Page 1
Tel No
(01494) 883300
(01494) 883237
Includes - Foreseen Use, Work Stations, Putting Into Service, Operating,
Operator Instructions Important
Read these instructions carefully before installing, operating,
servicing or repairing this tool. Keep these instructions in a safe
Test Method
Tested in accordance with Pneurop
test code PN8NTC1 and ISO Standard 3744
Vibration Level
Test Method
Tested in accordance with ISO
Less than 2.5
Dismantling, Assembly and Safety Rules
Manufacturer/Supplier Product Type
Universal Air Tool Company Limited
Unit 8
Lane End Industrial Park
High Wycombe
Bucks
accessible place.
RPM
1/2 Capacity Pistol Grip
500
Cycles Per Min
Drill
Model No/Nos Serial No (if any)
UT8850A
HP14 3BY
Fax No
Product Nett Weight
3.5
1.42 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
bar
6.3
n/a
7.0
bar
bar
90
n/a
100
Yes
Recommended Hose Bore
Noise Level
PSI
PSI
PSI
standard 8662/1
Size - Minimum
Ins M/M Ft M
Sound Pressure Level 84.0 dB(A)
Sound Power Level 93.24 dB(A)
Recommended Max.
Hose Length
Metres / Sec²
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".
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.
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Page 2
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.
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 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 Instructions
Disconnect tool from air supply.
The drill chuck (42) may be removed from the assembly by securely
placing the chuck key in the chuck, covering the chuck and key with a
cloth and striking the chuck key a sharp blow in the direction to loosen
a right handed joint, i.e. the direction of rotation of the tool to take off
chuck spacer (37).
Remove handle bracket (39) and dead handle (41) by unscrewing
handle and unscrew cap screw (38) with nut (40).
Place the tool in a vice fitted with soft jaws on the flats of housing (6) with
housing cover (1) with the handle section pointing upwards. Unscrew
hose adaptor (2) and remove 2 of screws (3) and take off muffler
diffuser (4). Unscrew lock ring (36) and pull out gear assembly being
careful not to loose key (25) with motor assembly from housing (6) with
housing cover (1).
To dismantle the gear assembly, grip the threaded shaft and pull it out of
internal gear (26). 2 of ball bearings (33) may be pressed out of internal
gear (26). Support ball bearing (33) on the gear side in a piece of tube
and carefully, so as not to damage the thread, tap the end of spindle
(31) to apart reduction spindle (29) with idler gears (28) and to drive it
through the bearing.
Take off inner collar (35), outer collar (34), and seal plate (32).
Push out 3 of idler gears (30) and (28) from spindle (31) and reduction
spindle (29).
Whenever replacement is needed, 6 of cages will be dismantled from
idler gear (30) and (28).
To dismantle the motor assembly, prise out bearing cap (15) and
remove retaining ring (16).
Grip the front plate (23) by hand and with a non metallic or soft metal
(lead or aluminium) hammer, tap the splined end of rotor (20) to drive it
through the front end plate and bearing assembly.
Remove the cylinder (22) noting its orientation to front plate (23) and
rear plate (18) for
reassembly and remove 5 of rotor blades (21) from rotor (20). Support
the rear plate (18) on a piece of tube with a bore diameter just larger
than the maximum diameter of the rotor and tap the non splined end of
the rotor to drive the rotor through the rear end plate and bearing
assembly.
With a suitable punch, drive out ball bearing (17) from rear plate (18)
and ball bearing (24) from front plate (23). Do not remove pins (19)
from end plates (23) and (18) unless replacements are required.
Drive out roll pin (5) slowly and carefully so as not to damage the seals,
grip the trigger (13) and pull out the control valve assembly. Unscrew
set screw (14) and take off trigger (13) from valve stem (9).
Remove spring (12) and slide valve stem (9) through valve bushing (10).
Remove o-ring (7) from valve stem (9) and o-rings (11) and (7) from
valve bushing (10). Take off o-ring from housing (6).
Reassembly
Clean all component parts and examine for 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 a suitable pneumatic tool lubricating oil,
preferably one incorporating a rust inhibitor. Pack all bearings and
gearbox with a lithium or molybdenum based general purpose grease
and reassemble in the reverse order (see below).
For the motor assembly ensure that the front and rear end 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 end plates, support the bearing
in the rear end plate on its inner ring and tap the rotor on its splined end
with a soft metallic hammer into the bearing until the rotor locates
against the rear end plate. Support the inner face of the end plate as
close as possible to the largest diameter of the rotor and tap the non
splined end of the rotor until a clearance of 0.0015" (0.040mm) -
0.0025" (0.065mm) is obtained between the inner face of the rear
plate and the rotor. This clearance should 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 end plate bearing. Locate the
cylinder by the locating pin to the rear plate checking that the ports in
the rear end plate match with those in the cylinder. Insert the five rotor
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 best checked by placing the motor assembly in a vee
block and squeezing the front and rear end plates against the cylinder.
Fit retaining ring (16) and insert rear bearing cap (15) into rear plate (18).
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.
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Page 3
UT8850A 1/2 Capacity Pistol Grip Drill
Aug 2006 Ver 1.00
Ref No Part No Description
1 901511 Housing Cover
2 731920 Hose Adapter
3 931921 Screw (2)
4 931922 Muffler Diffuser
5 931930 Roll Pin
6 901528 Housing
7 729091 O-Ring (2)
8 729591 O-Ring
9 731926 Valve Stem
10 731927 Valve Bushing
11 729073 O-Ring
12 731925 Spring
13 731929 Trigger
14 731928 Set Screw
15 729178 Bearing Cap
16 729011 Retaining Ring
17 729012 Ball Bearing
18 901529 Rear Plate
19 729707 Pin (2)
20 901530 Rotor
21 729709 Rotor Blade (5)
22 729708 Cylinder
Ref No Part No Description
23 901531 Front Plate
24 731274 Ball Bearing
25 729966 Key
26 901532 Internal Gear
27 901533 Needle Bearing (6)
28 901534 Idler Gear (3)
29 901535 Reduction Spindle
30 901536 2nd Idler Gear (3)
31 901537 Spindle
32 720231 Seal Plate
33 732081 Ball Bearing (2)
34 900273 Outer Collar
35 900274 Inner Collar
36 901538 Lock Ring
37 730229 Chuck Spacer
38 900339 Cap Screw
39 901000 Handle Bracket
40 900340 Nut
41 731773 Handle
42 H0020
* H0024 Chuck Key
1/2" Drill Chuck w/key
(13mm)
* Not Shown
Page No 3
Page 4
Accessories
Declaration of Conformity
Universal Air Tool Company Limited
Unit 8, Lane End Industrial Park, High Wycombe, Bucks, HP14 3BY, England
declare under our sole responsibility that the product
Model UT8850A 1/2” Capacity Pistol Grip Drill, Serial Number
to which this declaration relates is in conformity with the following standard(s) or other normative document(s)
EN792 (Draft), EN292 Parts 1 & 2, ISO 8662 Part 1, Pneurop PN8NTC1
following the provisions of
89/392/EEC as amended by 91/368/EEC & 93/44/EEC
Lane End D.H.Moppett (Man Director)
Place and date of issue Name and signature or equivalent marking of authorised person
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.
10) Take care against entanglement of moving parts of the tool with
clothing, ties, hair, cleaning rags, etc. This will cause the body to be
moved towards the work process and can be very dangerous.
11) Do not attempt to hold or guide the drill chuck when the tool is
running. Keep hands clear of the drilling process.
12) Use only compressed air at recommended conditions.
13) Do not attempt to fit attachments, i.e. for sawing, hedge cutting,
grinding, chain sawing, etc.
14) If the tool appears to malfunction remove from use immediately
and arrange for service and repair.
15) If an additional side handle is fitted to the tool ensure that it is
correctly positioned and fixed securely.
16) If the drill is used with a balancer or other suspension device ensure
that it is fixed securely.
Notes
Distributor
This document may not be copied wholly or in part by anyone without the consent of the Directors of Universal Air Tool Company Limited
Designed & Written in the U.K.
©Copyright of Universal Air Tool Company Limited, established in the United Kingdom, 1994
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