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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
3.3GPM
14.3GPM
14.3GPM
250PSI
4350PSI
5000PSI
.0315
.0315
0.4
CID
0.3 1.29 1.29
CID CID CID
2.75
CID
ENGINE
30.5
GPM
GG
G
G
TOCOMBINATION
MANIFOLD
FROM
COMBINATION
MANIFOLD
TO FRONT
TRACTION
MANIFOLD
FROMMANIFOLD
ANDFANMOTOR
FROMREAR
TRACTION
MANIFOLD
FROMCENTER
DECKMANIFOLD
FROMREARAX LE MOTOR
TOCOMBINATION
MANIFOLD
FROM
OILFILTER
FROM
MOWCIRCUIT
TESTER
TOCENTERDECK
PTOMANIFOLD
TOLEFTDECK
PTOMANIFOLD
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
andm ake thepump lessefficient. Eventually, enoughoil
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 theseals andother components inthe
hydraulic system.