Universal Air Tools UT8824 User Manual

Operator Instructions Important

t

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.

3/8 Capacity Pistol Grip
Drill

Model No/Nos Serial No (if any)

UT8824

RPM

2600

Cycles Per Min

Product Nett Weight

2.2

1.0 3/8 10 30 10

Recommended Working
Recommended Minimum
Maximum

Use - Safety Glasses
Use - Safety Gloves
Use - Safety Boots
Use - Breathing Masks

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

n/a

100

PSI
PSI

Recommended Hose Bore

Size - Minimum

Ins M/M Ft M

Noise Level

Sound Pressure Level 85.5 dB(A)
Sound Power Level 97.1 dB(A)

Test Method

Tested in accordance with Pneurop

est code PN8NTC1 and ISO Standard 3744

Vibration Level

Test Method

Less than 2.5

Tested in accordance with ISO

standard 8662/1

Recommended Max.

Use - Ear Protectors

Foreseen Use Of Tool

This drill is designed for the purpose of drilling holes in all types
of materials, i.e. metals, wood, stone, plastics etc. using drilling
bits designed for this purpose. It may be used with other forms
of cutting tools, polishing devices or for sanding using coated
abrasive products. Before using any such products first check
with the manufacturer their suitability for use with this type of
drill. Do not use bonded abrasive products (i.e. grinding wheels)
or saw blades or any device which has a permitted safe working
speed less than the free speed of the drill.
Do not use this drill for any other purpose than that specified
with out co nsul ti ng th e ma nufa ctur er or th e man uf act urer 's
authorised supplier.

Work Stations

The tool should only be
used as a handheld hand
operated tool. It is always
recommended that the
tool is used when stand-
ing on th e solid floor. It
can be used in other po-
sitions but before any
such use, the operator
must be in a secure posi-
tion having a firm grip
and footing and be aware
that the drill can develop
a torque reaction see
section "Operating".

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

Hose Length

Metres / Sec²

Page No 1

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 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

Select suitable drill bit, insert the shank into the drill chuck as far
as possible and tighten chuck with key supplied making sure
that the shank of the device is securely clamped centrally
between the three chuck jaws. Remove chuck key.
When drilling holes of all sizes it is advised to use a pointed
punch to mark the centre at which the hole is to be drilled as
this will provide a starting point for the drill tip. This procedure
will prevent the drill bit from skidding, ensure that the hole is
drilled where intended and help to prevent drill breakage when
using small drills. When drilling, particularly with small diameter
drills, always try to ensure that load applied to the drill is such
that the drill bit is always at right angles to the hole being drilled.
Do not force the drill but allow it to cut.
When drilling always adopt a firm posture to be able to
counte ract an y sudden moveme nt of the drill due to torque
reaction. Such torque reaction can occur when the drill stalls
due to a too heavy load being applied or the material being too
hard or tou gh. The torque reaction c an occur w hen the drill
breaks through the material being drilled, particularly on sheet
metal . A lw ays us e eye p r ot ecti o n and hand p ro tec ti o n is
advised, particularly w hen drilling h oles in me tals whe re the
materia l being remove d from the hole is in the form of long
sharp strips. Do not tie the drill chuck key to the drill as the
attach ing device i.e. string or chain could become entangled
with the rotating chuck and bit etc.
If using a n abrasive device, drilling stone or performing a ny
operation where dust is created, it is recommended to use a
breathing mask.
Always ensure that the material to be drilled is firmly fixed to
prevent its movement.
It is also recommended that when drilling holes of large
diameter to first pre drill a hole of smaller diameter as this will
reduce effort required to drill the hole and minimise torque
reaction.

Dismantling & Assembly Instructions

Disconnect drill from air supply.
The drill ch uck (25) ma y be removed by placing the c huck
adjusting key securely in the chuck and giving the key a sharp
tap with a hammer in the direction to loosen a right hand
threaded joint. If this fails to remove the chuck remove it after
the gearbox assembly has been removed from the drill handle.
(See later). Place motor housing (1) in a vice fitted with soft jaws
with the h andle section pointing upwards, unsc rew bushing
(26), remove s crew (4) a nd exh aus t deflector (3). Un scre w
locknut (24) to remove gearbox and pull out motor assembly.
If the drill chuck has not been removed as it is too tightly fitted,
it can be rem oved as follows. Pull off ring gear (20) from
gearbox and pull off 3 off idler gears (21). Use a suitable square
section bar inserted between the pins in idler gear plate (22),
pushed up against the face to ensure that contact is made at the
bottom of the pins and unscrew the chuck using the chuck key.
Do not use a round bar or locate at the outer edge of the pins
as this may distort the 3 pins. A length of 8mm (0.312) square
bar is ideal for this purpose. Continue to dismantle the gearbox

by supporting ball bearings (23) on the gear side in a piece of
tube of suitable bore to just clear the largest diameter of idler
gear plate (22) and press out idler gear plate from bearings 2
off- (23). It is recommended that the pins in the idler plate (22)
are not removed for replacement and the complete idler gear
plate (22) is replaced. For information the nominal diameter of
the thre e pins in the idler plate (22) is 0.1574 ins (4 mm).
Replacement is required if the pins are badly damaged or worn
below 0.155 (3.937 mm) diameter.
To dismantle motor assembly grip the front end plate (19) tightly
by hand and tap the gear end of the rotor with a non metallic or
soft metal (lead or aluminium) hammer through the front end
plate (19) and bearing (13). Remove 4 off rotor blades (17) and
cylinder (18). Hook out plastic shield from rear end plate (14).
Support rear end plate (14) in a piece of tube with a bore size
as close as possible to the largest diameter of the rotor (14) and
tap the non splined end of the rotor to remove it from the rear
end plate and bearing assembly. Tap out bearing (13) from rear
end plate (14) and bearing (13) from front end plate (19).
Tap out trigger retaining pin (2) and pull out trigger assembly.
Remove trigger (10) from valve stem (6). Remove valve stem (6)
from valve bushing (9) and remove O-Rings (5). Remove 2 off
O-Rings (7) and O-ring (8) from valve bushing (9).

Reassembly

Clean all co mp onent part s and e xamin e for wear b efo re
reass embling. Use only ma nufactu rers or dist ributor supplied
spare parts. Check in particular for wear and cuts on O-Rings
and wear on rotor blades. Lightly coat all parts with a suitable
pneuma tic tool lubricating oil. Pack all bearings and gearbox
with a general purpose lithium or molybdenum based general
purpose grease.
Assemble in reverse order - see notes below.

Motor Assembly

If fitting a new rotor very lightly deburr the edges of the rotor
slots. Make sure rotor blade slots are clean. Make sure that the
faces of the front and rear end plates (19) and (14) that abut
cylinder (18) are free from burrs and surface marking. If
necessary lap faces on a flat, very fine grade of abrasive paper.
Press bearing (13) into end plates (14) and (19). Support bearing
(13) in rear end plate on the inner race and tap rotor on the gear
end with a soft metal or non metallic hammer until the rotor
locates against the face of the rear end plate. Support the inner
face of the rear end plate in a piece of tube with a bore diameter
as close as possible to the largest diameter of the rotor and tap
the non splined end until a clearance of 0.040mm (0.0015") to

0.065mm (0.0025") is obtained between the inner face of the
rear end plate and the rotor. This clearance to be checked when
pulling the rotor by hand away from the rear e nd plate and
bearing assembly.
Spin rotor to ensure that it will spin freely in the rear end plate
and bearing assembly. Fit rotor blades and cylinder ensuring that
the pin in one end of the rotor cylinder locates in the round hole
in the rear end plate. Push on front end plate and check that
rotor still rotates freely.
Reassemble tool in reverse order.

Safety Rules When Using A Drill

1) Read all the instructions before using this tool. All operators
must be fully trained in its use and aware of these safety rules.
All service and repair must be carried out by trained personne l.

2) Always select a suitable cutting, abrasive device suitable for
use with this drill.

3) Always shut off the air supply to the drill and depress the
trigger to exhaust air from the feed hose before fitting, adjusting
or removing the device. Remove drill chuck.

4) Always adopt a firm footing and/or position and be aware of
torque reaction developed by the drill.

5) Use only correct spare parts.

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