Twin Disc MG-5170DC, Service Manual

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140
Twin Disc, Incorporated
Assembly
Marine Transmission Service Manual #1020667
Primary and Secondary Shaft Bearing Adjustment
Note: Procedure for setting and checking endplay for primary
and secondary shafts is the same. Procedure described
and illustrated is for the secondary shaft. Repeat same
procedure for the primary shaft.
1. With a felt-tip pen, make a mark across the rear end of the secondary
shaft.
2. Install a dial indicator on a machined surface on the manifold with the
probe resting on the mark made on the secondary shaft.
Figure 103. Checking Secondary Shaft Bearing Adjustment
3. Install an eyebolt into the end of the shaft and exert 890 N (200 lbs)
downward force while rotating the shaft several revolutions in each
direction. Stop so that the dial indicator probe is resting on the mark.
4. Zero the dial indicator.
5. Remove downward pressure and exert 1334 N to 1557 N (300 lbs to
350 lbs) lifting force on the shaft. Rotate the shaft several revolutions in
each direction stopping with the dial indicator probe resting on the mark.
6. Dial indicator reading is secondary shaft endplay. Endplay should be
between 0.05 mm to 0.15 mm (0.002 in. to 0.006 in.). Add or remove
shims as necessary to achieve correct endplay. Use dial indicator and
above procedure to confirm that desired endplay has been attained.