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Greensmaster 3150 Hydraulic SystemPage 4 -- 65
For repair of the piston pump, see Eaton, Medium Duty
Piston Pump, Repair Information, Model 70 160 Variable
Displacement Piston Pump at t he end of this chapter.
NOTE: The charge relief valve is attached to the piston
pump back plate (shownin Fig.47). Theback platemust
be removed to service t he relief valve.
NOTE: The piston pump is equipped with relief valves
(items 18 and 41) for both the forward and reverse direc-
tion. Due to engine output, it is unlikely thattraction pres-
sure will reach relief valve settings. If, however, a piston
pump relief valve is leaking or otherwise faulty, traction
performance would be affected.
IMPORTANT: Theshim kit(item 7) isused toreplace
the original c rush ring(not shown)in thecover plate
(item 25). If the swash plate (item 10), cover plate
(item 25) orhousing (item 29) is replaced during ser-
vicing, the old crush ring must be replaced. For in-
formation on crush ring replacement, 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
CHARGE RELIEF
1
2
8
VALVE
4
5
6
7
3
Figure 47
Hydraulic
System