Universal Air Tools UT8704 - Manual (Page 2)

Page No 2
Operating
Select a suitable abrasive belt of the required grade to achieve
a fine sanded finish or high metal removal. The belt size for this
tool is 30 mm wide x 540 circumference (continuous belt) and
is available in various grades, the lowest is grade 40 grit which
is coarse for high material removal and grits are available as 40,
50, 60, 80, 100 and 120. The coarseness of the grit decreases
as the grade number increases, hence 40 is coarse and 120
very fine.
To fit a belt, press down the stopper and push the idle pulley
towards the tool until the stopper clicks into place which
releases the tension and holds the tension off the belt. Fit the
belt ensuring that it sits centrally on the drive pulley and the idle
pulley. Release the stopper to tighten the belt. Start the tool
slowly and use the adjusting screw (46) to align the belt
centrally.
Apply the sander lightly to the work and allow the belt to cut.
Take great care when sanding around sharp edges and corners
to avoid snagging and belt damage or breakage. It is always
recommended to use safety glasses and a breathing mask. The
sanding of certain materials may create a hazardous dust which
may require special breathing equipment. Check before using
the tool.
Even if the tool has a low noise level, the actual sanding process
may create a noise such that hearing protectors should be worn.
If there are sharp edges on the material being sanded then
safety gloves are recommended.
Do not continue to use belts that are clogged or worn as this
will make the sanding process inefficient and the need to apply
unnecessarily high loads to the tool.
Only use belts of the dimensions specified. To use an incorrect
belt will either cause it to break or fly off. Both occurrences
could be dangerous.
Dismantling & Assembly Instructions
Disconnect tool from air supply.
Remove side handle (49) or side handle (49) and bracket (48) by
taking out 2 off screws (38). Lift cover (28), press down stopper
(33) to reduce tension on the abrasive belt and push on idle
pulley (42) to remove belt.
Remove cap screw (38) and washer (37) to take off shoe (36).
Take out 2 off screws (38) to remove finger plate (47). Take out
idle shaft screw (45) to release idle pulley assembly. The idle
pulley assembly may be dismantled by tapping out bearings (43)
from either side of idle pulley (42) releasing collar (44).
Drive out pin (29) to remove wheel cover (28). Take out 2 off
capscrews (31) to remove cover latch (30). Pull out apron (32).
Belt alignment countersunk screw (46) may be removed if
replacement required.
Drive out stop pin (40) and pull out tension arm (41) and spring
(39). Drive out roll pin (35) to release stopper(33) and stopper
spring (34).
Insert rod in hole in drive pulley (23) to prevent rotation and
unscrew nut (25) with washer (24). Take off drive pulley (23).
Note how drive pulley (23) locates on pin (20) in rotor (18).
Unscrew cap screw (26) to remove wheel cover (27). Unscrew
air inlet (11) from motor housing (1) and take off deflector (10).
Drive out pin (9) to remove lever (8). Unscrew valve body (7)
and take out O-ring (6), O-ring (5), valve stem(4) with O-ring (3)
and spring (2). Unscrew motor nut (12) from motor housing (1)
with O-ring (13). Tap carefully, so as not to damage the thread,
rotor (18) to remove the motor assembly from motor housing
(1). Pin (20) can be taken out of rotor (18). Note how pin (16) in
cylinder (17) locates the motor assembly in the groove in motor
housing (1) and that the pin (16) is at the rear end plate (15) end.
Hold motor assembly and again tap the threaded end of rotor
(18) to drive it through the front end plate (15) and bearing (22)
assembly. Bearing (22) may be tapped out of front end plate
(15). Take off cylinder (17) and 5 off rotor blades (19). Support
the rear end plate (15) in a piece of tube with a bore diameter
as close as possible to the maximum diameter of rotor (18) and
tap the non threaded end of rotor (18) through the rear end plate
assembly. Tap out bearing (14) from rear end plate (15) and
take out O-ring (21) from motor assembly (1).
Reassembly
Clean all parts and examine for wear, particularly O-rings,
bearings and rotor blades. Use only distributor or manufacturer
supplied spare parts. Pack all bearings with a general purpose
grease and reassemble in the reverse order. Refit belt and adjust
alignment using screw (46).
Safety Rules For A Sander
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.