Craftsman 172.28129 User's Manual | Page 11

Craftsman Drill User's Manual - 172.28129.
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MAINTENANCE cont.

CHUCK REMOVAL 

(Fig. 16, 16a and 16b) 
The chuck may be removed and replaced 

with a new one.
1. Unplug the hammer drill.

MAINTENANCE

It has been found that electric tools are subject to accelerated wear and possible 

premature failure when they are used to work on fiber glass boats and sports cars, 

wallboard, spackling compounds or plaster. The chips and grindings from these materials 

are highly abrasive to electrical tool parts, such as bearings, brushes, commutators, etc. 

Consequently, it is not recommended that this tool be used for extended work on any 

fiberglass material, wallboard, spackling compound or plaster. During any use on these 

materials, 

it is extremely important that the tool is cleaned frequently by blowing with 

an air jet.

Periodic maintenance allows for long life and trouble-free operation. A cleaning, lubrication 

and maintenance schedule should be maintained. As a common preventive maintenance 

practice, follow these recommended steps:

1. When work has been completed, clean the tool to allow smooth functioning of the tool 

    over time.
2. Use clean damp cloths to wipe the tool.
3. Check the state of all power cords.
4. Keep the motor air vent openings free from oil, grease and sawdust or woodchips, 

    and store tool in a dry place.
5. Be certain that the chuck and jaws are well lubricated with a light machine oil, particularly 

    after lengthy exposure to damp and/or dirty conditions.
6. Apply a light coat of machine oil to the surface of the chuck face and jaws from time 

    to time for rust resistance.

!

      

WARNING: To ensure safety and reliability, repairs, maintenance and 

 adjustments MUST be performed by a qualified service technician at a 

 Sears Service Center.

!

      

WARNING: For your safety, ALWAYS turn off switch and unplug drill from 

 the power source before performing any maintenance or cleaning.

!

      

WARNING: Always wear safety goggles or safety glasses with side shields 

 during power tool operations, or when blowing dust. If operation is dusty, also 

 wear a dust mask.

!

      

WARNING: DO NOT at any time let brake fluids, gasoline, petroleum-based 

 products, penetrating oils, etc. come in contact with plastic parts. Chemicals can 

 damage, weaken or destroy plastic, which may result in serious personal injury.

!

      

WARNING: For your safety, ALWAYS turn off switch and unplug saw from 

 the power source before performing any maintenance or cleaning.  

ROUTINE MAINTENANCE

!

      

WARNING: To prevent personal 

 injury, ALWAYS disconnect the plug 

 from power source BEFORE 

 assembling parts, making adjustments 

 or changing bits.

Fig. 10

4

5

6

7

0

1

7

 2. Insert a 5 /16-in. or larger hex key into the 

     chuck of the drill and tighten the chuck 

     jaws securely with the chuck key and

     spindle lock.
 3. Tap the hex key sharply with a mallet in a 

     clockwise direction. This will loosen the 

     screw in the chuck for easy removal.
 4. Open the chuck jaws and remove the 

     hex key. Using a screwdriver, remove the 

     chuck screw by turning it in a clockwise 

     direction (see Fig. 16a). Note that the 

     chuck screw has left hand threads and 

     clockwise direction loosens instead of 

     tightens.
 5. Insert the hex key into the chuck and 

     tighten the chuck jaws securely. Tap 

     sharply with a mallet in a counterclockwise 

     direction (see Fig.16b). This will loosen 

     the chuck on the spindle. It can now be 

     unscrewed by hand.

Fig. 16

Fig. 16a

Fig. 16b

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