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22 Owner Service
MAN0764 (11/5/2008)
Blade Sharpening (Figure 7)
NOTICE
When sharpening blades, grind the same
amount on each blade to maintain balance.
Replace blades in pairs. Unbalanced blades will
cause excessive vibration, which can damage
gearbox bearings. Vibration may also cause struc-
tural cracks to cutter.
1. Sharpen both blades at the same time to maintain
balance. Follow original sharpening pattern.
2. Do not sharpen blade to a razor edge—leave at
least a 1/16" blunt edge.
3. Do not sharpen back side of blade.
Figure 7. Blade Sharpening
SLIP CLUTCH ADJUSTMENT (Figure 8)
The slip clutch is designed to slip so that the gearbox
and driveline are protected if the cutter strikes an
obstruction.
A new slip clutch or one that has been in storage over
the winter may seize. Before operating the cutter, make
sure it will slip by performing the following operation:
1. Turn off tractor engine and remove key.
2. Tighten four nuts (12) to remove pressure from the
clutch plates (2). Repeat for all three clutches.
3. Start tractor at low throttle and slowly engage PTO
and allow clutches to slip for 5 seconds. Disengage
PTO and turn off tractor engine.
4. If clutches slip freely, completely loosen nuts (12).
5. If clutch does not slip freely, disassemble and
clean plates (4, 6, 7), flange yoke (1), and clutch
hub (3).
6. Reassemble clutch.
7. Tighten Belleville spring (5) with nuts (11) until it is
against the thrust plate (4) of the clutch. Back off
each of the four nuts (11) until gap between
Belleville spring and thrust plate is .180 or 3/16” as
shown in Figure 8.
8. If a clutch continues to slip when the spring is
compressed to .180 or 3/16” gap, check friction
discs (2) for excessive wear. Discs are 1/8" when
new. Replace discs after 1/16" wear. Minimum disc
thickness is 1/16".
NOTE: When storing cutter for long periods of time,
relieve the pressure on the clutch discs by tightening
the four nuts (12) on each clutch. Completely loosen
nuts (12) to return to service.
Figure 8. Slip Clutch Assembly
Follow Original Pattern
Maintain Corner
1/16"
CD1257-2
1. Flange yoke
2. Friction disc
3. Hub, 1-3/4 splined
4. Thrust plate
5. Belleville spring plate
6. Drive plate
7. Drive plate
8. Backup plate
9. Lock assembly
10. M12 x 1.75P x 85 mm
Hex head cap screw
11. M12 x 1.75P Hex lock nut
12. M8 x 1.25P Hex nut