HYDRAULICS
4203780 First Edition 6-57
6
!
CAUTION
9. Use the flow meter to warm the hydraulic oil. Turn the
flow meter valve (4) until a reading of 750 psi (52 bar)
or one half of the relief valve rating is reached. Warm
oil to 120—150° F (49—65° C).
10. Open flow meter valve (4) completely. Read and
record the lift/steer pump no load flow.
11. Slowly close flow meter valve (4) until pressure
reaches 1125 psi (78 bar). Read and record the
lift/steer pump loaded flow.
12. Open flow meter valve (4) and stop engine.
13. Calculate lift/steer pump leakage.
(Step 10 – Step 11 / Step 10 x 100 = Leak
Percentage)
Is lift/steer pump leakage 10% or less?
YES The lift/steer pump is good. Proceed to
step 14.
NO Proceed to next question.
Is lift/steer pump leakage 11% to 20%?
YES The lift/steer pump is marginal. Additional
testing is required. (See “Field Test
Procedures” on page 6-24.)
NO Proceed to next question.
Is lift/steer pump leakage 21% or more?
YES Repair or replace lift/steer pump. (See “Gear
Pump” on page 6-58.)
14. Disconnect and remove test equipment. Install all
hoses and fittings as noted prior to removal.
15. Install and connect all components as noted prior to
test.
16. Check hydraulic oil level. Add oil as needed. (Refer to
“Safety, Operation, and Maintenance Manual” for
correct oil specifications.)
Do not exceed 1500 psi (103 bar) as this test does
not utilize system relief.
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