ProcedureforTractionCircuitChargePressureTest
Make sure hydraulic oil is at normal operating tem-
1.
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
1
2.
Parkmachineonalevelsurfacewiththecuttingdeck
lowered and off. Make sure engine is off and the parking
brake is engaged. Raise and support operator seat.
CAUTION
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.
2
3.
pressure test port (Fig. 21) under operator seat.
Connect a 1000 PSI (70 bar) gauge onto charge
Figure 21
1.
Charge pressure port
2.
Filter manifold
4.
After installing pressure gauge, start engine and run
at idle speed. Check for hydraulic leakage and correct
before proceeding with test.
5.
Operate the engine at full engine speed (2870 RPM)
with no load on the hydraulic system.
GAUGE READING TO BE 200 to 300 PSI (13.8 to
20.6
bar).
6.
7.
restrictioninpumpintakeline.Also,inspectchargerelief
valve located in filter manifold (see Hydraulic Manifold
Service: Filter Manifold in the Service and Repairs sec-
tionofthischapter).Ifnecessary,checkforinternaldam-
age or worn parts in gear pump.
Stop engine and record test results.
If there is no pressure, or pressure is low, check for
8.
Also, with the pressure gauge still connected to the
charge pressure test port, take a gauge reading while
operating the machine in forward and reverse. Start the
engine and put throttle atfull engine speed (2870 RPM).
Apply the brakes and push the traction pedal forward,
then reverse.
GAUGE READING TO BE 200 to 300 PSI (13.8 to
20.6
bar).
9.
If charge pressure is good under no load, but consis-
tently drops below specification when under traction
load, the piston (traction) pump and/or traction motor(s)
should be suspected of wear and inefficiency. When the
pumpand/ortractionmotor(s)arewornordamaged,the
charge pumpisnotable tokeep upwith internal leakage
in traction circuit components.
10.When
testing is completed, disconnect pressure
gauge from test port.
Groundsmaster 4100--D
Page 4 -- 33
Hydraulic System
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