal assembly over shaft by hand until metal
seal cup seats against spring. Polished black seal face should be
up towards impeller.
13. Install seal plate O-ring over boss on mounting frame. Stretch O-ring
over boss – do not roll.
14. Install seal plate and tighten (4) socket head cap screws to 20 ft-lb (27
N-m).
15. Insert key in keyway and apply anti-seize compound to impeller seat
area and key.
16. Install impeller on shaft.
17. Apply nut lock to threaded shaft end.
18. Install acorn nut and tighten to 70 ft-lb (95 N-m).
19. Install volute seal O-ring over boss on seal plate. Stretch O-ring over boss – do not roll.
20. Install volute.
21. Apply nut lock to (8) volute cap screws, install, and tighten to 20 ft-lb (27 N-m). Allow nut lock to
cure for a minimum of 10 minutes before lling pump.
22. Install O-ring on motor ange boss and position pad over shaft.
23. Apply high speed coupling grease to internal splines of pump shaft.
24. Install motor aligning shaft splines with pump shaft.
25. Install motor socket head cap screws with washers and tighten to 20 ft-lb (27 N-m).
26. Place pump on a level surface then follow barrier uid ll and pressurization instructions(page 9).
Step 9
Step 13

18
↓
MOTOR SHAFT SEAL REPLACEMENT
HYDRAULIC MOTOR REPAIR KITS
Ace M Series hydraulic motors are high efciency pressure balanced gear motors. The high efciency
design prevents replacement of some motor parts if damaged. See Ace Form # HYD-M SERIES for
a listing of available replacement parts. The most common replacement part is the shaft seal which
is listed in the table below for each motor model.
Ace Motor Model Used on Pump Models Repair Kit Ace EDP#
BAC-75-HYD-M16 FMC-650... & FMCWS-650... RK-BAC-75-M 40138
BAC-75-HYD-M22 FMC-750F... RK-BAC-75-M 40138
BAC-75-HYD-M25 FMC-750F... RK-BAC-75-M 40138
BAC-75-HYD-M30 FMC-850F..., FMC-855F..., all -CD BAC-75-M-FKM 40164
↑
↑
Step 10
↓
Step 6
Step 4
DISASSEMBLY:
1. Wipe the motor with a clean cloth to remove dirt which could
contaminate the motor.
2. Note port locations then remove hoses and external ttings.
3. Mark the motor section joints to indicate orientation of the motor
components.
4. Remove (4) motor assembly cap screws. Motors with hex head cap
screws require a 17 mm socket. Motors with socket head cap screws
require a 9.5 mm or 3/8” hex key wrench.
5. Set motor on rear cover with shaft pointing up.
6. Remove front motor ange by pressing thumbs against shaft end while
pulling up with ngers behind ange ears. Take care to not disturb the
other motor components.
7. Remove the housing seal O-ring and discard the old ange assembly.
Inspect the motor shaft for grooving or scoring. Moderate to severe
damage in the sealing area may prevent proper sealing and require
motor replacement.
ASSEMBLY: (Note: Do not remove paper tube from seal.)
8. Place seal installation tool over splined shaft end. Lubricate the tool
and seal lips with clean oil.
9. Lightly grease housing seal O-ring and place into groove on rear of
new ange.
10. Carefully place new ange/seal assembly over installation tool and
press down slowly to body. The tool will push the paper tube out.
Note: Take care to hold the ange level and push evenly on both sides
of the ange.
11. Discard seal installation tool and paper tube.
12. Reinstall motor assembly bolts and tighten to 33 ft-lb (45 N-m) torque.
Turn the shaft by hand to ensure the motor turns freely.
13. Reinstall external motor ttings.
Step 8
Step 11
A new motor seal was implemented in June 2015 for the RK-BAC-75-M kit.
Please refer to Ace Pump Product Update 19 for complete details.
A video of the seal replacement process is available here: www.youtube.com/user/acepump
↓
↑
↑

19
MOTOR DISASSEMBLY & REASSEMBLY
1. Mark motor prior to disassembly at each section joint as
shown in the diagram. These marks will serve as guides to
reassemble motor components in original positions.
2. Remove 4 motor assembly bolts. Motors with socket head
cap screws require a 9.5 mm or 3/8” hex wrench. Motors
with hex head cap screws require a 17mm socket.
3. Take motor apart as shown in diagram below.
Important: Remember orientation and location of all parts.
Lay parts on a clean cloth in proper orientation during
disassembly.
marking lines
cover
body flange
idler shaft
rear bushing drive shaft front bushing
4. Replace seals, O-rings, and components as needed.
5. Reassemble cover, shafts, bushings, and body in their original positions. Use alignment pins
and marked lines for reference.
Note: All components must be reinstalled exactly as they were for proper motor function.
6. Set assembly on back cover with shaft pointing up.
7. Go to step 4 on the previous page for instructions on replacing shaft seal and completing
reassembly.
HYDRAULIC MOTOR SEALS
Hydraulic seal failures are typically caused by high continuous pressure or pressure spikes in the
return line. The motor seal is rated for 250 PSI(17.2 bar). Maintaining return line pressures below
100 PSI(6.9 bar) will extend motor seal life. 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 hoses. Consult your tractor dealer for low
pressure return options.
Do not install any hydraulic components in series on the return line of the motor.

20
Ace Pump Corporation P.O. Box 13187 - 1650 Channel Avenue Memphis, TN 38113
www.AcePumps.com Phone: [phone] Fax: [phone]
Ace Form # HYD-MAN MAX
Revised 12/16
STANDARD WARRANTY
Ace pumps and valves are guaranteed against defects in material and workmanship for a
period of one year from date of installation. The warranty period is two years for pumps
equipped with Oasis™ WetSeal Technology which requires proper maintenance of the
seal chamber by the user as directed in the Instruction Manual. 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
All seals are covered against defects in materials or workmanship. Seal failures resulting
fromapplicationrelatedconditionsarenotcovered. Mostsealfailuresareduetoapplication
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.
Repair requests under the above category 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.