Dewalt DXCMH1608WB Instruction Manual - Page 18

Adjusting Belt Tension, Pulley and Flywheel Alignment

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English 7. Remove outer belt cover. 8. Measure belt tension. Proper tension is achieved when a three (3) pound (1.36 kg) 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. 9. Replace belt guard. 10. 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. Follow procedures 1-8 in Checking Belt Tension under Maintenance. 2. Scribe a mark at the base of the engine on the deck to be used as a reference. 3. Loosen but do not remove four engine mounting nuts. 4. Loosen but do not remove bolt securing stiffener bracket to engine. 5. Remove the belt. 6. Scribe a mark approximately 1/8" (3.2 mm) from the original mark. 7. Slide the engine to the new mark and retighten the engine mounting nuts. Warning: Risk of moving parts. Use caution when rolling belt onto flywheel, fingers can get caught between the belt and flywheel. 8. With the engine secure, roll the belt over the flywheel and the pulley. 9. Check the belt tension again. See Step 8 in Checking Belt Tension under Maintenance. 10. When tension is correct, torque four engine mounting nuts (engine torque to 10- 20 ft.‑lbs./13.5-27.1 Nm), stiffener bracket bolt (Torque to 10-20 ft.- lbs./13.5-27.1 Nm), and replace belt cover. 11. Reconnect spark plug wire. Pulley and Fly­wheel 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 (T) against the outside of U the flywheel (U) and the A1 W A2 B1 B2 V engine drive pulley (V). 7. Measure the distance between the edge of the belt (W) and the A1 T A2 B1 B2 straightedge at points A1 and A2 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 engine drive pulley to the shaft and adjust the pulley's position on the shaft until the A1 and A2 mea­sure­ ments are within 1/16" (1.6 mm) of each other. 9. Tighten the engine drive pulley setscrew. Torque to 145-180 in.- 18

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18
English
7. Remove outer belt cover.
8. Measure belt tension. Proper tension is achieved when a
three (3) pound (1.36 kg) 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
.
9. Replace belt guard.
10. 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. Follow procedures 1-8 in
Checking Belt Tension
under
Maintenance.
2. Scribe a mark at the base of the engine on the deck to be used
as a reference.
3. Loosen but do not remove four engine mounting nuts.
4. Loosen but do not remove bolt securing stiffener bracket to
engine.
5. Remove the belt.
6. Scribe a mark approximately 1/8" (3.2 mm) from the original
mark.
7. Slide the engine to the new mark and retighten the engine
mounting nuts.
WARNING
: Risk of moving parts. Use caution when rolling belt
onto flywheel, fingers can get caught between the belt and flywheel.
8. With the engine secure, roll the belt over the flywheel and the
pulley.
9. Check the belt tension again. See Step 8 in
Checking Belt
Tension
under
Maintenance
.
10. When tension is correct, torque four engine mounting nuts
(engine torque to 10– 20 ft.-lbs./13.5–27.1 Nm), stiffener bracket
bolt (Torque to 10–20 ft.- lbs./13.5–27.1 Nm), and replace belt
cover.
11. Reconnect spark plug wire.
Pulley and Flywheel 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 (T)
V
T
U
A1
A1
A2
A2
B1
B2
B1
B2
W
against the outside of
the flywheel (U) and the
engine drive pulley (V).
7. Measure the distance
between the edge of
the belt (W) and the
straightedge at points A1 and A2 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 engine drive pulley to the shaft and adjust
the pulley's position on the shaft until the A1 and A2 measure-
ments are within 1/16" (1.6 mm) of each other.
9. Tighten the engine drive pulley setscrew. Torque to 145–180 in.-