Procedure for Traction Circuit Relief Pressure Test
Make sure hydraulic oil is at normal operating tem-
1.
2
perature by operating the machine under load for
approximately ten (10) minutes. Make sure the hydrau-
lic tank is full.
CAUTION
1
Movemachinetoanopenarea,awayfrompeople
and obstructions.
Figure 27
2.
turn the engine off and apply the parking brake.
Drive machine to an open area, lower cutting decks,
1.
Forward traction port
2.
Left front wheel
CAUTION
2
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.
1
3.
traction circuit test port for function to be checked (Fig.
Connect a 10,000 PSI (700 bar) pressure gauge to
27
4.
or 28).
Figure 28
Start the engine and move throttle to high idle speed
RPM). Release parking brake. Make sure that Hi/
1.
Reverse traction port
2.
Right front wheel
(2870
Low speed switch is in the Hi speed (2WD) position.
5.
Siton seat,apply brakes fully andslowly depress the
RIGHT
2
FRONT
traction pedal in the appropriate direction (forward or re-
verse). While pushing traction pedal, look at pressure
reading on gauge:
GAUGE READING TO BE:
Forward: 3750 to 4250 PSI (259 bar to 293 bar)
Reverse: 4750 to 5250 PSI (328 to 362 bar)
6.
results.
Release traction pedal and stop engine. Record test
3
7.
If traction pressure is too low, inspect traction pump
1
relief valves (Fig. 29). Clean or replace relief valves as
necessary. These cartridge type valves are factory set,
and are not adjustable. If relief valves are in good condi-
tion, traction pump or wheel motors should be sus-
pected of wear and inefficiency.
Figure 29
3.
1.
2.
Forward relief valve
Reverse relief valve
Traction pump
NOTE: Seal leakage across pilot directional valves
PD1 and PD2 in 4WD manifold can cause low forward
traction pressure withreverse pressure meeting specifi-
cations.
8.
When testing is completed, disconnect pressure
gauge from test port.
Groundsmaster 4000--D/4010--D
Page 4 -- 41
Hydraulic System
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