Milnor 30022H7 Series, Service, Page: 17 / 76

Ê Removing and Installing the Main Drive Pulley
Replace the pulleys if the side walls are chipped, broken, or excessively worn. Remove the console top and
belt guards, then remove the appropriate belts, dirt, or paint from the shaft end and see instructions below.
Ë Taper Lock Bushing Pulleys
DO NOT use lubricants, “Loctite” or other compounds on taper lock bushings, pulleys,
or shafts.
1. Loosen and remove all three bushing bolts. Thread two bolts into the push-off holes in the bushing
(FIGURE 7) and alternately tighten them until the bushing and pulley separate and can be removed from
the shaft.
2. Remove the burrs from the shaft, then clean and polish shaft. Clean tapered surfaces of bushing and inside
bore of pulley. Determine that inside bore of bushing is clean and clear.
3. Place the key in shaft. Check for a proper fit. Key
must fit snugly; if not, replace the key or bushing.
4. Insert the bushing loosely into the pulley and start all
three bolts. Install the pulley on the shaft and ap-
proximately align it with the corresponding pulley.
5. Gradually tighten the bolts in an alternating pattern
until the bushing is seated within the pulley. Rotate
the pulley and check for wobble or runout.
6. Install the belts, adjust out all slack, and align the pul-
leys (see “Aligning Pulley” in this section).
7. Tighten the bushing bolts and the set screw to the
“Recommended Bushing Torques” in Table below,
and adjust the belt tension according to “Testing
Belt Tension” in this section.
Ï Recommended Bushing Torques
Size Code
(Stamped on bushing)
Fasteners Bushing Bolt Torque
inch pounds
(kilogram/meters)
Set Screw Torque
inch pounds
(kilogram/meters)
SK 5/16"– 20 bushing bolt 180 (2) —
1/4"– 20 set screw — 87 (1)
Ë Aligning Pulley
After replacing the drive train components, check the pulley alignment.
1. Stretch a string from the motor pulley to the drive pulley as shown on FIGURE 8.
2. Adjust the position of the main drive pulley until the string touches A, B, C, and D. Secure the pulley.
ENTANGLE HAZARD—Belts and pulleys can crush and entangle body parts.
☞
Insure belt and pulley guards are in place before operating machine.
Ë Testing Belt Alignment
—After aligning the belts, observe
the belts with the machine operating. If an adjustment is neces-
sary, lock OFF and tag out power before proceeding.
Ë About Belts
—All V-belts are not alike. So called “Super” or
“High Capacity” belts frequently have considerably higher capaci-
ties than “Standard” belts. Sometimes a particular manufacturer’s
V-belt will be more suitable for a certain application, and another
manufacturer’s V-belt may be suitable for a different application.
This may occur in spite of the fact that both manufacturers belts are
reputably “interchangeable”. Because of this, it is always best to
purchase replacement belts from the original manufacturer of the
equipment. If you do not wish to do this, we suggest that when you
replace the belt, you purchase the exact style and type belts with
which the machine was originally equipped. This is the best way to
achieve belt life on your replacement belts equal to the life of the
original set. If you are not satisfied with the life of the original set,
you should ask our factory if a better belt has been developed for the
specific application.
Î FIGURE 7
(MSSM0712AE)
Î Aligning the Pulley
Î FIGURE 8
(MSSM0712AE)
Î Aligning Pulley