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Greensmaster 3150 Hydraulic SystemPage 4 -- 41
Procedure for Gear Pump (Front Section) Flow
Test
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately ten
(10) minutes.
2. Park machine on a levelsurface withthe cutting units
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
pump section (Fig. 26). This hose leadsto portP1 on the
hydraulic manifold.
4. Install tester with p ressure gauge and flow meter in
series with front gear pump section fitting and the dis-
connected hose. Make sure the flow control valve on
the tester is f ully open.
5. Makesure thatreel speed is set tohighest speed set-
ting (fully open) and that backlap knob on the hydraulic
manifold is in the mow position.
CAUTION
Do not eng age thecutting unitswhen performing
this test.
6. Start engine and operate at high idle speed (2850 +
50 RPM).
IMPORTANT: Do not fully restrict oil flow 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. Watch pressure gauge carefully while slowly closing
the flow control valve on the tester until 2000 PSI (138
bar) is obtained.
8. Flow gauge reading for a gear pump section in good
condition should be approximately 6.7 GPM (25.3
LPM). Record test results.
9. Once gear pump flow is recorded,open control valve
on tester and shut off engine.
10.If flow was less than 5.7 G PM (21.6 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 fr o m
gear pump fitting and hydraulic hose. Connect hose to
pump fitt ing.
12.Adjust reel speed knob on mow control manifold t o
original setting.
1. Gear pump 2. Front section fitting
Figure 26
1
2
Hydraulic
System