Textron Jacobsen AR-5 Technical/Repair Manual

6-36 4181383 First Edition
HYDRAULICS
6
23. Calculate center cutting unit motor leakage.
(Step 10 – Step 21 / Step 10 x 100 = Leak
Percentage)
Is center cutting unit motor leakage 10% or less?
YES The center cutting unit motor is good.
Proceed to step 24.
NO Proceed to next question.
Is center cutting unit motor leakage 11% to 20%?
YES The center cutting unit motor is marginal.
Additional testing required.
NO Proceed to next question.
Is center cutting unit motor leakage 21% or
more?
YES Repair or replace center cutting unit motor.
(See “Cutting Unit Motors” on page 6-43.)
24. Remove device or tool from center cutting unit.
!
WARNING
25. Install suitable blocking device or tool in right rear
cutting unit, preventing cutting unit from turning.
26. Open flow meter valve (3) completely.
27. Connect park brake switch.
NOTE
Verify engine rpm is within specification (2850 rpm ± 50)
to ensure accurate hydraulic test results.
28. Start engine and run at full throttle (2850 rpm ± 50).
29. Use the flow meter to warm the hydraulic oil. Turn the
flow meter valve (3) 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.
30. Disconnect park brake switch.
31. Engage cutting unit switch.
32. Slowly close flow meter valve (3) until pressure
reaches 1950 psi (134 bar). Read and record the
right rear cutting unit motor loaded flow.
33. Open flow meter valve (3) and stop engine.
34. Calculate right rear cutting unit motor leakage.
(Step 21 – Step 32 / Step 21 x 100 = Leak
Percentage)
Is right rear cutting unit motor leakage 10% or
less?
YES The right rear cutting unit motor is good.
Proceed to step 35.
NO Proceed to next question.
Is right rear cutting unit motor leakage 11% to
20%?
YES The right rear cutting unit motor is marginal.
Proceed to step 35.
NO Proceed to next question.
Is right rear cutting unit motor leakage 21% or
more?
YES Repair or replace right rear cutting unit
motor. (See “Cutting Unit Motors” on
page 6-43.)
35. Remove device or tool from right rear cutting unit.
36. Disconnect and remove test equipment. Install all
hoses and fittings as noted prior to removal.
37. Install and connect all components as noted prior to
test.
38. Check hydraulic oil level. Add oil as needed. (Refer to
“Safety, Operation, and Maintenance Manual” for
correct oil specifications.)
Lift/Steer System Relief Valve
Pressure Test
See Figures 6-30 and 6-31.
!
WARNING
1. Operate hydraulic system until oil temperature is at
120—150°F (49—65°C).
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
• Pressure Gauge 5000 psi (345 bar)
• -8 ORFS Test Hose 5000 psi (345 bar)

Textron Jacobsen AR-5 Specifications

General

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