Product Manual

Page 24 of 36
Adjusting Belt Tension
1. Slide the motor into its original position and line the motor up with the mark made earlier on the
saddle.
2. Tighten the two outside motor mounting screws enough to hold the motor in place for checking pulley
and flywheel alignment.
3. The belt should deflect 1/2” (13mm) at midway between the pulley and
the flywheel when a 5-pound (2.26 kg.) weight is applied at the midway
point.
4. When proper belt tension is achieved, tighten all four motor mounting
screws. Torque to 20-25 ft./lb. (27.1–33.9 Nm).
NOTE: Once the motor pulley has been moved from its factory set location,
the grooves of the flywheel and pulley must be aligned to within 1/16”
(1.6mm) to prevent excessive belt wear. Verify the alignment by performing the following alignment steps.
Motor Pulley/Flywheel Alignment
NOTE: Once the motor pulley has been moved from its factory set location, the grooves of the flywheel
and pulley must be aligned to within 1/16” (1.6 mm) to prevent excessive belt wear.
The air compressor flywheel and motor pulley must be in-line (in the same plane) within 1/16” (1.6 mm) to
assure belt retention within the flywheel belt grooves. To check alignment, perform the following steps:
1. Set the Auto/Off lever to OFF, unplug the unit, and relieve all air pressure from the air tank.
2. Remove the belt guard.
3. Place a straightedge against the outside of the flywheel and
the motor drive pulley.
4. Measure the distance between the edge of the belt and the
straightedge at points A1 and A2 in figure L. The difference
between measurements should be no more than 1/16”
(1.6 mm).
5. If the difference is greater than 1/16” (1.6 mm), loosen the set
screw holding the motor drive pulley to the shaft and adjust the pulley’s position on the shaft until the
A1 and A2 measurements are within 1/16” (1.6 mm) of each other.
6. Tighten the motor drive pulley set screw.
7. Visually inspect the motor drive pulley to verify that it is perpendicular to the drive motor shaft. Points
B1 and B2 of figure L should appear to be equal. If they are not equal, loosen the setscrew of the
motor drive pulley and equalize B1 and B2.
8. Retighten the motor drive pulley setscrew. Torque to 15-20 ft.-lb. (20.3-27.1 Nm).
9. Reinstall the belt guard.
Air Compressor Pump Intake and Exhaust Valves
Once a year, have a trained service technician inspect the air compressor pump intake and exhaust
valves.
Figure K
Figure L