Textron Jacobsen AR-5 Technical/Repair Manual

HYDRAULICS
4181383 First Edition 6-25
6
6. Connect flow meter outlet hose (3) to the hydraulic
tank.
!
WARNING
7. Install suitable blocking device or tool in right front
cutting unit, preventing cutting unit from turning.
Open flow meter valve (4) completely.
8. Bypass seat switch.
NOTE
Verify engine rpm is within specification (2850 rpm ± 50)
to ensure accurate hydraulic test results.
9. Start engine and run at full throttle (2850 rpm ± 50).
10. Use the flow meter to warm the hydraulic oil. Turn the
flow meter valve (4) until a reading of 1300 psi (90
bar) or one half of the relief valve rating is reached.
Warm oil to 120—150°F (49—65°C); open valve fully
after operating temperature is reached.
11. Disconnect park brake switch.
12. Engage cutting unit switch.
13. Read and record the front cutting units pump no load
flow.
14. Slowly close flow meter valve (4) until pressure
reaches 1950 psi (134 bar). Read and record the
front cutting units pump loaded flow.
15. Open flow meter valve (4) and stop engine.
16. Calculate front cutting units circuit leakage.
(Step 13 – Step 14 / Step 13 x 100 = Leak
Percentage)
Is front cutting units circuit leakage 10% or less?
YES The front cutting units circuit is good.
Proceed to “Front Cutting Units Motors Test”
on page 6-28.
NO Proceed to next question.
Is front cutting units circuit leakage 11% to 20%?
YES The front cutting units circuit is marginal.
Additional testing is required.
NO Proceed to next question.
Is front cutting units circuit leakage 21% or
more?
YES Test individual components in front cutting
units circuit for leakage.
17. Disconnect and remove test equipment. Remove
blocking device or tool from cutting unit. Install all
hoses and fittings as noted prior to removal.
18. Install and connect all components as noted prior to
test.
19. Check hydraulic oil level. Add oil as needed. (Refer to
“Safety, Operation, and Maintenance Manual” for
correct oil specifications.)
Front Cutting Units Pump Test
See Figures 6-17 and 6-18.
!
WARNING
1. Park the mower safely. (See “Park Mower Safely” on
page 1-5.)
2. Before performing this test, perform front cutting units
circuit test leaving flow meter connected as outlined.
Figure 6-17
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.
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
• -8 ORFS Test Hose 3000 psi (207 bar)
• -8 ORFS Tee Fitting
• -8 ORFS Blocking Disk
TN1410
1

Textron Jacobsen AR-5 Specifications

General

Brand	Textron
Model	Jacobsen AR-5
Category	Lawn Mower
Language	English