Lift Relief Valve (PRV) Pressure Test
TO STEERING
CONTROL VALVE
TO DECK CONTROL MANIFOLD
(FRONT CUTTING UNITS)
TO DECK CONTROL MANIFOLD
(REAR CUTTING UNITS)
GEAR
PUMP
PUMP (P5)
INTERNAL
CASE
DRAIN
PRESSURE
GAUGE
FROM MOW CONTROL
MANIFOLD
LIFT
CONTROL
MANIFOLD
Figure 51
The lift relief valve (PRV) pressure test should be per-
formed to make sure that the lift circuit relief pressure is
correct.
CAUTION
Procedure for Lift Relief Valve (PRV) Pressure Test
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.
1.
Make sure hydraulic oil is at normal operating tem-
perature by operating the machine under load for
approximately ten (10) minutes.
2.
decks lowered and PTO switch off. Make sure engine is
off. Apply the parking brake.
Park machine on a level surface with the cutting
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).
3.
Read Precautions For Hydraulic Testing in this sec-
tion.
Hydraulic System
Page 4 -- 50
Groundsmaster 4300--D
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