Dewalt DXCMLA3706056 Instruction Manual - Page 19
Adjusting Belt Tension, Motor Pulley, Flywheel Alignment
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English 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. Set the Auto/Off lever to N "Off", shut off the main power disconnect, and relieve all air pressure from the air tank. 2. Remove the belt guard by removing the 7 screws (N) using a Phillips head screwdriver. 3. Mark pump position on saddle. 4. Loosen the motor mounting screws and slide the motor toward the air compressor. 5. Remove the belt and replace with a new one. 6. See the Adjusting Belt Tension before tightening motor mounting screws. Adjusting Belt Tension 1. Slide motor into original position, line the motor up with the mark made earlier on saddle. 2. Tighten two outside motor mounting screws enough to hold the motor in place for checking pulley and flywheel alignment. 3. 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. 3. When proper belt tension is achieved, tighten all four motor mounting screws. Torque to 20-25 ft-lbs (27.1-33.9 Nm). 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. Verify the alignment by performing the following Motor Pulley/ Flywheel - Alignment. Downward Force Deflection Motor Pulley/ Flywheel Alignment NOTE: Once the motor 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 motor 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: 1. Set the Auto/Off lever to "Off", shut off the main power disconnect, and relieve all air pressure from the air tank. 2. Remove belt guard. 3. Place a straightedge against the outside of the flywheel and the motor drive pulley. 4. Measure the distance between the edge of the belt and the straightedge at points A1 and A2 in figure. 19
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