Checking Belt Tension (Fig. 1)

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.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 eight belt guard screws.

6.Remove outer belt cover.

7.Measure belt tension. Proper tension is achieved when a three

(3) pound 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.

8.Replace belt guard.

9.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. Ensure engine ON/OFF switch (C) is in the OFF position.

8.

Loosen but do not remove pump stiffener

T

 

bracket bolt (T).

 

 

 

 

 

 

 

 

9.

Turn belt tensioning (S) bolt

 

 

clockwise to increase belt tension or

English

 

Maintenance.

 

 

 

 

counterclockwise to loosen belt tension.

 

10.

Check the belt tension again. See Step

 

 

7 in Checking Belt Tension under

 

11.

When tension is correct, retighten four

S

 

pump

mounting

bolts

(torque

to

 

18– 22 ft.- lbs./24.4–29.8 Nm), stiffener

 

 

bracket bolt (torque to 18–22 ft.-lbs./

 

 

24.4– 29.8 Nm), and replace belt cover.

 

12. 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.

2.

Allow the unit to cool.

3.

Disconnect spark plug wire.

4.

Drain air tank

5.

Loosen but do not remove four pump mounting bolts.

6.

Remove eight belt cover screws.

7.

Remove outer belt cover.

6.Place a straightedge

(U)against the outside of the flywheel (W) and the engine drive pulley

W

A1

V

A2 B1

B2

 

 

 

X

 

 

 

 

 

A1

U

A2 B1

B2

 

 

17

Page 16 Page 18
Page 17
Image 17
DeWalt D55273 Checking Belt Tension Fig, Adjusting Belt Tension, Pulley and Flywheel Alignment, Maintenance
Page 16 Page 18

D55273 specifications

The DeWalt D55273 is a robust and highly efficient pneumatic air compressor designed to meet the needs of both professionals and DIY enthusiasts. Renowned for its reliability and performance, this model is particularly popular among contractors involved in framing, roofing, and other heavy-duty applications.

One of the standout features of the D55273 is its high-efficiency compressor pump, which delivers an impressive air output while minimizing downtime. The unit boasts a powerful motor that operates at a substantial 4.5 CFM at 90 PSI, allowing it to quickly recharge the tank and maintain consistent pressure for various pneumatic tools. This ensures that users can work continuously without frequent interruptions for recharging.

The D55273 incorporates DeWalt's patented Quiet Technology, making it one of the quieter options in the industry. With a sound level of just 75 dBA, this compressor is ideal for indoor jobs or residential areas where noise levels are a concern. This feature not only enhances user comfort but also reduces the noise pollution that often accompanies pneumatic tools.

Durability is a key characteristic of the D55273. Constructed with high-quality materials, it features a rugged, oil-free pump that requires minimal maintenance and prolongs the life of the compressor. Additionally, the unit is designed with a sturdy frame, making it easy to transport and store without worrying about damage. The integrated handle and rubber grip make it convenient to maneuver on job sites.

Another notable technological advancement in the D55273 is its efficient cooling system. This air compressor is designed with an advanced airflow system that optimizes cooling during operation, reducing the risk of overheating. This capability ensures reliability during extended use, providing peace of mind to users working on demanding projects.

Furthermore, the unit comes equipped with dual quick couplers, allowing for simultaneous connections of two tools, increasing productivity on the job site. The pressure gauges provide accurate readouts, enabling users to easily monitor and adjust the pressure to suit various applications.

Overall, the DeWalt D55273 air compressor combines power, efficiency, and user-friendly features to provide a reliable solution for all pneumatic needs. Whether tackling a large construction project or a small home improvement task, this air compressor delivers the performance and durability professionals demand.
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