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COUPLING MAINTENANCE:
Coupling alignment should be checked seasonally or every 500 hours.
1. Remove coupling guard.
2. Check parallel alignment by placing a straight-edge across the two coupling flanges and
measuring the maximum offset at various points around the periphery of the coupling
without rotating the coupling. If the maximum offset exceeds 0.025 in., re-align the shafts.
3. Check angular alignment with a
micrometer or caliper. Measure from
the outside of one flange to the outside
of the other at intervals around the
periphery of the coupling. Determine
the maximum and minimum dimensions
without rotating the coupling. The
difference between the maximum and
minimum must not exceed 0.109 in.
If a correction is necessary, be sure to
recheck the parallel alignment.
4. Reinstall coupling guard.
Note: PTO shaft height is adjusted by loosening the bolts that attach the engine mounting feet
to the engine block, adjusting the engine position and re-tightening the bolts. The PTO
shaft lateral position is adjusted by loosening the 6 bolts that attach the engine mount
adapter plate to the machine frame, adjusting the engine position and re-tightening the
bolts. It is not recommended that the four engine isolator mounts be loosened to perform
coupling alignment. The compliance of the rubber mounts makes this difficult.
Parallel Angular
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