Toro Groundsmaster 4000-D Service Manual page 91

Procedure for Traction Circuit Relief Pressure Test
NOTE: The traction charge circuit is designed to re-
place loss of hydraulic fluid from the closed loop traction
circuit.
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.
1. Park machine on a level surface with the cutting
decks lowered and off. Make sure hydraulic oil is at nor-
mal operating temperature, engine is off and the parking
brake is applied.
CAUTION
When performing the traction circuit relief pres-
sure test, 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 apply the parking brake.
3. Connect a 10,000 PSI (700 bar) pressure gauge to
traction circuit test port for function to be checked (Fig.
28 or 29).
4. Start engine and increase engine speed to high idle
speed. Release parking brake. Make sure that HI/LOW
speed switch is in the HI (transport) position.
NOTE: If possible, turn off Smart Power
InfoCenter display protected menu. Machines with TEC
software above revision level G will allow Smart
TM
Power to be disabled for testing. Check software revi-
sion level using the InfoCenter About screen.
5. Sit on seat, apply brakes fully and slowly depress the
traction pedal in the appropriate direction (forward or re-
verse). While pushing traction pedal, look at pressure
reading on gauge:
GAUGE READING TO BE:
Forward: 4100 to 4600 PSI (283 to 317 bar)
Reverse: 4750 to 5250 PSI (328 to 362 bar)
Groundsmaster 4000--D/4010--D
6. Release traction pedal and stop engine. Record test
results.
7. If traction pressure is too low, inspect traction pump
relief valves (Fig. 28 or 29). Clean or replace relief
valves as necessary. 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.
8. When testing is completed, disconnect pressure
gauge from test port. Secure dust cap to test fitting.
2
1. Forward traction port
TM
by using the
1. Reverse traction port
Page 4 - - 45
1
Figure 28
2. Forward relief valve
RIGHT
FRONT
Figure 29
2. Reverse relief valve
FRONT
2
1
Hydraulic System