Power Fist 8416331, User Manual, Page: 11 / 24

1/2 in. Hammer Drill
11
For technical questions call: 1-800-665-8685
8416331 V 2.0
CHUCK REMOVAL
The drill chuck must be removed in order to use some accessories.
To remove the chuck:
1. Unplug the drill from the power source.
2. Insert a 5/16 in. or larger hex hey (1) into the chuck (2) and tighten the
chuck jaws securely. Make sure each of the three chuck jaws (3) are
seated on a flat surface of the hex key (See Figure 10).
3. Tap the hex key sharply with a mallet (4) in a clockwise direction. This
action will loosen the screw in the chuck for easy removal.
4. Open the chuck jaws and remove the hex key.
5. Open the chuck jaws as far as possible using the chuck key.
6. Remove the chuck screw using a #2 Philips
®
screwdriver (See Figure 11).
NOTE: Turn the screw CLOCKWISE to remove it. This screw has a
left hand thread.
7. Insert the hex key into the chuck and tighten the jaws of the chuck
securely (See Figure 12). Tap the hex key sharply with a mallet in a
COUNTER CLOCKWISE direction. This will loosen the chuck on the
spindle. The chuck can now be unscrewed and removed from the spindle
by hand.
RETIGHTENING LOOSE CHUCK
After installing the chuck once it has been removed, the chuck may become loose
on the spindle and develop a wobble. Also, the chuck screw may become loose
Figure 10
Figure 11
Figure 12
causing the chuck jaws to bind and prevent them from closing. To tighten the chuck,
follow these steps:
1. Insert the hex key into the chuck and tighten the chuck securely.
2. Tap the hex key sharply with a mallet in a CLOCKWISE direction (See Figure 10).
This will tighten the chuck on the spindle.
3. Open the chuck jaws and remove the hex key.
4. Tight the chuck screw using a #2 Philips
®
screwdriver.
NOTE: Turn the screw COUNTER CLOCKWISE to tighten it. This screw has a left hand thread.
MAINTENANCE
WARNING! When servicing, use only identical replacement parts. Use of any other part may create a hazard or
cause product damage.
• DO NOT use solvents when cleaning the plastic parts. Plastics are susceptible to damage from
various types of commercial solvents and may be damaged by their use. Use a clean cloth to remove dirt,
dust, oil, grease etc.
• WARNING! Do not at any time allow brake fluids, gasoline, petroleum-based products, penetrating oils,
etc. to come into contact with plastic parts. They contain chemicals that can damage, weaken
or destroy the plastic.
• WARNING! To avoid fire or toxic reaction, never use gasoline, naphtha, and acetone, lacquer thinner or
similar highly volatile solvents to clean the tool.
• DO NOT abuse power tools. Abusive practices can damage the tool as well as the workpiece.
• WARNING! DO NOT attempt to modify tools or create accessories. Any such alteration or modification
is misuse and could result in a hazardous condition leading to possible serious injury.