Page 1
Operator Instructions
W
T
Includes - Foreseen Use, Work Stations, Putting Into Service,
Operating, Dismantling, Assembly and Safety Rules
Important
Read these instructions carefully before insta lling, 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
3/8 Pistol Grip Impact
rench (Steel Case)
Model No/Nos Serial No
High Wycombe
Bucks
UT8055RB
HP14 3BY
Tel No Fax No
(01494) 883300 (01494) 883237
RPM
8,500
Cycles Per Min
Product Nett Weight
3.74
1.7
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
Perso n a l Sa fe t y E q ui pm en t
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 threade d fas ten er s w ithin the ra nge as spe cifie d by the
manufacturer. It should only be used in conjunction with suitable
impact type 3/8" 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
with out co nsul ti ng th e ma nufa ctur er or th e man uf act urer 's
authorised supplier. To do so may be dangerous.
Never u se an impact wre nch as a ha mmer to dislodge or
straighte n cross threaded fas teners. Never a ttempt 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
recomme n ded tha t th e tool is us ed 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 tha t
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
3/8 10 30 10
Ins M/M Ft M
Noise Level
PSI
Test Method
PSI
test code PN8NTC1 and ISO Standard 3744
PSI
Vibration Level
Test Method
Sound Pressure Level 87.8 dB(A)
Sound Power Level 99.43 dB(A)
Tested in accordance with Pneurop
3.0
ested 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 depresse d and the air regu lator 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 sys tem withou t incorporating an easy to reach a nd
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
Hose Length
Metres / Sec²
Page No 1
Page 2
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 air supply and run tool slowly for a
few sec onds 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. When lubricating, also ensure that screen in hose
adaptor (15) is clean.
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 p si o perat io n and an i ncrea sed o utp ut fo r hig her
pressures. Hence it is possible that changes in supply pressure
can gi ve si tuat io ns wher e the fast ener i s und er o r o ver
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
c) the setting of the air regulator for a given joint a t a given
pressure operated for a given time.
The air regulator item (19) can be used to regulate the output of
the impact wrench if no other control means is available. 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 ten sion requ ired to be applied to the th readed
fastener joint.
There is no consistent reliable torque adjustment on an impact
wrench of this type. However, the air regulator 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 low position,
apply wrench to nut and gradually increase power (turn regulator
to admit more air) until nut moves slightly in the direction it was
originally se t. The tool is now s et to duplicate tha t 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
its fully open position. This impact wrench is rated a 3/8" bolt
size. Rating must be down graded for spring U bolts, tie bolts,
long cap sc rews, double depth nuts, badly ruste d conditions
and spring fasteners as they absorb much of the impact power.
When possible, clamp or wedge the bolt to prevent springback.
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 and Assembly Instructions
Disconnect tool from the air supply.
Remove oil plug (2) with o-ring (7) and drain the oil contained in
the front end into a suitable container. Grip motor housing (1) in
a vice fitted with soft jaws and unscrew hose adaptor (15) and
remove exhaust deflector (14), valve s pring (13), valve ste m
Page No 2
(12), support rubber (11) and power silencer (10). Remove 4 off
screws with washers (33) and pull off steel housing (44)
assembly. Remove o-ring (47) and press out oil seal (46) and
anvil bushing (45) from housing (44). Lift out anvil (40) with anvil
spacer (41). Rubber ring (42) and socket ring (43) may be prised
off of anvil (40). Pull out remainder of hammer assembly and
separate into items hammer cage (34), cam ball pilot (35), cam
ball (36), hammer cam (37), 2 off hammer pins (38) and cam
release spring (39).
Remove 2 off springs (9) and pull out the c omplete trigger
assembly. Note that at this time how the groove in the end of
the trigger stem (3) has to locate around the end of the valve
stem (12). Rem ove ‘E’-ring (7) and pull trigger (3) ou t of the
throttle bushing (6). Remove stop cover (4). Remove o-rings (5)
from the throttle bushing.
Remove a further 4 off screws (33) from the rear end and prise
off end cap (17) with gasket (16) and air regulator reverse valve
(19), spring (20) and steel ball (21). Prise off ‘C’-ring (22) and
o-ring (18) from air regulator reve rse (19) and push out air
regulator reverse (19) from end cap (17) being careful not to
lose stop pin (21) and spring (20) which may spring out as air
regulator reverse is removed. Carefully tap the splined end of
rotor (25) to drive out the complete motor assembly from the
rear end of motor housing (1). Remove motor guide pin (28) and
pull rear end plate (24) ass embly and front en d plate (32)
assembly from rotor (25). Remove cylinder (27) and 6 off rotor
blades from rotor (25).Tap out ball bearing (23) from rear end
plate (24) and remove o-ring (31) and tap out ball bearing (29)
and oil seal (30) from front end plate (32).
Reassembly
Clean all parts and examine for wear, cracks etc. and replace
parts as necessary. Look in particular for wear and cuts on
o-seals and o-rings and for we ar and cracks on rotor blades
(26), hammer cage (34), cam ball pilot (35), hammer cam (37)
2 off hammer pins (38) and anvil (40) particularly in the area of
the square drive. Make sure that the faces of end plates (24) and
(32) that abut cylinder (27) are flat and free from burrs and
surface defects and if necessary lap faces on a flat find abrasive
surface. Use only manufacturer or distributor supplied
repl acement p arts. L ightly coat al l part s with a suitabl e
pneumatic tool lubricating oil and assemble in the reverse order.
On completing assembly ensure that all parts are locked tight
and that the anvil (40) is free to rotate and the trigger and
revers e/air regulator me chanisms opera te freely. Remove oil
plug (2) and o-ring (7) and pour into the front end 3/8 fluid oz.
(12cc) of a standard SAE20 oil. Replace oil plug and o-ring. Do
not overfill with oil as this could reduce the power of the tool.
With trigger (3) depressed, pour into hose adaptor (15) 5ml (1
teaspoonful) of a suitable pneumatic tool lubricating oil. Release
trigger and connect to a suitable air supply and run tool slowly
for 2 to 3 seconds to allow the oil to circulate and set tool for
the operation required - see 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
Page 3
UT8055RB 3/8" Square Drive Pistol Grip Impact Wrench (Steel Case)
Ref No Part No Description
1 70078 4 Motor Ho usi ng
2 72973 9 Oil Pl ug
3 700669 Throttle Trigger Pin
4 700492 Stop Cover
5 729091 O-Ring (2)
6 700785 Throttle Bushing
7 700736 E-Ring
9 70007 7 Screw (2)
10 700583 Power Silencer
11 700564 Support Rubber
12 700361 Valve Stem
13 700362 Valve Spring
14 700565 Exhaust Deflector
15 700064 Hose Adaptor
16 700566 Gasket
17 700835 End Cap
18 700072 O-Ring
19 700311B Air Reverse Regulator
20 700312 Spring
21 729902 Stop Pin
22 700074 C-Ring
23 1005062 Ball Bearing
24 700568 Rear Plate
25 700569 Rotor
26 700570 Rotor Blade (6)
27 700571 Cylinder
Ref No Part No Description
28 730032 Guide Pin
29 700572 Ball Bearing
30 700573 Oil Seal
31 729109 O-Ring
32 700575 Front Plate
33 728462A Screw c/w Washer (8)
34 700576 Hammer Cage
35 700577 Can Ball Pilot
36 700578 Cam Ball
37 700579 Hammer Cam
38 700580 Hammer Pin (2)
39 573032 Cam Release Spring
40 700581 Anvil (Standard)
41 700582 Anvil Spacer
42 729480 Rubber Ring
43 729788 Socket Ring
44
45 573026 Anvil Bushing
46 729883 Oil Seal
47 700585 O-Ring
48 700586 Rubber Grip
700787 Steel Housing - Chome
700788 Steel Housing - Black
Jan 2002 Ver 1.0
Page No 3
Page 4
Declaration of Conformity
Universal Air Tool Company Limited
Unit 8, Lane End Industrial Park, High Wycombe, Bucks, HP14 3BY, England
declare under our sole responsibility that the product
Models UT8055RB Impact Wrench, Serial Number
to which this declaration relates is in conformity with the following standard(s) or other normative document(s)
EN792 (Draft), EN292 Parts 1 & 2, ISO 8662 Parts 1 & 7, Pneurop PN8NTC1
following the provisions of
89/392/EEC as amended by 91/368/EEC & 93/44/EEC Directives
Lane End D.H.Moppett (Man. Director)
Place and date of issue Name and signature or equivalent marking of authorised person
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.
Accessories
Technical Specifi cation
Clutch Type Pin
Overall Length 159 mm (6.26")
Width 57 mm (2.24")
Air Consumption
Running Free
Air Consumption On Load
Maximum Torque (5 secs)
Air Inlet 1/4-18 NPTF
Drive Size 3/8" Square
3.5 cfm Average
25 scfm Continuous
1.9 cfm Average
14 scfm Continuous
130 ft lbs (17.9 Kgfm) (176
Nm)
Notes
Distributor
This document may not be copied wholly or in part by anyone without the consent of the Directors of Universal Air Tool Company Limited
Designed & Written in the U.K.
©Copyright of Universal Air Tool Company Limited, established in the United Kingdom, 1994
Page No 4
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