HYDRAULICS
4203781 First Edition 6-43
6
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 right wing cutting unit deck valve system
relief valve be adjusted to 2700–3300 psi (186–
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 Repair or replace right wing cutting unit deck
valve system relief valve. (See “Right Deck
Valve” on page 6-64.) Then proceed to
“Right Wing Cutting Unit Motors Test” on
page 6-43.
Right Wing Cutting Unit Motors Test
See Figures 6-40 through 6-42.
IMPORTANT
• This test works together with the right wing
cutting unit circuit test to isolate a problem with
the right wing cutting units motors.
• Performing this test will isolate the right wing
cutting unit motors from the rest of the right wing
cutting units circuit.
!
WARNING
1. Park the mower safely. (See “Park Mower Safely” on
page 1-6.)
2. Before performing this test, perform right wing cutting
unit deck valve test, leaving flow meter connected as
outlined.
3. Bypass seat switch and set park brake.
!
WARNING
4. Install suitable blocking device or tool in right wing
cutting unit outside motor, preventing right wing
cutting unit outside motor from turning.
Figure 6-40
5. Open flow meter valve (1) completely.
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 (255 bar)
• -10 ORFS Tee Fitting
• Blocking Device or Tool
Safely block cutting unit from rotating using a
suitable device or tool. Failure to follow
appropriate safety precaution may result in death
or serious injury.
TN1363
1
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