HYDRAULICS
8M-76
Traction Motor Test – Left Side
Left Front Motor
12.Perform traction pump test first and leave flow
meter hoses connected as outlined in Traction
Pump Test. Do not disturb the hydro lock linkage,
as it must remain set at 10 gpm (37.8 lpm).
13.Install wheel restraint on left front wheel.
14.Lift rear of tractor and install stand under axle on
left rear wheel so that left rear wheel is off the
ground and can rotate without interference.
15.Install blocking discs in tee fittings on traction
pump to block oil flow to the right side wheel
motors (Figure 8M-20).
16.Install blocking disc on the PLT port on the hot oil
shuttle valve (Figure 8M-20).
17.Remove blocking disc from flow meter tee fittings
previously installed for traction pump test
(Figure 8M-19).
18.Open the tester load valve, set the parking brake,
start the engine, and advance the engine speed to
full throttle.
19.Make sure flow meter no load flow (10 gpm/
37.8 lpm) matches the no load flow measured in
the traction pump test.
20.Slowly close tester load valve until a reading of
2000 psi (138 Bar) is obtained. Read and record
flow D) on Flow Test Report 3.
Conclusion
• If leakage (Minus Traction Pump Leakage) is less
than 1 gpm (3.8 lpm), wheel motor is not at fault.
• If leakage is 1 to 2 gpm (3.8 to 7.5 lpm), wheel motor
is marginal.
• If leakage is 2 gpm (7.5 lpm) or more, wheel motor is
faulty.
Left Rear Motor
21.Perform traction pump test first and leave flow
meter hoses connected as outlined in Traction
Pump Test. Do not disturb the hydro lock linkage,
as it must remain set at 10 gpm (37.8 lpm).
22.Install wheel restraint on left rear wheel.
23.LIft left front of tractor and install stand under axle
on left front wheel so that left front wheel is off the
ground and can rotate without interference.
24.Install blocking discs in tee fittings on traction
pump to block oil flow to the right side wheel
motors (Figure 8M-20).
25.Install blocking disc on the PLT port on the hot oil
shuttle valve (Figure 8M-20).
26.Remove blocking disc from flow meter tee fittings
previously installed for the traction pump test
(Figure 8M-19).
27.Open the tester load valve, set the parking brake,
start the engine, and advance the engine speed to
full throttle.
28.Make sure flow meter no load flow (10 gpm/
37.8 lpm) matches the no load flow measured in
the traction pump test.
29.Slowly close tester load valve until a reading of
2000 psi (138 Bar) is obtained. Read and record
flow E) on Flow Test Report 3.
Conclusion
• If leakage (Minus Traction Pump Leakage) is less
than 1 gpm (3.8 lpm), wheel motor is not at fault.
• If leakage is 1 to 2 gpm (3.8 to 7.5 lpm), wheel motor
is marginal.
• If leakage is 2 gpm (7.5 lpm) or more, wheel motor is
faulty.
NOTICE
If rear wheel motor has excessive leakage, inspect
the four-wheel-drive check valve for damage or leak-
ing seals prior to repairing the rear wheel motor. A
leaking check valve will affect this test.
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