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22 Owner Service
MAN0654 (Rev. 10/19/2007)
3. Align crossbar assembly (3) with blade access hole
in cutter frame. Apply a liberal coating of Never
Seez
®
or equivalent to blade pin and crossbar
hole. Make sure blade offset is away from cutter.
4. Insert blade pin (1) through blade. Push blade pin
through crossbar.
5. Install shims (4 & 5) over blade pin.
NOTE: Only use enough shims to allow keyhole
plate (6) to slide into blade pin groove.
6. Install blade clip (7) over keyhole plate and into
blade pin groove.
7. Secure into position with cap screw (8). Torque cap
screw to 85 lbs-ft.
8. Repeat steps for opposite side.
NOTE: Blade should be snug but should swivel on
pin without having to exert excessive force. Keep
any spacers not used in the installation as replace-
ments or for future installation.
Blade Sharpening
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 13. Blade Sharpening
SLIP CLUTCH ADJUSTMENT
Mounted Cutters & BB840XP S/N 1127329
& Above (Figure 14)
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. Remove driveline from tractor PTO.
3. Loosen six 10 mm cap screws (6) to remove all
tension from Belleville spring plate (5).
4. Hold clutch hub (3) solid and turn shaft to make
sure clutch slips.
5. If clutch does not slip freely, disassemble and clean
the thrust plate faces (4), flange yoke (1), and
clutch hub (3).
6. Reassemble clutch.
7. Tighten Belleville spring (5) until it is against the
thrust plate (4) of the clutch, and then back off each
of the six nuts by 2 full revolutions. The gap
between Belleville spring and thrust plate should
be 1/8" as shown in Figure 14.
8. If a clutch continues to slip when the spring is
compressed to 1/8" cap, 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"
SLIP CLUTCH ADJUSTMENT
BB840XP S/N 1127328 & Below (Figure 15)
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. Remove driveline from tractor PTO.
3. Loosen six 12 mm cap screws (7) to remove all
tension from the compression springs (8).
4. Hold clutch hub (3) solid and turn shaft to make
sure clutch slips.
(Rev. 10/31/2008)