Toro Groundsmaster
4000?D Service Manual page 62

PRELIMINARY – For Toro Distributor and Toro Company use only.
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.
2. Drive machine to an open area, lower cutting units,
turn the engine off and engage the parking brake.
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 (2870
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: 3750 to 4250 PSI
Reverse: 4750 to 5250 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.
Hydraulic System
CAUTION
CAUTION
1. Forward traction port
1. Reverse traction port
2
1. Forward relief valve
2. Reverse relief valve
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2
1
Figure 15
2. Left front wheel
2
1
Figure 16
2. Right front wheel
3
1
Figure 17
3. Traction pump
Groundsmaster 4000−D