Textron JACOBSEN GP400, Technical/Repair Manual

Page: 232 / 354

6-40 4252490-Rev A
HYDRAULICS
6
Figure 6-36
4. Connect tee fitting to traction pump port “V1” (1).
5. Connect hose (2) to tee fitting.
6. Connect test hose and pressure gauge (3) to tee
fitting.
7. Bypass seat switch and apply park brake.
Figure 6-37: Implement Relief Valve Pressure Test
NOTE
Verify engine rpm is within specification (3400 rpm ± 50)
to ensure accurate hydraulic test results.
8. Start engine and run at full throttle (3400 rpm ± 50).
!
CAUTION
9. Turn the steering wheel fully right against stop.
10. Record pressure reading.
11. Stop engine.
Is implement relief pressure 800 ± 10% psi (55 ±
10% bar)?
YES Implement relief valve is good. Proceed to
step 12.
NO Test charge pressure. (See “Charge
Pressure Test” on page 5-36.) Test steer
cylinder. (See “Steering Leakage Test” on
page 6-29.) Repair or replace implement
relief valve. (See “Steering Unit” on
page 7-6.)
12. Disconnect and remove test equipment. Install all
hoses and fittings as noted prior to removal.
13. Install and connect all components as noted prior to
test.
14. Check hydraulic oil level. Add oil as needed. (Refer
to “Parts and Maintenance Manual” for correct oil
specifications.)
TN1275
3
TN3979
Do not run implement relief valve over relief
longer than 10 seconds or damage may occur to
hydraulic system components.