ARO 50 SERIES Operator's Manual

50 SERIES POWER MOTOR Released: 8-1-89 Revised: 10-6-95 Form: 3507-2 Models 7744-l 0 and 7744-l 5 WARNING READ THIS MANUAL CAREFULLY BEFORE INSTALLING, OPERATING OR SERVICING THIS EQUIPMENT. FAILURE TO OBSERVE THE FOLLOWING WARNINGS COULD RESULT IN INJURY. Pneumatic tools should always be installed and used in accor- dance with A.N.S.I. B186.1 “Safety Code For Portable Air Tools.” 0 l l l l l l Operate this tool at 90 p.s.i.g. (6.2 bar) maximum air pressure at the air inlet of the tool. Disconnect air supply from tool before removing/installing bit, socket or device attached to tool or performing maintenance procedures. Keep hands, clothing and long hair away from rotating end of tool. Anticipate and be alert for sudden changes in motion during start up and operation of any power tool. Never exceed rated r.p.m. of tool. Wear suitable eye and hearing protection while operating tool. Tool shaft can continue to rotate briefly after throttle is re- leased. Do not lubricate tools with flammable orvolatile liquids such as kerosene, diesel or jet fuel. Do not remove any labels. Replace any damaged label. Use only accessories recommended by ARO. Repeated prolonged operator exposure to vibrations which may be generated in the use of certain hand-held tools may produce Raynaud’s phenomenon, commonly referred to as Whitefinger disease. The phenomenon produces numbness and burning sensations in the hand and may cause circulation and nerve dam- age as well as tissue necrosis. Repetitive users of hand-held tools who experience vibrations should closely monitor duration of use and their physical condition. l The use of other than genuine ARO replacement parts may result in safety hazards, decreased tool performance and in- creased maintenance and may invalidate all warranties. l ARO is not responsible for customer modification of tools for applications on which ARO was not consulted. l Tool maintenance and repair should be performed by autho- rized, trained, competent personnel. Consult your nearest ARO authorized servicenter. It is the responsibility of the employer to place the information in this manual into the hands of the operator. For parts and service information, contact your local ARO distributor, or the Customer Service Dept. of the Ingersoll-Rand Distribution Center, White House, TN at PH: (615) 672-0321, FAX: (615) 672-0801. ARO Tool Products Ingersoll-Rand Company 1725 U.S. No. 1 North • P.O. Box 8000 l Southern Pines, NC 2838843000 ©1995 THE ARO CORPORATION. PRINTED IN U.S.A. Part of worldwide Ingersoll-Rand

WARNING Wear eye protection when operating or performing maintenance on this tool. WARNING WARNING Turn off air supply and disconnect air supply hose before installing, removing or adjusting any accessory on this tool, or before performing any maintenance on this tool. Air powered tools can vibrate in use. Vibration, repetitive motions or uncomfortable positions may be harmful to your hands and arms. Stop using any tool if discomfort, tingling feeling or pain occurs. Seek medical advice before resuming use. WARNING Do not carry the tool by the hose. WARNING Do not overreach when operating this tool. Keep body stance balanced and firm. NOTICE This label must appear on the tool at all times. If it is lost or damaged, a re- placement label is avail- able at no cost. WARNING Read the manual before operating this tool. Operate at 90 psig/6.2 bar max. PN 46176-1 LABEL WARNING I Wear hearing protection when operating this tool. WARNING Do not use damaged, frayed or deteriorated air hoses and fittings. WARNING Operate at 90 p.s.i.g. (6.2 bar/620 kPa) maximum air pressure. WARNING = Hazards or unsafe practices which could result in severe personal injury, death or substantial property damage. CAUTION = Hazards or unsafe practices which could result in minor personal injury or product or property damage. NOTICE = Important installation, operation or maintenance information. 2

amount of lubrication will affect the perfor- mance and life of this tool. Use only recommended lubricants at below time intervals: EVERY 8 HOURS OF TOOL OPERATION - Fill lubricator reser- voir of recommended F.R.L. with spindle oil (29665). If an in line or air line lubricator is not used, apply several drops of spindle oil (29665) in air inlet. EVERY 160 HOURS OF TOOL OPERATION - Lubricate gear- ing. Pack bearings, coat shafts and lubricate gears with NLGI #1 “EP” grease (33153). Gearing should contain approximately 1/16 oz. (1.8 g) of grease. AIR SUPPLY REQUIREMENTS For maximum operating efficiency, the following air supply specifi- cations should be maintained to this air tool: l AIR PRESSURE - 90 p.s.i.g. (6.2 bar) l AIR FILTRATION - 50 micron l LUBRICATED AIR SUPPLY l HOSE SIZE - 5/16” (8 mm) I.D. An ARO@ model C28231-810 air line FILTER/REGULATOR/LU- BRICATOR (F.R.L.) is recommended to maintain the above air supply specifications. RECOMMENDED LUBRICANTS After disassembly is complete, all parts, except sealed or shielded bearings, should be washed with solvent. To relubricate parts, or for routine lubrication, use the following recommended lubricants: Where Used ARO Part # Description Air Motor 29665 1 qt Spindle Oil “0” Rings & Lip Seals 36460 4 oz. Stringy Lubricant Gears and Bearings 33153 5 lb. “EP” - NLGI #1 Grease INSPECTION, MAINTENANCE AND INSTALLATION Disconnect air supply from the tool or shut off air supply and ex- haust (drain) line of compressed air before performing mainte- nance or service to the tool. It is important that the tools be serviced and inspected at regular intervals for maintaining safe, trouble-free operation of the tool. Be sure the tool is receiving adequate lubrication, as failure to Iu- bricate can create hazardous operating conditions resulting from excessive wear. Tool maintenance and repair shall be performed by authorized, trained, competent personnel. Tools, hose and fittings shall be re- placed if unsuitable for safe operation and responsibility should be assigned to be sure that all tools requiring guards or other safe- ty devices shall be kept in legible condition. Maintenance and re- pair records should be maintained on all tools. Frequency of repair and the nature of the repairs can reveal unsafe application. Scheduled maintenance by competent authorized personnel should detect any mistreatment or abuse of the tool and worn parts. Corrective action should be taken before returning the tool for use. 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. Double sealed or shielded bearings should never be placed in solvent unless a good method of re-lubricating the bearing is available. Open bearings may be washed but should not be allowed to spin while being blown dry. Upon reassembling, lubricate parts where required. Use 33153 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 replacement parts are necessary, consult drawing contain- ing the part for identification. Always use clean, dry air. Dust, corrosive fumes and/or excessive moisture can damage the motor of an air tool. An air line filter can greatly increase the life of an air tool. The filter removes rust, scale, moisture and other debris from the air lines. Low air pres- sure (less than 90 p.s.i.g.) reduces the speed of the air tool. High air pressure (more than 90 p.s.i.g.) raises performance beyond the rated capacity of the tool and could cause injury. Shown below is a typical piping arrangement. MAIN LINES 3 TIMES AIR TOOL INLET SIZE SYSTEM TOOL LUBRICATOR AIR REGULATOR’ BRANCH LINE 2 TIME AIR TOOL INLET SIZE COMPRESSOR I DRAIN REGULARLY-- \ Be sure that the air supply lines and connectors are of proper size to provide a sufficient quantity of air to the tool. 3

29 28 36 26 29 28 MODEL 7744-15 11.76:1 RED. 1500 R.P.M. 1000 R.P.M. NOT SHOWN 46326 BAIL 46176-1 WARNING LABEL

....................... Spring .............................. Valve Rod Assembly ................. Housing Assembly ................... Spring .............................. Throttle Pin ......................... Roll Pin ............................. Lever .............................. Ball Bearing ......................... Rear End Plate ...................... Rotor ............................... Blade (5 req’d) ...................... Cylinder ............................ Front End Plate ...................... 20 21 22 23 24 26 27 29 30 31 32 34 35 36 Ball Bearing ......................... MOTOR ASSEMBLY (includes items 14 thru 20) “0” Ring ............................ Spacer ............................. Locating Pin ......................... Sun Gear 4.4:1 ratio (15 teeth) ......... Planet Gear (3 req’d) 4.4:l ratio (18 teeth) Needle Bearing (6 req’d) .............. Carrier Assembly 4.4:1 ratio ........... Sun Gear (1 or 2 req’d) 3.43:1 ratio (21 teeth) ... Planet Gear (3 or 6 req’d) 3.43:1 ratio (15 teeth) . Shaft (3 req’d) ....................... Spindle 3.4: 1 ratio ................... Ring Gear .......................... Spacer ............................. Ball Bearing ......................... Retaining Ring ...................... Carrier Assembly 3.43:1 ratio .......... Y65-13 48226-1 Y325-214 46412 47723-2 46466 46900 42315 46522 46465 46899 46459 47260-2 46467-l 46496 46243 38339 46521 DISASSEMBLY/ASSEMBLY INSTRUCTIONS I NOTlCE l Never apply excessive pressure by a holding device which may cause distortion of a part. l Apply pressure evenly to parts which have a press fit. l Apply even pressure to the bearing race that will be press fitted to the mating part. l Use correct tools and fixtures when servicing this tool. l Don’t damage “0” rings when servicing this tool. l Use only genuine ARO replacement parts for this tool. When ordering, specify part number, description, tool model number and serial number. GEARING DISASSEMBLY _ Using a wrench on flats of ring gear (32) and a strap wrench on housing (9) remove ring gear from tool. _ Remove retaining ring (35) from spindle. _ Remove spindles and gears from ring gear. NOTE: Keep gears grouped with mating spindle when disassembling. - Do not remove bearing (34) or spacer (33) unless damage is evident. _ To remove bearing (34) and spacer (33) from ring gear, press on spacer (33) from inside splined end of ring gear. - Do not remove gear (28) from carrier assembly unless dam- age is evident. Gear is press fit onto carrier assembly. GEARING ASSEMBLY _ Assemble spacer (33) into ring gear (32). - Lubricate bearing (34) with ARO 33153 grease and assemble into ring gear, pressing on outer race of bearing. _ Coat shafts of spindles with ARO 33153 grease. _ Assemble gears, containing bearings (26) to shafts of mating spindle. _ Assemble carrier assembly to spindle. _ Lubricate sets of gears liberally with ARO 33153 grease (approximately 1/32 oz. per reduction). _ Assemble spindles and gearing into ring gear. Rotate spindle and gears to align gear teeth with splines of ring gear. _ Thread ring gear to tool and tighten with wrench on flats. MOTOR DISASSEMBLY _ Remove gearing from tool. _ Remove spacer (22). _ Tap front edge of housing to remove motor assembly. Locat- ing pin (23) should also come out. Tap drive end of rotor (16) with a soft face hammer; motor will come apart. NOTE: Bearings are press fit on rotor. Remove end plate (15) and bearing (14) from rotor. MOTOR ASSEMBLY Lubricate bearing (14) with ARO 33153 grease and assemble to end plate (15) pressing on outer race of bearing. Assemble end plate (15) to rotor (16) pressing on inner race of bearing. Coat five rotor blades (17) with ARO 29665 spindle oil and as- semble to rotor slots - straight side out. Coat i.d. of cylinder (18) with ARO 29665 spindle oil and as- semble over rotor. NOTE: Air inlet slots in end of cylinder must be aligned with two air inlet holes in end plate (15). Assemble bearing (20) to end plate (19), pressing on outer race of bearing. Assemble end plate (19) to rotor, pressing on inner race of bearing. Be sure rotor turns without binding. Insert locating pin (23) into ,096” diameter blind hole at bottom of motor cavity in housing. Align notches of end plates and cylinder and install motor into housing, aligning notches with locating pin (23). Grease and assemble “0” ring (21) to end plate (19). Assemble spacer (22) to motor. THROTTLE DISASSEMBLY Clamp air inlet adapter (2) in a smooth face vise. Unthread housing (9) with a strap type wrench. Remove spacer (3) diffuser washer (4) exhaust cap (5) two fill- ers (6) spring (7) and valve rod (8). CAUTION: Do not remove or adjust rubber portion of valve rod (8) as it is preset at the factory. Remove throttle pin (11) and spring (10). Remove screen (1) from inlet adapter. THROTTLE ASSEMBLY Install spring (10) and throttle pin (11) into housing, aligning slot in throttle pin with air inlet holes in housing. Install valve rod assembly (8) into housing. NOTE: Throttle pin (11) should not pull out when throttle rod (8) is seated properly. Install two fillers (6) to exhaust cap (5). Install exhaust cap (5) to housing, aligning lever (13) with throttle pin (11). Assemble spring (7) into housing. Assemble diffuser washer (4) and spacer (3) to housing, se- curing with inlet adapter (2). Clean and replace screen (1) in inlet adapter. 5