Controls System Maintenance; Adjusting The Cutting Unit Lift/Drop; Backlapping - Toro 04383 Operator's Manual

Controls System
Maintenance
Adjusting the Cutting Unit
Lift/Drop
The cutting unit lift/drop circuit is equipped with a flow
control valve (Figure 55). This valve is preset at the factory
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:
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 55) which is located on the
side of the hydraulic manifold.
2. Loosen the jam nut on the flow control valve.
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
jam nut.
Figure 55
1. Flow control valve

Backlapping

WARNING
Contact with the reels or other moving parts can
result in personal injury.
• Keep fingers, hands, and clothing away from the
reels or other moving parts.
• Never attempt to turn the reels by hand or foot
while the engine is running.
1. Position the machine on a level surface, lower the
cutting units, stop the engine, engage the parking brake.
2. Unlock and raise the seat to expose the controls.
3. Make initial reel to bedknife adjustments appropriate
for backlapping on all cutting units which are to be
backlapped; refer to the Cutting Unit Operator's Manual.
DANGER
Changing the engine speed while backlapping
may cause the reels to stall.
• Never change the engine speed while
backlapping.
• Only backlap at idle engine speed.
4. Start the engine and run at low idle speed.
5. Rotate the Backlap Lever to the "R" position
(Figure 56).
1. Backlap lever
6. Rotate the Reel Speed Control to setting 1 (Figure 56).
7. With the functional control lever in the neutral position,
move the Raise/Lower Mow control forward to start
the backlapping operation on the designated reels.
8. Apply lapping compound with a long handle brush.
Never use a short handled brush.
9. If the reels stall or become erratic while backlapping,
select a higher reel speed setting until the speed
stabilizes, then return the reel speed to setting 1 or to
your desired speed.
10. To make an adjustment to the cutting units while
backlapping, turn the reels off by moving the
Raise/Lower Mow control rearward and stop the
engine. After completing adjustments, repeat steps 4
through 8.
11. Repeat the procedure for all cutting units you want to
backlap.
12. When finished, return the backlap levers to the
"F" position, lower the seat, and wash all lapping
44
Figure 56
2. Reel speed control