Toro Groundsmaster 4000-D Service Manual page 114

Gear Pump Flow (Using Tester with Pressure Gauge and Flow Meter)
SECOND GEAR PUMP SECTION FLOW TEST SHOWN
The gear pump flow test should be performed to make
sure that the mow, steering, lift/lower, cooling fan and
traction charge circuits have adequate hydraulic flow.
The front gear pump section provides hydraulic flow for
the side cutting decks (Fig. 47). The second gear pump
section provides hydraulic flow for the center cutting
deck. The third gear pump section provides hydraulic
flow for the cooling fan, lift/lower and traction charge cir-
cuits. The fourth gear pump section provides hydraulic
flow for the steering, traction charge and cooling fan cir-
cuits.
Hydraulic System
TESTER
Page 4 - - 68
FROM MANIFOLD
AND FAN MOTOR
NOTE: 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 pump less efficient. Eventually, enough oil
loss will occur to cause circuit problems (e.g. cutting
deck motors stalling under heavy cutting conditions, lift
or steering problems). Continued operation with a worn,
inefficient gear pump can generate excessive heat and
cause damage to the seals and other components in the
hydraulic system.
Groundsmaster 4000--D/4010--D