Universal Air Tools UT8171 User Manual

Operator Instructions
Includes - Foreseen Use, Work Stations, Putting Into Service, Operating, Dismantling, Assembly and Safety Rules
Important
Read these instructions carefully before installing, operating, servicing or repairing this tool. Keep these instructions in a safe accessible place.
Manufacturer/Supplier Product Type
Universal Air Tool Company Limited Unit 8 Lane End Industrial Park High Wycombe Bucks
½ Square Drive Pistol Grip Impact Wrench
Model No/Nos Serial No
UT8171
HP14 3BY
Tel No Fax No(01494) 883300 (01494) 883237
6,800
Cycles Per Min
Product Nett Weight
4.18
1.90
lbs Kg
Recommended Use Of
Balancer Or Support
No
Air Pressure Recommended Working Recommended Minimum Maximum
6.3 n/a
7.0
bar bar bar
90
n/a
100
Personal Safety Equipment
Use - Safety Glasses
Yes
Use - Safety Gloves Use - Safety Boots Use - Breathing Masks Use - Ear Protectors
Yes
Foreseen Use Of Tool
The impact wrench is designed for the tightening and loosening of threaded fasteners within the range as specified by the manufacturer. It should only be used in conjunction with suitable impact type 1/2" square female drive nut running sockets. Only use sockets which are of the impact type. It is allowed to use suitable extension bars, universal joints and socket adaptors between the square output drive of the impact wrench and the square female drive of the socket. Do not use the tool for any other purpose than that specified without consulting the manufacturer or the manufacturer's authorised supplier. To do so may be dangerous. Never use an impact wrench as a hammer to dislodge or straighten cross threaded fasteners. Never attempt to modify the tool for other uses and never modify the tool for even its recommended use as a nutrunner.
Work Stations
The tool should only be used as a handheld hand operated tool. It is always recommended that the tool is used when standing on the solid floor. It can be in oth­er positions but before any such use, the opera­tor must be in a secure position having a firm grip and footing and be aware that when loos­ening fasteners the tool can move quite quickly away from the fastener being undone. An al­lowance must always be made for this rear­ward movement so as to avoid the possibility of hand/arm/body entrapment.
Recommended Hose Bore
Recommended Max.
Size - Minimum
Ins M/M Ft M
3/8 10 30 10
Noise Level Sound Pressure Level 83.0 dB(A)
PSI
Test Method Tested in accordance with Pneurop
PSI
test code PN8NTC1 and ISO Standard 3744
PSI
Vibration Level
Sound Power Level 93.0 dB(A)
3.0 Metres / Sec²
Test Method Tested in accordance with ISO standards 8662 Parts 1 & 7
Putting Into Service
Air Supply
Use a clean lubricated air supply that will give a measured air pressure at the tool of 90 p.s.i./6.3 bar when the tool is running with the trigger fully depressed and the air regulator in its maximum opening flow position. Use recommended hose size and length. It is recommended that the tool is connected to the air supply as shown in figure 1. Do not connect a quick connect coupling directly to the tool but use a whip or leader hose of say approximately 12 inches length. Do not connect the tool to the air line system without incorporating an easy to reach and operate air shut off valve. The air supply should be lubricated. It is strongly recommended that an air filter, regulator, lubricator (FRL) is used as shown in Figure 1 as this will supply clean, lubricated air at the correct pressure to the tool. Details of such equipment can be obtained from your supplier. If such equipment is not used then the tool should be lubricated by shutting off the air supply to the tool, depressurising the line by pressing the trigger on the tool. Disconnect the air line and pour into the hose adaptor a teaspoonful (5ml) of a suitable pneumatic motor lubricating oil preferably incorporating a rust inhibitor. Reconnect tool to
Hose Length
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air supply and run tool slowly for a few seconds to allow air to circulate the oil. If tool is used frequently lubricate on daily basis and if tool starts to slow or lose power. It is recommended that the air pressure at the tool whilst the tool is running is 90 p.s.i./6.3 bar. The tool can run at lower and higher pressures with the maximum permitted working air pressure of 100 p.s.i./7.0 bar. For a lower air pressure the tool will give a lower output for a given setting of the air regulator set for 90 psi operation and an increased output for higher pressures. Hence it is possible that changes in supply pressure can give situations where the fastener is under or over tightened. For changes in pressure, the regulator position and application should be reassessed. It is recommended that joint tightness of the threaded fastener assembly be checked with suitable measuring equipment.
Operating
The output of the impact wrench in prime working condition is governed by mainly three factors a) the input air pressure b) the time the impact wrench is operated on the joint. Normal time for joints of average tension requirement 3 to 5 seconds It is strongly recommended that an external pressure regulator ideally as part of a filter/regulator/lubricator (FRL) is used to control air inlet pressure so that the pressure can be set to help control the tension required to be applied to the threaded fastener joint. There is no consistent reliable torque adjustment on an impact wrench of this type. However, the air inlet pressure in conjunction with the three position regulator lever (22) can be used to adjust torque to the approximate tightness of a known threaded joint. To set the tool to the desired torque, select a nut or screw of known tightness of the same size, thread pitch and thread condition as those on the job. Turn air regulator to a set position, apply wrench to nut and gradually increase power (by increasing air pressure) until nut moves slightly in the direction it was originally set. The tool is now set to duplicate that tightness, note regulator setting for future use. When tightening nuts not requiring critical torque values, run nut up flush and then tighten an additional one-quarter to one-half turn (slight additional turning is necessary if gaskets are being clamped) . For additional power needed on disassembly work, turn regulator to position 3 and increase air inlet pressure if required. This impact wrench is rated a 1/2" bolt size. Rating must be down graded for spring U bolts, tie bolts, long cap screws, double depth nuts, badly rusted conditions and spring fasteners as they absorb much of the impact power. When possible, clamp or wedge the bolt to prevent spring back. Soak rusted nuts in penetrating oil and break rust seal before removing with impact wrench. If nut does not start to move in three to five seconds use a larger size impact wrench. Do not use impact wrench beyond rated capacity as this will drastically reduce tool life. Note: Actual torque on a fastener is directly related to joint hardness, tool speed, condition of socket and the time the tool is allowed to impact. Use the simplest possible tool-to-socket hook up. Every connection absorbs energy and reduces power.
Dismantling & Assembly Instructions
Disconnect from air supply. Remove oil plug (39) and drain the oil contained within the front
end of the tool into a suitable receptacle. Grip motor housing (38) in a vice fitted with soft jaws and unscrew 4 off screws (26) pull off clutch housing (38). Hook out oil seal (40) and gasket (27) from clutch housing (38). Grip hammer cage (28) and pull off the hammer mechanism assembly. Take off anvil spacer (35) and from hammer cage (28) pull out anvil (33) with compression spring (32) and thrust button (30). Push out 2 off hammer pins (31) from hammer cage (28) to release 2 off hammers (29) and carefully note how the two hammers (29) are located to hammer cage (28) by hammer pins (31) for reassembly. If replacements are required remove o-ring (36) and socket retaining ring (37). Take off end cap (21) and air regulator reverse valve assembly. Unscrew 3 cap screws (16)
and remove the rear plate (15) and pick out bearing (9). Re­move c-ring (17) from reversing regulator (19). With a soft hammer tap the end of rotor (14) to drive the motor assembly out of motor housing (1). Take off cylinder (12) and take out 6 off rotor blades (13) from rotor (14). Unscrew hose adapter (6) and remove exhaust deflector (7) and take out spring (4) and valve stem (3).
Reassembly
Clean all components and examine for wear and cracks etc. particularly parts of the hammer assembly, particularly anvil (33), around the area of the square drive. Examine rotor blades for wear and o-rings and seals for cuts and wear. Replace all parts with parts from the manufacturer or approved supplier. Make sure the rear plate (15) that abut cylinder (12) are flat and free from burrs. If necessary, lap faces on a flat very fine grade of abrasive paper. Lightly coat all parts with suitable pneumatic tool lubricating oil and reassemble in the reverse order. On completing assembly make sure all parts are locked tight and the anvil will rotate and the trigger and regulator reverse valve operate freely. Remove oil plug (39) and pour into the front end 5/8 fluid oz (15cc) of standard SAE20 grade oil. Do not overfill as this cause reduction in power. With the throttle trigger depressed pour into the hose adapter (6) 5 ml of suitable pneumatic tool lubricating oil and release throttle trigger. Connect to suitable air supply and run tool slowly for 2 to 3 seconds to allow the oil to circulate. Reset tool for operation. Refer to section ­Operating.
Safety Rules When Using an Impact Wrench
1) Read all the instructions before using this tool. All operators must be fully trained in its use and aware of these safety rules. All service and repair must be carried out by trained personnel.
2)The socket used must be of the correct drive size and the "impact" type. Never use sockets other than impact type.
3) Do not use sockets with excessive wear to the input and output drives. Check that the square on any other type of drive or the impact wrench is not cracked or excessively worn before fitting or changing socket, extension, etc. Make sure that the socket is firmly fixed to the tool.
4) Always ensure that a stable position or footing is adopted before using the tool.
5) Ensure that the tool has been correctly set up on a test joint. Incorrect set up could cause joint breakage with sudden and unexpected movement of the tool.
6) Use only correct spare parts for repair.
7) Always ensure that the reverse valve is in the correct position before operating the tool. Do not run the tool unless the socket is first located on the joint.
8) Check hose and fittings regularly for wear. Use quick connect couplings only as recommended. See "Putting into Service". Do not carry the tool by the hose and ensure that the hand is away from the on/off valve when carrying.
9) Do not attempt to hold or guide the socket by hand when the tool is running.
10) Do not exceed maximum recommended air pressure.
11) Use safety equipment as recommended.
12) The tool is not electrically insulated. Do not use where there is a possibility of coming into contact with live electricity.
13) Preferably shut off the air supply before changing sockets or at least ensure that the hands are well clear of the operating trigger.
14) Take care against entanglement of moving parts of the tool with clothing, ties, hair, cleaning rags, etc.
15) When loosening fasteners first ensure that there is sufficient clearance behind the tool to avoid hand entrapment. The tool will move away from the threaded joint as the nut/bolt etc. is loosened and rides up the thread moving the tool with it.
16) Only use extensions, adaptors and universal joints suitable for use with impact wrenches.
17) If the tool appears to malfunction remove from use immediately and arrange for service and repair.
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