OPERATORS
This Parts List and Service Instruction Manual is composed of four sections:
GENERAL DESCRIPTION AND OPERATION AIR AND LUBE REQUIREMENTS MAINTENANCE
DISASSEMBLY AND REASSEMBLY OF TOOL
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A complete Parts List will be found on the various drawings contained in this Manual.
This Manual is provided to serve as an aid in obtaining the maximum service from this tool.
After carefully reading this manual, file for future reference.
GENERAL DESCRIPTION AND OPERATION
TheAROModels8274-( )A and 8276-( )A PowerMotors feature “2200” series motors with “44”series gearing. Models 8274-( )A are reversible rotation models with a balanced cylinder which producesthe same power in either forward or reverse rotation. Models 8276-( )A are single direction models.
All models have an adjustable exhaust manifold with muffler, flush fittings for lubrication, l/4” female n.p.t.f. air inlet and optional air inlets at end of side of head housing with necessary hex socket screw plugs for closure of unused inlets.
AIR AND LUBE
AIR PRESSURE of 90 pounds per square inch at the air inlet of the tool is required for maximum motor efficiency. If necessary, an air regulator should be installed to maintain this pressure when tool is in operation.
FILTERED AND OILED AIR will allow the tool to operate more efficiently and yield a longer life to operating parts and mechanisms. A line filter capable of filtering particles larger than 50 microns should be used with a line oiler.
FLUSH TOOL with a solution of three parts cleaning solvent and one part light oil after each 40 hours of operation. After flushing, apply a small amount of Spindle Oil in air inlet and run free for one minute to insure proper lubrication.
GEARING should be grease lubricated to a minimum of once a month.
REQUIREMENTS
CAUTION: An excessive amount of lubricant in a tool will affect the speed and power, “2200” gearing should contain approx. l/4 ounce of grease and “44” gearing should contain approx. l/2 ounce of grease (per set of plane- tary gearing).
RECOMMENDED HOSE SIZE - 3/8” nominal inside diameter.
RECOMMENDED LUBRICANTS: Spindle Oil (29665), 1qt. (.9 liter) container for oiler and air inlet; Grease 33153, 5 lb. (2.3 kg) can for gears and bearings; “O” Ring Lubricant 36460, 4 oz. (113 g) tube for lubrication and installation of “0” Rings: Grease
MODEL
MAINTENANCE
DISCONNECT AIR SUPPLY from tool or shut off air supply and exhaust (drain) line of compressed air BEFORE performing maintenance or service to tool.
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. When removing or installing bearings, apply pressure to the bearing race that will be the press fit to the mating part; if this is not practiced, Brinelling of the bearing racesmay occur making replacement necessary. 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 solvent, blown dry with air and inspected for wear levels, abuse and contamination.
Double sealed or shielded bearings should never be placed
in solvent unless a good method of
BEFORE REASSEMBLING, lubricate parts where required. Use 33 153 Grease, or equivalent, in bearings. Use 36460 Lubricant for “0” Ring Assembly. When assembling “0” rings or parts adjacent “0” rings, care must be exercised to prevent damage to the rubber sealing surfaces. A small amount of grease will usually hold steel balls and other small parts in place while assembling.
WHEN ORDERING PARTS, be sure to list PART NUMBER, PART NAME, MODEL NUMBER AND SERIAL NUMBER OF TOOL. USE ONLY GENUINE ARO REPLACEMENT PARTS.
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