Greensmaster 3250--D Hydraulic SystemPage 4 -- 4 3
Procedure for Gear Pump (Front Section) 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
Before continuing further, read and become fa-
miliar with Precautions for Hydraulic Testing.
3. Disconnect the hose from the fitting in the front gear
pumps ection(Fig.24).ThishoseleadstoportP1onthe
hydraulic manifold.
4. Install tester with pressure gauge and flow meter in
series with front gear pump section fitting and the dis-
connectedhose.Make sure the flow control valve on
the tester is fully open.
5. Makesurethatreelspeedissettohighestspeedset-
ting (fully open) and that backlap knob on the hydraulic
manifold is in the mow position.
CAUTION
Donotengagethecuttingunitswhenperforming
this test.
6. Start engine and operate at high idle speed (2710 +
50 RPM).
IMPORTANT: Do not fully restrict oil f low through
tester. In this test, the flow tester is positioned be-
fore the circuit relief valve. Gear pump damage can
occur if the oil flow is fully restricted.
7. Watchpressuregauge carefully while slowly closing
the flow control valve on the tester until 2000 PSI (138
bar) is obtained.
8. Flow gauge readingfor a gear pumpsectioningood
condition should be approximately 6.4 GPM (24.2
LPM). Record test results.
9. Oncegearpumpflowisrecorded,opencontrolvalve
on tester and shut off engine.
10.If flow was less than 5.5 GPM (20.8 LPM) or a pres-
sure of 2000 PSI (138 bar) cannot be obtained, check
for restriction in the gear pump intake line. If line is not
restricted, remove gear pump and repair or replace as
necessary.
11.When testing is complete, disconnect tester from
gear pump fitting and hydraulic hose. Connect hose t o
pump fitt ing.
12.Adjust reel speed knob on mow control manifold to
original setting.
1. Gear pump 2. Front section hose
Figure 24
2
1
Hydraulic
System
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