Adjusting Belt Tension; Pulley And Fly Wheel Alignment - DeWalt D55684 Instruction Manual

6. Remove outer belt cover.
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.
9. Reconnect spark plug wire.

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. Ensure engine ON/OFF switch (C) is in the OFF position.
2. Allow the unit to cool.
3. Disconnect spark plug wire.
4. Drain air tank
5. Loosen but do not remove four pump mounting bolts.
6. Remove eight belt cover screws.
7. Remove outer belt cover.
8. Loosen but do not remove pump stiffener
bracket bolt (X).
9. Turn belt tensioning
clockwise to increase belt tension or
counterclockwise to loosen belt tension.
10. Check the belt tension again. See Step
7 in Checking Belt Tension under
Maintenance.
X
(N) bolt
11. When tension is correct, retighten four
pump mounting bolts
18– 22 ft.- lbs./24.4–29.8 Nm), stiffener
bracket bolt (torque to 18– 22 ft.- lbs./
24.4– 29.8 Nm), and replace belt cover.
12. Reconnect spark plug wire.
Pulley and Fly wheel
Alignment
The air compressor flywheel and engine 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 engine ON/OFF switch (C) is in the OFF Position.
2. Allow the unit to cool.
3. Disconnect spark plug wire.
4. Drain air tank.
5. Remove outer belt cover.
6. Place a straightedge
(Y) against the outside
of the flywheel (Z) and
the engine drive pulley
(A1).
7. Measure the distance
between the edge of
the belt (A2) and the straightedge at points A3 and A4 in Figure.
The difference between mea sure ments 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 engine drive pulley to the shaft and adjust
the pulley's position on the shaft until the A3 and A4 mea sure-
ments are within 1/16" (1.6 mm) of each other.
19
(torque to N
A3 A4 A5 A6
Z
A2
A1
Y
A3 A4 A5 A6