DeWalt D55166, Instruction Manual

English

10

oil and/or substances which may be regulated and must be 
disposed of in accordance with local, state, and federal laws 
and regulations.

1.  Ensure On/Off switch is in the OFF position.
2.  Place a suitable container under the drain valve to catch 

discharge.

3.  When air tank pressure gauge reads 10 PSI (68,9 kPa), 

rotate valve to the fully open position.

4.  Grasp knob on drain valve.
5.  Slowly rotate knob to gradually bleed air from air tank.

WARNING:

 Risk of bursting. Drain air tank daily. 

Water will condense in air tank. If not drained, water 
will corrode and weaken the air tank causing a risk of 
air tank rupture.

NOTICE:

 Risk of property damage. Drain water from 

air tank may contain oil and rust, which can cause 
stains.

6.  Close drain valve when finished.

Compressor Pump Oil (Fig. A, D, I, J)

Checking Oil

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. B). 
Allow compressor to cool prior to servicing.

1.  Ensure On/Off switch is in the OFF position.
2.  Place unit on a flat level surface.
3.  Remove dipstick 

 10 

 and wipe clean.

4.  Reinsert dipstick fully into oil fill port for a few seconds 

to allow oil to collect on the dipstick.

5.  Remove oil dipstick to read oil level. Oil should not 

exceed top raised line on dipstick. If oil is below lower 
mark, add ISO 100/SAE40, non-detergent, premium air 
compressor oil and follow Steps 4 - 6. 

nOTE: 

When filling the crankcase, the oil flows very 

slowly into the pump. If the oil is added too quickly, it 
will overflow and appear to be full.

MA
X

MI

N

FIG. I

10

NOTICE:

 Risk of unsafe operation. Overfilling with 

oil will cause premature compressor failure. Do not 
overfill.

6.  Replace dipstick.
7.  The crank case is full when the oil level reaches the top 

line on the dipstick.

Changing Oil

nOTE: 

Pump oil contains substances that are regulated

and must be disposed of in accordance with local, state and
federal laws and regulations.

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. I). 
Allow compressor to cool prior to servicing.

FIG. J

1.  Ensure On/Off switch is in the OFF position.
2.  Allow the unit to cool.
3.  Remove air compressor plug from outlet.
4.  Drain air tank.
5.  Locate a suitable container under pump drain plug 

 11 

.

6.  Remove the dipstick 

 10 

 from crankcase.

7.  Remove the oil drain plug 

 11 

.

8.  Allow ample time for all oil to drain out. (Tilting the 

compressor towards the drain plug will assist in 
draining.)

9.  Install the oil drain plug.

10.  Fill pump with ISO 100/SAE40, non-detergent, premium 

air compressor oil.

11.  Replace dipstick.

Accessories

WARNING: 

Since accessories, other than those 

offered by 

D

e

WALT

, have not been tested with this 

product, use of such accessories with this tool could be 
hazardous. To reduce the risk of injury, only 

D

e

WALT

recommended accessories should be used with 
this product.

Recommended accessories for use with your tool 
are available at extra cost from your local dealer or 
authorized service center. If you need assistance in 
locating any accessory, please contact 

D

e

WALT

 Industrial 

Tool Co., 701 East Joppa Road, Towson, MD 21286, call 
1–800–4-

D

e

WALT

 (1–800–433–9258) or visit our website: 

www.dewalt.com.

Repairs

The charger and battery pack are not serviceable.

WARNING: 

To assure product SAFETY and 

RELIABILITY, repairs, maintenance and adjustment