5-16 4181383 First Edition
HYDROSTATIC POWER TRAIN
5
9. Retest charge pressure.
Is charge pressure 275–285 psi (19–20 bar)?
YES Charge pump is good.
NO Inspect, repair, or replace charge pump as
needed. (See “Traction Pump” on
page 5-27.)
10. Disconnect and remove test equipment. Install all
hoses and fittings as noted prior to removal.
11. Install and connect all components as noted prior to
test.
12. Check hydraulic oil level. Add oil as needed. (Refer to
“Safety, Operation, and Maintenance Manual” for
correct oil specifications.)
Traction System Test
See Figures 5-12 through 5-15.
IMPORTANT
• This test works together with the wheel motors
test to isolate a problem within the hydrostatic
power train.
• Performing this test will isolate the traction pump
and front wheel motors from the rest of the
hydrostatic system.
!
WARNING
1. Park the mower safely. (See “Park Mower Safely” on
page 1-5.)
2. Remove the center floorboard and seat.
3. Bypass seat switch.
Figure 5-12
4. Install wheel restraints to front wheels.
!
WARNING
IMPORTANT
It is important to lift and support the rear of machine
or the machine will move.
5. Lift and support the machine so that the rear wheels
are off the ground.
6. Disconnect traction pump control rod from pump
control arm.
The hydraulic system is under pressure, and the
oil will be hot.
• Always relieve pressure in the hydraulic
system before performing service.
• Failure to follow appropriate safety
precautions may result in death or serious
injury.
Required Tools and Materials
• Flow Meter
• -12 ORFS Test Hose 4000 psi (276 bar)
• Flow Lock Tool
Prevent personal injury. Use properly rated lifting
devices. Always be sure load is balanced before
lifting.
Support the machine properly using jack stands.
TN1329
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