Page 7
Attachment of Cutters
CAUTION:
Wear protective gloves when handling root cutter
blades.
All cutter units for O’Brien root cutters are attached to the motor shaft by means of a woodriff key
and a bolt and nut arrangement. The hub of the cutter must be slid over the key on the shaft which
drives the cutter. Align cross hole in hub with hole through shaft and insert bolt through hub and
secure with lock washer and nut. This prevents cutter pulling off when withdrawing unit.
CAUTION:
Do not try to drive cutters without drive key or by use of
bolt and nut only, as cutter could become loose and
lost in line or cause tile damage.
Skid Mounting
The O’Brien root cutter offers in a unique design, the mounting of plate runners to the body shell of the
root cutter by means of four removable pins which are locked in place by cotter keys (fig. 3). The main
motor need never be removed from the body shell to change skid sizes. By attaching the skid plates in
this manner, the hose end of the plates are projected downward and rearward to offer a large angle
projection over twice that of conventional skid units, thus offering greater protection to root cutter removal
in the event an offset or dropped line is encountered. Skid plates are stamped with pipe size of pipe
for easy selection.
NOTE:
Do not intermix skid plates on body shell. To simplify skid plate removal and
change, the snipping off of the end of the cotter key is recommended to remove same. Use only new
cotter keys for assembly (extra keys provided). As these are standard cotter keys, they may be
purchased locally for replacement.
Fig. 3
