Universal Tool UT8961, Operator Instructions

Page: 2 / 4

Operating
Select the correct screwdriver bit or fastener driver to suit the screw or
fastener to be tightened or loosened.
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. Hold the clutch carrier or insert a 1/4 hex Allen key into the
work anvil (57) and with a spanner rotate torque ring (72) until it just
touches regulation washer (71). 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 torque ring (72) 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 torque ring (72) is rotated too far along the clutch anvil (57) 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
torque ring (72) 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.
To dismantle the angle head first unscrew 4 screws (84) and loosen the
angle lock nut (82) and turn clockwise and pull the angle assembly out.
Grip the tool in a vice fitted with soft jaws on the flats at the rear end of
the centre housing (25). Take off soft cover (80).
Remove torque cover (75) take off bit slide (60) torque ring (72)
regulation washer (71) and needle pins (70) Unscrew clutch housing
(69) left hand thread and remove anvil bushing (67) washer (66) torque
spring (65) spring (59) and slide base (60) When removing anvil (57)
take care not to lose ball (58).
Take off snap ring (64) and remove ball race (63) ball (51) end clutch
(61) centre clutch (55) ball (56) rear clutch (53) pilot pin (52) ball (51)
and retainer (50).
Take off C ring (54) and remove ball bearing (26) From the centre
housing remove.
third gear cage (23-C) and take off third plant gear (23-B) and third main
gear (23-A) then second main gear (21) then remove first gear cage
(20) and take off first plant gear (19) and first main gear (18) then
remove internal gear (24 & 24-1) and C ring (15).
Take off suspension ring (87) and coloured ring (88) unscrew housing
nipple (86) and air inlet bushing (49) remove second silencer (44)
spring (43) valve ball (42) O-ring (41) exhaust deflector (29) first silencer
(28-1) operating rod (32) and O-ring (27).
Remove set screw (4) and take off switch (5) Unscrew end housing (1)
and remove O-ring (2) and valve (3) Pull out air motor from centre
housing (25) tap end of rotor (16) and remove front plate (13) take out
roll pin (8) and remove end plate (7) Remove from end plate (7) roll pins
(9) and bearing (6) Take out rotor (16) from cylinder (10) and remove
rotor blades (12).
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
(7) & (13) that abut cylinder (10) 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 centre housing (25)
first make sure that the motor assembly is clamped tightly together and
that the rotor spins freely, slide the motor assembly into the centre
housing (25) ensuring that roll pin (8) locates in the motor assembly and
in the hole in the bottom of the main bore of centre housing (25)
situated between the two main ports.
Reset the clutch as required and /or 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.