HYDRAULICS
4181384 First Edition 6-43
6
11. Calculate lift valve leakage.
(Step 7 of previous test – Step 9 / Step 7 of previous
test x 100 = Leak Percentage)
Is lift valve leakage 10% or less?
YES The lift valve is good. Proceed to step 12.
NO Proceed to next question.
Is lift valve leakage 11% to 20%?
YES The lift valve is marginal. Repair or replace
as needed.
NO Proceed to next question.
Is lift valve leakage 21% or more?
YES Repair or replace lift valve. (See “Lift Valve”
on page 6-46.)
12. Disconnect and remove test equipment. Install all
hoses and fittings as noted prior to removal.
13. Check hydraulic oil level. Add oil as needed. (Refer to
“Safety, Operation, and Maintenance Manual” for
correct oil specifications.) Mow/Brake Valve Relief
Pressure Adjustment.
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