Service Manual

Greensmaster 3300/3400 Hydraulic SystemPage 5 − 71

For repair of the piston (traction) pump, see Eaton, Me-

dium Duty Piston Pump, Repair Information, Model

70160 Variable Displacement Piston Pump at the end of

this chapter.

NOTE: The charge relief valve is attached to the piston

pump back plate (Fig. 49). The back plate must be re-

moved to service the relief valve.

NOTE: The piston (traction) pump is equipped with re-

lief valves for both the forward and reverse direction.

Due to engine output, it is unlikely that traction pressure

will reach relief valve settings. If, however, a pump relief

valve is leaking or otherwise faulty, traction performance

would be affected.

IMPORTANT: The shim kit (item 7) is used to replace

the original crush ring (not shown) in the cover plate

(item 25). If the camplate (item 10), cover plate (item

25) or housing (item 29) is replaced during servic-

ing, the old crush ring must be replaced. See Piston

Pump Crush Ring Replacement in this section in

conjunction with the piston pump service manual at

the end of this chapter.

1. Back plate

2. Charge relief valve

3. O−ring

4. Housing

5. Poppet

6. Spring

7. Washer

8. Retaining ring

Figure 49

CHARGE RELIEF

VALVE

Hydraulic

System