Lift Relief Valve (Prv) Pressure Test - Toro GroundsmasterR 4300-D Service Manual

Lift Relief Valve (PRV) Pressure Test

TO DECK CONTROL MANIFOLD
(FRONT CUTTING UNITS)
TO DECK CONTROL MANIFOLD
(REAR CUTTING UNITS)
PUMP (P5)
INTERNAL
CASE
DRAIN
FROM MOW CONTROL
MANIFOLD
The lift relief valve (PRV) pressure test should be per-
formed to make sure that the lift circuit relief pressure is
correct.
Procedure for Lift Relief Valve (PRV) Pressure 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. Apply the parking brake.
3. Read Precautions For Hydraulic Testing in this sec-
tion.
Hydraulic System
TO STEERING
CONTROL VALVE
GEAR
PUMP
PRESSURE
GAUGE
Figure 51
Before opening hydraulic system, operate all hy-
draulic controls to relieve system pressure and
avoid injury from pressurized hydraulic oil. See
Relieving Hydraulic System Pressure in the Gen-
eral Information section of this chapter.
4. Gain access to hydraulic lift control manifold by re-
moving the operator floor plate. The lift control manifold
is attached to a frame bracket under the floor plate (Fig.
52).
Page 4 - - 50
LIFT
CONTROL
MANIFOLD
CAUTION
Groundsmaster 4300--D