H&S 2280 Operator's Manual page 21

MAIN APRON CHAIN
Adjust the apron by tightening the adjusting bolts located at
the front of the spreader until the apron chain rests lightly on
top of the chain guides located bellow the axle.
NOTE: Tighten the adjusting bolts on each front corner
equally on each side so that the apron slats run parallel
with the ends of the bed. The apron will be damaged if the
machine is operated with one end of the apron slats running
ahead of the opposite end. Do not tighten the apron chains
excessively.
APRON DRIVE CHAIN
Maintain proper tension on the apron drive chain. There should be
a 1/4" deflection at the side of the chain when properly adjusted.
To adjust, loosen the bolt holding the tightener. Slide the tightener
against the drive chain and retighten the bolt. Failure to maintain
proper tension will result in excessive wear to the chain and sprocket.
WHEEL HUBS
To adjust wheel hubs, tighten the castellated nut on the
spindle to the point where there is no end-play and a
slight drag on the bearings. Replace the cotter key with
a new one of the correct size.
ADJUSTMENTS
-19-
Shields
Removed
for
Clarity
Tightener Bolt & Bracket
Tightener Bolt