Central Pneumatic 68140 Set Up And Operating Instructions Manual page 18

BELT ALIGNMENT & ADJUSTMENT
See Figures 7 - 8 - 9 - 10.
Drive belts tend to stretch with normal use and require
adjustment periodically (check monthly). In order to adjust
the drive belt, the belt guard must be removed.
In order to remove the belt guard, follow the instructions
shown in figures 7 - 8.
Check the belt alignment by placing a straightedge against
the face of the flywheel, touching its rim at two places
(refer to Fig. 9). Adjust the flywheel or motor pulley so that
the belt runs parallel to the straightedge. Use a puller to
move the motor pulley on the shaft.
Properly adjusted, a 3 pound pressure applied to the belt
between the motor pulley and the compressor flywheel will
deflect the belt about 1/4" (6mm). Refer to Fig. 10.
To adjust the belt tension, perform the following
operations:
Loosen the four engine mounting screws.
Slide the engine in the proper direction, until the belt is
tensioned to the point where it can still be depressed by
approx. 1/4" (6mm) at the longest free position.
Re-tighten the engine mounting screws and refit the
safety guard for the belt.
MAINTENANCE
Edge of straightedge should touch outer rim of flywheel
at two places; belt should run parallel to straightedge
ENGINE
UNIT
18
SAFETY GUARD
FOR THE BELT
SAFETY GUARD
FOR THE BELT
TOP VIEW OF COMPRESSOR UNIT
BELT
ENGINE MOUNTING
SCREW
Fig. 7
Fig. 8
Fig. 9
1/4 in.
(6 mm)
Fig. 10