HYDRAULICS
8M-78
Traction Motor Test – Right Side
Right Front Motor
30.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).
31.Install wheel restraint on right front wheel.
32.Lift rear of tractor and install stand under axle on
right rear wheel so that right rear wheel is off the
ground and can rotate without interference.
33.Install blocking discs in tee fittings on traction
pump to block oil flow to the left side wheel motors
(Figure 8M-21).
34.Install blocking disc on the PLT port on the hot oil
shuttle valve (Figure 8M-21).
35.Remove blocking disc from flow meter tee fittings
previously installed for the traction pump test
(Figure 8M-19)
36.Open the tester load valve, set the parking brake,
start the engine, and advance the engine speed to
full throttle.
37.Make sure flow meter no load flow (10 gpm/
37.8 lpm) matches the no load flow measured in
the traction pump test.
38.Slowly close tester load valve until a reading of
2000 psi (138 Bar) is obtained. Read and record
flow F) 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.
Right Rear Motor
39.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).
40.Install wheel restraint on right rear wheel.
41.Lift right front of tractor and install stand under
axle on right front wheel so that right front wheel is
off the ground and can rotate without interference.
42.Install blocking discs in tee fittings on traction
pump to block oil flow to the left side wheel motors
(Figure 8M-21).
43.Install blocking disc on the PLT ports on the hot oil
shuttle valve (Figure 8M-21).
44.Remove blocking disc from flow meter tee fittings
previously installed for the traction pump test
(Figure 8M-19) or left side motor test (Figure 8M-
20).
45.Open the tester load valve, set the parking brake,
start the engine, and advance the engine speed to
full throttle.
46.Make sure flow meter no load flow (10 gpm/
37.8 lpm) matches the no load flow measured in
the traction pump test.
47.Slowly close tester load valve until a reading of
2000 psi (138 Bar) is obtained. Read and record
flow G) 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.
48.Disconnect the flow meter and remove all blocking
discs from the traction circuit and restore all hose
connections.
49.Remove hydro lock linkage, install traction pedal
cable, and properly adjust cable (Section 2C of
this manual).
Hot Oil Shuttle
The hot oil shuttle, if leaking internally, will affect the
performance of the traction circuit in reverse direction.
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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