Operation

Cold Starting

Fig. 5

WARNING

To reduce the risk of injury, wear safety goggles or glasses with side shields. Unplug the tool before changing accessories or making adjustments.

Selecting Action (Fig. 3)

MILWAUKEE 7/8" Rotary Hammers have two settings: drilling only and hammering with rotation.

Fig. 3

Hammer

symbol Drill

symbol

1.To select drilling only, rotate the shift knob 180° in the direction of the double arrow so that the tab portion of the knob points toward the “Drill” symbol. Do not shift the tool when it is running or coast- ing to a stop.

When drilling in wood or steel, shift knob to drilling and use chuck adapter kit (see “Accessories”).

2.To select hammering with rotation, rotate the shift knob 180° in the direction of the double arrow so that the tab portion of the knob points toward the “Hammer” symbol.

NOTE: To engage the hammering mechanism, maintain pressure on the bit. When pressure on the bit is released, the hammering action will stop.

Using the Forward/Reverse Switch (Fig. 4)

Fig. 4

Reverse

Forward

Reverse

Forward

1.For forward (clockwise) rotation, push the forward/reverse switch to forward as shown.

2.For reverse (counterclockwise) rota- tion, push the forward/reverse switch to reverse as shown. Check the direction of rotation beofre use. Although an in- terlock prevents Using forward/reverse switch (Fig. 4) Check the direction of rotation before use. Although an inter- lock prevents reversing the tool while the motor is running, allow the motor to come to a full stop before reversing.

Starting, Stopping & Controlling Speed

1.To start the tool, pull the trigger

2.To stop the tool, release the trigger.

3.To vary the driving speed, simply in- crease or decrease pressure on the trigger. The further the trigger is pulled, the greater the speed.

If this tool is stored for a long period of time or at cold temperatures, it may not hammer initially because the lubrication has become stiff. To warm up the tool:

1.Insert and lock a bit into the tool.

2.Turn the tool on, applying force to the bit against a concrete or wood surface.

3.Turn the tool on and off every few sec- onds. In a short time, the tool will start hammering. The colder the tool is, the longer it will take to warm it up.

Operation

Position the tool, grasp the handles ﬁrmly and pull the trigger.

Always hold the tool securely using both handles and maintain control. Use only enough pressure to hold the tool in place and prevent the tip of the bit from wandering. This tool has been designed to achieve top performance with only moderate pressure. Let the tool do the work.

If the speed begins to drop off when drilling deep holes, pull the bit partially out of the hole while the tool is running to help clear dust.

NOTE: Do not use water to settle the dust since it will clog the bit ﬂutes and tend to make the bit bind in the hole. If the bit should bind, a built-in, non-adjustable slip clutch pre- vents the bit from turning. If this occurs, stop the tool, free the bit and begin again.

Using Rotary Percussion Core Bits (Fig. 5 - 8)

Core bits are useful for drilling larger holes for conduit and pipe. MILWAUKEE Thin Wall Core Bits have heat-treated steel bodies with durable carbide tips. These core bits are spe- cially designed for fast, accurate drilling with combined hammering and rotary action.

1.Clean and lubricate the threads on the adapter and core bit to make later removal easier. Screw the threaded end of the adapter into the rear of the core bit.

NOTE: For core bits 1- 1/4" and larger, push the guide plate onto the pointed end of the center pin. Insert the center pin and guide plate assembly into the core bit. Be sure the small end of the center pin is securely placed into the hole in the center of the core bit (Fig. 5).

2.Insert the adapter into the nose of the tool as described in “Installing Bits”. Set the hammer/drill shift knob to hammer- ing with rotation.

3.Press the center pin ﬁrmly against your center mark, hold the tool ﬁrmly and pull the trigger (Fig. 6).

Fig. 6

NOTE: If a center pin and guide plate are not available, use a template or notched board to start the hole (Fig. 7).

Fig. 7