Groundsmaster 4000--D/4010--D Hydraulic SystemPage 4 -- 41
Procedure for Traction Circuit Relief Pressure Test
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.
Movemachinetoanopenarea,awayfrompeople
and obstructions.
CAUTION
2. Drivemachine to anopen area,lower cutting decks,
turn the engine off and apply the parking brake.
CAUTION
Prevent personalinjury and/or damage to equip -
ment. Read all WARNINGS, CAUTIONS and Pre-
cautions for Hydraulic Testing at the beginning
of this section.
3. Connect a 10,000 PSI (700 bar) pressure gauge to
traction circuit test port for function to be checked (Fig.
27 or 28).
4. Starttheengineandmove throttle to highidlespeed
(2870RPM).Releaseparkingbrake.MakesurethatHi/
Low speed switch is in the Hi speed (2WD) position.
5. Sitonseat,applybrakesfullyandslowlydepressthe
tractionpedalintheappropriatedirection(forwardorr e-
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. Releasetractionpedalandstop engine. Recordtest
results.
7. If traction pressure is too low, inspect traction pump
relief valves (Fig. 29). C lean or replace relief valves as
necessary. These cartridge type valves are factory set,
andarenotadjustable.Ifreliefvalvesarein goodcondi-
tion, traction pump or wheel motors should be sus-
pected of wear and inefficiency.
NOTE: Seal leakage across pilot directional valves
PD1 and PD2 in 4WD manifold can cause low forward
tractionpressurewithreversepressuremeetingspecifi-
cations.
8. When testing is completed, disconnect pressure
gauge from test port.
1. Forward traction port 2. Left front wheel
Figure 27
1
2
1. Reverse traction port 2. Right front wheel
Figure 28
1
2
1. Forward relief valve
2. Reverse relief valve
3. Traction pump
Figure 29
1
2
3
FRONT
RIGHT
Hydraulic
System
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