Belt Tensions
Engine Compressor Belts and Pulleys
Correct pulley alignment and proper belt tension are very important when
installing a compressor. The compressor clutch must line exactly with the
engine pulley and other auxiliary idler or belt adjustment components. When
installing the clutch, make sure that the shaft drive key is in place and
properly tightened. Check the pulley alignment; make sure that the grooves
align properly. Double check by making sure the belt runs from pulley to
pulley in perfect alignment and no indication of a sideward bend.
Please see appendix # 2 for the appropriate compressor mount kit install
manual. At the top of each manual front page is a description of the engine
this kit was designed for, carefully select the engine you are working with.
Inside each manual there are step by step photo illustrated instructions for
install of the compressor mount kit. Of particular importance to the technician
is proper alignment of the six groove belts on eight groove pulleys.
Single V-Belt – Cat C7 A3RE/FE
Adjust the belt tension to 120 lbs. Check belt tension again after 36 hrs. of
running, the belt will stretch slightly in first few hours of operation. The belt
should not stretch any more after its initial seating period. Loose belts could
cause problems with compressor clutch operation and the life of the belt.
Poly V-Belt - Some A3RE/FE, All BBCV and All MicroBird
As with the conventional V Belt drives, correct pulley alignment and proper
belt tension are very important. Some buses configurations utilizes a Poly V-
Belt drive with automatic tensioner. With the automatic tensioner no
adjustment is required as the tensioner will maintain proper tension on the
belt at all times. Please refer to the engine specific compressor mount
manual for positioning of poly v-belts.
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