Read these instructions carefully before installing, operating, servicing or repairing this tool. Keep these instructions in an accessible place
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<:cns "saf-gen-e" 1> SAFETY INFORMATION Read these instructions carefully before installing, operating, servicing or repairing this tool. Keep these instructions in an accessible place. Safety Messages <:v "<:cs "B&I">Snap-on <:/cs>Tools Company" 1> provides safety messages to cover reasonable situations that may be encountered when operating, servicing or repairing air tools. It is the responsibility of operators and servicing technicians to be knowledgeable about the procedures, tools and materials used, and to satisfy themselves that the procedures, tools and materials will not compromise their safety, that of others in the work place or the tool. Power Tool Safety Messages <:iaf 2> WARNING <:iaf 3> Improper use of power tools and accessories can cause broken tools. " 1>Read instructions before operating power tools. " 1>Be sure these instructions accompany the tool when passed from one user to a new or inexperienced user. " 1>Do not remove any labels. Replace all damaged labels. Broken tools can cause injury. <:iaf 4> Power tools can cause flying particles during use. Wear safety goggles, user and bystanders. Flying particles can cause injury. <:iaf 5> Power tools generate noise. Wear hearing protection, user and bystanders. Prolonged exposure to noise can cause hearing loss. <:iaf 6> Power tools vibrate. Avoid prolonged exposure to vibration. Prolonged exposure to vibration can cause injury. <:/cns><:cns "saf-gen-e" 1><:iaf 1><:/cns><:cns "saf-gen-e" 1> WARNING <:iaf 7> Risk of entanglement. " 1>Keep body parts away from rotating parts. " 1>Do not wear loose clothing and jewelry while operating tool. " 1>Wear protective hair covering to contain long hair. " 1>Do not carry the tool with your finger on the trigger. " 1>Do not lock, tape, wire, etc., the trigger in the ON position. " 1>Keep handle dry, clean and free from oil and grease. " 1>Always shut off air supply and disconnect tool from air supply when changing accessories. Entanglement can cause injury. <:iaf 8> Flammable vapors can explode. " 1>Do not use near flammable vapors or near a gas line or gas tank. " 1>Direct tool exhaust air away from flames or hot surfaces. " 1>Do not lubricate tools with flammable or volatile liquids such as kerosene, diesel or jet fuel. Explosion and flames can cause injury. <:iaf 9> Electricity can cause electric shock. Do not use on live electrical circuits. Electric shock can cause injury. <:/cns><:cns "saf-gen-e" 1><:iaf 10><:/cns><:cns "saf-gen-e" 1> WARNING Lubricating oil is discharged with exhaust air. " 1>Operate tool in a well ventilated area. " 1>Avoid breathing exhaust air. Breathing air with oil mist can cause injury. <:/cns><:cns "saf-gen-e" 1><:iaf 11><:/cns><:cns "saf-gen-e" 1> WARNING Work area can contain hazards. " 1>Keep work area clean and well lit. " 1>Stay alert and use common sense when operating tool. Do not operate when fatigued. " 1>Before using the tool, make sure that a shutoff device has been fitted on the supply line and the location is well-known and easily accessible so the air supply to the tool can be shut off in an emergency. " 1>Never lay a tool down until the attachment has stopped moving. " 1>Do not overreach. Keep proper footing and balance at all times. " 1>Do not allow bystanders to contact tool. " 1>When operating in heights, be aware of things below and around you. " 1>When tool is not in use, shut off the air supply and press trigger or lever to relieve air pressure. If tool is not to be used for a period of time, lubricate it, disconnect it from the air supply line and store it in a dry place with moderate temperature. " 1>Store tools when not being used in a high, dry and locked area that can not be accessed by children. Work area hazards can cause injury. <:/cns><:cns "saf-gen-e" 1><:iaf 12><:/cns><:cns "saf-gen-e" 1> WARNING Risk of whipping compressed air hoses. " 1>Attach air lines securely. " 1>Check the air hose and fittings regularly for wear. " 1>Do not connect quick-connect couplings directly to the tool. Whipping compressed air hose can cause injury. <:/cns><:cns "saf-gen-e" 1><:iaf 16><:/cns><:cns "saf-gen-e" 1> WARNING Untrained users can create hazards. " 1>Secure work with a clamp or a vise whenever possible. " 1>Use the right tool. Do not use a tool that is too light or too heavy for the work. " 1>Do not force tool. " 1>Operate air tools at 90 psig (6.2 bar, 620 kPa) maximum air pressure. " 1>It is expected that users adopt safe working practices and observe all local, regional or country legal requirements when installing, using or maintaining this tool. Improper use can cause injury. <:/cns><:cns "saf-gen-e" 1><:iaf 17><:/cns><:cns "saf-gen-e" 1> WARNING Improper repairs or lack of maintenance can create hazards. " 1>Do not modify or make temporary repairs. Use only approved spare parts for maintenance and repair. Servicing and repairs should be performed only by trained personnel. " 1>Do not use the tool if it vibrates too much, makes unusual noises, has loose parts, or shows any other sign of damage. " 1>If tool malfunctions, discontinue use and immediately arrange for service and repair. If it is not practical to remove the tool from service, shut off the tool air supply, write a warning tag and attach the tag to the tool. " 1>Do not remove any manufacturer fitted safety devices (e.g., wheel guards, safety trigger, speed governors). Improper parts, repair or maintenance can cause injury. <:/cns> Air Ratchet Safety <:fc 1><:cns "saf-gen-e" 1><:iaf 13><:/cns><:/fc> WARNING Sudden changes in motion or position can occur while using the tool. " 1>Anticipate and be alert for changes in motion during start up and operation. " 1>Maintain a secure grip. " 1>Anticipate reaction force. Adjust your stance and hold the tool securely. Sudden changes in motion or position can cause injury. <:fc 1><:cns "saf-gen-e" 1><:iaf 14><:/cns><:/fc> WARNING Using damaged and incorrect sockets or accessories can cause flying particles. " 1>Do not use chipped, cracked or damaged sockets or accessories. " 1>Use only power or impact sockets and accessories. " 1>Use only ball-joint flexible sockets. Do not use square block type flex sockets. " 1>When using extensions, hold air ratchet so that socket fits straight on the fastener. Flying particles can cause injury. <:cns "Safety" 2>SAVE THESE INSTRUCTIONS <:/cns> Specifications Square Drive Size FAR720<:t>3/8<:t> FAR750<:t>1/2" Torque Range Working<:t>5–65 ft. lb. (6.8–88.1 N•m) FAR720 Manual<:t>135 ft. lb. (183 N•m) FAR750 Manual<:t>135 ft. lb. (183 N•m) Working Air Pressure FAR720<:t>90 psig max (6.2 bar, 620 kPa max) Air Consumption, Free Speed FAR720<:t>3.8 cfm (27 SCFM) FAR750<:t>3.8 cfm (27 SCFM) Free Running Speed FAR720<:t>225 RPM min Air Inlet Thread Size FAR720<:t>1/4"-18 NPT Air Supply Hose Size FAR720<:t>3/8" ID min (9.5 mm ID min) Air Supply Hose Length FAR720<:t>30' max (9.14 m max) Length FAR720<:t>12.13" (308.1 mm) Weight FAR720<:t>3.0 lbs (1.36 kg) Sound Pressure Level* FAR720<:t>94.0 dBa loaded Sound Power Level* FAR720<:t>106.0 dBa loaded Vibration Level** FAR720<:t>8.2 meters/sec<:fc 2>2<:/fc> * Tested in accordance with ISO Standard 3744 and Pneurop test code PN8NTC1 with tool loaded per ISO Standard 8662. ** Tested in accordance with ISO Standard 8662-7. Application The <:v "<:cs "B&I">Snap-on<:/cs>" 2> FAR720/FAR750 Air Ratchet is a rugged, variable speed, reversible air ratchet. Its trigger-controlled power/speed regulator provides a torque range that starts at about 5 ft. lb. and goes up to at least 65 ft. lb. (88.1 N•m) at the recommended air pressure of 90 psig (620 kPa). Speed control provides low speed for starting fasteners and high speed for running them in. These features make the FAR720/FAR750 Air Ratchet ideal for automotive (and industrial) fastener removal and installation work. <:cns "saf-gen-e" 3> Air Supply The air ratchet operates best on clean, moisture-free, well-lubricated air at a constant pressure of 90 psig (6.2 bar, 620 kPa,) maximum. : Air Supply <:iaf 15> –<:t>" 3>Receiver Tank, Minimum 40 Gallon –<:t>" 4>Compressor, Sufficient Capacity –<:t>" 5>Drain, Daily –<:t>" 6>Pipe and Fittings, Minimum 1/2" –<:t>" 7>Top Air Intake –<:t>" 8>Shut Off Valve, Easily Reached –<:t>" 9>Filter –<:t>" 10>Air Regulator, Set at Working Pressure –<:t>" 11>Lubricator –<:t>" 12>Air Tool Connection –<:t>" 13>Low Spot, Water Trap –<:t>" 14>Drain, Daily <:/cns>Piping System The piping system should be large enough to avoid an excessive pressure drop under maximum flow conditions. All pipe fittings and hose outlets should be 1/2" and should be arranged so there are no low spots that collect water which cannot be drained daily. Do not use an air hose less than 3/8" ID or one that is too long because pressure drop under maximum flow conditions could reduce performance. " 15>Accessories are available for air tight connections. The quick coupler, <:v "<:cs "B&I">Snap-on<:/cs>" 2> part number AHC21, and adaptor, <:v "<:cs "B&I">Snap-on<:/cs>" 2> part number AHC21M, are recommended for use with this air ratchet. Air Compressor The air compressor should have sufficient capacity to deliver 3.8 cfm (27 SCFM) at 90 psig (6,2 bar, <:hr>620 kPa) at each outlet while the tool is running. The receiver tank should have sufficient capacity to provide surge balance for each air tool. Filter The <:v "<:cs "B&I">Snap-on<:/cs>" 2> AHR424 Filter, or equivalent, should be used to assure clean air for the ratchet. Water, dirt and scale act as abrasives which could damage the air ratchet. A filter unit should be installed between the compressor and the air regulator and air lubricator. Air Regulator Regulated air pressure is necessary for proper performance of the air ratchet. The <:v "<:cs "B&I">Snap-on<:/cs>" 2> AHR426 Regulator, or equivalent, will adjust and maintain the recommended air pressure of <:fc 3>90 psig (6.2 bar, <:hr>620 kPa)<:/fc>. Pressure less than this reduces efficiency, while pressure greater than this increases speed beyond the rated capacity—creating potential hazards and possible damage to the air ratchet. Check the air pressure at the air inlet while using the ratchet in a normal manner. Air Line Lubricator " 15>Do not use a heavy grade of oil because stalling and low performance will result. The preferred method of lubricating the air ratchet motor is to use an air line lubricator such as the <:hr><:v "<:cs "B&I">Snap-on<:/cs>" 2> AHR428 Lubricator. It should be filled with <:v "<:cs "B&I">Snap-on<:/cs>" 2> IM6 Air Motor Oil or a good grade of <:hr><:v "SAE 10W" 3> oil. If an air line lubricator is not used, lubricate the air motor by injecting approximately 1/8 oz (3.75 ml) of IM6 Air Motor Oil into the air inlet of the wrench each day before using it. IM6 Oil is specially formulated for air tools and no flushing solvent is needed. Ratchet Mechanism Lubrication Grease the ratchet mechanism daily. Using a grease gun, <:v "<:cs "B&I">Snap-on<:/cs>" 2> part number YA4190FAR, or similar type grease gun, inject grease through the flush-type fitting on the selector knob until fresh grease becomes visible on both sides of the ratchet head. Use a grease such as air ratchet grease, <:v "<:cs "B&I">Snap-on<:/cs>" 2> part number ME18A15, or an equivalent type. " 15><:t>The grease gun, <:v "<:cs "B&I">Snap-on<:/cs>" 2> part number YA4190FAR, includes YA4190CAP and YA4190DIS. Attaching Air Supply Before connecting the air ratchet to the air hose, always blow out the air line and hose to remove any dirt or moisture that may have collected. Attach the air hose to the air inlet bushing. Air Strainer A filter screen is assembled into the air ratchet inlet bushing. It can be serviced by removing the inlet assembly and cleaning the screen. During assembly, tighten the air inlet bushing to 140–160 in. lb. <:hr>(16–18 N•m). If the O-ring is damaged, install a new O-ring to prevent air leakage. Trigger-Regulator Valve A trigger controls the air flow valve, which regulates the power and speed of the ratchet. The button provides for variable low speed control with feathering ability and progressive, high speed control for high torque requirements. The distance of trigger movement directly controls the amount of air flow to the air motor. Reverse Mechanism The direction of rotation is determined by the position of the selector knob in the drive body. Be sure the selector knob is positioned fully in either direction before depressing the trigger. Turning the selector knob to the left turns the nut or bolt in a clockwise direction. Torque Mechanism The FAR720/FAR750 Air Ratchet releases at about <:hr>65 ft. lb. (88.1 N•m). This is a high torque tool; be careful not to overtorque fasteners. The ratchet can be used manually, with the trigger fully released, like any hand ratchet. Maximum hand torque is 135 ft. lb. (183 N•m). This allows a fastener to be tightened down by hand with less than maximum torque. Sockets The FAR720 uses 3/8" square drive sockets. The FAR750 uses 1/2" square drive sockets. Because of their torque capacity, be sure that only power or impact sockets are used. <:cns "saf-gen-e" 1>Service Instructions " 15>Parts referred to in the following sections are followed by numbers keyed to <:xr "Figure 2:" 1> and its associated parts listing. <:/cns> Maintenance If the tool is not to be used for a period of time, follow these procedures for proper storage. " 16>Inject grease through the flush-type fitting in the selector knob (FAR720 (<:xr "17" 2>), FAR750 (<:xr "37" 3>)) until fresh grease is visible on both sides of the ratchet head. " 17>Disconnect the air supply. " 18>Inject 6 to 7 drops of IM6 Air Motor Oil into the air inlet. " 19>Reconnect the air supply and, covering the exhaust outlet to avoid spraying an air oil mist into the air, run the tool for 30 seconds. " 20>Store the tool in a dry place with moderate temperature. Disassembly Jacket and Trigger Cover " 16>To remove the jacket (<:xr "1" 4>) from the handle (<:xr "2" 5>), place the tool on a bench with the serial number pad facing up and away from you. Be sure the inlet bushing and air line coupler are threaded into the rear of the tool. " 17>Using an appropriate tool, insert the tool between the front of the serial number pad and the front of the slot in the jacket (<:xr "1" 4>). " 18>Push the tool downward until it contacts the aluminum housing. Push on the tool and pivot the tool slightly toward the trigger cover (<:xr "3" 6>), creating a ramp for the jacket (<:xr "1" 4>) to slide over. Hold the tool in an angled position, so that the handle is vertical, with the air inlet coupler contacting the bench. " 19>Depress the trigger cover (<:xr "3" 6>) and push down on the jacket (<:xr "1" 4>) until the front of the jacket slides over the serial number pad. " 20>Remove the tool and slide the jacket (<:xr "1" 4>) off the handle (<:xr "2" 5>). " 21>Remove the trigger cover (<:xr "3" 6>). Air Valve and Trigger Components " 16>Insert handle in a vise fitted with soft jaws. " 17>If necessary, remove adaptor from inlet bushing. " 18>If used, remove washer (<:xr "4c" 7>) and exhaust deflector (<:xr "4b" 8>). " 19>Using a 3/4" wrench, unscrew inlet bushing (<:xr "4" 9>) with filter. " 20>If necessary, remove O-ring (<:xr "5" 10>) from inlet bushing (<:xr "4" 9>) and replace O-ring (<:xr "5" 11>). " 21>Tip the rear of the tool downward and remove the spring (<:xr "6" 12>) and trigger valve (<:xr "7" 13>). " 22>Remove the trigger (<:xr "9" 14>). Use an appropriate tool to remove the valve seat (<:xr "8" 15>). Drivebody Assembly and Drive Line Components FAR720 " 15>The parts removed in the following steps (1 through 6) are part of the disc brake kit (<:xr "10" 16>). Note orientation of all parts before disassembling. " 16>Remove the retaining ring (<:xr "11" 17>) from ratchet housing assembly. " 17>Remove disc spring (<:xr "12" 18>) and bushing (<:xr "13" 19>). Remove wear washer (<:xr "14" 20>). " 18>Set selector knob (<:xr "17" 21>) midway between forward and reverse. " 19>Grip the square drive on drivebody assembly (<:xr "15" 22>) and pull drivebody (<:xr "16" 23>), selector knob (<:xr "17" 21>) and attached parts out of ratchet housing. " 20>Tap the square drive of drivebody (<:xr "16" 23>) on a flat surface until two pawl pins (<:xr "18" 24>) pop out. Remove two pawl pins (<:xr "18" 24>) and two pawls (<:xr "19" 25>). Also remove two pawl stop pins (<:xr "20" 26>). " 21>Remove two plungers (<:xr "21" 27>) and two pawl springs (<:xr "22" 28>) from selector knob (<:xr "17" 29>). Remove selector knob (<:xr "17" 29>). " 22>Remove ratchet head (<:xr "26" 30>) and attached parts from ratchet housing assembly (<:xr "23" 31>). " 23><:t>Note orientation of cylindrical bar element (<:xr "27" 32>) in ratchet head (<:xr "26" 33>) and remove cylindrical bar element (<:xr "27" 32>). " 23>Remove drive shaft (<:xr "28" 34>) from ratchet housing assembly (<:xr "23" 31>). " 24>Remove wear ring (<:xr "25" 35>) from ratchet housing (<:xr "23" 31>). " 25>Examine all parts for damage or wear. Also examine ratchet housing assembly (<:xr "23" 31>) and needle bearings (<:xr "24" 36>) inside ratchet housing for damage. Replace worn parts with parts obtained from the manufacturer or an authorized representative. FAR750 " 16>Support the selector knob on a flat surface. Compress the groove washer (<:xr "30" 37>) on the square drive side of the drivebody assembly (<:xr "34" 38>). Use a 3/32” diameter punch to remove the spring pin (<:xr "35" 39>). " 17>Noting orientation, remove the groove washer (<:xr "30" 37>) and disc springs (<:xr "31" 40>). " 18>Remove wear washer (<:xr "32" 41>). " 19>Set selector knob (<:xr "37" 42>) midway between forward and reverse. " 20>Grip the square drive on drivebody assembly (<:xr "34" 38>) and push drivebody (<:xr "36" 43>), selector knob (<:xr "37" 42>) and attached parts out of ratchet housing subassembly (<:xr "43" 44>). " 21>Tap the square drive of drivebody (<:xr "36" 43>) on a flat surface until two pawl pins (<:xr "38" 45>) pop out. Remove two pawl pins (<:xr "38" 45>) and two pawls (<:xr "39" 46>). Also remove two pawl stop pins (<:xr "40" 47>). " 22>Remove two plungers (<:xr "41" 48>) and two pawl springs (<:xr "42" 49>) from selector knob (<:xr "37" 42>). Remove selector knob. " 24>Remove ratchet head (<:xr "26" 30>) and attached parts from ratchet housing subassembly (<:xr "43" 44>). Noting orientation of cylindrical bar element (<:xr "27" 50>) in ratchet head, remove cylindrical bar element (<:xr "27" 50>) and drive shaft (<:xr "28" 51>) from ratchet housing assembly (<:xr "43" 44>). " 25>Remove wear washer (<:xr "32" 41>). " 26>Examine all parts for damage or wear. Also examine ratchet housing subassembly (<:xr "43" 44>) and needle bearings inside ratchet housing for damage. Replace worn parts with parts obtained from the manufacturer or an authorized representative. Drive Gear Components " 16>Hold tool upright with the trigger facing you. Place the handle and attached parts in a soft-jawed vise. Position tool so that vise jaw pressure occurs on the handle, below the trigger cover pocket. " 17>Using a 1-7/8" wrench, loosen clamp nut (<:xr "44" 52>) and remove. " 18>Remove ratchet housing assembly (<:xr "23" 53>) or ratchet housing subassembly (<:xr "43" 44>). " 19>Remove gear carrier (<:xr "45" 54>) with internal gear (<:xr "46" 55>) from handle (<:xr "2" 56>), then remove gear carrier (<:xr "45" 54>) from internal gear. " 20>Remove three planetary gears (<:xr "48" 57>) and three gear pins (<:xr "47" 58>) from gear carrier (<:xr "45" 54>). " 21>Remove air motor subassembly (<:xr "49" 59>) from handle (<:xr "2" 56>). Air Motor Components " 16>Remove front end plate (<:xr "51" 60>) with front ball bearing (<:xr "50" 61>) from rotor (<:xr "52" 62>). Disassemble if necessary. " 17>Noting orientation, remove cylinder liner (<:xr "53" 63>) from rotor (<:xr "52" 62>). If necessary, remove roll pin (<:xr "54" 64>) from cylinder liner (<:xr "53" 65>). " 18>Remove four vanes (<:xr "55" 66>) and vane springs (<:xr "56" 67>) from rotor (<:xr "52" 62>). " 19>If damaged, remove rotor shaft O-ring (<:xr "57" 68>) from rotor (<:xr "52" 62>). " 20>Do not remove rear ball bearing (<:xr "59" 69>) and rear end plate (<:xr "58" 70>) from rotor (<:xr "52" 62>) unless disassembly is necessary. " 21>Remove handle (<:xr "2" 71>) from the soft-jawed vise. Inspection and Service " 16>Clean all parts and examine for wear, nicks, or gouges. " 17>Examine gears and splines for broken teeth. " 18>Examine bearings for wear or damage. " 15>If air motor subassembly ball bearings (<:xr "50" 61>, <:xr "59" 69>) need to be driven out, support end plates (<:xr "51" 60>, <:xr "58" 70>) on a piece of metal tube close to the maximum diameter of end plates. Remove the plug (59) from the rear end plate (<:xr "58" 70>) and use a suitable punch to drive out ball bearings from end plates. " 19>Replace worn parts with parts obtained from the manufacturer or authorized representative. Assembly Air Motor Components " 16>If the rear ball bearing (<:xr "59" 69>) was removed: " 23>Press the rear ball bearing (<:xr "59" 69>) into the bearing bore of rear end plate (<:xr "58" 70>) by pressing on outer race of the bearing. Be sure that the bearing is fully seated against the bottom of the bore. " 23>Support the inner race of the rear ball bearing (<:xr "59" 69>) and press the rotor shaft into the bearing. The gap between the rotor (<:xr "52" 62>) and the rear end plate (<:xr "58" 70>) is 0.0015/0.0020 in. " 23>Replace the plug (<:xr "60" 72>) and position flush with rear end plate (<:xr "58" 70>). " 17>If removed, install rotor shaft O-ring (<:xr "57" 68>) in the groove behind the splined shaft of rotor (<:xr "52" 62>). " 18>Install four vane springs (<:xr "56" 67>) in holes in slots of rotor (<:xr "52" 62>) and install four lightly oiled vanes (<:xr "55" 66>) in rotor. " 19>Install roll pin (<:xr "54" 64>) in cylinder liner (<:xr "53" 63>). Compress vanes (<:xr "55" 66>) and slide cylinder liner (<:xr "53" 65>) into place over rotor (<:xr "52" 62>), aligning spring pin (<:xr "35" 73>) with hole in rear end plate (<:xr "58" 70>). " 20>Install front ball bearing (<:xr "50" 61>) and front end plate (<:xr "51" 60>) on rotor (<:xr "52" 62>), with the bearing toward the splined shaft of rotor. Add 6 to 7 drops of air motor oil in the air inlet hole in the rear end plate. Gear Components " 16>Apply a light coat of grease, <:v "<:cs "B&I">Snap-on<:/cs>" 2> part number YA4190DIS, to the three gear pins (<:xr "47" 58>) and teeth of the three planetary gears (<:xr "48" 57>) and internal gear (<:xr "46" 55>). Insert gear pins into planetary gears, and install gear pins and planetary gears into the gear carrier (<:xr "45" 54>). " 17>Insert the gear carrier (<:xr "45" 54>) and attached parts into the internal gear (<:xr "46" 55>). " 18>Install air motor subassembly (<:xr "49" 59>) in the handle (<:xr "2" 56>), aligning the air motor exhaust slots with the exhaust ports in the handle. " 19>Align the teeth of the planetary gears (<:xr "48" 57>) with the splined rotor shaft and install the gear components in handle (<:xr "2" 56>). Make sure spline in gear carrier (<:xr "45" 74>) turns. " 20>Install ratchet housing assembly (<:xr "23" 53>) or ratchet housing subassembly (<:xr "43" 44>) in handle (<:xr "2" 56>). " 21>Apply serviceable <:v "<:cs "B&I">Loctite<:/cs>" 4> to threads on handle (<:xr "2" 56>). With threaded end of clamp nut (<:xr "44" 52>) toward the handle, slide the clamp nut over the holes in the ratchet housing (<:xr "23" 31>) or (<:xr "43" 44>) used to carry the drivebody assembly. " 23>FAR720: Align the larger hole in ratchet housing with the trigger hole in the handle and hand tighten the clamp nut. " 23>FAR750: Align either hole in ratchet housing with the trigger hole in the handle and hand tighten the clamp nut. " 22>Hold tool upright with the trigger facing you. Place the handle and attached parts in a soft-jawed vise. Position tool so that vise jaw pressure occurs on the handle, below the trigger cover pocket. " 24>Maintaining alignment of the holes in the ratchet housing (<:xr "23" 31>) or (<:xr "43" 44>) with the trigger hole, use a 1-7/8” wrench to tighten clamp nut (<:xr "44" 52>) to 45–50 ft. lb. (61–68 N•m). Drivebody Assembly and Drive Line Components " 16>Apply grease to spline of drive shaft (<:xr "28" 34>) and insert drive shaft, spline end first, into ratchet housing (<:xr "23" 31>) or (<:xr "43" 44>) so that crank pin on drive shaft is halfway between the two halves of ratchet housing. " 17>Apply grease to inside and outside of the cylindrical bar element (<:xr "27" 32>). " 18>Position the cylindrical bar element (<:xr "27" 32>) so that the hole in the cylindrical bar element points out and slide the flats of the cylindrical bar element between the flats of the ratchet head (<:xr "26" 33>). " 19>Insert ratchet head (<:xr "26" 33>) and cylindrical bar element (<:xr "27" 32>) into ratchet housing (<:xr "23" 31>) or (<:xr "43" 75>), inserting hole in cylindrical bar element over crank pin on drive shaft (<:xr "28" 76>). FAR720 " 16>Insert selector knob (<:xr "17" 77>) into drivebody (<:xr "16" 78>). " 17>Install two pawl springs (<:xr "22" 79>) and two plungers (<:xr "21" 80>) in selector knob (<:xr "17" 77>). " 18>Install two pawl stop pins (<:xr "20" 81>), two pawls (<:xr "19" 82>), and two pawl pins (<:xr "18" 83>) in drivebody (<:xr "16" 78>). Make sure that pawl pins are flush with the bottom of the drivebody. " 19>Thoroughly grease all drive body components. " 20>Grease both sides of wear ring (<:xr "25" 84>) and install in ratchet housing (<:xr "23" 85>). Be sure that the wear ring (<:xr "25" 84>) is fully seated against the bottom of the ratchet housing. " 21>Set selector knob (<:xr "17" 2>) midway between forward and reverse. " 22>Grip the square drive on drivebody assembly (<:xr "15" 86>) and work the selector knob (<:xr "17" 77>), drivebody (<:xr "16" 78>) and attached parts into ratchet housing assembly (<:xr "23" 87>) until seated against the wear washer in the ratchet housing. " 15>The parts installed in step 8 are part of the disc brake kit (<:xr "10" 88>). " 24>Over square drive on drivebody assembly (<:xr "15" 86>), insert: " 23>Wear washer (<:xr "14" 89>), with tab up, " 23>Bushing (<:xr "13" 90>), with notch and collar up, " 23>Disc spring (<:xr "12" 91>) with bevel facing drivebody assembly, and " 23>Retaining ring (<:xr "11" 92>) in ratchet housing assembly, using ring installation tool SPP751. FAR750 " 16>Insert selector knob (<:xr "37" 3>) into drivebody (<:xr "36" 93>). " 17>Install two pawl springs (<:xr "42" 94>) and two plungers (<:xr "41" 95>) in selector knob (<:xr "37" 3>). " 18>Install two pawl stop pins (<:xr "40" 96>), two pawls (<:xr "39" 97>), and two pawl pins (<:xr "38" 98>) in drivebody (<:xr "36" 93>). Make sure that pawl pins (<:xr "38" 98>) are flush with the bottom of the drivebody (<:xr "36" 93>). " 19>Thoroughly grease all drive body components. " 20>Install wear washer (<:xr "32" 99>) into ratchet housing assembly (<:xr "43" 75>) on trigger side. Apply a light coat of grease, <:v "<:cs "B&I">Snap-on<:/cs>" 2> part number YA4190DIS, to both sides of wear washer. " 21>Set selector knob (<:xr "37" 3>) midway between forward and reverse. " 22>Insert drivebody assembly (<:xr "34" 100>) and work the selector knob (<:xr "37" 3>), drivebody (<:xr "36" 93>) and attached parts into ratchet housing subassembly (<:xr "43" 75>) until seated against wear washer (<:xr "32" 99>). " 24>Over square drive on drivebody assembly (<:xr "34" 100>), insert: " 23>Wear washer (<:xr "32" 99>), " 23>Disc springs (<:xr "31" 101>) with bevel facing each other and " 23>Groove washer (<:xr "30" 102>). " 25>Support the selector knob (<:xr "37" 3>) on a flat surface. " 26>Compress the groove washer (<:xr "30" 102>) on the square drive side of the drivebody assembly (<:xr "34" 100>) and install the spring pin (<:xr "35" 73>) in the drivebody assembly. Air Valve and Trigger Components " 16>If removed, install inlet O-ring (<:xr "5" 103>) on inlet bushing (<:xr "4" 104>). " 17>Install valve seat (<:xr "8" 105>) in handle (<:xr "2" 71>). When installing a new valve seat, be sure valve seat is pressed firmly in the bottom of the handle air inlet bore. " 15>If the trigger valve (<:xr "7" 106>) leaks air when the trigger (<:xr "9" 107>) is not depressed, the valve seat (<:xr "8" 105>) and trigger valve (<:xr "7" 106>) must be replaced. " 18>Install the trigger (<:xr "9" 107>) in handle (<:xr "2" 108>). " 19>Use a trigger valve installation tool to install the trigger valve (<:xr "7" 109>). " 15>Use a 6" x 1/8" diameter rod as an installation tool. Push a 3/4" piece of long soft plastic tubing with 1/8" inside diameter approximately 1/2" onto one end of the rod. " 20>Place the plastic tube end of the installation tool over the diameter opposite the steel shaft of the trigger valve (<:xr "7" 109>). To reinstall the trigger valve, hold the tool with the rear of the tool facing up. " 23>Check that the hole in the trigger (<:xr "9" 110>) is aligned with the open end of the handle. " 23>Insert the trigger valve (<:xr "7" 109>) into the hole in the trigger (<:xr "9" 110>). " 23>Pull on the trigger (<:xr "9" 107>) to hold the trigger valve (<:xr "7" 106>) in place and remove the trigger valve installation tool. " 21>Depress the trigger (<:xr "9" 110>) slightly to center the trigger valve (<:xr "7" 106>) then install the spring (<:xr "6" 111>), small end first, over the plastic diameter of the trigger valve. " 22>Using 3/4" wrench, install inlet bushing (<:xr "4" 112>) with filter and tighten to 140–160 in lb (16–18 N•m). " 24>If using, place exhaust deflector (<:xr "4b" 113>) over inlet bushing (<:xr "4" 112>). If exhaust deflector is loose, use the washer (<:xr "4c" 114>) to secure. " 15>Do not discard washer (<:xr "4c" 114>) if it is not used. If the adaptor ever needs replacing, the washer may be required. " 25>Press and release the trigger (<:xr "9" 107>) to be sure it is functioning properly. Trigger Cover and Jacket " 16>Install the trigger cover (<:xr "3" 115>) on the handle (<:xr "2" 108>). " 17>Holding the trigger cover in place, align the open areas of the jacket (<:xr "1" 116>) with the serial number pad. " 18>Slide jacket (<:xr "1" 116>) over handle (<:xr "2" 108>) until serial number pad interlocks with hole in jacket. <:crmk 1>FAR720/FAR750 Air Ratchet <:iaf 18> Ref Description |
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