Toro Greensmaster TriFlex 3320/3420 Service Manual page 115

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. 43). 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 swash plate (item 10), cover plate
(item 25) or housing (item 29) is replaced during ser-
vicing, the old crush ring must be replaced. See Pis-
ton Pump Crush Ring Replacement in this section
in conjunction with the piston pump service manual
at the end of this chapter.
Greensmaster 3320/3420
2
CHARGE RELIEF
VALVE
6
8 7
1. Back plate
2. Charge relief valve
3. O- -ring
4. Housing
Page 5 - - 61
3
4
5
Figure 43
5. Poppet
6. Spring
7. Washer
8. Retaining ring
Hydraulic System
1