Toro Greensmaster TriFlex 3400 - Page 97

Greensmaster 3300/3400 Hydraulic SystemPage 5 -- 45
The steering/lift circuit gear pump flow test should be
performed to make sure that the steering, lift and trac-
tion charge circuits have adequate hydraulic flow.
Procedure for Steering/Lift Circuit Gear Pump Flow
Test:
1. Make sure hydraulic oil is at normal operating tem-
peraturebyoperatingthemachineforapproximatelyten
(10) minutes.
2. Parkmachineonalevelsurfacewiththecuttingunits
lowered. Make sure engine is off and the parking brake
is engaged. Make sure the hydraulic tank is full.
CAUTION
Prevent personal injuryand/or damageto equip-
ment. Read all WARNINGS, CAUTIONS and Pre-
cautions for Hydraulic Testing a t the beginning
of this section.
3. Thoroughlycleanjunctionofhydraulichoseand dis-
charge fitting of rear gear pump section (Fig. 25). Dis-
connect hose from pump fitting.
4. Install hydraulic tester (pressure and flow) in series
with the rear gear pump section and the disconnected
hose. Make sure that tester flow arrow points from the
pump discharge and toward the disconnected hose.
Also, make sure flow control valve on the tester is
fully open.
5. Makesurethattractionpedalandjoystickareinneu-
tral and the parking brake is engaged.
6. Startengineand runatlow idlespeed.Check forhy-
draulicleakageandcorrectbeforeproceedingwithtest.
7. Movethrottlesoengineisrunningathighidlespeed.
IMPORTANT: Do not fully restrict oil flow through
tester. In this test, the flow tester is positioned be-
forethe circuitreliefvalve.Pumpdamagecanoccur
if the oil flow is fully restricted.
8. Watchflowandpressuregaugecarefullywhileslow-
ly closing the flow control valve on the tester until the
pressure gauge reads 800 PSI (55.2 bar).
9. Flow gauge reading for a gear pump in good condi-
tion should be approximately 3.9 GPM (14.8 LPM).
10.Opencontrolvalveontesterandshutoffengine.Re-
cord test results.
11.If gear pump flow is less than 3.5 GPM (13.2 LPM),
checkforrestrictioninthepump intakeline.Ifnorestric-
tion is found, repair or replace rear gear pump section.
12.Whentestingiscomplete,disconnecttesterfromthe
gear pump fitting and hydraulic hose. Connect hose to
pump fitting.
1. Gear pump 2. Rear section fitting
Figure 25
GR3300 GEAR PUMP SHOWN
2
1
Hydraulic
System