6-48 673831-Rev A
HYDRAULICS
6
9. Open flow meter valve (4) completely. Read and
record the lift/steer pump no load flow.
10. Slowly close flow meter valve (4) until a pressure of
1575 psi (109 bar) or 75% of the relief valve rating is
reached. Read and record the lift/steer pump loaded
flow.
11. Open flow meter valve and stop engine.
12. Calculate lift/steer pump leakage.
(Step 9 – Step 10 / Step 9 x 100 = Leak Percentage)
Is lift/steer pump leakage 10% or less?
YES The lift/steer pump is good. Proceed to
step 13.
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 6-23.)
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 6-49.)
13. Disconnect and remove test equipment. Install all
hoses and fittings as noted prior to removal.
14. Install and connect all components as noted prior to
test.
15. Check hydraulic oil level. Add oil as needed. (Refer to
“Parts and Maintenance Manual” for correct oil
specifications.)
16. Start engine. Check hydraulic system for leaks.
Repair as necessary.
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