4-17.1 Hydraulic Pump Repair (Typical - All Wheel Assembly Models) - Continued
a. Thoroughly clean exterior and interior of pump body (21), using dry cleaning solvent (item 6, Appendix D).
Inspect to verify serviceability and replace pump body if defective.
b. Clean all removed components that are to be reinstalled. Inspect to verify serviceability and replace
components if defective.
3. Assemble hydraulic pump, using new parts from repair kit 300487.
a. Install hydraulic fitting guard (39) on pump body with bolt (40) and nut (41).
b. Install mounting plate (38) on pump body with bolt (40) and NUT (41).
c. Install steel ball (20). Install compression spring (19) in spacer (18) and install into pump body Install steel
ball (11), compression spring (17), copper washer (16), and valve screw (5). Torque to 300/370 Inch pounds.
d. Install metering valve (7) in pump body (21), pipe bushing (6) in metering valve (7), and pipe plug (35)
and O-Ring (34) in pipe bushing (6). Use Teflon Tape (item 8, Appendix D).
e. Install ball (12), safety release valve (13), nylon ball (33), O-Ring (14), backup washer (15), in pump body
f. Install safety release valve knob (26) and tighten setscrew (25).
The pressure relief valve is factory set in the range of 8300 to 8800 psi. If pressure is outside
this range during test in B below, the pump must be disassembled and the pressure relief
g. Install pressure relief valve (22) in pump body (21).
h. Install stick filter (23) and O-Ring (34) (as an assemble) in pump body (21).
i. Install tie rod (28) in pump body (21); seat O-Ring (24) and reservoir assembly (27) in pump body and
attach with nut (31). Torque to 250 inch pounds j. Fill reservoir assembly (27) with hydraulic fluid (item 1,
Appendix D) and install gasket (30) and dust protective cap (29).
k. Drop ball (11) in top hole of pump body (21).
I. Install O-Ring (10), backup washer (9), and piston assembly (8) in top hole of pump body (21).
m. Attach handle assembly (3) to pump body (21), by installing two straight pins (2) and four retaining rings
B. TEST HYDRAULIC PUMP
The pressure relief valve is inside the hydraulic pump. If unloading pressure is incorrect
during test, the pump must be disassembled to replace pressure relief valve.
1. Testing Hydraulic Pump.
a. Fill hydraulic pump reservoir to proper level with hydraulic fluid (item 1, Appendix D).
b. Connect a 10,000 psi gage to outlet hole in the end of the pump.
c. Operate the pump until pressure builds up and pressure relief valve unloads between 8300 to 8800 psi.
d. If setting incorrect, disassemble pump and replace pressure relief valve.
END OF TASK