Universal Tool UT919C Specifications

Read these instructions carefully before installing, operating,
servicing or repairing this tool. Keep these instructions in a safe
accessible place.
Important
Includes - Foreseen Use, Work Stations, Putting Into Service, Operating,
Dismantling, Assembly and Safety Rules
Operator Instructions
Manufacturer/Supplier Product Type
RPM
Cycles Per Min
Model No/Nos Serial No
Product Nett Weight
lbs
Kg
Recommended Use Of
Balancer Or Support
Recommended Hose Bore
Size - Minimum
Recommended Max.
Hose Length
Ins M/M Ft M
No
Page No 1
9“ Dia Wheel Vertical
Grinder
UT919C
12.76 (less wheel)
5.8 (less wheel)
3/8 10 30 10
6,000
Universal Air Tool Company Limited
Unit 8
Lane End Industrial Park
High Wycombe
Bucks
HP14 3BY
Work Stations
The tool should only be used as a hand held 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 use the
operator must be in a secure position having a firm grip and footing and
be aware of the safety rules to be obeyed when using the sander.
Foreseen Use of Tool
This vertical grinder is designed to be used with reinforced resin bonded
depressed centre grinding wheels that have a permitted rotational
speed in excess of 6,000 RPM.
The tool is designed to be used for grinding and dressing of welds, etc.
but not for cutting off. The grinder must never be used if a wheel guard
(disc cover) item (33) is not fitted.
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 run-
ning with the trigger/lever fully de-
pressed. 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 incor-
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porating an easy to reach and operate air shut off valve. The air supply
should be lubricated. It is strongly recommended that an air filter, regu-
lator, 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, de pressurising the line by pressing the trigger on the tool. Dis-
connect the air line and pour into the air inlet bushing a teaspoonful
(5ml) of a suitable pneumatic motor lubricating oil preferably incorpo-
rating 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 bar.
Noise Level Sound Pressure Level 89.7 dB(A)
Test Method Tested in accordance with Pneurop
test code PN8NTC1 and ISO Standard 3744
Sound Power Level 100.7 dB(A)
Vibration Level
Test Method Tested in accordance with ISO
standards 8662/1 & 8662/4
4.9
Metres / Sec²
Personal Safety Equipment
Use - Safety Glasses
Yes
Use - Safety Gloves
Yes
Use - Safety Boots
Use - Breathing Masks
Yes
Use - Ear Protectors
Yes
Air Pressure
Recommended Working
6.3
bar
90
PSI
Recommended Minimum
n/a
bar
n/a
PSI
Maximum
7.0
bar
10.0
PSI

Page No 2
Safety Rules For A Grinder
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) A grinding wheel should only be fitted by a competent person
trained to do so. The wheel must be of the correct size and speed rating.
20) Check the speed of the grinder at least once per week, if it is in
regular use, with an accurate tachometer.
21) The tool must only be used with the grinding wheels as set out in
section “Foreseen Use of the Tool” and shown on parts list. Never fit any
other device.
22) Carry out the instructions as set out in “Putting into Service”.
23) Many countries have local or national rules re the use and fitting of
grinding wheels. Make sure such rules are observed.
24) Use a barrier to prevent sparks causing a hazard to the operator,
any other person or anything within the vicinity of the sparks.
25) If a wheel guard becomes damaged or has withstood a wheel
breakage, the guard must be changed.
26) Do not use chipped or cracked grinding wheels.
27) Always wear impact resistant eye protection.
28) Use only the wheel receivers (36) & (37) provided with the grinder
for locating and clamping the wheel. Never use substitutes. Use the
paper blotter fixed to the wheel as this ensures even tightness when the
wheel is secured.
29) Tighten the wheel plates sufficiently to prevent wheel spin off when
the grinder is turned off. Do not tighten excessively as this may crack the
wheel.
30) The noise from the tool or the process noise of the grinding
operation may be such that hearing protection should be worn.
31) Avoid inhaling dust from the grinding process. Wearing of a
breathing mask is recommended. Grinder certain materials may mean
that special breathing precautions are necessary. Seek advice before
using the tool.
32) Always ensure that the workpiece is firmly supported so that it
Operating
With the grinder correctly connected to the air supply, check the speed
of the grinder with an inlet pressure of 100 psi/7.0 bar measured at the
tool inlet. Check with a calibrated tachometer. Check that the guard is in
position and securely fixed. Check that the grinding wheel is of correct
dimensions, is not cracked or chipped and has a permitted speed
rating higher than the maximum permissible running speed of the
grinder which is 6,000 RPM. Check that item wheel receiver (36) or
(37) is the correct type as parts list and is located to the shaft and locates
the bore of the grinding wheel on the spigot of the wheel nut (36) or
(37) and screw on wheel nut (36) or (37) using the spanners provided.
Do not over tighten as this could crack the wheel. It should be tight
enough to prevent wheel spin off when the air supply is shut off. Lock
screw (38) in place.
When first starting the grinder with a new or changed wheel fitted, the
grinder should first be started in a protected area, i.e. such as under a
heavy bench well away from other persons and run for, say, one
minute. This will provide protection if the wheel should break because
some fault was not detected.
Always use eye protection and wear protective gloves if there are sharp
edges in the working area. The tool and the grinding process can create
a noise level such that ear protectors should be worn.
If the grinding process creates a dust then use a suitable breathing
mask.
Check that the material being worked will not cause harmful dust or
fumes. If this is so then special breathing apparatus may be required.
Seek advice before starting work.
If the grinder vibrates when first fitting the wheel or during use, remove
from service immediately and arrange for the fault to be corrected
before continuing to use.
Do not apply excessive pressure as this will reduce the cutting
efficiency. Apply light loads and allow the wheel to cut.
Handle the grinder with care. If the grinder is dropped, carefully
examine the wheel for damage and replace if necessary. Start the
machine as if for the first time of fitting a wheel, i.e. under a bench.
Make sure the object to be ground is in a firm fixed position.
Dismantling & Assembly Instruction
Disconnect tool from air supply.
Remove allen head screw (38). Grip wheel flange (36) with spanner (67)
and by using spanner (66) unscrew wheel flange (37). Unscrew 4 off hex
bolts and remove wheel guard (33). Remove dead handle (55) and take
off washers (56 & 57). Unscrew bolts (53 & 54) and remove exhaust
cover (47). Take off muffler spring (51) pull out roll pin (50) and take out
muffler plate (49) and exhaust valve (48). To remove throttle valve
assembly, first unscrew inlet bushing (46) take out throttle valve spring
(45) sub throttle valve (44) throttle valve washer (43) throttle valve (42)
throttle valve rod (41) and throttle valve rod bushing (40).
To remove the throttle valve body (39), first unscrew 2 off bolts (64) and
remove the O-ring (62) set bolt (61) lock key (59 and lock spring (60).
Remove 4 off bolts (2) and take off the housing cover (1). Pull out the
governor assembly comprising of parts (7,8,9,10,11,12,13,14 & 15)
then pull out the motor assembly, unscrew the rotor nut (30) remove
bearing spacer (29) and bearing (28). Grip cylinder lower plate (26) by
hand and tap the spindle end of rotor (20) with a non metallic (lead or
aluminium) hammer so as to drive the rotor through the cylinder lower
plate and bearing assembly. Remove rotor blades (21) from the rotor
(20) then take off the cylinder upper plate (18) and remove bearing (17)
and bearing cover (16).
Reassembly
All parts should be examined for damage and wear before
reassembling. Only manufacturer or authorised distributor
parts should be used – see note re speed controller. All parts
should be coated with a pneumatic tool lubricating oil and
reassembled in reverse order. Before the tool is returned to
serviceitshouldbeexaminedbyacompetentpersontrainedto
do so. The speed of the tool must be checked and the speed
mustnotexceed6,000RPMwiththeairpressuremeasuredat
thetoolinletof100lbfpersqins(6.3bar).

UT919C 9“ Dia Wheel Vertical Grinder
Page No 3
Mar 2007 Ver 1.0
Ref No Part No Description
1 A-109001 Housing Cover
2 A-905031 Hex Bolt (4)
3 R-852024 Spring Washer (4)
4 A-109002 Washer
5 A-905047 Eillister (3)
6 A-109003 Packing
7 A-109004 Governor Cage
8 A-109005 Governor Weight (2)
9 B-609023 Roll Pin (2)
10 A-109006 Governor Shaft
11 A-109007 Governor Valve
12 A-109008 Governor Valve Spring
A-109009 Governor Valve Spring
13 A-109010 Governor Valve Spring
Holder
14 A-109011 Flat Head
15 A-109012 "U" Nut
16 A-109013 Bearing Cover
17 A-109014 Bearing
18 A-109015 Cylinder Upper Plate
19 A-109016 Roll Pin
20 A-109017 Rotor
21 A-109018 Rotor Blade (5)
22 A-109019 Cylinder
23 A-107009 Roll Pin (2)
24 A-109020 Adjusting Collar
25 A-109021 Adjusting Washer
A-109022 Adjusting Washer
26 A-109023 Cylinder Lower Plate
27 A-109024 Adjusting Washer
28 A-109025 Bearing
29 A-109026 Bearing Spacer
30 A-109027 Rotor Nut
31
A-109028 Adjusting Washer
A-109029 Adjusting Washer
A-109030 Adjusting Washer
32 A-109031 Housing
33 A-109032 Wheel Guard
34 R-852024 Spring Washer (4)
Ref No Part No Description
35 A-109033 Hex Bolt (4)
36 A-109034 Wheel Flange
37 A-109035 Wheel Flange
38 A-109036 Head Screw
39 A-109037 Throttle Valve Body
40 A-109038 Throttle Valve Rod
Bushing
41 A-109039 Throttle Valve Rod
42 A-109040 Throttle Valve
43 A-109041 Throttle Valve Washer
44 A-109042 Sub Throttle Valve
45 A-109043 Throttle Valve Spring
46 A-109044 Inlet Bushing
A-109045 Inlet Bushing
47 A-109046 Exhaust Cover
48 A-109047 Exhaust Valve
49 A-109048 Muffler Plate
50 B-609023 Roll Pin
51 A-109049 Muffler Spring
52 A-905055 Spring Washer (4)
53 A-109050 Hex Bolt (2)
54 A-109051 Hex Bolt (2)
55 A-107039 Dead Handle
56 A-107042 Spring Washer
57 A-107049 Washer
58 A-109052 Throttle Valve Lever
59 A-109053 Lock Key
60 A-109054 Lock Spring
61 A-109055 Set Bolt
62 P-000034 O-Ring
63 R-852024 Spring Washer (2)
64 A-905031 Hex Bolt (2)
65 A-109056 Pin
66 A-109057 Spanner
67 A-109058 Spanner
68 A-109059 Allen Wrench (M4)
69 A-109060 Allen Wrench (M5)
70 A-109061 Allen Wrench (1/4)

cannot move during the grinding process.
33) If the grinder is dropped do not use unless the wheel is first checked
for damage by a competent person.
34) When not in use the grinder should be stored in a safe place where
it will not be damaged. If a tool has not been used for a period of time
check the tool as for the first time of using.
35) Be aware that if the grinding process causes high vibration, special
precautions should be taken.
36) The operator should be aware that the grinding wheel will continue
to rotate after the power supply has been shut off. This could cause a
hazard.
37) Always store grinding wheels in accordance with the
manufacturer’s instructions.
38) Check frequently that the spindle thread has not become damaged
or worn.
39) Always ensure that the grinding wheel has a higher permissible
running speed to the speed of the grinder.
Distributor
Page No 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 UT919C 9“ Vertical Grinder, 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 Parts 1 & 4, Pneurop PN8NTC1
following the provisions of
89/392/EEC as amended by 91/368/EEC & 93/44/EEC Directives
Place and date of issue Name and signature or equivalent marking of authorised person
Lane End D.H.Moppett (Man Director)
This document may not be copied wholly or in part by anyone without the consent of the Directors of Universal Air Tool Company Limited
©Copyright of Universal Air Tool Company Limited, established in the United Kingdom, 1994
Designed & Written in the U.K.
Notes