Jacobsen AR3, Technical/Repair Manual

Page: 226 / 342

HYDRAULICS
4181384 First Edition 6-35
6
• To increase the pressure setting: Turn the screw in
(clockwise).
• To decrease the pressure setting: Turn the screw out
(counterclockwise).
6. Tighten lock nut (2).
7. Relief valve pressure reading should be:
30001 AR-3—3046 psi (210 bar)
30002 AR-3—3626 psi (250 bar)
TR-3—3046 psi (210 bar)
Could relief valve be adjusted to specification?
YES Mow/brake relief valve is good. Proceed to
step 8.
NO Repair or replace mow/brake relief valve.
(See “Mow/Brake Valve” on page 6-50.)
8. Disconnect and remove test equipment. Install all
hoses and fittings as noted prior to removal.
9. Check hydraulic oil level. Add oil as needed. (Refer to
“Safety, Operation, and Maintenance Manual” for
correct oil specifications.)
Cutting Unit Motors Test
TR-3 and Early Model 30001 AR-3
See Figures 6-28 and 6-29.
!
WARNING
1. Park the mower safely. (See “Park Mower Safely” on
page 1-7.)
2. Before performing this test, perform cutting unit
system test leaving flow meter connected as
outlined.
3. Raise seat platform.
4. Bypass seat switch.
Figure 6-28
5. Remove blocking disk from fitting (1) and reconnect
hose.
!
WARNING
6. Install suitable blocking device or tool in left front
cutting unit, preventing cutting unit from turning.
Figure 6-29
7. Open flow meter valve (3) completely.
NOTE
Verify engine rpm is within specification (3150 rpm ± 50)
to ensure accurate hydraulic test results.
8. Start engine and run at full throttle (3150 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
• Flow Meter
• Test Hose 3000 psi (207 bar)
• Tee Fitting
• Blocking Disk
Safely block cutting unit from rotating using a
suitable device or tool. Failure to follow
appropriate safety precaution may result in death
or serious injury.
TN1362
1
TN1363
3