Textron JACOBSEN GP400, Technical/Repair Manual

Page: 233 / 354

HYDRAULICS
4252490-Rev A 6-41
6
Lift Relief Valve Pressure Test
See Figures 6-38 through 6-40.
NOTE
Before performing this test, perform field test procedures.
(See “Field Test Procedures” on page 6-28.)
!
WARNING
1. Operate hydraulic system until oil temperature is
120–150° F (49–65° C).
2. Park the mower safely. (See “Park Mower Safely” on
page 1-6.)
Figure 6-38
3. Remove cap from test port (1) at gear pump.
Figure 6-39
4. Connect test hose and pressure gauge (2) to test
port (1).
5. Apply park brake.
Figure 6-40: Lift Relief Valve Pressure Test
NOTE
Verify engine rpm is within specification (3400 rpm ± 50)
to ensure accurate hydraulic test results.
6. Start engine and run at full throttle (3400 rpm ± 50).
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 2000 psi (138 bar)
• Test Hose 2000 psi (138 bar)
TN3920
1
TN1275
2
TN3102