
Ê
Testing Belt Tension
NOTE: Use the “Initial Tension” column (Table below) when
adjusting belts that have never been used. Use the “Final Ten-
sion” column when adjusting belts that have been used.
Check belt tension when replacing and adjusting drive train
components. Belt tension testing tool (Milnor
®
part number
30T001), straight edge, and Belt Tension Tables are required when
setting belt tensions. Do not refer to instruction sheet provided
with tension testing tool. Check tensions for new belts according to
the following schedule:
•
After 24 hours of operation (three eight-hour days)
•
After 80 hours of operation (ten eight-hour days)
•
After 160 hours of operation (twenty eight-hour days)
1. Move upper O-ring on the tension testing tool to the uppermost position (resting against the bottom edge of
sliding cap).
2. Determine deflection for the main drive belt (see FIGURE 5 for the belt location and Table for the setting
range). Move lower O-ring to the correct setting (inches or centimeters) on scale. Read the bottom edge of
the O-ring.
3. Place a straight edge along the top edge (pulley to pulley) of the belt. Depress the tension testing tool by slid-
ing the cap against the middle of the belt span until the bottom edge of the lower O-ring aligns with the
straight edge as shown in FIGURE 6.
4. Read the top edge of the upper O-ring position and determine if it is within the specified range. If the readings
are below the specified range, tighten the belt. If the readings are above the specified range, loosen the belt.
Adjust the belt and repeat steps one through four until tension is within the specified range.
Ê
Replacing Belts
Remove motor drive belt by loosening the threaded jacking rods that determine the belt tension for the pulley.
Do not force belts off by prying and turning pulley. Check belt tension and pulley alignment after replacing the
belts.
Ï
Table — Main Drive Belt Tension Specifications
Model
Cycle
Belt Deflection
(centimeters)
Initial Tension
pounds
(kilograms)
Final Tension
pounds
(kilograms)
30022H7J
30022H8J
All
24/64
(0.95)
6.7—9.8
(3.0—4.4)
5.2—7.6
(2.4—3.4)
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 un-
til 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)
Î
FIGURE 6
(MSSM0712AE)
Î
Setting Belt Tension
Î
FIGURE 7
(MSSM0712AE)
Î
Aligning the Pulley
Содержание 30022H8J
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Страница 19: ...Understanding the Tag Guidelines for the Models Listed Below PELLERIN MILNOR CORPORATION End of BIUUUI02 ...
Страница 25: ...Section 1 Service and Maintenance ...
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Страница 53: ...Section 2 Drive Assemblies ...
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Страница 69: ...Section 4 Water and Steam Piping and Assemblies ...
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Страница 83: ...Section 6 Control and Sensing Devices ...