M
AINTENANCE
Fan Wheel/Fan Shaft —————
Should it become necessary to remove the blower fan shaft from the engine flywheel, it is very important
that the shaft be removed and re-installed using the following procedure, to ensure that the shaft runs straight and
does not vibrate.
Removal:
1. After removing fan wheel from shaft assembly, install (2) 1/2” SAE bolts in the holes provided in the drive
plate, to assist in removal.
2. Remove the (8) mounting bolts from the drive plate. CAUTION! Some machines may have shims on the
mounting bolts, between the drive plate and flywheel. It is important that the shim(s) be kept on the
same bolts, and that they are re-installed in the same holes from which they were removed. It is
recommended to number each bolt, and corresponding mounting hole, to ensure proper re-assembly.
3. Turn 1/2” bolts inward on the drive plate to loosen shaft assembly from flywheel.
Installation:
1. Clean the mating surfaces of the flywheel and the shaft assembly thoroughly.
2. Apply “Loctite 242” thread locker to the (8)-3/8”x 1-1/4” mounting bolts.
3. Using (4) 3/8” x 1” countersunk flathead bolts (@ 90 degrees apart) and (4) 3/8” x 1-1/4” bolts, loosely re-
install the shaft assembly with witness marks lined up, and shims (if used) installed on proper bolts. Tighten
countersunk bolts evenly, to center the shaft on bolt holes.
4. Tighten the (4) 3/8” x 1-1/4” bolts to 30 ft. Lbs.
5. Remove the (4) flathead countersunk bolts, and replace with the remaining 3/8”x 1-1/4” bolts, and torque to
30 ft. lbs.
6. Using a dial indicator, check run-out of shaft between keyway and shoulder area on shaft. Run-out should
not exceed 0.010”.
IMPORTANT: In order to maintain a balanced fan wheel; never replace individual blades on the
wheel. Always replace as a complete set, and re-balance complete fan assembly, prior
to re-installing on fan shaft.
Witness Marks
(Locate before removal to
insure proper reassembly)
Removal Bolt Holes
Flywheel
Fan Shaft Drive Plate
113
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