Procedure for Traction Circuit Relief Pressure Test
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.
CAUTION
1
Movemachinetoanopenarea,awayfrompeople
and obstructions.
Figure 19
1.
Forward traction port
2.
LH front tire
2.
turn the engine off, and engage the parking brake.
Drive machine to an open area, lower cutting decks,
2
CAUTION
1
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.
3.
port for function to be checked (Forward or Reverse:
Fig. 19 or 20).
Connect a 10,000 PSI gauge to traction circuit test
Figure 20
1.
Reverse traction port
2.
RH front tire
4.
at idle speed. Check for hydraulic leakage and correct
before proceeding with test.
After installing pressure gauge, start engine and run
RIGHT
5.
Operate the engine at full speed (2730 + 30 RPM).
FRONT
6.
traction pedal in the appropriate direction. While pu-
shing traction pedal, look at pressure reading on gauge:
Sitonseat,applybrakesfully,andslowlydepressthe
2
GAUGE READING TO BE:
Forward: maximum of 4000 PSI
Reverse: maximum of 5000 PSI
7.
results.
Release traction pedal and stop engine. Record test
3
1
8.
If traction pressure is too low, inspect traction pump
Figure 21
3.
reliefvalves (Fig.21).Clean orreplace valves asneces-
sary. These cartridge type valves are factory set, and
are not adjustable. If relief valves are in good condition,
traction pump or wheel motors should be suspected of
wear and inefficiency.
1.
2.
Forward relief valve
Reverse relief valve
Traction pump
9.
Disconnect pressure gauge from test port.
Groundsmaster 4100--D
Page 4 -- 27
Hydraulic System
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