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Controls System
Maintenance
Adjusting the Cutting Unit
Lift/Drop
The cutting unit lift/drop circuit is equipped with a flow
control valve (Figure 58). This valve is preset at the
factory at approximately 3 turns open, but an adjustment
may be required to compensate for differences in
hydraulic oil temperatures, mowing speeds, etc. If an
adjustment is required, proceed as follows:
Figure 58
1. Flow control valve
Note: Allow the hydraulic oil to reach full operating
temperature before adjusting the flow control valve.
1. Raise the seat and locate the flow control valve for
the center pull frame (Figure 58) which is located
next to the hydraulic manifold.
2. Loosen the set screw on the adjusting knob on the
flow control.
3. Rotate the knob 1/4 turn counterclockwise if the
center cutting unit is dropping too late or 1/4 turn
clockwise if the center cutting unit is dropping too
early.
4. After the desired setting has been achieved, tighten
the set screw.
Adjusting the Lift Cylinders
To regulate the height of the front cutting units when in
the raised (transport) position, you can adjust the front
lift cylinders.
1. Lower the cutting units to the ground.
2. Loosen the jam nut on the clevis of the cutting unit
lift cylinder that needs to be adjusted.
3. Disconnect the cylinder clevis from the lift arm.
4. Rotate the clevis until you attain the desired height.
5. Connect the cylinder clevis to the lift arm and tighten
the jam nut.
40
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