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 area, 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 move throttle to full speed (2730
+
30 RPM). Release parking brake.
5. Sit on seat, apply brakes fully, and slowly 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 or replace 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 wheel 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
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