VOGT ICE TUBE-ICE P-24A, Service Manual

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7-8
P24A & P34A Service Manual
MAINTENANCE
12/17/2012
V-Belt Maintenance.
Belts should be kept clean, free of oil and protected from sunlight as much as
possible. To clean belts, they should be wiped with a dry cloth. The safest way to remove dirt and
grime is to wash the belt with soap and water and rinse well.
BELT DRESSING SHOULD
NEVER BE USED ON A V-BELT DRIVE.
The tension on a 5 rib, banded V-belt can be checked as follows:
1. Apply 50-75 pounds of deflection force uniformly across the belt, midway between the pulley
centers. Lay a straight edge across the sheaves to measure the deflection. The deflection should
be 5/8” to 3/4”.
2. When installing a new belt, move the sheaves together to allow the belt to slide across the
sheaves. Rotate the belt and sheaves to obtain proper seating. Remove the slack from the belt
and measure the outside circumference to the nearest 1/4”. Multiply this reading by .0075 and
.001, add these amounts to the circumference reading. Elongate the belt to the new length.
Example: 105 x .0075 = .7875, 105+ .7875 = 105.7875=105 3/4” min.
105 x .001 = 1.05, 105+ 1.05 = 106.05=106 1/16” max.
3. Check compressor sheave and motor sheave with a straight edge to be sure they are parallel and in
the same plane.
4. The tension should be checked after 24 to 48 hours of operation to compensate for initial stretch
and wear-in. Periodic checks should be made and tension restored as necessary.
General Rules:
1. The best tension for a V-belt drive is the lowest tension at which the belt will not slip under the
highest load. Too much tension shortens belt and bearing life.
2. Check tension often during the first 48 hours of operation and periodically afterwards.
3. Keep belts and sheaves free of any foreign material which may cause slippage.
4. If a belt slips, tighten it.