Universal Air Tools UT5964 - Manual (Page 2)

Operating
Select the correct screwdriver bit or fastener driver to suit
the screw or fastener to be tightened or loosened. Slide
back the sleeve (4) and insert appropriate drive bit.
Model UT5964 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 (23) and (24).
Hold the clutch carrier or insert a 1/4 hex Allen key in cam
spindle (14) and with a spanner rotate adjustment nut (7)
until it just touches sleeve bearing (6). 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
(7) 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 (7) is rotated too far along the cam
spindle (14) 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 (7) 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.
Dismantling & Assembly Instructions
Disconnect tool from the air supply.
Grip the tool in a vice fitted with soft jaws on housing (36)
and unscrew (left hand thread) clutch housing (5) from internal
gear (22). Pull out clutch assembly being careful not to lose
spring guide (23) and spring (24). Grip the clutch assembly
and with a needle pointed tool prise out retaining ring (1)
and remove washer (2) spring (3) and ball retainer (4) being
careful not to lose screwdriver bit retaining ball (13). Again
with a needle pointed tool remove second retaining ring (1)
and pull off sleeve bearing (6). Unscrew adjusting nut (7)
and pull off washer (8), clutch spring (9) and washer (10).
Remove from vice and tap the front end to remove 4 off
balls (11). Remove retaining ring (15) and separate cam
spindle (14) from clutch carrier (12). Remove a third retaining
ring (1) and pull off drive dog (16).
Unscrew internal gear (22) from housing (36). Grip the internal
gear (22) and push out the internal gear assembly and
separate bearing (21), 3 off planet gears (26) and gear carrier
(25) with 3 off pins. Do not remove the 3 off pins. Drive
out pin (37). Drive out pin and unscrew set screw to be
able to pull off trigger (47) and remove valve spring (46).
Grip throttle valve (40) and pull out the complete valve
assembly. Separate reverse valve (43) with ball (44), O-ring
(42), reverse valve bushing (41), O-ring (39), throttle valve
(40) and O-ring (38). O-ring (39) may be taken off of throttle
valve (40). Unscrew air inlet (51) and remove two screws
(50) and take out exhaust diffuser (49). Carefully grip the
splined end of the rotor (29) and pull out the complete motor
assembly from housing (36). Remove pin (32). Remove
retaining ring (28P) and grip bearing case (28) and with a
non metallic or soft metal (lead or aluminium) hammer tap
the splined end of rotor (29) to drive it through bearing (27)
and bearing case (28). Remove cylinder (31) and 4 off rotor
blades (30) from rotor (29). Support the cylinder side face
of end plate (33) and tap the non splined end of the rotor
(29) to separate it from end plate (33) and bearing (34). Tap
out bearing (27) from bearing case (28).
Reassembly
Clean all components and examine for wear. Look in
particular for cuts on O-rings and wear on rotor blades and
clutch parts. Replace parts only with parts obtained from the
manufacturer or an authorised distributor. Coat all parts with
a pneumatic tool lubricating oil and grease all bearings, gears
and clutch parts with a molybdenum or lithium based general
purpose grease and reassemble in the reverse order. Before
reassembling make sure that the faces of end plates (28)
and (33) that abut cylinder (31) are flat and free from burrs
and surface marking. If necessary lap on a flat very fine
grade of abrasive paper. When refitting the complete motor
assembly in the housing (36) first make sure the assembly
is clamped tightly together and the rotor (29) spins freely.
Slide the assembly with pin (32) into the housing (36)
ensuring that the motor locating pin (32) locates in the hole
in the bottom of the main bore of housing (36) situated
between the two main ports. Reassemble in the reverse
order.
Reset the clutch and/or the air pressure as required - see
Section Operating.
trigger on the tool. Disconnect the air line and pour into the
intake bushing 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
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