Toro Groundsmaster 5900 Series Service Manual page 143

Procedure for Traction Circuit Relief Pressure Test
Groundsmaster ® 5900 & 5910
16227SL Rev B
1. Make sure hydraulic oil is at normal operating temperature (54 to 66 ºC (130
to 150 ºF)) by operating the machine for approximately ten (10) minutes.
Make sure the hydraulic tank is full.
Perform Traction Circuit Relief Pressure Test in an open area, away
from people and obstructions.
2. Drive machine to an open area, fully raise cutting decks, engage parking
brake and turn the engine off.
g287737
1. Forward test port (MA)
2. Reverse test port (MB)
3. Connect a 700 Bar (10,000 PSI) pressure gauge with hydraulic hose attached
to traction circuit test port for function to be checked
gauge hose to allow operator to view the gauge.
4. After installing pressure gauge, start engine and run at low idle speed. Check
for hydraulic leakage at tester connections and correct before proceeding
with test.
5. Sit on seat and operate the engine at high idle speed (2530 RPM). Make sure
that machine is in the high range traction speed (transport).
6. Drive machine so front tires are wedged against an immovable object (e.g. a
curb) to prevent wheel rotation in the direction to be tested. An alternative
would be to position the machine on an inclined surface to allow a high
traction load in the direction to be tested.
7. Slowly depress the traction pedal in the appropriate direction (forward or
reverse). While pushing traction pedal, look at pressure reading on gauge.
As the traction relief valve lifts, the gauge needle will stop momentarily.
GAUGE READING TO BE:
402 to 411 bar (5825 to 5965 PSI) in forward (MA port)
397 to 407 bar (5760 to 5910 PSI) in reverse (MB port)
8. Release traction pedal and stop engine. Record test results.
CAUTION
1
2
Figure 52
3. Forward relief valve
4. Reverse relief valve
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3 4
(Figure 52). Route
Hydraulic System: Testing