ProcedureforTractionCircuitChargePressureTest
Make sure hydraulic oil is at normal operating tem-
2
1.
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
2.
decks lowered and off. Make sure engine is off and the
parking brake is engaged.
Park machine on a level surface with the cutting
1
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.
Figure 18
1.
Charge pressure port
2.
Hydraulic reservoir cap
3.
test port (Fig. 18) under operator seat.
Connect a 1000 PSI gauge onto charge pressure
4.
at idle speed. Check for hydraulic leakage and correct
before proceeding with test.
After installing pressure gauge, start engine and run
5.
RPM) with no load on the hydraulic system.
Operate the engine at full engine speed (2730 + 30
GAUGE READING TO BE 200 to 300 PSI.
6.
7.
restrictioninpumpintakeline.Also,inspectchargerelief
valve located in filter manifold (see Hydraulic Manifold
Service: Filter Manifold in this chapter). If necessary,
check for internal damage 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 at full engine speed (2730 + 30
RPM). Apply the brakes and push the traction pedal for-
ward, then reverse.
GAUGE READING TO BE 200 to 300 PSI.
9.
If charge pressure is good under no load, but drops
below specification when under traction load, the piston
(traction) pump and/or traction motor(s) should be sus-
pected of wear and inefficiency. When the pump and/or
traction motor(s) are worn or damaged, the charge
pump is not able to keep up with internal leakage in trac-
tion circuit components.
10.Disconnect
pressure gauge from test port.
Groundsmaster 4100--D
Page 4 -- 25
Hydraulic System
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