Mounting instruction 17 November 2010

007986 (replaces 0179-024)

Alignment of shafts prior to coupling installation

This instruction applies to compressor units with tunnel mounted motors i.e. SAB 193, SAB 233 and SAB 283.

To secure trouble free operation the motor and compressor shafts must be properly aligned prior to installing the

coupling. This document describes the procedure used in the assembly line to measure misalignment but is also

applicable for on-site measurement.

To measure the radial misalignment a dial indicator is used. The dial indicator is fastened to a rigid arm bolted firmly

to the end of the motor shaft so that the tip of the indicator touches the compressor shaft. The setup is shown in the

Maximum misalignment: 0.38 mm

Note: This is the method used in the assembly line to measure the misalignment, other methods can be used, but

careful as reading via a mirror is a possible source of error.

reading is less than 0.38 mm.

Repeat the measuring procedure and the alignment procedure until the misalignment is less than 0.38 mm.

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Product Development

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Johnson Controls Denmark ApS