Textron Jacobsen HR-5111 - Page 301

HYDRAULICS
4203780 First Edition 6-55
6
Figure 6-57
4. Install tee fitting between fitting (2) and hose (1).
5. Connect test hose from tee fitting to pressure gauge
(3).
6. Set park brake.
NOTE
Verify engine rpm is within specification (2800 rpm ± 50)
to ensure accurate hydraulic test results.
7. Start engine and run at full throttle (2800 rpm ± 50).
!
CAUTION
8. Raise the front deck and hold lever in the raise
position.
9. Record pressure reading.
10. Stop engine.
Is lift system relief pressure 1500 psi (103 bar)?
YES Lift system relief valve is good. Proceed to
step 12.
NO Test lift/steer pump. (See “Lift/Steer Pump
Test” on page 6-56.) Test lift cylinders. (See
“Front Lift Cylinders Leakage Test” on
page 6-24.) Replace lift system relief valve.
(See “Lift Valve” on page 6-62.)
NOTE
Verify engine rpm is within specification (2800 rpm ± 50)
to ensure accurate hydraulic test results.
11. Start engine and run at full throttle (2800 rpm ± 50).
!
CAUTION
12. Turn the steering wheel fully right against stop.
13. Record pressure reading.
14. Stop engine.
Is steer system relief pressure 1450 psi (100
bar)?
YES Steer system relief valve is good. Proceed to
step 15.
NO Test lift/steer pump. (See “Lift/Steer Pump
Test” on page 6-56.) Test steer cylinder. (See
“Steering Leakage Test” on page 7-7.)
Repair or replace steering valve. (See
“Steering Valve” on page 7-8.)
15. Disconnect and remove test equipment. Install all
hoses and fittings as noted prior to removal.
16. Install and connect all components as noted prior to
test.
17. Check hydraulic oil level. Add oil as needed. (Refer to
“Safety, Operation, and Maintenance Manual” for
correct oil specifications.)
Do not run mower lift system relief valve over
relief longer than 10 seconds or damage may
occur to hydraulic system.
TN1275
3
Do not run mower steer system relief valve over
relief longer than 10 seconds or damage may
occur to hydraulic system.