Textron Jacobsen SLF530, Repair Manual

Page: 159 / 352

HYDROSTATIC POWER TRAIN
673831-Rev A 5-33
5
Rear Wheel Motor Test
2 8 . Remove test hose from fittings (17 and 1 8 )
29. Assemble hose (15) to fitting (17).
30. Assemble hose (16) to fitting (1 8 ).
31. Open flow meter valve completely before starting
engine.
32. Start engine, move parking brake switch to the OFF
position, and run at full throttle (3000 rpm ± 50).
33. Adjust flow lock tool (1) to allow pump to produce 15
gpm (57 lpm) in the forward direction.
34. Use the flow meter to warm the hydraulic oil. Turn the
flow meter valve until a reading of 2030 psi (140 bar)
or one half of the relief valve rating is reached. Warm
oil to 120–150° F (49–65° C); open valve fully after
operating temperature is reached.
35. After warming the hydraulic oil, verify flow lock tool is
adjusted to allow pump to produce 15 gpm (57 lpm)
in the forward direction.
36. Slowly close flow meter valve until pressure reaches
3045 psi (210 bar). Read and record loaded flow.
37. Open flow meter valve, stop engine, and move the
parking brake switch to the OFF position. Return flow
lock tool back to neutral position.
3 8 . Calculate rear wheel motor leakage.
(Step 25 – Step 36 / Step 25 of traction pump test x
100 = Leak Percentage)
Is rear wheel motor leakage 10% or less?
YES The rear wheel motor is good.
NO Proceed to next question.
Is rear wheel motor leakage 11% to 20%?
YES The rear wheel motor is marginal.
NO Proceed to next question.
Is rear wheel motor leakage 21% or more?
YES Repair or replace rear wheel motor. (See
“Front Wheel Motor” on page 5-47.)
39. Disconnect and remove test equipment. Install all
hoses and fittings as noted prior to removal.
40. Install and connect all components as noted prior to
test.
41. Check hydraulic oil level. Add oil as needed. (Refer to
“Safety, Operation, and Maintenance Manual” for oil
specifications.)