Universal Tool UT8957 Specifications

Manufacturer/Supplier Product Type
RPM
Cycles Per Min
Tel No
Fax No
[phone]
[phone]
Model No/Nos Serial No
Product Nett Weight Recommended Use Of
Balancer Or Support
Recommended Hose Bore
Size - Minimum
Recommended Max.
Hose Length
Ins M/M Ft M
Foreseen Use
These screwdrivers are designed for the tightening and loosening of
threaded fasteners within the range as specified by the manufacturer.
They should only be used in conjunction with 1/4" male hex shank
screwdriver bits and fastener drivers.
Do not use the tool for any other purpose than that specified without
consulting the manufacturer or his authorised representative.
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. 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 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 intake bushing a teaspoonful
Work Stations
The tool should only be used as a hand held, hand operated tool. It is
always recommended that the tool is used when standing on a solid
floor. It can be used in other positions, but before any such use the oper-
ator must be in a secure position having a firm grip and footing. The
operator must adopt a firm grip sufficient to resist the torque reaction of
the tool, i.e. the tool will try
to turn in the hand. The op-
erator must also be aware
that when loosening fasten-
ers, the tool can move quite
quickly away from the fas-
tener being undone. An al-
lowance must be made for
this rearward movement to
avoid hand entrapment.
The operator must also
make allowance that if the
tool does turn in the hand,
the hand is not trapped
against any rigid object.
No
Page No 1
Pistol Push Start-Auto
Shut Off Screwdriver
UT8957
3/8 10 30 10
1,400
Includes - Foreseen Use, Work Stations, Putting Into Service, Operating,
Dismantling, Assembly and Safety Rules
Operator Instructions Important
Read these instructions carefully before installing, operating,
servicing or repairing this tool. Keep these instructions in a safe
accessible place.
Universal Air Tool Company Limited
Unit 8
Lane End Industrial Park
High Wycombe
Bucks
HP14 3BY
lbs
Kg
2.09
0.95
Noise Level Sound Pressure Level 72.0 dB(A)
Test Method Tested in accordance with Pneurop
test code PN8NTC1 and ISO Standard 3744
Vibration Level
Test Method Tested in accordance with ISO
standards 8662 Parts1 & 7
Less than 2.5
Metres / Sec²
Personal Safety Equipment
Use - Safety Glasses
Yes
Use - Safety Gloves
Use - Safety Boots
Use - Breathing Masks
Use - Ear Protectors
Air Pressure
Recommended Working
6.3
bar
90
PSI
Recommended Minimum
n/a
bar
n/a
PSI
Maximum
7.0
bar
100
PSI

Operating
Select the correct screwdriver bit or fastener driver to suit the screw or
fastener to be tightened or loosened. Insert appropriate drive bit.
This model has an adjustable clutch so that the torque applied to the
fastener can be adjusted to give the required tightness within the torque
range of the tool. To set the tool to give a particular torque output, turn
the torque ring (55) to the right to increase the torque output or to the
left to decrease the torque output. This screwdriver has a push to start
system which eliminates the use of a throttle lever; the air motor will
automatically stop when the screwdriver reaches the pre-set torque
If the fastener is not sufficiently tightened or cannot be loosened then
the tool in adjustable clutch mode has insufficient capacity. Select a
more powerful tool.
The person setting up the tool must be aware of this torque reaction at
high setting levels of the clutch and that the tool will try to turn against
the hand. All that is required is a firm grip.
The only thing that will affect the output is a change in the air supply
pressure. The output can be increased up to the use of the maximum
allowed supply pressure and decreased with a reduction in supply
pressure until the tool fails to operate.
It must also be understood that even if the clutch is set to slip it may not
do so if the supply air pressure falls below the pressure at which the
clutch was set. It is therefore strongly recommended that a pressure
control valve is used. Information as to suitable equipment can be
obtained from your supplier.
When using the tool keep the screwdriver bit pressed firmly into the
screw head to avoid cam out and screw head damage.
Dismantling & Assembly Instructions
Disconnect from air supply.
Grip the tool in a vice fitted with soft jaws Take off rear housing (61).
Remove C ring (59) take off bit slide sleeve (58) spring (57) torque ring
(55) regulation washer (54) and needle pins (53) Unscrew clutch
housing (52) left hand thread and remove anvil bushing (51) washer
(50) torque spring (49) spring (47) and slide base (48) When removing
anvil (45) take care not to lose ball (46).
Take off C ring (38) and remove ball race (43) end clutch (41) centre
clutch (39) ball (40) rear clutch (37) pilot pin (36) ball (35) and retainer
(34).
Take off front housing (32) then remove internal gear (31) remove
second gear cage (30) and take off second plant gear (29) and second
main gear (28) then remove first gear cage (27) and take off first plant
gear (26) and first main gear (28) and connector (24) Pull out air motor
from pistol housing (1) tap end of rotor and remove front plate (22) and
remove bearing (23) take off cylinder (18) and remove rotor blades (21)
then tap off end plate (17) and remove bearing (16) Pull out valve (12)
and valve o-ring (11) To remove the valve assembly first take off button
(10) and remove lock pin (8) then pull out valve assembly ( 7-1, 7, 4, 5,
3, and 6) then unscrew the cap screw (67) and remove (66, 65, 64, 63
and the operating rod (62). Too remove the reverse switch take out set
screw (14) and pull off switch (15).
Removing the silencers:- unscrew second silencer (74) and pullout first
silencer (70).
Reassembly
Clean all components and examine for wear and tear. Look in particular
for wear and cuts on O-rings, wear on rotor blades, gears and clutch
components.
Coat all parts with pneumatic tool lubrication oil, one preferably
containing a rust inhibitor and grease all bearings, gears and clutch
parts with a molybdenum or lithium based general purpose grease.
Before reassembling the motor, make sure that the faces of end plate
(17) & (22) that abut cylinder (18) are flat and free from burs. If
necessary lap on a flat fine grade of abrasive paper. Reassemble in the
reverse order.
When refitting the complete motor assembly to the pistol housing (1)
first make sure that the motor assembly is clamped tightly together and
that the rotor spins freely. Reassemble in the reverse order, reset the
clutch as required and set the correct air pressure.
(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 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.
Page No 2
Safety Rules For A Screwdriver
1) Read all the instructions before using this tool. All operators must be
fully trained in its use and aware of these safety rules.
2) Do not exceed the maximum working air pressure.
3) Use personal safety equipment.
4) Use only compressed air at the recommended conditions.
5) If the tool appears to malfunction remove from use immediately and
arrange for service and repair.
6) If the tool is used with a balancer or other support device ensure that
it is fixed securely.
7) Always keep hands away from the working attachment fitted to the
tool.
8) The tool is not electrically insulated. Never use the tool if there is any
chance of it coming into contact with live electricity.
9) Always when using the tool adopt a firm footing and/or position and
grip the tool firmly to be able to counteract any forces or reaction forces
that may be generated whilst using the tool.
10) Use only correct spare parts. Do not improvise or make temporary
repairs.
11) Do not lock, tape, wire, etc. the on/off valve in the run position. The
trigger/lever etc. must always be free to return to the 'off' position when
it is released.
12) Always shut off the air supply to the tool, and depress the
trigger/lever etc. to exhaust air from the feed hose before fitting,
adjusting or removing the working attachment.
13) Check hose and fittings regularly for wear. Replace if necessary. Do
not carry the tool by its hose and ensure the hand is remote from the
on/off control when carrying the tool with the air supply connected.
14) Take care against entanglement of moving parts of the tool with
clothing, ties, hair, cleaning rags, etc. This will cause the body to be
drawn towards the tool and can be very dangerous.
15) It is expected that users will adopt safe working practices and
observe all relevant legal requirements when installing, using or
maintaining the tool.
16) Do not install the tool unless an easily accessible and easily operable
on/off valve is incorporated in the air supply.
17) Take care that the tool exhaust air does not cause a problem or
blows on another person.
18) Never lay a tool down unless the working attachment has stopped
moving.
19) Always ensure that the reverse button is in the selected position
before starting the tool.
20) Do not use bits or sockets with excessive wear to the input and
output drives. Make sure the bit, socket, extension is firmly fixed to the
tool.
21) 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 is loosened and rides up
the thread moving the tool with it.

UT8957
Page No 3
Pistol Push Start-Auto Shut Off Screwdriver
Sep 2007 Ver 1.20
Ref No Part No Description
1 5L2100 Pistol Housing
2 2C2003 Blank Cap
2-1 7Q2008 O-Ring
3 7Q2006 O-Ring (2)
4 7Q6112 Valve O-Ring
5 6S2023 Valve Pin
6 6N2106 Cone Spring
7 6S2024 Valve Bushing
7-1 7Q2009 O-Ring (2)
8 5L2101 Lock Pin
9 7S2106 Set Screw
10 5L2102 Button
10-1 6S2032 Lock Plate Screw
10-2 6S2025 Lock Plate
11 7Q2011 Valve O-Ring
12 2P6001 Valve
13 6N5006 Spring
14 7S2107 Set Screw
15 5L2103 Switch
16 7S5001 Ball Bearing
17 1S6001 End Plate
18 1P6005 Cylinder
19 2S2023 Key
20 1S6045 Rotor
21 1P6051 Blade (6)
22 1P6063 Front Plate
23 7S2002 Ball Bearing
24 1S3050 Connect
25 1P2270 First Main Gear
26 1P2110 First Plant Gear (4)
27 1P2280 First Gear Cage
28 1G6270 Second Main Gear
29 1P6110 Second Plant Gear (4)
30 1P6287 Second Gear Cage
31 1S2061 Internal Gear
32 5A6041 Front Housing
33 7S6003 Ball Bearing
34 2S6103 Retainer
Ref No Part No Description
35 7S2102 Ball (57)
36 3S5001 Pilot Pin
37 3S5211 Rear Clutch
38 6N2006 C Ring (2)
39 3S5217 Center Clutch
40 7S2112 Ball (2)
41 3S5221 End Clutch
43 3S5231 Ball Race
45 3S5021 Anvil (6.35Hex)
46 7S2105 Ball (2)
47 6N5110 Spring
48 3S2227 Slide Base
49 6N5001 Torque Spring
50 2S5120 Washer
51 2S2240 Anvil Bushing
52 3A5201 Clutch Housing
52-1 2Q2003 O Ring
53 6S2010 Needle Pin (3)
54 3S5101 Regulation Washer
55 3A6001 Torque Ring
56 7S3107 Ball
57 6N2110 Spring
58 5S2001 Bit Slide Sleeve
59 6N2001 C Ring
60 5A3212 Housing Cap
60-1 5A6501 Torque Cover(Black)
60-2 5A6502 Torque Cover(Blue)
60-3 5A6503 Torque Cover(Red)
60-4 5A6504 Torque Cover(Yellow)
60-5 5A6505 Torque Cover(Green)
61 5A6020 Rear Housing
62 6S2006 Operating Rod
64 6S2021 Valve Plate
65 6N2107 Cone Spring
66 2Q5001 O-Ring (3)
67 2S2011 Screw Cap (2)
70 2P3040 First Silencer
71 5L2104 Pistol Cover
73 2S2005 Air Inlet Bushing (Pt)
74 2P3041 Second Silencer

Distributor
Notes
Page No 4
Accessories
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
Model UT8957 Pistol Push Start-Auto Shut Off Screwdriver, 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
Place and date of issue Name and signature or equivalent marking of authorised person
Lane End D.H.Moppett (Man. Director)
This document may not be copied wholly or in part by anyone without the consent of the Directors of Universal Air Tool Company Limited
©Copyright of Universal Air Tool Company Limited, established in the United Kingdom, 1994
Designed & Written in the U.K.