GRS 901 QC User manual

LIT-118 PAGE 1 of 4
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 o 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.
901™ QC & 901™ Airtact Handpiece
INSTRUCTIONS • #004-901, #004-910, #004-901-AT, #004-901-ATSS, #004-953, & #004-953SS
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
LOOSEN
TURN COUNTERCLOCKWISE
TIGHTEN
TURN CLOCKWISE
FIG. 3
#004-901 & #004-910: Compatible GRS®systems include the GraverMach®AT, GraverMax®G8, GraverMach®,
GraverMax®SC, GraverSmith®, and Classic GraverMax®/ GraverMate®machines.
#004-901-AT, #004-901-ATSS, #004-953, & #004-953SS: Compatible GRS®systems include GraverMach®AT, or an
Airtact Control System (#004-935) connected to a GraverMax®G8, GraverMach®, GraverMax®SC, GraverSmith®, or
Classic GraverMax®/ GraverMate®(with Airtact Filter Hook Up Kit) machines.

PAGE 2 of 4 LIT-118
After loosening you can turn the chuck retainer out with your finger 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
dicult when reassembling. Use a very small
amount of synthetic lube or Teflon grease and
create a thin film around the OUTSIDE of the
handpiece body 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 Teflon Grease on the shaft of a quick change holder
will make them easier to slip in and out.
Fine Spring Option
The Fine Spring oers you the option to tune the 901’s power for finer
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 finger 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.
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
004-411-V2 Standard Spring
1.330" (34mm)
Illustration from LIT-138
Very Light
synthetic grease film
Fig. 8

LIT-118 PAGE 3 of 4
Part # Description
002-950 8-32 X .13
002-605 Allen Wrench
002-759 O-Ring 1/2" ID X 1/16" Wide
002-948 O-Ring 1/8" ID X 1/16" Wide
004-403SS Locking Nut
004-404SS Handle Knob
004-405 Handpiece Body
004-803 (INCLUDES SET SCREW)
004-405
004-432
004-406-V3
004-411V2
004-408 002-948
004-403SS
002-950
002-759
022-285
002-605
004-407 004-404SS
004-410
004-409
022-072
022-284
004-414
002-759
004-430
Part # Description
004-406-V3 Piston / Hammer
004-407 Anvil
004-408 Chuck Receiver
004-409 Air Hose Retainer
004-410 Air Hose - 1/8" ID X 40"
004-411-V2 Spring
004-430 Fine Work Spring
Part # Description
004-432 Air Hose - 1/4" OD X.16 ID X 4"
004-803 Quick Change Chuck
(complete with set screw)
022-072 Tube Coupling
004-414 Washer
022-284 Internal Retaining Ring
022-285 O-Ring 10 mm ID X 1 mm Wide
901™ Airtact Handpiece
PARTS LIST • #004-901-AT & #004-901-ATSS
044-232 022-072
004-432
023-029
023-024
004-803
044-130
004-410
002-605
004-409
004-949-SS
002-759
004-405
004-403SS
004-406-V3
004-411-V2
022-284
004-414
002-948
004-407
022-285
004-408
004-944
044-303
PART # QTY. DESCRIPTION
002-605 1 WRENCH, 5/64 ALLEN
002-759 1 O-RING, 0.625" O.D. 0.500" I.D.
002-948 2 O-RING, 0.250" O.D. 0.125" I.D.
004-403SS 1 LOCKING NUT
004-405 1 HANDPIECE BARREL
004-406-V3 1 PISTON, 901 HP
004-407 1 ANVIL
004-408 1 TOOL RECEIVER (901)
004-409 1 HOSE/BARB RETAINER
004-410 1 TUBING, PU CLR 0.188" O.D. 0.125" I.D.
004-411-V2 1 SPRING 901 ( VERSION 2)
004-414 1 WASHER, 0.250" O.D. 0.119" I.D. x 0.030"
004-432 1 TUBING, PU CLR 0.250" O.D. 0.170" I.D.
004-803 6 QC HOLDER
004-944 1 ACTUATOR PALM CAP AND COVER KIT
FOR AT HANDPIECES
004-949-SS 1 901 PALM ELEMENT KNOB
(STAINLESS STEEL)
022-072 1 TUBE COUPLING, 5/32
022-284 1 C-CLIP, 0.250" INTERNAL
022-285 1 O-RING, 12MM O.D. 10MM I.D.
023-024 4 SHCS, #2-56 x 0.19" S/S
023-029 1 FITTING, M-0.063" I.D.TUBE F-LUER
PART # QTY. DESCRIPTION
044-126 1 FITTING, 0.094" O.D. 0.063" I.D. x 0.35"
044-130 1 TUBING, PU CLR .125" O.D. 0.063" I.D.
044-303 2 SHRINK WRAP, BLK 0.375" I.D.
044-232 1 BRAIDED SLEEVE, 0.313" O.D. NYLON
044-303 2 W/ ADHESIVE
901™ QC Handpiece
PARTS LIST • #004-901

PAGE 4 of 4 LIT-118
044-232
004-432
022-072
004-410
044-130
023-029
044-303
004-409
004-403SS
002-759
023-024
004-949SS
024-201
004-944
PART NO. QTY. DESCRIPTION
002-759 1 O-RING, 0.625"OD 0.500"ID
004-403SS 1 LOCKING NUT
004-409 1 HOSE/BARB RETAINER
004-410 1 TUBING, PU CLR 0.188"OD 0.125"ID
004-432 1 TUBING, PU CLR 0.250"OD 0.170"ID
044-944 1 ACTUATOR PALM CAP AND COVER KIT
FOR AT HANDPIECES
004-949SS 1 901 PALM ELEMENT KNOB (STAINLESS STEEL)
022-072 1 PLASTIC 1/4 TUBE CONNECTOR
023-024 4 SHCS, #2-56 x 0.19" S/S
023-029 1 FITTING, M-.063" IDTUBE F-LUER
024-201 1 PH1 X 50 MM SCREW DRIVER
FOR AIRTACT PALM PADS
044-130 1 TUBING, PU CLR 0.125"OD 0.063"ID
044-232 1 BRAIDED SLEEVE, 0.313"OD NYLON
044-303 2 W/ ADHESIVE
900 Overlander Road • Emporia, KS 66801 USA
800-835-3519 • 620-343-1084 • Fax: [phone]
[email protected] • www.grstools.com
Printed in USA. Products made in USA. All rights reserved. © 2020 Glendo LLC
Last Update: 2020/03/24
901™ Palm Knob Kit
PARTS LIST • #004-953SS
Please Note:
the Palm Pad
mounting screws
should only be
lightly snug; over-
tightening can
distort or damage
the pad.
Palm Pad
#004-901-ATSS & #004-953SS
Control Flap
Palm Pad #8
Moderate to heavy hand force
Palm Pad #10
Most hand force
Palm Pad #4
Least hand force
Palm Pad #6
Light to moderate
hand force