Textron Jacobsen AR-5 Technical/Repair Manual

6-26 4181383 First Edition
HYDRAULICS
6
Figure 6-18
3. Install blocking disk between hose (1) and tee fitting
(3).
4. Open flow meter valve (2) completely.
5. Bypass seat switch.
NOTE
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 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.
!
CAUTION
8. Slowly close flow meter valve until pressure reaches
1950 psi (134 bar). Read and record the front cutting
units pump loaded flow.
9. Stop engine.
10. Calculate front cutting units pump leakage.
(Step 14 of previous test – Step 8 / Step 14 of
previous test x 100 = Leak Percentage)
Is front cutting units pump leakage 10% or less?
YES The front cutting units pump is good.
Proceed to next test.
NO Proceed to next question.
Is front cutting units pump leakage 11% to 20%?
YES The front cutting units pump is marginal.
Additional testing is required.
NO Proceed to next question.
Is front cutting units pump leakage 21% or more?
YES Repair or replace front 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.)
Front Cutting Units Circuit Valve
Tests
See Figures 6-19 and 6-20.
!
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.
Do not exceed 1950 psi (134 bar) when testing
pump or equipment damage may occur.
3
TN1363
2
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

Textron Jacobsen AR-5 Specifications

General

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