User Guide

18 Operation
MAN0654 (Rev. 10/19/2007)
DRIVELINE ADJUSTMENT
BB840XP (PULL-TYPE)
With the cutting height established, adjust the driveline
carrier bearings in the H-frames so that the front drive-
line is parallel to the ground with cutter in cutting posi-
tion.
TRANSPORTING BB840XP (PULL-TYPE)
Figure 10. Transport Lock Operation
1. Always transport with cutter in raised, locked
position.
2. Raise cutter with hydraulic cylinder to max height.
3. Rotate transport lock into position over cylinder
rod. See Figure 10.
4. Lower cylinder against transport lock.
5. To lower cutter for operation, extend hydraulic
cylinder. Rotate transport lock back away from
cylinder rod.
6. Lower cutter to desired cutting height.
OPERATING TECHNIQUE
1. Power for operating the cutter is supplied by the
tractor PTO. Operate PTO at 540 rpm. Know how
to stop the tractor and cutter quickly in an
emergency.
2. Engage PTO at a low engine rpm to minimize
stress on the drive system and gearbox. With PTO
engaged, raise PTO speed to 540 rpm and
maintain throughout cutting operation.
Gearbox protection is provided by a slip clutch with
replacement fiber disc. The slip clutch is designed
to slip when excessive torsional loads occur.
3. Move slowly into material. Adjust tractor ground
speed to provide a clean cut without lugging the
tractor engine. Use a slow ground speed for better
shredding.
Proper ground speed will depend on the terrain
and the material’s height, type, and density.
Normally, ground speed will range from 2 to 5 mph.
Tall, dense material should be cut at a low speed;
thin, medium-height material can be cut at a faster
ground speed.
4. Always operate tractor PTO at 540 rpm to maintain
proper blade speed and to produce a clean cut.
5. Under certain conditions tractor tires may roll down
some grass and prevent cutting at the same height
as the surrounding area. When this occurs, reduce
your ground speed but maintain PTO at 540 rpm.
The lower ground speed will permit grass to
rebound partially.
SHREDDING MATERIAL
For shredding, set the cutter lower at rear. Determine
how much lower to set the rear by experimenting in dif-
ferent situations.
STORAGE
Mounted Cutters
 Disconnect cutter driveshaft and secure up off
ground. Raise cutter with 3-point hitch. Place
blocks under cutter side skids. Lower cutter onto
blocks. Disconnect cutter from tractor 3-point hitch
and carefully drive tractor away from cutter.
 Keep children and bystanders away from stor-
age area.
BB840XP (Pull-Type)
 Raise cutter and block securely. Block wheels
and raise tongue with jack. Disconnect hydraulic
lines to optional cylinder. Disconnect driveline and
secure up off the ground.
DP1