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Groundsmaster 4000--D Hydraulic System (Rev. B)Page 4 -- 27
Procedure for Traction Circuit Relief Pressure Test
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
Move machine to an open a rea, away from people
and obstructions.
CAUTION
2. Drive machine to an open area, lower cutting units,
turn the engine off and engage the parking brake.
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.
3. Connect a 10,000 psi gauge to traction circuit test
port for function to be checked (Fig. 16).
4. Start the engine and movethrottle to full speed (2730
+
30 RPM). Release parking brake.
5. Siton seat, apply brakes fully, andslowly depress the
traction pedal in the appropriate direction. While pu-
shing traction pedal, look at pressure reading on gauge:
GAUGE READING TO BE:
Forward: 4000 PSI
Reverse: 5000 PSI
6. If traction pressure is too low, inspect traction pump
relief valves (Fig. 17). Clean orreplace valves as neces-
sary. These cartridge type valves are factory set, and
are not adjustable. If relief valves are in good condition,
traction pump or w heel motors should be suspected of
wear and inefficiency.
1. Forward traction port 2. Left front wheel
Figure 15
1
2
1. Reverse traction port 2. Right front wheel
Figure 16
1
2
1. Forward relief valve
2. Reverse relief valve
3. Traction pump
Figure 17
1
2
3
Hydraulic
System