Toro Groundsmaster 4010-D - Page 114

Groundsmaster 4000--D/4010--DHydraulic System Page 4 -- 68
Gear Pump Flow (Using Tester with Pressure Gauge and Flow Meter)
SECOND GEAR PUMP SECTION FLOW TEST SHOWN
3.3 GPM
14.3 GPM
14.3 GPM
250 PSI
4350 PSI
5000 PSI
.0315
.0315
0.4
CID
0.3 1.29 1.29
CID CID CID
2.75
CID
ENGINE
30.5
GPM
GG
G
G
TO COMBINATION
MANIFOLD
FROM
COMBINATION MANIFOLD
TO FRONT TRACTION MANIFOLD
FROM MANIFOLD
AND FAN MOTOR
FROM REAR
TRACTION MANIFOLD
FROM CENTER
DECK MANIFOLD
FROM REAR AXLE MOTOR
TO COMBINATION
MANIFOLD
FROM OIL FILTER
FROM MOW CIRCUIT
TESTER
TO CENTER DECK PTO MANIFOLD TO LEFT DECK PTO MANIFOLD
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.
NOTE: Overaperiodoftime,thegearsandwearplates
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 p roblems (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.