Groundsmaster 4300--DHydraulic System Page 4 -- 46
Gear Pump (P1) and (P2) Flow Test
(Using Tester with Pressure and Flow Capabilities)
Figure 47
GEAR
PUMP
CROSSTRAX
MANIFOLD
BYPASS
PISTON
(TRACTION)
PUMP
DECK
CONTROL
MANIFOLD
VALVE
FROM STEERING CONTROLVALVE
FROM LIFT CONTROL MANIFOLD
TO LIFT CONTROL MANIFOLD
TO STEERING CONTROL VALVE AND CHARGE CIRCUIT
TESTER
GEAR PUMP (P1)
FLOW TEST SHOWN
Over a period of time, the gears and wear plates in the
gear pump can wear. A worn pump will by-pass oil and
make the pumpless efficient. Eventually,enough oil can
by-pass to cause the decks to stall in heavy cutting con-
ditions. Continued operation with a worn, inefficient
pump can generate excessive heat and cause damage
to seals and other components in the hydraulic system.
Procedure for Gear Pump (P1) and (P2) 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.
