Universal Air Tools UT8744 - Manual (Page 2)

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 than the pad,
and not smaller than the pad.
Dismantling & Assembly Instructions.
Disconnect tool from air supply.
Grip the motor housing (1) in a vice fitted with soft jaws and
locate peg spanner provided in the two holes in nut (55) and the
open ended spanner provided on collar (33). Unscrew nut (55),
remove any abrasive disc fitted and unscrew pad (54) by hand.
Unscrew dead handle (3) complete with handle grip (4). Exhaust
deflector assembly may be removed from handle grip (4). Drive
out pin (6) and remove locking lever (7). Do not dismantle
locking lever (7). Unscrew hose adaptor (20) and it is
recommended that O-ring (37), handle (19) and handle grip (18)
are not removed unless replacements are required. Plug (2) may
be removed from housing (1).
Unscrew valve screw (53) with O-ring (52) and take out air
regulator (50) with O-ring (51), spring (49) and valve stem (47)
with O-ring (48). O-ring (48) may be removed from valve stem
(47).
Unscrew clamp nut (34) [left hand thread] from motor housing
(1) complete with the gearbox assembly. Grip the clamp nut and
gently tap the threaded end of idler gear cage (44) [so as not to
damage the thread] and remove the assembly from the clamp
ring.
Take off collar retaining ring (32) and pull off collar (33) and
remove key (43) and pull off bearings (36) and (42), ring gear
(38) and idler gear cage washer (46) from idler gear cage (44).
Oil seal (35) may be removed from clamp ring (34).
Push out 2 off pins (39) and slide out 2 off idler gears (41)
complete with 2 off needle bearings (40) - note eleven needles
per set.
Remove retaining ring (31) from rotor (25) and take off pinion
(30). The sander is fitted with an additional collar part (61).
Grip front end plate (28) by hand and with a non metallic or soft
metal (lead or aluminium) hammer, tap the splined end of the
rotor (25) to drive it through the front end plate and bearing
assembly. Take off cylinder (27) noting its orientation to the front
and rear end plates for reassembly and take out 4 off rotor
blades (24) from rotor (25). Prise out bearing cap (21) and take
off retaining ring (22) from rotor (25). Support the rear end plate
(23) in a piece of tube with a bore diameter slightly larger than
the largest diameter of the rotor and tap the non splined end of
the rotor to drive it through the rear end plate and bearing
assembly.
With a suitable punch tap out bearing (45) from front end plate
(28) and bearing (29) from rear end plate (23).
Reassembly
Clean all parts and examine for wear. Look in particular for wear
and cuts on O-rings. Coat all parts in a pneumatic tool lubricating
oil, preferably one including a rust inhibitor. Grease all bearings
and gears with a molybdenum or lithium based general purpose
grease and reassemble in the reverse order. See following
notes.
Motor Assembly
If fitting a new rotor very lightly deburr the edges of the rotor
slots. Make sure rotor blade slots are clean. Make sure that the
faces of the front and rear end plates (28) and (23) that abut
cylinder (27) are free from burrs and surface marking. If
necessary lap faces on a flat, very fine grade of abrasive paper.
Press bearing (45) into end plates (28) and bearing (29) into
plate (23). Support bearing (29) in rear end plate on the inner
race and tap rotor on the gear end with a soft metal or non
metallic hammer until the rotor locates against the face of the
rear end plate. Support the inner face of the rear end plate in a
piece of tube with a bore diameter as close as possible to the
largest diameter of the rotor and tap the non splined end until a
clearance of .040mm (0.0015”) to .065mm (0.0025”) is
obtained between the inner face of the rear end plate and the
rotor. This clearance to be checked when pulling the rotor by
hand away from the rear end plate and bearing assembly.
Spin rotor to ensure that it will spin freely in the rear end plate
and bearing assembly. Fit rotor blades and cylinder ensuring that
the pin in one end of the rotor cylinder locates in the round hole
in the rear end plate. Push on front end plate and check that
rotor still rotates freely.
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. The tool incorporates an air
regulator to reduce the speed of the tool if required.
Page No 2
Safety Rules For A Sander/Polisher
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