Belt Replacement; Adjusting Belt Tension; Pulley And Fly Wheel Alignment - DeWalt DXCMH1393075 Instruction Manual

Belt Replacement

WARNING: To avoid personal injury, always shut off the
gasoline engine and relieve all air pressure from the system
before performing any service on the air compressor. Do not
use the unit with the shrouds or belt guard removed. Serious
injury could occur from contact with moving parts. Hot
surfaces. Risk of burn. 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 START/RUN/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 the front of the
beltguard by removing
the screws and wash-
ers (V) using a Torx T25
bit.
6. Mark pump position on
saddle.
7. Loosen the engine
mounting screws and
slide the engine toward
the air compressor.
8. Remove the belt and replace with a new one.
9. See the Adjusting Belt Tension before tightening engine
mounting screws.
10. Reconnect spark plug wire.

Adjusting Belt Tension

1. Ensure engine START/RUN/OFF switch (C) is in the OFF
position.
2. Allow the unit to cool.
3. Disconnect spark plug
wire.
4. Drain air tank.
5. Slide engine into
original position, line
the engine up with the
mark made earlier on
saddle.
6. Tighten two outside
engine mounting screws enough to hold the engine in place for
checking pulley and flywheel alignment.
7. The belt should deflect 1/2" (13 mm)at midway between the
V
pulley and the flywheel when a 10 pound (4.6 kg.) weight is
applied at the midway point.
8. When proper belt
four engine mounting screws. Torque to 15-22 ft-lbs
(20.3–29.8 Nm).
9. Reconnect spark plug wire.

Pulley and Fly wheel Alignment

NOTE: Once the engine 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 engine pulley must be in-line
(in the same plane) within 1/16" (1.6 mm) to assure belt retention
within flywheel belt grooves. To check alignment, perform the fol-
lowing steps:
21
Deflection
tension is achieved, tighten all