Procedure for Piston (Traction) Pump Flow Test
7. Start engine and run at idle speed. Check for any hy-
draulic leakage from tester and hose connections. Cor-
rect any leaks before proceeding.
This test measures piston (traction) pump output (flow).
During this test, pump load is created at the flow meter
using the adjustable load valve on the tester.
8. Move throttle so engine is running at high idle speed
(2870
RPM).
IMPORTANT: Traction the
Groundsmaster 4100/4110isapproximately 30GPM
LPM).Use40GPMHydraulicTester#AT40002
circuit
flow
for
9. Slowly push traction pedal to fully forward position.
Keep pedal fully depressed in the forward position.
(113.5
(pressure and flow) for this test (see Special Tools
in this chapter).
10.Have
secondpersoncarefullywatchpressuregauge
on tester while slowly closing the flow control valve until
1000PSI(69bar)isobtained.Verifywithaphototacthat
the engine speed is still 2870 RPM.
1.
Make sure hydraulic oil is at normal operating tem-
perature by operating the machine under load for
approximately ten (10) minutes. Make sure the hydrau-
lic tank is full.
NOTE: If engine speed drops below 2870 RPM, pump
flow will decrease.
2.
Parkmachineonalevelsurfacewiththecuttingdeck
11.
approximately 29 GPM (110 LPM).
Observe flow gauge. Flow indication should be
raisedandoff.Latchwingdecksinraisedposition.Make
sure that the Hi/Low switch is in the Low speed (4WD)
position. Shut off engine.
12.Release
traction pedal to the neutral position, open
flow control valve on tester and shut off engine. Record
test results.
CAUTION
13.If
flow is less than 26 GPM (98 LPM), consider the
following:
Prevent personal injury and/or damage to equip-
ment. Read all WARNINGS, CAUTIONS and Pre-
cautions for Hydraulic Testing at the beginning
of this section.
A. The traction pump swash plate is not being ro-
tated fully (e.g. Hi/Low switch is not in Low speed
(4WD),
ment).
traction pedal linkage may need adjust-
3.
Make sure that traction pedal is adjusted to the neu-
tral position. Also, ensure that traction pump is at full
stroke when traction pedal is pushed into fully forward
position.
B. The hydrostat needs to be repaired or replaced
as necessary.
14.Make
necessary repairs beforeperforming anyaddi-
4.
Raise and support machine so all wheels are off the
ground (see Jacking Instructions in Chapter 1 -- Safety).
tional tests.
15.When
testing is complete, disconnect tester and
5.
side fitting on bottom of traction pump (forward port)
(Fig. 36). Disconnect hose from left side pump fitting.
Thoroughly clean junction of hydraulic hose and left
hose kit from pump fitting and machine hydraulic hose.
Reconnectmachinehydraulichosetopumpfitting.Low-
er machine to ground.
6.
Install 40 GPM Hydraulic Tester #AT40002 (pres-
sure and flow) in series between traction pump fitting
and disconnected hose to allow flow from traction pump
totester.Usehydraulichosekit(seeSpecialToolsinthis
chapter)toconnecttestertomachine.Makesurethatfit-
ting and hose connections are properly tightened. Also,
make sure the flow control valve on tester is fully open.
RIGHT
1
FRONT
CAUTION
Allwheelswillbeoffthegroundandrotatingdur-
ing this test. Make sure machine is supported so
itwillnotmoveandaccidentallyfalltopreventin-
juring anyone near the machine.
2
Figure 36
1.
Piston (traction) pump
2.
LH fitting (forward port)
Groundsmaster 4100--D/4110--D
Page 4 -- 49
Hydraulic System
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