HYDROSTATIC POWER TRAIN
4203780 First Edition 5-35
5
Figure 5-22
3. Remove cover (1) to expose control valve.
Figure 5-23
4. Connect test hose and pressure gauge (3) to “SD”
test port (2).
5. Set park brake.
NOTE
Verify engine rpm is within specification (2800 rpm ± 50)
to ensure accurate hydraulic test results.
6. Start engine and run at full throttle (2800 rpm ± 50).
7. Record pressure reading.
8. Stop the engine.
Is charge pressure 240—250psi (16—17 bar)?
YES Charge pressure relief valve is good.
Proceed to step 9.
NO Charge pump or charge pressure relief valve
is at fault. Inspect, repair, or replace charge
pressure relief valve. Inspect, repair, or
replace charge pump as needed.
9. Disconnect and remove test equipment. Install all
hoses and fittings as noted prior to removal.
10. Install and connect all components as noted prior to
test.
11. Check hydraulic oil level. Add oil as needed. (Refer to
“Safety, Operation, and Maintenance Manual” for
correct oil specifications.)
Charge Pump Test
See Figures 5-24 through 5-26.
!
WARNING
1. Park the mower safely. (See “Park Mower Safely” on
page 1-6.)
2. Raise the seat.
Figure 5-24
3. Disconnect hose (1) from fitting (2).
TN1921
2
1
TN1275
3
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
• -10 ORFS Test Hose 2000 psi (138 bar)
TN1862
2
1
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