Jacobsen AR3, Техническое руководство по ремонту

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6-36 4181384 First Edition
HYDRAULICS
6
9. Use the flow meter to warm the hydraulic oil. Turn the
flow meter valve (3) until a reading of 1525 psi (105
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.
10. Engage cutting unit switch.
11. Slowly close flow meter valve (3) until pressure
reaches 2300 psi (159 bar). Read and record the left
cutting unit motor loaded flow.
12. Open flow meter valve (3) and stop engine.
13. Calculate left front cutting unit motor leakage.
(Step 10 of mow/brake valve test – Step 11 / Step 10
of mow/brake valve test x 100 = Leak Percentage)
Is left front cutting unit motor leakage 10% or
less?
YES The left front cutting unit motor is good.
Proceed to step 14.
NO Proceed to next question.
Is left front cutting unit motor leakage 11% to
20%?
YES The left front cutting unit motor is marginal.
Additional testing is required.
NO Proceed to next question.
Is left front cutting unit motor leakage 21% or
more?
YES Replace left front cutting unit motor. (See
“Cutting Unit Motor” on page 6-46.)
14. Remove device or tool from left front cutting unit.
!
WARNING
15. Install suitable blocking device or tool in right front
cutting unit, preventing cutting unit from turning.
16. Open flow meter valve (3) completely.
NOTE
Verify engine rpm is within specification (3150 rpm ± 50)
to ensure accurate hydraulic test results.
17. Start engine and run at full throttle (3150 rpm ± 50).
18. Use the flow meter to warm the hydraulic oil. Turn the
flow meter valve (3) until a reading of 1525 psi (105
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.
19. Engage cutting unit switch.
20. Slowly close flow meter valve (3) until pressure
reaches 2300 psi (159 bar). Read and record the
right cutting unit motor loaded flow.
21. Open flow meter valve (3) and stop engine.
22. Calculate right front cutting unit motor leakage.
(Step 11 of left cutting unit motor test – Step 20 /
Step 11 x 100 = Leak Percentage)
Is right front cutting unit motor leakage 10% or
less?
YES The right front cutting unit motor is good.
Proceed to step 23.
NO Proceed to next question.
Is right front cutting unit motor leakage 11% to
20%?
YES The right front cutting unit motor is marginal.
Additional testing required.
NO Proceed to next question.
Is right front cutting unit motor leakage 21% or
more?
YES Replace right front cutting unit motor. (See
“Cutting Unit Motor” on page 6-46.)
23. Remove device or tool from right front cutting unit.
!
WARNING
24. Install suitable blocking device or tool in center rear
cutting unit, preventing cutting unit from turning.
25. Open flow meter valve (3) completely.
NOTE
Verify engine rpm is within specification (3150 rpm ± 50)
to ensure accurate hydraulic test results.
26. Start engine and run at full throttle (3150 rpm ± 50).
27. Use the flow meter to warm the hydraulic oil. Turn the
flow meter valve (3) until a reading of 1525 psi (105
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.
28. Engage cutting unit switch.
29. Slowly close flow meter valve (3) until pressure
reaches 2300 psi (159 bar). Read and record the
cutting unit/charge pump loaded flow.
30. Open flow meter valve (3) and stop engine.
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.
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.