6-42 4203780 First Edition
HYDRAULICS
6
11. Calculate right wing cutting unit deck valve leakage.
(Step 9 of previous test – Step 9 / Step 9 of previous
test x 100 = Leak Percentage)
Is right wing cutting unit deck valve leakage 10%
or less?
YES The right wing cutting unit deck valve is
good. Proceed to step 12.
NO Proceed to next question.
Is right wing cutting unit deck valve leakage 11%
to 20%?
YES The right wing cutting unit deck valve is
marginal. Additional testing is required.
Proceed to step 12.
NO Proceed to next question.
Is right wing cutting unit deck valve leakage 21%
or more?
YES Repair or replace right wing cutting unit deck
valve. (See “Right Deck Valve” on
page 6-64.) Then proceed to step 12.
!
CAUTION
12. Start engine and run at full throttle (2800 rpm ± 50).
13. Enable wing mower deck switch and engage PTO
switch.
14. Continue to close flow meter valve (2) until zero flow
is obtained. Record cutting unit system relief valve
pressure.
15. Open flow meter valve (2), disengage switches, and
stop engine.
Is right wing cutting unit deck valve system relief
valve pressure 2700 psi (186 bar) to 3300 psi (228
bar)?
YES Right wing cutting unit deck valve system
relief valve is good. Proceed to “Right Wing
Cutting Unit Motors Test” on page 6-43.
NO Adjust right wing cutting unit deck valve
system relief pressure.
(See “Adjust Right
Wing Cutting Unit Deck Valve System Relief
Valve Pressure” on page 6-42.) Then
proceed to “Right Wing Cutting Unit Motors
Test” on page 6-43.
Adjust Right Wing Cutting Unit Deck
Valve System Relief Valve Pressure
See Figure 6-39.
!
WARNING
NOTE
This adjustment should be done in conjunction with right
cutting unit circuit valve tests.
1. Park the mower safely. (See “Park Mower Safely” on
page 1-6.)
2. Perform right wing cutting unit deck valve test. (See
“Right Wing Cutting Unit Deck Valve Test” on
page 6-40.)
Figure 6-39
3. Loosen nut (1).
Do not exceed 3350 psi (231 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
• -10 ORFS Test Hose 3600 psi (248 bar)
• -10 ORFS Tee Fitting
• -10 ORFS Blocking Disk
1
TN2060
2
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