HYDRAULICS
4203781 First Edition 6-55
6
Figure 6-57
4. Install tee fitting between fitting (1) and hose (2).
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 relief pressure 1500 psi (103 bar)?
YES Lift relief valve is good. Proceed to step 11.
NO Test lift/steer pump. (See “Lift/Steer Pump
Test” on page 6-55.) Test lift cylinders. (See
“Front Lift Cylinders Leakage Test” on
page 6-24.) Replace lift 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 relief pressure 1500 psi (103 bar)?
YES Steer relief valve is good. Proceed to
step 15.
NO Test lift/steer pump. (See “Lift/Steer Pump
Test” on page 6-55.) Test steer cylinder. (See
“Steering Leakage Test” on page 7-7.)
Repair or replace steer relief valve. (See
“Steering Relief Valve Pressure Test” on
page 7-6.)
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.)
Lift/Steer Pump Test
See Figures 6-58 through 6-60.
NOTE
Before performing this test, perform field test procedures.
(See “Field Test Procedures” on page 6-24.)
!
WARNING
1. Park the mower safely. (See “Park Mower Safely” on
page 1-6.)
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 relief valve over relief
longer than 10 seconds or damage may occur to
hydraulic system.
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
• Flow Meter
• -10 ORFS Test Hose 2000 psi (138 bar)
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