Hydraulic Control Valve

TM 10-3930-631-12

4-51. Hydraulic Pump

a. Remove the floor and toe plates and drip pan to

gain access to hydraulic pump.

b. Check pump and motor for secure mounting.

Inspect pump and hose connections for

evidence of leaks. Tighten connections if necessary.

Replace leaking or deteriorated hoses.

d. Install drip pan and floor and toe plates.

4-52. Hydraulic Control Valve

a. Remove cover from right side below seat to

gain access to control valve.

Move levers and check for freedom of

operation in valve.

c. Check hose and tube connections to valve for

leaks. Inspect hoses for leakage and deterioration.

Replace hoses if necessary.

4-53. Control Levers and Linkage

a. General. Three control levers, connected to the

control valve by linkages, actuate the lift, tilt and side

shift cylinders. Movement of the levers opens ports in

the valve to allow hydraulic pressure to flow to the

cylinders. Two switches normally open, are mounted on

brackets behind the control rods. When a control lever is

moved, the actuator contacts and closes the switch and

starts the hydraulic pump motor. Remove sheet metal

cover to gain access to linkage.

b. Lever Adjustment. Refer to figure 4-36 and

adjust linkage as follows:

Figure 4-36. Hydraulic valve linkage.

4-44