TM 9-2320-260-20
13-13. BOLSTER MIDWINCH DRIVECHAIN AND SPROCKETS MAINTENANCE (Contd)
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d. Sprockets Installation
1. Install midwinch sprocket (1) on midwinch shaft (4) with shearpin (2) and new two cotter pins (3).
2. Position new woodruff key (6) and propeller shaft sprocket (10) on propeller shaft (7). Install
setscrew (9).
3. Position sleeve bearing (11), new woodruff key (5), and collar (12) on propeller shaft (7). Install
lubrication fitting (13).
4. Install sleeve bearing (11) on support bracket (16) with two screws (14) and new locknuts (8).
Do not tighten lockhuts (8).
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e. Drivechain Installation
chain (15) ends will not meet, perform adjustment (task f).
2. Install master link (19) and cap (18) on drivechain (15) with two new cotter pins (17).
f. Drivechain Adjustment
1. Using a straight edge as a gage, measure 7/16-9/16-in. (1.1-1.4-cm) deflection at upper midpoint
of drivechain (15). If deflection is not correct, record measurement and adjust drivechain (15).
2. Slide sleeve bearing (11) right or left in slotted holes on support bracket (16) to tighten or loosen
drivechain ( 15).
3. Repeat steps 1 and 2.
4. Tighten locknuts (8) when proper deflection is obtained.
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