20
Owner Service
MAN1289 (10/18/2019)
Blade Installation
(Figure 13)
Your dealer can supply genuine replacement
blades. Substitute blades may not meet original
equipment specifications and may be dangerous.
■
Crossbar rotation is counterclockwise when
looking down on cutter. Be sure to install blade cut-
ting edge to lead in counterclockwise rotation.
1.
Inspect blade pin (7) for nicks or gouges, and if you
find any, replace the blade pin.
2.
Insert blade pin through the blade (6). Blade
should swivel on blade pin; if it doesn’t, determine
the cause and correct.
3.
Align crossbar (2) 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. Push blade
pin through crossbar. Pin should rotate freely prior
to installing blade clip (12).
4.
Install shims (8, 9, 10) over blade pin.
NOTE:
Only use enough shims to allow keyhole
plate (11) to slide into blade pin groove.
5.
Install blade clip (12) over keyhole plate and into
blade pin groove.
6.
Secure into position with cap screw (13). Torque
cap screw to 85 lbs-ft.
7.
Repeat steps for opposite side.
NOTE:
Blade should be snug but should swivel on
pin without having to exert excessive force. Keep
any shims not used in the installation as replace-
ments or for future installation.
Blade Sharpening
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 14
. Blade Sharpening
SLIP CLUTCH ADJUSTMENT
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:
Compression Spring Style Clutch
1.
Turn off tractor engine and remove key.
2.
Loosen nuts on springs until the springs can rotate
freely, yet remain secure on the bolts.
3.
Mark outer plates of slip-disc clutch as shown in
Figure 15.
4.
Securely attach implement to the tractor and start
the tractor.
5.
Engage PTO for several seconds then quickly
disengage it.
6.
Turn tractor off and remove key.
7.
The friction lining plates should have "slipped".
Check the marks placed on the outer plates of the
slip-disc clutch in step 3 to make sure this is the
case.
8.
If clutch does not slip, check assembly for oil,
grease and debris. Clean if necessary.
9.
Reassemble clutch and tighten bolts no more than
1/8 of a turn at a time until desired setting of 1.12"
on BB48.30, BB60.30, and BB72.30 cutters is
reached. For BB84.40 cutters, set to 1.24". See
Figure 15.
10.
If excessive slippage continues, check lining plates
for excessive wear. They are 1/8" thick when new
and should be replaced after 1/32" of wear to
ensure proper operation.
CAUTION
