22 Dealer Service
29977 (Rev. 1/23/2009)
Removing Gearbox from Cutter
Remove safety shielding. Remove top cover and
siphon gear lube from gearbox. Remove drive lines.
Remove crossbar (see Crossbar Removal). Remove
gearbox from cutter.
Gearbox Assembly - Cutter Head
Press cups into main housing until they seat against
machined shoulders. Press bearings onto shafts until
they seat against machined surface next to gear.
Install vertical shaft into gearbox housing, and horizon-
tal shaft into horizontal housing, then press bearings on
with sleeve until all free play is removed (similar to
adjusting front wheel bearings on an automobile).
Check by spinning housing. It should turn freely.
If bearings are too tight, hold housing and rap gear
shaft with a lead hammer. Do not leave bearings
adjusted too tight. Proper adjustment is essential to
good bearing lift.
Install the vertical and horizontal shaft seals.
After seating the seal on the vertical shaft, depending
on when the gearbox was manufactured there are two
options:
1. Place a 1-5/8 ID x 2-31/32 OD washer over the
shaft and into the neck of the gearbox housing. You
will need to tap this washer in place until the
gearbox is installed on the cutter.
2. Press a 1-5/8 ID x 2-3/4 OD washer and a washer
retainer firmly against the seal.
Bearing adjustment on the vertical shaft is set with the
sleeve and maintained with proper crossbar shimming.
Bearing adjustment on the horizontal shaft is set with
the sleeve and maintained by tightening a large hex nut
against the sleeve, installing a dowel plug in the nut
and tightening a set screw against the dowel. Prior to
installing the nut, clean the threads on the nut and the
shaft and apply two drops of Loctite on the threads.
Horizontal Housing Installation
With the housing assembled, place the square O-ring
on the housing and install to gearbox, tighten the four
bolts evenly. Turn the gears against each other to
determine how they rotate. They should turn freely. If
there is a spot where they turn hard, install a gasket
between the horizontal housing and gearbox.
Gearbox Assembly - Input
Press cups into main housing until they seat against
machined shoulders. Press bearings onto shafts until
they seat against machined surface next to gear.
Install input shaft into gearbox housing, then press
bearing on with sleeve until all free play is removed
(similar to adjusting front wheel bearings on an auto-
mobile). Check by spinning housing. It should turn
freely.
If bearings are too tight, hold housing and rap gear
shaft with a lead hammer. Do not leave bearings
adjusted too tight. Proper adjustment is essential to
good bearing life.
Install input shaft seal.
Bearing adjustment on the input shaft is set with the
sleeve and maintained by tightening a large hex nut
against the sleeve, installing a dowel plug in the nut,
and tightening the set screw against the dowel. Prior to
installing the nut, clean the threads on the nut and the
shaft and apply two drops of Loctite on the threads.
Output Shaft Installation
Place the square O-ring on the housing and install to
gearbox, tightening the four bolts evenly. Turn the
gears against each other to determine how they rotate.
They should turn freely without bearing end play. If
there is a spot where they turn hard, install a gasket
between housing and gearbox. If there is bearing end
play, remove gasket.
Install seals on both ends of shaft.
CROSSBAR
Removal
For crossbar removal, it is necessary to gain access to
bottom side of cutter. Raise cutter and securely block
up. You may use either puller screw (6) or a small
hydraulic jack to remove crossbar. See Figure 6.
Loosen bolts on crossbar clamp. Remove bolt retaining
washer by prying washer up and breaking weld.
Remove washer and bolt. Remove blades from cross-
bar (see page 18). Assemble clevises (1) to each end
of crossbar, utilizing blade pins, spacers, keyhole
plates and blade pin clips.
Position tube assembly (5) with threaded nut toward
crossbar. Install pad assembly (4) in nut on square tube
assembly.
Bolt square tube assembly to the clevises using 5/8" x
4-1/2" bolts (2). Insert puller screw assembly (6) into
square tube assembly (5) and tighten against pad
assembly (4) an gear shaft as shown. For best results,
strike head of puller screw with a sledge hammer while
tightening screw with a wrench. If crossbar has been
installed with Loctite, it may be necessary to apply heat
(greater than 500°F) to crossbar to break Loctite bond.
