44
IMT CAS2545 Air Compressor Manual Part No. 99904145
BELT SHEAVE/PULLEY ALIGNMENT AND CONDITION
Check Condition of Sheaves.
Before a new set of V-belts are installed, check the condition of the
sheaves. Dirty or rusty sheaves impair the drive efficiency and abrade the belts, which results in
premature failure. Worn sheaves shorten the belt life as much as 50 percent. If the grooves are
worn such that the belt bottoms out, slippage may result and burn the belts. If the sidewalls are
"dished out", the bottom shoulder ruins the belts prematurely by wearing off the bottom corners.
Check Sheave Alignment
. Sheave adjustment should be checked by placing a straight edge or
tight cord across the sheave face so it touches all four points of contact. A misalignment of more
than 1/2° (1/8") per 12" of distance will adversely affect belt life. Improper sheave alignment
produces uneven wear on one side of the belt, causes the belt to roll over in the sheaves, or
throws all of the load on one side of the belt, stretching or breaking the cords on that side.
1/4" GAP BETWEEN
BACK FACE OF PULLEY
AND MOTOR MOUNT FACE
STRAIGHT
EDGE
REF 99904148 REV A 20070220
Installing Belts on Sheaves.
Shorten the center distance of the drive until the belts can be put on
the sheaves without force. Forcing the belts can damage them.
Belt Selection.
For best service, replace V-belt drives with a complete new matched set of belts.
Never replace one of a set belts with a used belt, as used belts are worn in cross-section and
stretched. If a single belt fails, the entire set of belts should be replaced. A new belt will ride
higher in the sheave, will travel faster, and operate at a much higher tension than the used belts.
Mixing new and used belts can cause cord rupture in the new belts, which allows the new belts
to elongate. If the cord in a new belt ruptures, the new belt will fail to carry its full share of the
load, and the drive will be under-belted. Belts from different manufacturers should not be mixed,
either, for the same reasons.
Summary of Contents for CAS2545
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Page 15: ...Section 1 Compressor Introduction 13 CAS2545 Performance Charts...
Page 16: ...14 IMT CAS2545 Air Compressor Manual Part No 99904145...
Page 17: ...Section 1 Compressor Introduction 15...
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Page 71: ...Parts 69 Electrical Schematic 77441156...
Page 72: ...70 IMT CAS2545 Air Compressor Manual Part No 99904145 Hydraulic Schematic 99904155...
