GRS 901 Handpiece User manual

PAGE 1 of 2 LIT-118
Adjusting The Handpiece To Fit You
With the locking ring slightly loose, you are able to turn the handpiece body and knob
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.
You can also extend the length of the handpiece a little by unscrewing the knob and
body even more. NOTE: By extending the length you may notice a loss of power
depending on the type of work you are doing.
How To Attach A New Hose
Loosen the locking ring. 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 tting back
into the knob body. Remove the brass tting (#004-409) from the hose. Feed the new
air hose through the hole in the knob (Fig. 1). Insert the brass tting into the end of
the new hose, making sure it is fully seated.
If needed, lubricate the tting rst 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
tting and pull the hose back (Fig. 2) into the knob until you see the tip of the brass
tting protrude through the side of the knob. This must be an air tight t, so you will
have to pull somewhat hard (a few pounds of pressure, at least).
Create A Flat On The Bottom (If Desired)
If you choose to put a at on the knob, use the handpiece rst to nd out where the
hose “exit” is most comfortable for you. Note warranty information to the right.
Maintenance
Keeping the 901 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, rst check if the receiver (chuck) is tight in the handpiece
body. Using a cresent wrench or pliers with a graver inserted in the QC Holder,
gently tighten receiver clockwise (Fig. 3) 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. 3) and turn it counterclockwise to
loosen the chuck retainer. Continued on page 2.
GRS 901 Handpiece INSTRUCTIONS
For GraverMach & GraverMax SC #004-901
Standard Spring Fine Spring
Normal Operating Range 18-22 psi (1.2-1.5 bar) / 1400 - 3400 spm 12-15 psi (0.8-1.0 bar) / 1600 - 3600 spm
Recommended Initial Setting 19 psi (1.3 bar) / 2700 spm 13 psi (0.9 bar) / 3000 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.
Fig. 2
IMPORTANT
Too much material removal will
result in damaged* knob (PART
#004-404).
*Any damage to knob from
creating a at is NOT covered
by warranty.
*METAL REMOVAL PAST MINIMUM DIMENSION WILL DAMAGE KNOB
LOOSEN
TURN COUNTERCLOCKWISE
TIGHTEN
TURN CLOCKWISE
Fig. 3

PAGE 2 of 2 LIT-118
After loosening you can turn the chuck retainer out with you nger tips (Fig. 4).
As you pull out the chuck there will be a spring and piston that follows. Loosen
the locking ring and remove it (Fig. 5). Grip the knob and turn the handpiece
body counterclockwise until it is out of the knob body (Fig. 6).
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 take
away performance!
Reassembly Note
There is an O-ring inside the knob that makes getting
the handpiece body to thread a little difcult when
reassembling. Use a very small amount of synthetic
lube or Teon grease and create a thin lm around the
OUTSIDE of the shaft between the threads and the
end (Fig. 7). See “Adjusting The Handpiece To Fit You”
on p. 1 of this literature sheet for adjusting graver and
hose position.
Quick Change Holder Hint
Synthetic Lube or Teon Grease on the shaft of a quick
change holder will make them easier to slip in and out.
Fine Spring Option
The Fine Spring offers you the option to tune the 901’s power for ner engraving
work. With this spring in the handpiece, the air pressure will need to be
approximately 14 psi.
To Change Springs
Place a Quick Change Holder with a graver in the chuck. Using a wrench or
pliers grip the graver (Fig. 8) and turn it counterclockwise to loosen the chuck
retainer. After loosening you can turn the chuck retainer out with you nger tips.
As you pull out the chuck there will be a spring and piston that follows. Replace
the spring with the shorter “FINE WORK” spring and reassemble.
NOTE: The piston has a hollow end. The hollow end MUST be next to the spring
or it will NOT work properly.
Very Light
synthetic grease film
Fig. 7
Hollow end
Fine Spring
Fig. 4
LOCKING
RING
Fig. 5
Fig. 6
NOTE: Do NOT
use petroleum
based oils - USE
ONLY Synthetic
oils. Fossil oils
can damage
the O-Rings.
Fig. 8
PISTON
The hollow end must be toward spring.
NOTE: Avoid getting any oil or grease on
the piston (even oil from your hands).
1.112" (28mm)
004-430 Fine Work Spring
004-406V2 Standard Spring
1.330" (34mm)
Illustration from LIT-138
900 Overlander Road
P.O. Box 1153
Emporia, KS 66801 USA
Toll-Free: 1-800-835-3519
Phone: [phone]
Fax: [phone]
E-mail: [email protected]
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