Gear Pump (P1) and (P2) Flow Test
(Using Tester with Pressure and Flow Capabilities)
TO STEERING CONTROL VALVE AND CHARGE CIRCUIT
TO LIFT CONTROL MANIFOLD
TESTER
GEAR
PUMP
GEAR PUMP (P1)
FLOW TEST SHOWN
BYPASS
VALVE
CROSSTRAX
MANIFOLD
PISTON
(TRACTION)
PUMP
FROM STEERING CONTROL VALVE
DECK
CONTROL
MANIFOLD
FROM LIFT CONTROL MANIFOLD
Figure 47
Over a period of time, the gears and wear plates in the
gear pump can wear. A worn pump will by-pass oil and
makethepumplessefficient.Eventually,enough oilcan
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.
perature by operating the machine under load for
approximately ten (10) minutes.
Make sure hydraulic oil is at normal operating tem-
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 -- 46
Groundsmaster 4300--D
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