6-34 4181383 First Edition
HYDRAULICS
6
11. Calculate rear cutting units circuit valve leakage.
(Step 8 of previous test – Step 10 / Step 8 of
previous test x 100 = Leak Percentage)
Is rear cutting units circuit valve leakage 10% or
less?
YES The rear cutting units circuit valve is good.
Proceed to step 12.
NO Proceed to next question.
Is rear cutting units circuit valve leakage 11% to
20%?
YES The rear cutting units circuit valve is
marginal. Additional testing is required.
NO Proceed to next question.
Is rear cutting units circuit valve leakage 21% or
more?
YES Repair or replace deck valve. (See “Deck
Valve” on page 6-45.)
!
CAUTION
12. Continue to close flow meter valve (2) until zero flow
is obtained. Record cutting unit system relief valve
pressure.
13. Open flow meter valve (2) and stop engine.
Is cutting unit system relief valve pressure 2600
psi (179 bar)?
YES Cutting unit system relief valve is good.
Proceed to step 14.
NO Adjust cutting unit system relief pressure.
(See “Adjust Cutting Unit System Relief
Valve Pressure” on page 6-28.)
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.)
Rear Cutting Units Motors Test
See Figure 6-29.
IMPORTANT
• This test works together with the rear cutting
units circuit test to isolate a problem with the rear
cutting units circuit.
• Performing this test will isolate the rear cutting
unit motors from the rest of the rear cutting units
circuit.
!
WARNING
1. Park the mower safely. (See “Park Mower Safely” on
page 1-5.)
2. Before performing this test, perform rear cutting units
circuit test, leaving flow meter connected as outlined.
3. Bypass seat switch.
Do not exceed 2650 psi (183 bar) when testing
system relief valve or equipment damage may
occur.
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
• Flow Meter
• -8 ORFS Test Hose 3000 psi (207 bar)
• -8 ORFS Tee Fitting
• Blocking Device or Tool
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