40
TK 56430-18-IP-EN
Belt Alignment
Once the compressor mount kit and the compressor are installed, the pulley alignment must be checked to verify a full
life of the serpentine belt. Remove the serpentine belt, if already installed, and use a laser alignment tool to verify the
compressor pulley is in alignment. If the mount kit uses an add-on crank shaft pulley (additional pulley used to drive
only the Thermo King compressor,) only the alignment between the compressor and the additional pulley needs to be
verified. If the mount kit uses the existing crankshaft pulley and has the Thermo King compressor pulley share the same
belt as the OEM vehicle components (such as the alternator, power steering, etc.), the compressor pulley alignment
needs to be checked with the components before and after the compressor following the belt path.
There are several manufacturers of alignment tools, but the easiest to use and permanently calibrated is the Dayco
laser belt alignment tool (Dayco Part Number 93874). Such tools are readily available from auto parts stores online.
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Figure 28. Dayco Belt Alignment Tool
When checking the pulley alignment, both the angular and axial alignments need to be checked. An aaxxiiaall misalignment
will result in the laser being parallel but offset to the alignment slot on the target component (Figure 29, p. 40). In the
case where the axial alignment is off, spacers/shims can be added between the bracket and compressor to correct the
misalignment. Special attention should be given to which groove the alignment tool is used on. Most vehicles use six
groove pulleys and belts and the TK compressor come with an eight groove pulley to allow for more flexibility in axial
alignments.
Figure 29. Axial Misalignment
An aanngguullaarr misalignment will result in the laser not parallel to the alignment slot on the target component (Figure 30,
p. 41). When checking the angular alignment, rotate the pulley with the target component 1/8 of a turn in each direction
to check for angular misalignment in all planes. If there is angular misalignment, verify that the compressor clutch is not
bent or improperly assembled. If no problems are found with the compressor, contact the bracket manufacturer.
SSeeccttiioonn 55 -- CCoommpprreessssoorr SSeelleeccttiioonn aanndd IInnssttaallllaattiioonn SSttaannddaarrddss
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