GRS 901 Handpiece Instructions

GRS 901 Handpiece
For GraverMach & GraverMax SC
Normal Operating Range
Recommended Initial Setting

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 fitting back
into the knob body. Remove the brass fitting (#004-409) from the hose. Feed the new
air hose through the hole in the knob (Fig. 1). 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. 2) 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 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 flat on the knob, use the handpiece first to find out where the
hose "exit" is most comfortable for you. Note warranty information to the right.
*METAL REMOVAL PAST MINIMUM DIMENSION WILL DAMAGE KNOB

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, first 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.
Standard Spring
18-22 psi (1.2-1.5 bar) / 1400 - 3400 spm
19 psi (1.3 bar) / 2700 spm
PSI: Pounds per Square Inch • Bar: Unit of Measurement • SPM: Strokes Per Minute
InsTRUCTIons
12-15 psi (0.8-1.0 bar) / 1600 - 3600 spm
13 psi (0.9 bar) / 3000 spm
LoCKInG RInG
Loosen first
Fig. 1
Fig. 3
TURn CoUnTERCLoCKWIsE
#004-901
Fine Spring
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 flat is NOT covered
by warranty.
TIGHTEN
TURn CLoCKWIsE
LOOSEN
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