6-54 4203781 First Edition
HYDRAULICS
6
21. Calculate left outside cutting unit motor leakage.
(Step 9 – Step 19 / Step 9 x 100 = Leak Percentage)
Is left outside cutting unit motor leakage 10% or
less?
YES The left outside cutting unit motor is good.
Proceed to step 22.
NO Proceed to next question.
Is left outside cutting unit motor leakage 11% to
20%?
YES The left outside cutting unit motor is
marginal. Determine component(s) with
greatest leakage and repair or replace
component(s) as necessary.
NO Proceed to next question.
Is left outside cutting unit motor leakage 21% or
more?
YES Repair or replace left outside cutting unit
motor. (See “Deck Motors” on page 6-62.)
22. Remove device or tool from left cutting unit outside
motor.
23. Disconnect and remove test equipment. Install all
hoses and fittings as noted prior to removal.
24. Install and connect all components as noted prior to
test.
25. Check hydraulic oil level. Add oil as needed. (Refer to
“Safety, Operation, and Maintenance Manual” for
correct oil specifications.)
Lift/Steer Relief Valve Pressure Test
See Figures 6-56 and 6-57.
NOTE
Before performing this test, perform field test procedures.
(See “Field Test Procedures” on page 6-24.)
!
WARNING
1. Operate hydraulic system until oil temperature is at
120–150° F (49–65° C).
2. Park the mower safely. (See “Park Mower Safely” on
page 1-6.)
3. Raise the seat and seat platform.
Figure 6-56
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)
• -10 ORFS Test Hose 5000 psi (345 bar)
• -10 ORFS Tee Fitting
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