Groundsmaster 4300--DHydraulic System Page 4 -- 44
Relief Valve (PRV1) and (PRV2) Pressure Test
Figure 45
GEAR
PUMP
CROSSTRAX
MANIFOLD
BYPASS
PISTON
(TRACTION)
PUMP
DECK
CONTROL
MANIFOLD
VALVE
FROM STEERING CONTROLVALVE
RELIEF VALVE (PRV1)
TEST SHOWN
FROM LIFT CONTROL MANIFOLD
TO LIFT CONTROL MANIFOLD
TO STEERING CONTROL VALVE AND CHARGE CIRCUIT
TESTER
ROTATION
DIRECTION
MOTOR
OUTLET
MOTOR
INLET
CASE DRAIN
The relief valve (PRV1) and (PRV2) pressure test
should be performed to make sure that the cutting deck
circuit relief pressures are correct.
NOTE: Thefrontcuttingdeckcircuit isprotected by pro-
portional relief valve (PRV2) in the deck control man-
ifold. The rear cutting deck circuit is protected by
proportional relief valve (PRV1) (see Hydraulic Flow
Diagrams in this chapter).
Procedure for Relief Valve (PRV1) and (PRV2)
Pres-
sure
Test
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine under load for
approximately ten (10) minutes.
2. Park machine on a level surface with the cutting
decks lowered and PTO switch off. Make sure engine is
off and mow speed limiter is in the mow position. Apply
the parking brake.
