7. measure belt tension. Proper tension is achieved when a three
(3) pound weight or equivalent finger pressure applied midway
between the motor pulley and compressor flywheel causes a
1/4" (6.35 mm) deflection of the belt. If adjustment is needed see
Adjusting Belt tension under Maintenance.
8. Replace belt guard.
Adjusting Belt tension
WARNING: Hot surfaces. Risk of burn. Aftercooler, pump head, and
surrounding parts are very hot, do not touch (see the Hot Surfaces
identified in Fig. 2). Allow compressor to cool prior to servicing.
1. Follow procedures 1-6 in Checking Belt tension under
Maintenance.
. Scribe a mark at the base of the pump on the deck to be used
as a reference.
3. Loosen four pump mounting nuts.
4. Remove the belt.
5. Scribe a mark approximately 1/8" (3. mm) from the original
mark.
6. Slide the pump to the new mark and retighten the pump mount-
ing nuts.
WARNING: Risk of moving parts. Use caution when rolling
belt onto flywheel, fingers can get caught between the belt and
flywheel.
7. With the pump secure, roll the belt over the flywheel and the
pulley.
8. Check the belt tension again. See Step 7 in Checking Belt
tension under Maintenance.
9. When tension is correct, torque four pump mounting nuts (Torque
to 6–8 ft.- lbs./8.1–10.8 Nm) and replace belt cover.
Pulley and Flywheel Alignment
The air compressor flywheel and motor pulley must be in-line (in the
same plane) within 1/16" (1.6 mm) to ensure belt retention within
flywheel belt grooves. To check alignment:
1. Ensure On/Off switch is in the OFF position.
. Allow the unit to cool.
3. Remove air compressor plug from outlet.
4. Drain air tank.
5. Remove outer belt cover.
6. Place a straightedge (U)
against the outside of
the flywheel (R) and the
motor drive pulley (S).
7. measure the distance
between the edge of
the belt (T) and the
straightedge at points A1 and A in Figure. The difference
between measurements should be no more than 1/16" (1.6
mm).
8. If the difference is greater than 1/16" (1.6 mm), loosen the
setscrew holding the motor drive pulley to the shaft and adjust
the pulley's position on the shaft until the A1 and A measure-
ments are within 1/16" (1.6 mm) of each other.
9. Tighten the motor drive pulley setscrew. Torque to 145–165 in.-lbs.
(16.4– 18.6 Nm).
10. Visually inspect the motor drive pulley to verify that it is perpendicular
to the drive motor shaft. Points B1 and B of Figure should appear
to be equal. If they are not, loosen the setscrew of the engine drive
pulley and equalize B1 and B, using care not to disturb the belt
alignment performed in Step 8.
17
A1
A
B1
R
T
S
U
A1
A B1
B
B