MAINTENANCE & SERVICE PAGE 35
FLYWHEEL COUPLINGS
DRIVE COUPLING ALIGNMENT
When aligning the coupling, it is important that the centerline
of the blower shaft be true to the centerline of the (driver)
engine shaft. Wear on these components due to the axial and
radial forces transmitted during operation will be avoided
with proper alignment.
COUPLING SHOULD BE ALIGNED WITHIN .015"
PARALLEL AND ANGULAR.
1
To check PARALLEL drive coupling alignment, set up
a dial indicator, with the base securely fixed at the
surface of the engine bell housing or on the flywheel
bolt ring (make sure that the bolt ring is properly
installed and bolts are torqued). Set the indicator on
the O.D. of the coupling hub and rotate the coupling to
determine any offset. Parallel alignment must be
limited to .015".
2
To check ANGULAR drive coupling alignment, set the dial indicator to read from the face of the coupling flange, and
again rotating the coupling to determine any offset. Angular alignment should be within .015". If correction is
required be sure to recheck the parallel alignment.
3
In the field, the angular measurements may be approximated with a tape or ruler. Use opposite reference positions on
the engine bell housing, measuring to respective locations on the perimeter of the coupling flange (blower side). The
variations should be limited to 1/32". However, this method should be rechecked as soon as possible as indicated
above.
ALIGNMENT OR REPLACEMENT
It should not be necessary to replace any parts on the drive coupling assembly, provided that misalignment is discovered at the
onset. The following procedure covers the process to replace an entire coupling assembly, and may also be used as a guide for
alignment also.
1
Inspect the coupling assembly for damaged parts. Secure replacements as required.
2
Remove any protective coatings or lubricants from bores, mating surfaces and fasteners. Remove any burrs, etc. from
the shafts.
3
Slide the coupling flange (hub) onto the blower shaft using the proper, snug fitting, key. Should the fit be loose,
identify the cause and remedy before proceeding further.
4
Slide the coupling plate, with the steel hub and blower shaft mounted to it, into the flywheel pilot or counter bore.
Install and tighten the flywheel mounting screws alternately to approximately 400 in. lb..
5
Shim the shaft bearing and/or engine as required, and tighten all bolts.
6
Check parallel and angular alignment as described above. Should the alignment be within specifications, proceed to
step 8.
7
Loosen shaft bearing, and/or engine bolts as required, adjust shims to correct the misalignment. Torque all fasteners,
then repeat step 6.
8
Using a thread locking resin, torque the set screws on the shaft flange securely. Check that all fasteners are securely
torqued.
9
Replace coupling guard and bearing end shaft guard.
MANUAL 33000900
© REINCO INC. 1998
REVISED 3/98
