Universal Air Tools UT8784 - Manual (Page 2)

Page No 2
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 90lb p.s.i./6.3 bar. The tool can run at lower
and higher pressures with the maximum permitted working air
pressure of 100 lbs p.s.i./7 bar.
Operating
Select a suitable abrasive disc (see Section "Foreseen use of the
tool") and make sure that it is fixed securely to the tool. Connect
to suitable air supply as recommended. Make sure that the side
handle is tightened securely.
Apply the sander lightly to the work and allow the abrasive disc
to cut. Take great care when sanding around sharp edges and
surfaces to avoid the disc snagging i.e. the disc may be brought
to an abrupt stop or considerably slowed that will cause the tool
to kick in the hands.
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 machine has a low noise level
the actual sanding process may cause a noise level such that
ear protectors will be required. If there are sharp areas on the
material being sanded safety gloves are recommended.
Do not continue to use abrasive discs that are worn or clogged.
This will make the sanding process inefficient and the need to
apply unnecessarily high forces to the tool.
Do not use undersized or oversized sanding discs. The disc
should be no more than 1/4" larger in diameter that the pad,
and not smaller than the pad.
Dismantling & Assembly Instructions
Disconnect tool from air supply.
Grip spindle (21) with the spanner provided and grip the pad
(40) and unscrew this together with pad nut (43) and abrasive
disc. Remove side handle (28).
Grip motor housing case (1) on the flats at the rear end and
unscrew lock ring (23) with a suitable peg spanner and pull out
spindle (21) together with key (22), bearing (18), gear (25) and
bearing (26). Support bearing (18) and tap spindle through
assembly to release key (22), bearing (18), bearing (26) and
gear (25).
Drive out pin (3) to release locking lever (2). Do not dismantle
locking lever. Unscrew inlet bushing (50) [not shown] together
with screen (44). With a sharp needle pointed tool, lever out
retainer ring (42). Take out exhaust sleeve (41) and remove
O-ring (24) from exhaust sleeve (41).
With a wide bladed screwdriver, unscrew valve nut (10) and
remove O-ring (9), O-ring (7), air regulator (8), spring (6), throttle
valve (4) and O-ring (5).
Unscrew cap (29) to release the remaining angle housing
assembly. Remove coupling (36) and roll pin (49). Roll pin (49)
may be driven out of coupling (36). Unscrew cap lock (30)
together with O-ring (48). Grip lock nut (35) and pull out the
motor assembly from the housing case (1).
To dismantle motor assembly, grip motor assembly and tap rear
end of the rotor (15) through the rear end plate (12) and bearing
(11) assembly. Make a note at this time of the orientation of end
plates (12) and (19) to cylinder (14). Remove cylinder (14), 2 off
roll pins (13) and 4 off rotor blades (16) from rotor (15). In a vice
with soft jaws grip rotor (15) and unscrew lock nut (35). Rotor
(15) may then be tapped through bearing (20), shim (45), collar
(17) and front end plate case (19). Roll pin (47) may be removed
from front end case (19) and bearing (20) tapped out of front
end case (19) and bearing (11) tapped out of rear end plate (12).
Grip angle housing (27) in a vice with soft jaws and with a stiff
rod passed through the holes in pinion bearing nut (37) unscrew
pinion bearing nut and remove spacer (33) and pinion assembly.
Unscrew nut (35) from pinion (31) and remove bearing (32) and
spacer (34).
Reassembly
Clean and examine all parts for wear and replace only with
manufacturer supplied parts. Ensure that the faces of the motor
end plates that abut the cylinder are flat and free from burrs. Lap
on a flat, very fine grade of abrasive paper if necessary. Check
O-rings for cuts and wear. Lightly coat all parts with oil, pack
bearings and pinion and gear with a lithium or molybdenum
based general purpose grease and reassemble in the reverse
order. Note:- When assembling motor assembly into the main
case ensure that the pin in the side of the front end case locates
in the groove in the front end of the case. Pour 5ml of a suitable
pneumatic motor lubricating oil (preferably one incorporating a
rust inhibitor) into the air inlet and connect to a suitable air
supply.
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.
19) Always check the speed of the attachment is higher than the
speed of the tool.
20) Check speed of tool at regular intervals.
21) Check always that the material to be sanded may not cause
a risk by being sanded, i.e. fire or explosion.
22) If self fixing discs are used, i.e. self adhesive or velcro,
always ensure the disc is fixed centrally to the pad.