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GENERAL DESCRIPTION AND OPERATION
The ARO model 8315 air operated marking pen is a high frequen-
cy tool (approximately 36,000 c.p.m.) used for marking various
hardened tool steels, other metals, plastics, glass, etc. It can be
used as you would a pen or pencil.
The model 8315 features a turn type throttle, which should be
turned to full on position (approximately one full turn -360”) when
starting. The valve can then be rotated towards the off position to
reduce the impact force on the needle when working in softer ma-
terials or if very fine marks are to be made. If the tool does not start,
which may occur if the turn throttle is opened too slowly, lightly tap
the needle with a soft face hammer or against a suitable surface.
For maximum accuracy, hold the marking pen near its point and at
a steep angle to the work piece.
MAINTENANCE
Air tools are made of precision parts and should be handled with
reasonable care when servicing. Excessive pressure exerted by
a holding device may cause distortion of a part. Apply pressure
evenly when disassembling (or assembling) parts which have a
press fit. It is important that the correct tools and fixtures are used
when servicing this air tool.
Disassembly should be done on a clean work bench with a clean
cloth spread to prevent the loss of small parts. After disassembly
is completed, all parts should be thoroughly washed in a clean sol-
vent, blown dry with air and inspected for wear levels, abuse and
contamination.
Before reassembling, lubricate pads where required. Use “0” ring
lube 36460 for “0” ring assembly. When assembling “0” rings or
parts adjacent “0” rings, care must be exercised to prevent dam-
age to the rubber sealing surfaces.
When ordering pans, be sure to list part number, description,
tool model number and serial number.
DISASSEMBLY AND ASSEMBLY
Disconnect air supply from tool or shut off air supply and drain line
of compressed air before changing needle or otherwise perform-
ing maintenance or service to tool.
To change needle, using a wrench on flats of nut (39448) to hold
tool, remove front end (39867). Needle, with “0” ring (Y325-11)
and spring (39865) may now be removed from front end. As-
semble “0” ring (Y325-11) to drive plate of needle, slip spring
(39865) over needle and assemble into front end. Assemble front
end to tool. NOTE: It is recommended “0” ring (Y325-11) be re-
placed each time needle is changed or replaced. Bushing
(39868) is pressed into front end. To remove, press out thru
threaded end. Press new bushing into front end to shoulder on
rear of bushing.
To remove hose from tool, pull hose off barbs of adapter.
To remove valve, valve seat and/or rubber block, hold housing
(39860) in a suitable holding device or strap wrench and using a
wrench on flats of nut (39448), unthread nut completely. Unthread
valve from housing for access to valve seat (39594) and rubber
block (39449). To reassemble, reverse disassembly procedure.
NOTE: It is recommended any time a part has been disassembled
that contains an “0” ring, that the “0” ring be replaced.
PN 49999-369