Code possible cause

13Loose belt

14Engine mounting­ bolts are loose

15Pump stiffener bracket bolt is loose

16Loose pulley

17Loose flywheel

18Carbon build-up in pump

19Belt to tight

20Pulley misalignment

21Air tank pressure is too high

POSSIBLE SOLUTION

Check belt tension, see Adjusting Belt Tension under Maintenance.

Tighten mounting screws. Torque engine mounting bolts to 15– 22 ftlbs (20-30 Nm).

Warning: Risk of bursting. Excessive vibration could weaken the air tank and cause it to rupture or explode. Mounting screws must be kept tightened.

Check bolt and tighten if required. Torque pump stiffener bracket bolt to 15– 22 ftlbs (20-30 Nm).

Warning: Risk of bursting. Excessive vibration could weaken the air tank and cause it to rupture or explode. Stiffener bracket bolt must be kept tightened. Never operate the unit unless equipped with the stiffener bracket.

Tighten pulley set screw, torque to 145–180 in.-lbs. (16.4– 20.3 Nm).

Tighten flywheel screw, torque to 15–18 ft.-lbs. (20.3–24.4 Nm).

Contact a DeWALT factory service center or a DeWALT authorized service center.

Check belt tension, see Adjusting Belt Tension under Maintenance.

See Motor Pulley/Flywheel Alignment under Maintenance.

Open the regulator and reduce air tank pressure to less than 40 psi.

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DeWalt D55690, D55695 instruction manual See Motor Pulley/Flywheel Alignment under Maintenance