Relief Valve (Prv1) And (Prv2) Pressure Test - Toro GroundsmasterR 4300-D Service Manual

Relief Valve (PRV1) and (PRV2) Pressure Test

PISTON
(TRACTION)
PUMP
The relief valve (PRV1) and (PRV2) pressure test
should be performed to make sure that the cutting deck
circuit relief pressures are correct.
NOTE: The front cutting deck circuit is protected 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).
Hydraulic System
TO STEERING CONTROL VALVE AND CHARGE CIRCUIT
TO LIFT CONTROL MANIFOLD
GEAR
PUMP
BYPASS
VALVE
FROM STEERING CONTROL VALVE
DECK
CONTROL
MANIFOLD
FROM LIFT CONTROL MANIFOLD
Figure 45
Page 4 - - 44
ROTATION
DIRECTION
MOTOR
INLET
CROSSTRAX
MANIFOLD
TESTER
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.
MOTOR
OUTLET
CASE DRAIN
RELIEF VALVE (PRV1)
TEST SHOWN
Groundsmaster 4300--D