GRS Magnum Instructions

Magnum
INSTRUCTIONS • #004-940, #004-940-OVAL , #004-941, #004-940-ATSS & #004-957SS
Normal Operating Range
Recommended Initial Setting
PSI: Pounds per Square Inch • Bar: Unit of Measurement • SPM: Strokes Per Minute
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
®
Standard Spring
18-22 psi (1.2-1.5 bar) /
1400 - 3400 spm
19 psi (1.3 bar) / 2700 spm
Airtact Handpiece
®
FIG. 2
FIG. 3
FIG. 4
FIG. 5
FIG. 6
LOCKING RING
FIG. 7
LOCKING RING
Loosen first
Lubricate end
slightly with
water or a small
amount of oil.
TIGHTEN
TURN CLOCKWISE
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