Greensmaster 3300/3400 Hydraulic SystemPage 5 -- 37
This test measures piston pump output (flow). During
thistest,pumploadiscreatedattheflowmeterusingthe
adjustable load valve on the tester.
Procedure for Piston (Traction) Pump Flow
Test:
1. Make sure hydraulic oil is at normal operating tem-
peraturebyoperatingthemachineforapproximatelyten
(10) minutes.
2. Parkmachineonalevelsurfacewiththecuttingunits
lowered andoff.Make sure engineis off.Make surethe
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. Make sure the traction pedal is adjusted to the neu-
tral position. Also, make sure that transport speed is
properly adjusted.
4. Blockupfrontwheelsofftheground(alsorearwheel
if machine is equipped with 3WD) to allow flow through
the traction circuit.
5. Thoroughly cleanjunction ofhydraulichoseandup-
perhydraulicfittingonfrontsideofpistonpump(forward
port). Disconnect hose from upper pump fitting.
IMPORTANT: Traction circuit flow for Greensmas-
ter TriFlex machines is approximately 17 GPM (65
LPM).Use40GPMHydraulicTester#AT40002(pres-
sure andflow) forthis test (see SpecialTools in this
chapter).
6. Install 40 GPM Hydraulic Tester #AT40002 (pres-
sureand flow)in seriesbetweenpistonpumpfittingand
disconnected hose to allow flow from piston pump to
tester. Use hydraulic hose kit (see Special Tools in this
chapter)toconnecttestertomachine.Makesurethatfit-
tingandhose connectionsare properly tightened.Also,
make sure the flow control valve on tester is fully open.
7. After installingtester,startengineand runat lowidle
speed. Check for hydraulic leakage and correct before
proceeding with test.
8. Move functional lever to the transport position.
CAUTION
Wheelsofftheground will be rotating during this
test. Make sure machine is properly supported
soitwillnotmoveandaccidentallyfalltoprevent
injuring anyone near the machine.
9. Movethrottlesoengineisrunningathighidlespeed.
10.Slowly push traction pedal to fully forward position.
Keep pedal fully depressed in the forward position.
11.Havesecondpersoncarefullywatchpressuregauge
ontesterwhileslowlyclosing theflow controlvalve until
1000PSI(69bar)isobtained.Verifywithaphototacthat
the engine speed has not changed.
NOTE: Ifenginespeeddrops,pistonpumpfloww illde-
crease.
12.Observeflow gauge.Ifpistonpumpisingoodcondi-
tion, flow indicationshould be approximately 17.1 GPM
(64.7 LPM).
13.Release traction pedal, open control valve on tester
and turn off engine. Record test results.
14.If flow is less than 15.3 GPM (57.9 LPM), consider
the following:
A. The traction pedal and/or traction speed may
need adjustment.
B. The piston pump needs to be repaired or re-
placed as necessary.
C. Make necessary repairs before performing addi-
tional hydraulic traction circuit tests.
15.When piston pump flow testing is complete, discon-
necttesterfrompumpfittingandhose.Connecthydrau-
lic hose to pump fitting.
Hydraulic
System
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