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PAGE 1 of 4       LIT-258

ADJUSTING THE HANDPIECE

To position the hose, loosen the locking ring a little. With the locking ring slightly 

loose, the handpiece body and knob can be turned independently. Position the 

Quick Change holder with the graver “point” down. Rotate the knob until the 

hose position is comfortable, then tighten the locking ring.
The length of the handpiece can  be extended a little by unscrewing the knob 

and body even more. NOTE: When the handpiece length is extended, a loss of 

power may occur, depending on the type of work being done.

ATTACHING A NEW HOSE

Loosen the locking ring (FIG. 1). Remove the knob from the handpiece. Remove 

the hose by cutting it off close to the knob. With a small punch, push the hose / 

brass fitting back into the knob body. Remove the brass fitting (#044-031) from 

the hose. Feed the new air hose through the hole in the knob (FIG. 2). Insert the 

brass fitting into the end of the new hose, making sure it is fully seated. 
If needed, lubricate the fitting first to help it slip into the hose easier. Then apply a 

small amount of water or oil around the outside end of the hose next to the brass 

fitting and pull the hose back (FIG. 3) into the knob until you see the tip of the 

brass fitting protrude through the side of the knob. This must be an air tight fit, so 

a bit of force may be needed (a few pounds of pressure, at least).

MAINTENANCE

Keep the Magnum handpiece clean on the inside. Problems will occur if oil or 

moisture gets into the handpiece, especially on the piston. If you notice a loss 

of power or erratic performance, first check if the receiver (chuck) is tight in the 

handpiece body. Using a crescent wrench or pliers with a graver inserted in 

the QC Holder, gently tighten receiver clockwise (FIG. 4) If erratic performance 

continues, then disassemble and clean the handpiece. To disassemble the 

handpiece, use the crescent wrench or pliers to grip the graver (FIG. 4) and 

turn it counterclockwise to loosen the chuck retainer.
After loosening, turn the chuck retainer out with your finger tips (FIG. 5). As the 

chuck is pulled out, there will be a spring and piston that follows. Loosen the 

locking ring and remove it (FIG. 6). Grip the knob and turn the handpiece body 

counterclockwise until it is out of the knob body (FIG. 7)
Now, with the handpiece disassembled, clean the parts with a non-residue 

solvent like denatured alcohol. Make sure the holes in the handpiece body 

are clear from dirt and debris. DO NOT get moisture down the air hose. If this 

happens you will need to clear and dry it before reassembly. 
Before reassembly, make sure every thing is completely dry. DO NOT OIL 

INSIDE THE HANDPIECE. NO lubricant is required. Lubricant will actually 

decrease performance!

Magnum

®

 & Magnum

®

 Airtact Handpiece 

INSTRUCTIONS • #004-940, #004-940-OVAL , #004-941, #004-940-ATSS & #004-957SS

Standard Spring

Normal Operating Range

18-22 psi (1.2-1.5 bar) /  

1400 - 3400 spm

Recommended Initial Setting

19 psi (1.3 bar) / 2700 spm

PSI: Pounds per Square Inch  •  Bar: Unit of Measurement  •  SPM: Strokes Per Minute 

LOCKING RING 

Loosen first

FIG. 1

Lubricate end 
slightly with 
water or a small 
amount of oil.

LOOSEN

TURN COUNTERCLOCKWISE

TIGHTEN

TURN CLOCKWISE

LOCKING 

RING 

FIG. 2

FIG. 3

FIG. 4

FIG. 5

FIG. 6

FIG. 7

Summary of Contents for Magnum

Page 1: ...piston If you notice a loss of power or erratic performance first check if the receiver chuck is tight in the handpiece body Using a crescent wrench or pliers with a graver inserted in the QC Holder gently tighten receiver clockwise FIG 4 If erratic performance continues then disassemble and clean the handpiece To disassemble the handpiece use the crescent wrench or pliers to grip the graver FIG 4...

Page 2: ... will make them easier to slip in and out NOTE Do NOT use petroleum based oils USE ONLY Synthetic oils Fossil oils can damage the O Rings PART NO DESCRIPTION 002 127 O RING 002 605 HEX WRENCH 5 64 004 803 QC HOLDER 022 072 BARBED FITTING FOR 1 4 X 040 WALL TUBING 022 946 O RING 022 947 O RING 1mm X 12 5mm 022 948 O RING 70 DUROMETER 044 020 ANVIL 044 021 THREADED RETAINER 044 022 TOOL RECEIVER 044...

Page 3: ...4 031 1 HOSE RETAINER 044 110 D1 3 PALM PAD E2 04 044 110 E2 06 3 PALM PAD E2 06 044 110 E2 08 3 PALM PAD E2 08 044 110 E2 10 3 PALM PAD E2 10 044 126 1 FITTING 0 094 O D 0 063 I D x 0 35 044 130 1 TUBING PU CLR 0 125 O D 0 063 I D 044 162SS 1 PALM KNOB MAGNUM 044 204 2 0 500 DIA BLACK SHRINK TUBING 044 219 1 INLET INSERT FOR MAGNUM AT KNOBS 044 231 1 BRAIDED SLEEVE 0 375 O D NYLON PART NO DESCRIP...

Page 4: ...th a lower number palm pad installed Initially palm pads can be stiff This affects the feel and control Stiffness may be reduced naturally with a few hours of use To reduce stiffness quickly bend and twist the control flap to soften When the preferred softness is nearly reached stop and test frequently to adjust until desired responsiveness is attained The rubber control flap can be formed for a custom ...

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