Universal Air Tools UT8741A User Manual

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Operator Instructions Important

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V

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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
el No Fax No(01494) 883300 (01494) 883237

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

Straight Lever Type Drill

Model No/Nos Serial No (if any)

UT8741A

RPM

4,500

Cycles Per Min

Product Nett Weight

2.20

1.0 3/8 10 30 10

Recommended Working
Recommended Minimum
Maximum

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

lbs
Kg

Air Pressure

Personal Safety Equipment

Recommended Use Of

Balancer Or Support

No

6.3

bar

90

n/a

bar

n/a

7.0

bar

10.0

Yes

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
without consulting the manufacturer or the manufacturer'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
standing on the solid floor.
It can be used in other
positions but before any
such use, the operator
must be in a secure
position having a firm grip
and footing and be aware
that the drill can develop a
torque reaction see
section "Operating".

Recommended Hose Bore

Size - Minimum

Ins M/M Ft M

Noise Level Sound Pressure Level 91.9 dB(A)

PSI
PSI
PSI

est Method Tested in accordance with Pneurop

test code PN8NTC1 and ISO Standard 3744

ibration Level

Sound Power Level 104.5 dB(A)

Less than 2.5

est Method Tested in accordance with ISO

standard 8662/1

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 system without incorporating an easy to reach and
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

Recommended Max.

Hose Length

Metres / Sec²

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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.

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 h o l e i s t o b e 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
counteract any sudden movement 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 tough. The torque reaction can occur when the drill
breaks through the material being drilled, particularly on sheet
metal. Always use eye protection and hand protection is
advised, particularly when drilling holes in metals where the
material being removed from the hole is in the form of long
sharp strips. Do not tie the drill chuck key to the drill as the
attaching device i.e. string or chain could become entangled
with the rotating chuck and bit etc.
If using an abrasive device, drilling stone or performing any
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 Instruction

Disconnect tool from air supply.
Insert the drill chuck key securely into the chuck (37) and strike
the chuck key a sharp blow with a hammer in a direction to
loosen a right hand treaded joint to remove the chuck and chuck
spacer (36). Grip motor housing (7) with housing cover (6) in a
vise fitted with soft jaws and unscrew inlet bushing (2) together
with screen (1). With a needle pointed tool prise out retaining
ring (3), pull out deflector (4) and remove o-ring (5) from it. Drive
out roll pin (8) and remove throttle lever assembly (9). Unscrew
valve screw (16) with o-rings (14,15) and from the lever side
push out air regulator (13), spring (12), o-ring (11), and valve
stem (10). Unscrew clamp nut (35) from reducer (29) complete
with the internal gear drive assembly. From the front end push
out the internal gear assembly complete with internal gear (30).
Pull off bearings (34), spindle with pins (33), needle bearing (32)
and idler gear (31). Unscrew reducer (29) from motor housing
(7). Pull out the motor assembly from the motor housing (7).
Take off pinion gear (28) and spacer (27) from rotor (22). Grip
front plate (24) by hand and tap the spindle end of rotor (22)
with a non metallic (lead or aluminum) hammer so as to drive

the rotor through the front end plate and bearing assembly. Pull
off bearing (26) from the front plate (24). Do not remove pins
(23, 25, and 19) from the end plates (24, 18) unless
replacements are required. Take off cylinder (20) noting its
orientation with the rear plate (18) for reassembly and take out
4 off rotor blades from rotor (22). Support the rear plate (18) in
a piece of tube with a bore diameter as close as possible to the
maximum diameter of the rotor (22) and tap the non-splined end
of the rotor to drive it through the rear plate and bearing
assembly. With a suitable punch tap out bearing (17) from rear
plate (18). Remove the housing cover (6) from motor housing (7)
when needed.

Reassembly

Clean all component parts and examine to wear before
reassembling. Use only manufacturer or distributor supplied
spare parts. Check in particular for wear and cuts on o-rings and
wear on rotor blades. Lightly coat all parts with suitable
pneumatic tool lubricating oil preferably one incorporating a rust
inhibitor. Pack all bearings and gearbox with a lithium or
molybdenum based general purpose reassemble in the reverse
order (see note below). For the motor assembly ensure that
front and rear plates that abut the cylinder are clean and free
from burrs and surface marking. If necessary, lap faces that abut
the cylinder on a flat fine grade of abrasive paper. Press bearings
into front and rear plates, support the bearing in the rear plate
on its inner ring and tap the rotor its splined end with a soft
metallic hammer into the bearing until rotor locates against the
rear plate. Support the inner face of the end plate as close as
possible to the largest diameter of the rotor and tap the non­splined end of the rotor until a clearance of 0.0015” (0.04mm)
to 0.0025” (0.065mm) is obtained between the inner face of
the rear plate and rotor. This clearance has to be checked when
pulling the rotor away from the rear plate and bearing assembly.
Spin rotor to ensure that it will rotate freely in the rear plate
bearing. Locate the cylinder by the locating pin to the rear plate
checking that the ports in the end plate match with those in the
cylinder. Insert the four motor blades into the rotor and locate
correctly the front plate to the cylinder using the locating pin.
Ensure that the rotor will spin freely in the assembly. This is the
best checked by placing the motor assembly in a vee block and
squeezing the front and rear plates against the cylinder. When
refitting motor assembly to motor housing (7) ensure that pin
(25) in the side of front plate (24) locates in the slot in the front
of the main bore of motor housing (7).

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 personnel.

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.

6) Check hose and fittings regularly for wear. Do not carry the
tool by its hose and ensure that the hand is remote from the
on/off valve (trigger) when carrying the tool with air supply
connected.

7) Do not exceed maximum recommended air pressure. Avoid
low air pressures as this will allow the drill to stall more easily
and develop torque reaction.

8) Use safety equipment as recommended.

9) The tool is not electrically insulated. Do not use where there
is a possibility of coming into contact with live electricity, gas
pipes, water pipes, etc. Check the area of operation before
performing the operation.

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