Lift System Test - Jacobsen AR-3 Technical/Repair Manual

HYDRAULICS
9. Stop engine.
Is lift/steer system relief pressure 1595 psi (110
bar)?
YES Lift/steer system relief valve is good.
Proceed to step 10.
NO Test lift/steer pump. (See "Lift/Steer Pump
Test" on page 6-41.) Test lift cylinder. (See
"Lift Cylinder Leakage Test" on page 6-28.)
Replace steering valve. (See "Steering
Valve" on page 7-7.)
10. Disconnect and remove test equipment. Install all
hoses and fittings as noted prior to removal.
11. Check hydraulic oil level. Add oil as needed. (Refer to
"Safety, Operation, and Maintenance Manual" for
correct oil specifications.)

Lift System Test

See Figures 6-34 and 6-35.
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.
6
Required Tools and Materials
• Flow Meter
• Test Hose 2000 psi (138 bar)
• Tee Fitting
• Blocking Disk
1. Park the mower safely. (See "Park Mower Safely" on
page 1-7.)
2. Raise seat platform.
3. Bypass seat switch.
6-40
!
WARNING
Figure 6-34
4. Disconnect hose (2) from fitting (1).
6
Figure 6-35
5. Install tee fitting (5) to fitting (1).
6. Connect flow meter inlet test hose (6) and hose (2) to
tee fitting (5).
NOTE
Make sure hose end is under oil level in hydraulic tank to
prevent aeration of oil.
7. Connect flow meter outlet test hose (3) to the
hydraulic tank.
8. Open flow meter valve (4) completely.
NOTE
Verify engine rpm is within specification (3150 rpm ± 50)
to ensure accurate hydraulic test results.
9. Start engine and run at full throttle (3150 rpm ± 50).
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TN1241
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4
5
TN1363
4181384 First Edition