GRS 901 QC Instructions

901™ QC & 901™ Airtact Handpiece
INSTRUCTIONS • #004-901, #004-910, #004-901-AT, #004-901-ATSS, #004-953, & #004-953SS
#004-901 & #004-910: Compatible GRS
GraverMax SC, GraverSmith
®
#004-901-AT, #004-901-ATSS, #004-953, & #004-953SS: Compatible GRS
Airtact Control System (#004-935) connected to a GraverMax
Classic GraverMax / GraverMate
®
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
PSI: Pounds per Square Inch • Bar: Unit of Measurement • SPM: Strokes Per Minute

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).

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.
systems include the GraverMach
®
, and Classic GraverMax
®
(with Airtact Filter Hook Up Kit) machines.
®
Standard Spring
19 psi (1.3 bar) / 2700 spm
AT, GraverMax
®
/ GraverMate machines.
® ®
systems include GraverMach
®
G8, GraverMach
®
Fine Spring
G8, GraverMach
®
, GraverMax SC, GraverSmith
® ®
13 psi (0.9 bar) / 3000 spm
LOCKING RING
Loosen first
FIG. 1
FIG. 2
FIG. 3
TIGHTEN
TURN CLOCKWISE
LOOSEN
TURN COUNTERCLOCKWISE
,
®
AT, or an
®
, or
®
Lubricate end
slightly with
water or a small
amount of oil.
LIT-118 PAGE 1 of 4