Operation

LockingtheTrigger(Cat.No.5337-20,5339-20only) The lock button on the demolition hammers holds

If a hammer iron gets stuck:

1. Unplug the tool.

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 gradu- ally 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. Spall- ing 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 rotation is available. Only chisels and other "hammering-only" accessories should be used.

Cat. No. 5339-20

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 "hammer- ing-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

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	Chisel	Hammering
Hammering	Chisel	Hammering
Only	Adjustment	with 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 "ham- mering 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 ac- tion 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 hammering-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.

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.

Cold Hammering

If the hammer is stored for a long period of time or at cold temperatures, the lubrication may become stiff and the tool may not hammer initially or the hammering may be weak. If this happens:

1.Insert a chisel into the tool.

2.Pull the trigger and apply the chisel against a scrap piece of concrete.

3.Turn the tool On and Off every few seconds. After 15 seconds to 2 minutes, the tool will start hammering normally. The colder the hammer is, the longer it will take to warm up.

Operator Force

These hammers feature the Vibration Isolation System to provide the operator with comfort without sacriﬁcing power or performance. The motor hous- ing is suspended independently from the switch handle. Insulating elements absorb vibration when hammering and drilling.

Ideal operator force compresses the handle slight- ly and allows the tool to work aggressively while the handle provides maximum vibration dampening.

Excessive operator force compresses the handle too far and reduces the vibration dampening. Users will be able to feel the difference and should adjust the force to the handle accordingly.

WARNING Applying greater pressure does not increase the tool's effectiveness. If the applied working pressure is too high, the shock absorber will be pushed together making vibration to the handle noticeably stronger.

Hammering Only

1.Insert a chisel or other "hammering only" ac- cessory into the tool (see "Installing Bits and Chisels").

2.Position the tool on the workpiece.

3.Grasp both handles ﬁrmly (trigger handle and either the spade handle or straight handle).

4.Pull the trigger. Always hold the tool securely using two handles and maintain control.

5.Use only enough pressure to hold the tool in place, engage the hammering mechanism, and prevent the tip of the chisel from wandering. This tool has been designed to achieve top performance with only moderate pressure. Let the tool do the work.

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

6.When chiseling or chipping, hold the tool at an angle to the work area. For best performance, work from a corner or close the edge of the work and break off a small area at a time.

2.	Pull out bit lock and rotate it 180°.
3.	Pull the tool off of the stuck accessory.
4.	Remove the accessory from the workpiece.

Hammering with Rotation

1.Insert a drill or coring bit into the tool (see "Install- ing Bits and Chisels").

2.Position the tool on the workpiece.

3.Grasp both handles ﬁrmly (trigger handle and straight handle).

WARNING To reduce the risk of injury, hold or brace securely. Always be prepared for drill reaction when bit binds, when hole becomes clogged, when striking embedded materials, and during hole breakthrough.

4.Pull the trigger. Always hold the tool securely using the straight handle and trigger handle and maintain control.

5.Use only enough pressure to hold the tool in place, engage the hammering mechanism, 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. When pressure is released, hammering stops.

6.When drilling deep holes, the speed may begin to drop off. 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 a bit binds:

If the bit should bind, a built in, nonadjustable slip clutch prevents the bit from turning when the tool is held or braced securely. If this occurs

1.Turn off and unplug the tool.

2.Free the bit from the workpiece.

3.Clear debris from the hole.

4.Begin drilling again.

WARNING Use MILWAUKEE core bits Cat. No. 48-20-5125 through 48-20-5165. Do not use LHS (Large Hole System) Components with rotary hammers 5340-20 and 5342-20. The bits could fail, breaking apart at the threaded stud and causing injury and property damage.

Using Rotary Percussion Core Bits

Core bits are useful for drilling larger holes for conduit and pipe. MILWAUKEE Heavy-Duty Core Bits have heat-treated steel bodies with durable carbide tips. These core bits are specially 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.

2.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).

5339-21, 5337-20, 5342-20, 5340-21, 5339-20 specifications

Milwaukee, a renowned name in the power tool industry, has been consistently delivering innovative solutions that enhance productivity and efficiency for professionals and DIY enthusiasts alike. Among its impressive lineup, the models 5342-21, 5337-21, 5340-20, 5339-20, and 5340-21 stand out for their unique features and advanced technologies.

The Milwaukee 5342-21 is a powerful tool designed to streamline tasks with precision. It incorporates a robust brushless motor that offers increased efficiency and extended battery life. The tool’s compact design enhances maneuverability, making it ideal for tight spaces while still delivering high torque performance. Its adjustable speed settings allow users to tailor the performance according to the specific requirements of each job.

Next in line, the Milwaukee 5337-21 showcases significant advancements in technology. This model is equipped with an advanced electronic system that provides overload protection, ensuring longevity and durability. Additionally, it features a built-in LED light that illuminates work areas, facilitating visibility in low-light conditions. With its ergonomic design, the 5337-21 reduces user fatigue during prolonged use.

Moving on to the Milwaukee 5340-20, this cordless tool takes versatility to the next level. It boasts multiple attachments, allowing users to switch from cutting to sanding with ease. The unit is powered by a high-capacity Li-ion battery, which not only ensures prolonged runtime but also quick charging capabilities. The 5340-20's variable speed control provides adaptability across various materials, making it a reliable choice for diverse applications.

The Milwaukee 5339-20 is another remarkable addition, featuring an innovative dust extraction system. This design helps keep the workspace clean and reduces health hazards associated with dust inhalation. Coupled with its powerful performance, the 5339-20 excels in applications like grinding and polishing, where dust management is crucial.

Finally, the Milwaukee 5340-21 rounds out this impressive lineup with enhanced safety features and improved user control. With an anti-vibration system integrated into the handle, it minimizes user fatigue and discomfort during extended operations. Additionally, the model includes safety locks and guards that ensure secure operation without compromising performance.

In conclusion, Milwaukee's 5342-21, 5337-21, 5340-20, 5339-20, and 5340-21 are prime examples of how technology and innovation come together to meet the evolving demands of the industry. Each model presents unique features tailored for professionals seeking durability, efficiency, and unparalleled performance in their work. These tools stand out not only for their capabilities but also for their commitment to user comfort and safety.