Operation

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

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.

Feedback Control

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

WARNING!

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

Selecting Action (Fig. 5)

The stop rotation knob may be set for either “hammering-only” or “ham- mering-with-rotation”. The 5346-21 and 5346-28 Rotary Hammers have a third setting that allows the angle of the chisel blade to be adjusted.

Fig. 5

Cat. No. 5346-21 and 5346-28

1.Hammering only. For use with “hammering-only” accessories. Use this setting (1) for chiseling or setting self-drilling anchors.

2.Hammering with rotation. Use this setting (2) for drilling holes with drill bits.

3.Chisel adjustment. (Cat. No. 5346-21 and 5346-28) Use this setting

(3) to adjust the angle of the chisel blade in relation to the tool. With a chisel mounted in the tool:

•turn the knob to this setting

•twist the chisel to the desired angle

•set the tool for hammering only

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

Hammering Only

Spline Drive System (Cat. No. 5345-21)

When a chisel (or other “hammering-only” accessory) is mounted into the 5345-21 Rotary Hammer and the stop rotation knob is set for “ham- mering-with-rotation”, the rotational drive mechanism does not engage with the chisel, even though the rotational drive mechanism is running. The 5345-21 can use chisels in the “hammering-with-rotation” setting or the “hammering-only” setting.

Hammering Only

SDS Max Drive System (Cat. No. 5346-21 and 5346-28)

When using chisels (or other “hammering-only” accessories) in the 5346-21 and 5346-28 Rotary Hammers, the stop rotation knob MUST be set in the “hammer-only” setting. The rotational drive mechanism en- gages with the chisel (or other “hammering-only” accessory) when it is mounted into the tool and the stop rotation knob is set for “hammering- with-rotation”.

NOTE: These rotary hammers must be set in the “hammering-only” setting when setting self-drilling anchors. See “Setting Self-Drilling Anchors" for complete instructions.

WARNING!

To reduce the risk of injury, when using chisels or other hammering-only accessories in the 5346-21 and 5346-28 Rotary Hammers, set the tool in the “hammering- only” position.

Selecting Speed

These rotary hammers have a speed control dial. The speed control dial 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 for faster penetration when drilling and chiseling in demolition work.

Starting and Stopping the Tool

1.To start the tool, pull trigger.

2.To stop the tool, release trigger.

Cold Starting

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 or chisel into the tool.

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

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

page 6