HYDROSTATIC POWER TRAIN
4181383 First Edition 5-15
5
Charge Pressure Test
See Figures 5-9 and 5-11.
!
WARNING
1. Operate hydraulic system until oil temperature is at
120—150°F (49—65°C).
2. Park the mower safely. (See “Park Mower Safely” on
page 1-5.)
3. Remove the center floorboard.
Figure 5-9
Figure 5-10
4. Connect adapter, test hose, and pressure gauge (2)
to port (1).
NOTE
Verify engine rpm is within specification (2850 rpm ± 50)
to ensure accurate hydraulic test results.
5. Start engine and run at full throttle (2850 rpm ± 50).
6. Record pressure reading.
7. Stop the engine.
Is charge pressure 275–285 psi (19–20 bar)?
YES Charge pressure relief valve is good.
Proceed to step 10.
NO Proceed to next step.
Figure 5-11
8. Insert blocking disk at the “H” port (3) of the 4WD
valve and retest charge pressure.
Is charge pressure 275–285 psi (19–20 bar)?
YES Inspect, repair, or replace hot oil shuttle.
(See “4WD Valve” on page 5-32.)
NO Inspect, repair, or replace charge relief valve.
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
• Pressure Gauge 500 psi (35 bar)
• Test Hose 500 psi (35 bar)
• -6 ORB Adapter
• -6 ORFS Blocking Disk
TN1395
1
TN1275
2
TN1706
3