Toro Greensmaster 3150 Service Manual page 93

For repair of the piston pump, see Eaton, Medium 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 (shown in Fig. 47). The back plate must
be removed to service the 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 that traction 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: The shim kit (item 7) is used to replace
the original crush ring (not shown) in the cover plate
(item 25). If the swash plate (item 10), cover plate
(item 25) or housing (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.
Greensmaster 3150
2
CHARGE RELIEF
VALVE
6
8 7
1. Back plate
2. Charge relief valve
3. O- -ring
4. Housing
Page 4 - - 65
3
4
5
Figure 47
5. Poppet
6. Spring
7. Washer
8. Retaining ring
Hydraulic System
1