Groundsmaster 4300--DHydraulic System Page 4 -- 52
Gear Pump (P4) Flow Test
(Using Tester with Pressure Gauges and Flow Meter)
Figure 53
GEAR
PUMP
LIFT
CONTROL
MANIFOLD
TO STEERING
CONTROL VALVE
INTERNAL
CASE
DRAIN
PUMP(P5)
TO DECK CONTROL MANIFOLD
(REAR CUTTING UNITS)
(FRONT CUTTING UNITS)
TO DECK CONTROL MANIFOLD
FROM MOW CONTROL
MANIFOLD
TESTER
The gear pump (P4) flow test should be performed to
make sure that the cutting deck lift circuit has adequate
hydraulic flow.
Procedure for Gear Pump (P4) Flow
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.
CAUTION
Before opening hydraulic system, operateall 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.
