Universal Tool UT8955 User manual

Manufacturer/Supplier Product Type RPM
Cycles Per Min
Tel No Fax No(01494) 883300 (01494) 883237
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 (5ml) of a suitable pneumatic motor lubricating
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
operator 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
operator must also be aware that when loosening fasteners, the tool
can move quite
quickly away from the
fastener being un-
done. An allowance
must be made for this
rearward movement
to avoid hand entrap-
ment. The operator
must also make al-
lowance that if the tool
does turn in the hand,
the hand is not
trapped against any
rigid object.
No
Air Pressure
Recommended Working 6.3 bar 90 PSI
Recommended Minimum n/a bar n/a PSI
Maximum 7bar 100 PSI
Personal Safety Equipment
Use - Safety Glasses
Yes
Use - Safety Gloves
Use - Safety Boots
Use - Breathing Masks
Use - Ear Protectors
Page No 1
Straight Reversible
Screwdriver
UT8955
3/8 10 30 10
1600
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
2.42
1.1
Noise Level Sound Pressure Level 83.0 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
11.8 Metres / Sec²

Operating
Select the correct screwdriver bit or fastener driver to suit the screw
or fastener to be tightened or loosened. Slide back the sleeve (74) and
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, first remove the clutch housing - left hand thread and pull out
the clutch assembly being careful not to lose guide pin and spring
(32) and (31). Hold the clutch carrier or insert a 1/4 hex Allen key into
work spindle (84) and with a spanner rotate adjustment nut (77) until
it just touches sleeve bearing (76). This is the clutch set at its lowest
output level. Reassemble the tool, try it on the joint to be fastened. If
more torque is required to place the fastener repeat the process but
rotate the adjustment nut (77) until there is a gap between it and the
sleeve bearing proceeding at approximately one turn of the nut at a
time until the correct tightness is achieved. If too high a setting is
reached rotate the adjustment nut back a part of a turn at a time.
If the adjustment nut (77) is rotated too far along the clutch spindle
(84) it is possible that the clutch will not slip and a reaction torque
against the hands will be felt. In this situation, 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 tool, when the stall torque position has been reached, can still be
used to set or loosen fasteners, provided the operator is aware of the
need to resist the torque reaction of the tool. Further adjustment of
adjusting nut (77) at this point will not increase the output of the tool.
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 on the flats at the rear end
of motor housing (1) and unscrew clutch housing (75) - left hand
thread and take out the clutch assembly being careful not to lose
guide pin (32) and guide pin spring (31). Grip the clutch and with a
sharp pointed needle tool prise out retaining ring (71) and take off
washer (72), ball retaining spring (73) and ball retainer (74) being
careful not to lose bit retaining ball (83). Again with a sharp pointed
tool, remove a second retaining ring (71) and pull off spacer (76).
Unscrew adjusting nut (77) and pull off spring seat (78), clutch spring
(79) and thrust washer (80). Remove from vice and tap the front end
to remove 4 off balls (81). Remove wiper (87) and then remove snap
ring (85) and separate clutch jaw (82) from work spindle (84).
Remove a third retaining ring (71) and pull off dog (86) from work
spindle (22).
Unscrew lock ring (29) from motor housing (1). Grip the lock ring and
push out the internal assembly and separate bearing (35), seal plate
(33), internal gear (18), 3 off idler gears (20) complete with 3 off idler
gear bushes (21) and work spindle (22). Idler gear bushes may be
pressed out of idler gears (20) but do not remove 3 off idler gear pins
(19) from work spindle (22).
Grip the end of rotor (26) and pull out the complete motor assembly.
Remove pin (28), motor gasket (44) and take off retainer ring (38).
Grip the spacer (27) and with a non metallic or soft metal (lead or
aluminium) hammer tap the splined end of the rotor (26) to drive it
through bearing (34) and end plate (23). Remove cylinder (24) and
take out 5 off rotor blades (25) from rotor (26). Support the rear end
plate (23) and tap the rotor (26) through the rear plate (23) and
bearing (34).
Pull the sides of hanger (42) apart to remove it from its retaining holes.
Drive out roll pin (40) and remove lever (2). Unscrew bushing (10)
complete with screen (11) and carefully prise out, with a sharp needle
pointed tool, deflector stop ring (8). Pull out deflector (7) and prise out
O-ring (9) from deflector (7). Remove 2 off screws (30) and pull off
housing cap (12), muffler (41) and housing gasket (13).
Unscrew valve screw (39) and remove O-ring (36), reverse valve
retainer (15), spring (16), plastic valve (4) and pin (3). Drive out pin
(45) to remove reverse valve bush (6), reverse valve (5), spring (14)
and push out valve bushing (17) if a replacement is required.
Reassembly
Clean all components and examine for wear. Look in particular for
wear and cuts on O-rings, wear on rotor blades, gear and clutch
components.
Coat all parts with a pneumatic tool lubricating 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
plates (23) that abut cylinder (24) are flat and free from burrs. If
necessary lap on a flat very fine grade of abrasive paper. Reassemble
in the reverse order.
When refitting the complete motor assembly to the motor housing (1)
first make sure that the motor assembly is clamped tightly together
and that the rotor spins freely, slide the motor assembly, with gasket
into the motor housing (1) ensuring that motor pin (28) locates in the
motor assembly and in the hole in the bottom of the main bore of
motor housing (1) situated between the two main ports.
Reset the clutch as required and/or set the correct air pressure.
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.

UT8955
Page No 3
Straight Reversible Screwdriver
Mar 98 Ver 1.1
Ref No Part No Description
1900191 Motor Housing
2900192 Throttle Lever
3900193 Valve Pin
4900668 Valve
5900194 Reverse Valve
6900195 Reverse Valve Bush
7729702 Deflector
8729703 Deflector Stop Ring
91012371 O-Ring
10 900196 Bushing
11 1005726 Screen
12 900197 Housing Cap
13 900198 Housing Gasket
14 900199 Reverse Spring
15 900200 Reverse Retainer
16 729063 Valve Spring
17 900201 Valve Bushing
18 732078 Internal Gear
19 900202 Idler Gear Pin (3)
20 732079 Idler Gear (3)
21 900203 Idler Gear Bush (3)
22 900204 Work Spindle
23 900102 End Plate (2)
24 900104 Liner
25 729709 Rotor Blade (5)
26 900103 Rotor
27 900101 Spacer
28 900105 Liner Pin
29 900205 Lock Ring
30 900206 Screw (2)
Ref No Part No Description
31 900207 Guide Pin Spring
32 730272 Guide Pin
33 720231 Seal Plate
34 729012 Ball Bearing (2)
35 732081 Ball Bearing
36 729088 O-Ring
38 732069 Retainer Ring
39 900208 Valve Screw
40 729167 Roll Pin
41 900209 Muffler
42 900210 Hanger
44 900113 Motor Gasket
45 731930 Roll Pin
71 730257 Retainer Ring (3)
72 730258 Washer
73 730259 Ball Ret. Spring
74 730260 Ball Retainer
75 900355 Clutch Case
76 730262 Sleeve Bearing
77 730263 Adjust Nut
78 730264 Spring Seat
79 730265 Clutch Spring
80 730266 Thrust Washer
81 1005080 Steel Ball (1/4") (4)
82 730267 Clutch Jaw
83 1005164 Steel Ball (1/8")
84 730268 Work Spindle (B)
85 730269 Snap Ring
86 730270 Dog
87 730281 Wiper

Distributor
Notes
Page No 4
Accessories
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.
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 UT8955, Straight Reversible 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.