Universal Air Tools UT8644-H - 4 Stroke - Manual (Page 2)

Dismantling & Assembly Instructions
Disconnect tool from air supply.
Grip handle (12) by the grip part in a vice and insert a
screwdriver in the loop end of lock coil spring (24) and pull out
the spring. Slide off retaining sleeve (25) and pull out the chisel
as fitted. Loosen the 2 off jubilee clips holding silencer (26) in
position and slide off the silencer assembly over the front end of
cylinder (21). Insert a suitable tool in the slit in lock shield (19)
and prise it open sufficiently to be able to remove it over the
cylinder (21). Slide or carefully tap off the lock (18). Note at this
time how the lock (18) slides over and locates on the splines of
the cylinder (21) and how the tangs on the lock (18) locate in
the cut outs on the front of handle (12). Locate a suitable
spanner on the flats on cylinder (21) and unscrew and remove
cylinder (21) from handle (12). Note that the cylinder is tightened
firmly on assembly and it may be necessary to use an extension
tube over the spanner to provide the required force to loosen
the cylinder.
Take off upper valve case lid (13), valve (14), valve case (15) and
lower valve case lid (16) and remove 2 off dowel pins (17) from
cylinder (21). Take out piston (20) from cylinder (21). When
separating parts (13), (14), (15) and (16) carefully note the
orientation of each part and when refitting the valve assembly to
the cylinder via the dowel pins (17) to locate the valve assembly
on the pins so that the valve assembly is concentric to the
cylinder.
Unscrew and remove hose adaptor with screen (8). Drive out
pins (9) and (10) and remove lever (11). Unscrew throttle valve
plug (1) and take out throttle valve spring (2). Throttle valve (3),
O-ring (4) and pins (6) and (7). Do not remove bushing fitted into
handle (12).
Reassembly
Clean and examine all parts and replace any parts only with
parts obtained from the manufacturer or an authorised supplier.
Reassemble in the reverse order. Note that when refitting lock
(18) first tighten the cylinder (21) to handle (12) securely and
slide the lock (18) over the cylinder (21) and locate it on the
splines. The lock must locate on the splines and the tangs on it
in the front of the handle. It may be necessary to try the lock in
different radial locations and/or tighten the cylinder further. With
the trigger (11) depressed pour into hose adaptor (8) 5ml of a
suitable pneumatic tool lubricating oil and release trigger.
Connect to a suitable air supply and run the tool for 2 to 3
seconds to allow the oil to circulate.
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
Operating
Connect tool to clean supply of compressed air at
recommended pressure. Select chisel/attachment to perform
the work task and ensure that the chisel retainer is securely
fitted. Do not use tool without retainer sleeve (22) fitted. The
power of the tool may be controlled by the input air pressure.
Always ensure that the working tool is in contact with the
workpiece before pressing the trigger. Running the tool free will
reduce tool life by placing unnecessary high loads on tool
retainers and cylinders.
Be aware that exposure to vibration can cause injury.
Safety Rules For A Percussive Air
Hammer
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) Never point a tool at any person.
20) Use only suitable pneumatic tool lubricants. This is important
as a safeguard against the “diesel effect” i.e. explosive mixtures
firing.
21) Chisels worn/blunt at the cutting edge or shank should not
be used as such conditions promote tool breakage, reduce
efficiency and increase vibration. A chisel which breaks can
cause injury by creating unexpected movement.
22) When chipping or scaling in potentially explosive
atmospheres use spark resistant chisels usually made of
beryllium copper. Consult the manufacturer of the tool standard
chisels about sources of supply.
23) Do not store chisels etc. at freezing and below freezing
temperatures. Freezing temperatures can make hardened-tool
steels brittle which can cause breakage and lead to injury.
24) Do not start tool until steel/chisel/needles are in contact
with the working surface. Do not run tool unless retainer is fitted.
25) Always use tool with a whip hose as shown in fig 1.
26) Don’t over reach. Keep proper footing and balance at all
times.
27) Do not force the tool but allow it to cut.
28) When possible secure work with clamps or vice so both
hands are free to operate the tool.
29) Use correct size of chisel shank to match the tool.