MSSM0709BE/9273BV
ÈJACKSHAFT BEARING REPLACEMENT
ÊRemoving the Jackshaft
ELECTROCUTION HAZARD—High voltage is present inside electric boxes, mo-
tors, and many other components. Power switches on machine control panels
disable only control circuit power in certain boxes. You can be killed or seri-
ously injured on contact with high voltage.
☞ Lock OFF and tag out power at the wall disconnect before servicing.
Dual motor drive 30015, 30020, and 30022 machines are equipped with jackshafts. Replace worn bearings
as described below.
See “JACKSHAFT ASSEMBLY” (see Table of Contents) during the following procedures:
1. With the power locked OFF, remove the top console cover by prying out the four plugs and unscrewing the
four bolts. Remove the rear belt guard.
2. Loosen and remove the belts from the jackshaft. Remove the straight bore pulley, electric clutch and coil from
the jackshaft (for further information see “DRIVE TRAIN SERVICE” in the Table of Contents).
3. Remove the four jackshaft mounting screws.
ÊReplacing the Bearing
NOTE: Provide enough clearance around the bottom of the hous-
ing (FIGURE 1) as the bearing will come out with the shaft.
1. Remove and discard the shaft clip and place the assembly in a
press with the tapered shaft end pointing up as shown in FIGURE
1. Press the shaft down. When the lower bearing clears the hous-
ing, the shaft will drop out with the lower bearing remaining on
the shaft.
2. Place the shaft in the press and remove the bearing from the shaft.
Remove the outer retaining ring from the housing and discard.
Place the housing in the press with the bearing facing downward,
then press the bearing out. Remove the inner retaining ring and
discard all retaining rings.
3. Thoroughly clean all parts with solvent. The bearing housing
and shaft must be absolutely clean and free of dirt and ad-
hesives.
4. Install a new inner retaining ring inside the housing and apply a
small amount of retaining compound (Loctite 271 or similar)
around the bearing seating surface of the bearing housing as
shown in FIGURE 2. Press the new bearing in the housing, ap-
plying equal force to the inner and outer bearing races. Install a
new outer retaining ring in the housing.
5. Slide the other new bearing onto the shaft and place the shaft in-
side the housing with the tapered end into the installed bearing.
Place the assembly under the press with the housing completely
supported by the inner and outer race of the bearing as shown
in FIGURE 2. Simultaneously press the bearing onto the shaft
and into the housing until the bearing bottoms out, applying
equal force to both inner and outer bearing races. Install a new
shaft clip (tapered end only).
ÊInstalling the Jackshaft
1. Replace the jackshaft and all related components in reverse order
of disassembly.
2. Align pulleys and set belt tension as explained in “DRIVE TRAIN SERVICE”.
ÎFIGURE 1
(MSSM0709BE)
ÎRemoving Jackshaft
Bearings
ÎFIGURE 2
(MSSM0709BE)
ÎReplacing Jackshaft
Bearings
B
To Next Page
Loading...
Need help?
General
