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Groundsmaster 4100--D/4110--DHydraulic System Page 4 -- 66
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
30.5GPM
GG
G
G
TO COMBINATION
MANIFOLD
FROM
COMBINATION
MANIFOLD
FROM MANIFOLD
AND FAN MOTOR
FROM REAR
TRACTION
MANIFOLD
FROM CENTER
DECK MANIFOLD
FROM REARAXLE MOTOR
TO COMBINATION
MANIFOLD
FROM
OILFILTER
FROM
MOW CIRCUIT
TESTER
TO CENTER DECK
PTO MANIFOLD
TO LEFT DECK
PTO MANIFOLD
TOTRACTION
MOTORS
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 cutting wing 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 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.