Milwaukee Rotary Hammer manual Operation

OPERATION

Electronic Feedback Control Circuit

These hammers have an Electronic Feedback Control Circuit (EFCC) which helps improve the operation and life of the tool.

Feedback Control

The electronic speed control circuit allows the tool to maintain constant speed and torque between no-load and load conditions.

Soft Start

The Soft-Start feature reduces the amount of torque reaction to the tool and the user. This feature gradually increases the motor speed up from zero to the speed set by the speed control dial.

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 Speed

The speed control dial on these hammers allows the user to adjust the rotating speed (RPM) and the impact rate (BPM) of the tool.

To change the speed, set the speed control dial to the desired setting.

•Lower speeds provide more control when starting holes and reduce 'spalling' on breakthrough. Spalling occurs when pieces of material chip off around the drilled hole on breakthrough. When chiseling in soft or brittle materials, use lower speeds to reduce damage to surrounding areas of the material.

•Higher speeds provide faster penetration when drilling and chiseling in demolition work.

Selecting Action

Cat. No. 5337-20

The cat. no. 5337-20 demolition hammer is for "hammering-only". No rota- tion is available. Only chisels and other "hammering-only" accessories should be used.

Cat. No. 5339-20 (Fig. 3)

The cat. no. 5339-20 demolition hammer is for "hammering-only". No rotation is available. The action selector is used to select the action:

Fig. 3

Hammering Only Chisel Adjustment

1.Hammering only. For use with "hammering only" accessories. Use this setting for chiseling.

2.Chisel adjustment. Use this setting to adjust the angle of the chisel blade in relation to the tool. With a chisel mounted in the tool, twist the chisel to the desired angle. Then, rotate the action selector to the "hammering only" setting for use.

NOTE: To engage the hammering mechanism, maintain pressure on the bit/chisel. When pressure is released, hammering stops.

Cat. No. 5340-20

The cat. no. 5340-20 rotary hammer has "hammering-only" and "hammering with rotation", depending on the type of shank inserted into the tool.

For "hammering-only":Insert a chisel or other "hammering-only" accessory with a 3/4" Hex with 21/32" Round shank into the nose of the tool (see "Inserting Bits and Chisels"). The rotational drive mechanism will run but not engage with the chisel, resulting in "hammering-only" action.

For "hammering with rotation": Insert a drill or coring bit with a spline shank into the nose of the tool (see "Inserting Bits and Chisels"). The rotational drive mechanism engages with the bit, resulting in "hammering

with rotation" action.

Cat. No. 5342-20 (Fig. 4)

Cat. no. 5342-20 rotary hammer has "hammering-only", "hammering with rotation", and "chisel adjustment" settings. The action selector is used to select the action:

Fig. 4		Hammering with
Hammering Only	Chisel Adjustment
		Rotation

1.Hammering only. For use with "hammering only" accessories. Use this setting for chiseling.

2.Hammering with rotation. Use this setting for drilling holes with drill bits. Do not use "hammering with rotation" when using chisels or other "hammering-only" accessories.

3.Chisel adjustment. Use this setting to adjust the angle of the chisel blade in relation to the tool. With a chisel mounted in the tool, twist the chisel to the desired angle. Then, rotate the action selector to the Hammering only setting for use.

NOTE: To engage the hammering mechanism, maintain pressure on the bit/chisel. When pressure is released, hammering stops.

WARNING

To reduce the risk of injury, when using chisels or other hammer- ing-only accessories in cat. no. 5342-20, the action selector must be set to the "hammering only" position.

Starting and Stopping the Tool

1.To start the tool, pull the trigger.

2.To stop the tool, release the trigger.

Locking the Trigger (Cat. No. 5337-20, 5339-20 only)

The lock button on the demolition hammers holds the trigger in the "On" position for continuous use.

1.To lock the trigger, hold in the lock button while pulling the trigger. Release the trigger.

2.To unlock the trigger, pull the trigger and release. The lock button will pop out.

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