Dewalt DXCMH1393075 Instruction Manual - Page 21

Belt Replacement, Adjusting Belt Tension, Pulley and Flywheel Alignment

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English 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 V 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. Downward Force 4. Drain air tank. 5. Slide engine into Deflection 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 pulley and the flywheel when a 10 pound (4.6 kg.) weight is applied at the midway point. 8. When proper belt tension is achieved, tighten all four engine mounting screws. Torque to 15-22 ft-lbs (20.3-29.8 Nm). 9. Reconnect spark plug wire. Pulley and Fly­wheel 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 following steps: 21

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21
English
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
V
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.
Downward Force
Deflection
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
pulley and the flywheel when a 10 pound (4.6  kg.) weight is
applied at the midway point.
8. When
proper
belt
tension
is
achieved,
tighten
all
four engine mounting screws. Torque to 15-22 ft-lbs
(20.3–29.8 Nm).
9. Reconnect spark plug wire.
Pulley and Flywheel 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: