HYDRAULICS
4203781 First Edition 6-51
6
15. Open flow meter valve (2), disengage switches, and
stop engine.
Is left wing cutting unit deck valve system relief
valve pressure 2700 psi (186 bar) to 3300 psi (228
bar)?
YES Left wing cutting unit deck valve system relief
valve is good. Proceed to “Left Wing Cutting
Unit Motors Test” on page 6-52
NO Adjust left wing cutting unit deck valve
system relief valve pressure.
(See “Lift/Steer
Relief Valve Pressure Test” on page 6-54.)
Adjust Left Wing Cutting Unit Deck
Valve System Relief Valve Pressure
See Figure 6-52.
!
WARNING
NOTE
This adjustment should be done in conjunction with left
wing cutting unit deck valve test.
1. Park the mower safely. (See “Park Mower Safely” on
page 1-6.)
2. Perform left wing cutting unit deck valve test. (See
“Left Wing Cutting Unit Deck Valve Test” on
page 6-49.)
Figure 6-52
3. Loosen nut (1).
4. Rotate screw (2) to adjust the relief valve pressure
setting.
To increase the pressure setting: Turn the screw
in (clockwise).
To decrease the pressure setting: Turn the screw
out (counterclockwise).
5. Tighten nut (1).
Could relief valve be adjusted to 2700 psi (186
bar) to 3300 psi (228 bar)?
YES Left wing cutting unit deck valve system relief
valve is good. Proceed to “Left Wing Cutting
Unit Motors Test” on page 6-52.
NO Repair or replace left wing cutting unit deck
valve system relief valve. (See “Left Deck
Valve” on page 6-65.) Then proceed to “Left
Wing Cutting Unit Motors Test” on
page 6-52.
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
TN2301
2
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