Textron JACOBSEN GP400, Technical/Repair Manual

Page: 154 / 354

5-36 4252490-Rev A
HYDROSTATIC POWER TRAIN
5
Charge Pressure Test
See Figures 5-20 through 5-23.
!
WARNING
NOTE
Procedure is for 3WD models. Procedure for 2WD
models is the same except where noted.
1. Operate hydraulic system until oil temperature is
120–150° F (49–65° C).
2. Park the mower safely.
Figure 5-20: Traction Pump Fittings—3WD Models
Figure 5-21: Traction Pump Fittings—2WD Models
Figure 5-22
3. For 3WD models, remove cap (1) and connect test
hose and pressure gauge (5) to traction pump tee
fitting (2) at port “B.”
4. For 2WD models, remove cap (3) and connect test
hose and pressure gauge (5) to traction pump tee
fitting (4) at port “B.”
NOTE
Verify engine rpm is within specification (3400 rpm ± 50)
to ensure accurate hydraulic test results.
5. Start engine and run at full throttle (3400 rpm ± 50).
6. Record pressure reading.
7. Stop engine.
Is charge pressure 150–210 psi (10–15 bar)?
YES Charge pressure relief valve is good.
Proceed to step 11.
NO Inspect, repair, or replace charge pressure
relief valve. Proceed to step 8.
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)
1
TN3936
2
3
TN3920
4
TN1275
5