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Hydraulic Motor Rebuild
Removal
This equipment stays pressurized until pressure is
manually relieved. To help prevent serious injury from
pressurized fluid, such as skin injection, splashing
fluid and moving parts, follow the Pressure Relief Pro-
cedure when you stop spraying and before cleaning,
checking, or servicing the equipment.
1. Perform Pressure Relief Procedure, page 9.
2. Place drip pan or rags under sprayer to catch
hydraulic oil that leaks out during repair.
3. Remove Displacement Pump, page 26.
4. Remove hydraulic lines (271, 288) from fittings (226)
at top left and right side of hydraulic motor.
5. Loosen jam nut (264).
6. Unscrew and remove hydraulic motor cap (265).
7. Slide piston rod/hydraulic motor cap assembly (A)
from hydraulic motor cylinder (263).
3A2247A
Installation
FLYING PARTS HAZARD
Detent spring has high energy potential. If detent
spring is released without due care detent spring
and balls could fly into the eyes of the disassembler.
Wear safety glasses when removing or installing
detent spring and balls. Failure to wear safety
glasses when removing detent spring could result in
eye injury or blindness.
1. Slide piston rod assembly (A) into hydraulic motor
cylinder (263).
2. Screw down hydraulic motor cap (268). Unscrew
hydraulic motor cap until inlet and outlet align with
hydraulic line fittings and test hole in hydraulic motor
cap points toward belt guard (117).
3. Torque jam nut (264) against hydraulic motor cap
(268) to 150 ft-lb (17 N•m).
4. Install hydraulic lines (271, 288) to fittings (226) to
top left and right side of hydraulic motor; torque to
40 ft-lb (54.2 N•m).
5. Do Displacement Pump, Installation, page 27.
6. Start engine and operate pump for 30 seconds. Turn
engine OFF. Check hydraulic oil level and fill with
Graco hydraulic oil, page 25.
Hydraulic Motor Rebuild
23
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