Greensmaster 3300/3400 Hydraulic SystemPage 5 -- 49
The mow circuit gear pump flow test should be per-
formed to make sure that the mowcircuit has adequate
hydraulic flow.
Procedure for Mow 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 front gear pump section (Fig. 27). Dis-
connect hose from pump fitting.
4. Install hydraulic tester (pressure and flow) in series
with the front 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. Make sure backlap lever on the mow control man-
ifoldisinthemow position and reel speed knob (FC) is
set to highest speed setting (fully open).
CAUTION
Donotengagethecuttingunitswhenperforming
this test.
6. After hydraulic tester has been connected, start en-
gineandrunatlowidlespeed.Checkforhydraulicleak-
age and correct before proceeding with test.
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. Watchpressuregaugecarefullywhileslowlyclosing
the flow control valve on the tester until 2000 PSI (138
bar) is obtained.
9. Flow gauge reading for a gear pump in good condi-
tion should be approximately 6.9GPM(26LPM).Re-
cord test results.
10.Open control valve on tester and shut off engine.
11.Ifflow was less than 6.1 GPM (23.1 LPM) or a pres-
sure of 2000 PSI (138 bar) cannot be obtained, check
for restriction in the pump intake line. If line is not re-
stricted, remove gear pump and repair or replace as
necessary.
12.When testing is c omplete, disconnect tester from
gear pump fitting and hydraulic hose. Connect hose to
pump fitting.
13.Adjust reel speed knob (FC) on mow control man-
ifold to original setting.
GR3300 GEAR PUMP SHOWN
2
1
1. Gear pump 2. Front section fitting
Figure 27
Hydraulic
System
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