Textron Jacobsen AR-5 Technical/Repair Manual

HYDRAULICS
4181383 First Edition 6-33
6
10. Calculate rear cutting units pump leakage.
(Step 14 of previous test – Step 8 / Step 14 of
previous test x 100 = Leak Percentage)
Is rear cutting units pump leakage 10% or less?
YES The rear cutting units pump is good. Proceed
to next test.
NO Proceed to next question.
Is rear cutting units pump leakage 11% to 20%?
YES The rear cutting units pump is marginal.
Additional testing is required.
NO Proceed to next question.
Is rear cutting units pump leakage 21% or more?
YES Repair or replace rear cutting units pump.
(See “Gear Pump” on page 6-41.)
11. Disconnect and remove test equipment. Install all
hoses and fittings as noted prior to removal.
12. Install and connect all components as noted prior to
test.
13. Check hydraulic oil level. Add oil as needed. (Refer to
“Safety, Operation, and Maintenance Manual” for
correct oil specifications.)
Rear Cutting Units Circuit Valve Tests
See Figures 6-27 and 6-28.
!
WARNING
1. Park the mower safely. (See “Park Mower Safely” on
page 1-5.)
2. Before performing this test, perform rear cutting units
circuit test, leaving flow meter connected as outlined.
Figure 6-27
3. Install blocking disk at fitting (1) on left rear cutting
unit motor, blocking oil flow from entering left rear
cutting unit motor.
Figure 6-28
4. Open flow meter valve (2) completely.
5. Bypass seat switch.
Verify engine rpm is within specification (2850 rpm ± 50)
to ensure accurate hydraulic test results.
6. Start engine and run at full throttle (2850 rpm ± 50).
7. Use the flow meter to warm the hydraulic oil. Turn the
flow meter valve (2) 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.
8. Disconnect park brake switch.
9. Engage cutting unit switch.
10. Slowly close flow meter valve (2) until pressure
reaches 1950 psi (134 bar). Read and record the
rear cutting units pump loaded flow.
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
• -10 ORFS Blocking Disk
TN1416
1
TN1363
2

Textron Jacobsen AR-5 Specifications

General

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