FORM 100.10-NOM2
45
YORK INTERNATIONAL
BELTS
Belts should be checked again after 24 hours of opera-
tion. On multiple belt adjustable pulleys, the pitch depth
should be checked to insure identical belt travel, power
transfer and wear. Adjustable motor bases are provided
for belt adjustment.
Motor pulleys (both adjustable pitch
and fixed pitch, and blower shaft pul-
leys) are locked in position with ei-
ther set screws or split taper lock bush-
ings. All set screws and/or taper lock
bolts must be checked for tightness
and alignment before putting equip-
ment into operation.
An incorrectly aligned and tensioned
belt can substantially shorten belt life
or overload blower and motor bearings,
shortening their life expectancy. A belt
tensioned too tightly can overload the
motor electrical causing nuisance trip-
ping of the motor overloads and/or mo-
tor failure and/or shaft failure.
BELT REPLACEMENT
Always replace belts as a set.
Follow the steps below to replace belts:
1. Release the tension on the belts by loosening the
adjusting nuts on the fan motor.
2. Remove old belts and recheck the sheave align-
ment with a straight edge.
3. Install the new belts on the sheaves.
Never place the belts on the sheaves
by using a screwdriver to pry the belt
over the rim of the sheave. This will
damage the belts permanently.
BELT TENSIONING
Beginning in 1995, important data such as the “Correct
Belt Tensioning Data” for each specific unit is shown
on the Information Label shown in Figure 43.
Use the belt tension gauge shown in Figure 44 to prop-
erly tension belts. Use belt tension data from the label
on the unit fan.
Squealing belts during starting is
caused by slipping belts that are not
tensioned properly.
FIG. 43 –
TYPICAL DRIVE KIT DATA TAG
FIG. 44 –
BELT TENSIONING GAUGE
LD06354
00494VIP
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