Jacobsen AR3, Technical/Repair Manual

Page: 228 / 342

HYDRAULICS
4181384 First Edition 6-37
6
31. Calculate center rear cutting unit motor leakage.
(Step 20 of right cutting unit motor test – Step 29 /
Step 20 x 100 = Leak Percentage)
Is center rear cutting unit motor leakage 10% or
less?
YES The center rear cutting unit motor is good.
Proceed to step 32.
NO Proceed to next question.
Is center rear cutting unit motor leakage 11% to
20%?
YES The center rear cutting unit motor is
marginal. Replace as needed.
NO Proceed to next question.
Is center rear cutting unit motor leakage 21% or
more?
YES Replace center rear cutting unit motor. (See
“Cutting Unit Motor” on page 6-46.)
32. Disconnect and remove test equipment. Install all
hoses and fittings as noted prior to removal.
33. Check hydraulic oil level. Add oil as needed. (Refer to
“Safety, Operation, and Maintenance Manual” for
correct oil specifications.)
Late Model 30002 AR-3
See Figures 6-30 and 6-31.
!
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 6-30
5. Remove blocking disk from location (2) and
reconnect hose (1).
!
WARNING
6. Install suitable blocking device or tool in right front
cutting unit, preventing cutting unit from turning.
Figure 6-31
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 (276 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
2
TN1363
3