Universal Air Tools UT8644-H User Manual

Operator Instructions Important

t

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Includes - Foreseen Use, Work Stations, Putting Into Service,
Operating, Dismantling, Assembly and Safety Rules

Manufacturer/Supplier Product Type

Universal Air Tool Company Limited
Unit 8
Lane End Industrial Park
High Wycombe
Bucks
HP14 3BY

Tel No Fax No

[phone] (01494) 883237

Read these instructions carefully before insta lling, operating,
servicing or repairing this tool. Keep these instructions in a safe
accessible place.

Chipping Hammer

Model No/Nos Serial No

UT8644-H - 4” Stroke
Outside Lever Handle

RPM

N/A

Cycles Per Min

1,500

Product Nett Weight

18.5

8.4 1/2 13 30 10

Recommended Working
Recommended Minimum
Maximum

Use - Safety Glasses
Use - Safety Gloves
Use - Safety Boots

lbs
Kg

Air Pressure

Perso n a l Sa fe t y E q ui pm en t

Recommended Use Of

Balancer Or Support

No

6.3

bar

90

PSI

n/a

7.0

bar
bar

Yes
Yes

n/a

100

PSI
PSI

Recommended Hose Bore

Size - Minimum

Ins M/M Ft M

Noise Level

Sound Pressure Level 94.0 dB(A)
Sound Power Level 105.0 dB(A)

Test Method

Tested in accordance with Pneurop

est code PN8NTC1 and ISO Standard 3744

Vibration Level

Test Method

ested in accordance with ISO

11.1

standards 8662/1 Parts 1 & 2

Use - Breathing Masks
Use - Ear Protectors

Foreseen Use of the Tool

The tool is designed for the purpose of chipping, riveting and
scaling of metals and stone. In general terms a reciprocating
free piston in the cylinder of the tool imparts a blow to the chisel
or working attachment. A list of suitable equipment to use with
this tool can be provided by the manufacturer. Do not use the
tool for any other purpose than that for which it was designed
with out co nsul ti ng th e ma nufa ctur er or th e man uf act urer ’s
authorised representative.
Do not modify the tool for it’s use as a chipper etc. or for any
other purpose without first agreeing any such modification with
the manufacturer or the manufacturer’s authorised
representative.

Work Stations

The tool should only be used as a handheld, 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 u se, the
operator must be in
a secure position
having a firm g rip
and footing a nd be
aware of a reaction
force on the hand as
result of the tool
doing work.

Yes

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 sys tem withou t incorporating an easy to reach a nd
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 hose adaptor a teaspoonful (5ml) of a suitable

Recommended Max.

Hose Length

Metres/Sec²

Page No 1

pneumatic motor lubricating oil preferably incorporating a rust
inhibitor. Reconnect tool to air supply and run tool slowly for a
few sec onds 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.

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.

Dismantling & Assembly Instructions

Disconnect tool from air supply.
Gri p ha nd l e ( 1 2 ) b y t h e g r ip part in a vi c e an d i n se r t 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 un screw 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). T ake out piston (20) from cy linder (21). When
separa ting parts (13), (14), (15) and (16) ca refully 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.
Connec t to a suitable a ir supply and run the tool for 2 to 3
seconds to allow the oil to circulate.

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 maximu m working air pressure.

3) Use personal safety equipment.

4) Use only compressed air at the recommended conditions.

5) I f the too l appea rs to mal functio n remove f rom 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 u sing the tool a dopt 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, w ire, etc. the on/off va lve 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 observ e all r ele va nt lega l requ irem ents wh e n in st alling,
using or maintaining the tool.

16) Do not install the tool unless an easily accessible a nd 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 a s such c onditions 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
atmo spheres use spar k resist ant chi sels usua lly mad e 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.

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