Gear Pump (P4) Flow Test
(Using Tester with Pressure Gauges and Flow Meter)
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
FROM MOW CONTROL
MANIFOLD
LIFT
CONTROL
MANIFOLD
Figure 53
The gear pump (P4) flow test should be performed to
make sure that the cutting deck lift circuit has adequate
hydraulic flow.
3. Read Precautions For Hydraulic Testing in this sec-
tion.
Procedure for Gear Pump (P4) Flow Test
CAUTION
1.
perature by operating the machine under load for
approximately ten (10) minutes.
Make sure hydraulic oil is at normal operating tem-
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.
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
Hydraulic System
Page 4 -- 52
Groundsmaster 4300--D
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