Groundsmaster 4100--D Hydraulic SystemPage 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.
CAUTION
Move machine to an open area, away from people
and obstructions.
2. Drive machine to an open area, lower cutting decks,
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 (Forward or Reverse:
Fig. 19 or 20).
4. After installing pressure gauge, start engine and run
at idle speed. Check for hydraulic leakage and correct
before proceeding with test.
5. Operate the engine at full speed (2730 +
30 RPM).
6. 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: maximum of 4000 PSI
Reverse: maximum of 5000 PSI
7. Release traction pedal and stop engine. Record test
results.
8. If traction pressure is too low, inspect traction pump
relief valves (Fig. 21). 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.
9. Disconnect pressure gauge from test port.
1. Forward traction port 2. LH front tire
Figure 19
2
1
1. Reverse traction port 2. RH front tire
Figure 20
1
2
1. Forward relief valve
2. Reverse relief valve
3. Traction pump
Figure 21
1
2
3
FRONT
RIGHT
Hydraulic
System
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