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
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
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.
22 Owner Service
(Rev. 10/31/2008) MAN0654 (Rev. 10/19/2007)
