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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 flywheel effect of the impeller when the pump is
turned off.
Motor Ports
M16, M22, and M25
Inlet & Outlet......#10 SAE female
M30
Inlet & Outlet......#10 SAE female
Case Drain.........#6 SAE female
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 fitting serves as an adapter for hose connection on all systems
and a housing for the restrictor orifice 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
flow direction.
HYDRAULIC SYSTEM CONNECTIONS
The following hydraulic connection recommendations are important for optimum pump efficiency 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 efficiency.
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.
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.
Outlet
6
I
Inlet
(marked "I")
Case Drain
(M30 only)
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