Universal Air Tools UT8880RD - Manual (Page 2)

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 drill from air supply.
These two models are identical except for the gearbox drive.
If fitted first unscrew dead handle (9) and remove clamp ring(8).
Grip the motor housing (43) in a vice fitted with soft jaws, hold drill
chuck (1) and unscrew chuck screw (10). Fix chuck key securely in drill
chuck (1) and give the chuck key a sharp tap with a hammer in a
direction so as to loosen a right hand thread. If this fails to remove the
chuck as it is too tightly fitted, then see later.
For 2000 RPM Model UT8825D
If drill chuck has not been previously removed, unscrew clamp nut (3)
from motor housing (43) complete with the gearbox assembly. Take
out internal gear (24) and 3 off gears (23). Wedge a rectangular section
bar between the three pins in reduction spindle (22) and then unscrew
the drill chuck (1). Remove chuck spacer (2) and push out work spindle
(22) from the front end. Pull off 2 off bearings (18) and washer (19) from
work spindle (22).
For 800 RPM Model UT8880RD
If drill chuck has not been previously removed then proceed similarly to
the instructions above.
Unscrew clamp nut (5) from motor housing (43). Take off chuck spacer
(2) and push out the internal gear assembly by pushing work spindle
(53) from the front end. The complete internal assembly comprising of
2 off ball bearings (18), outer collar (6), washer (19) inner collar (7), 2 off
internal gears (24), 6 off gears (54), pinion gear (56), work spindle (53)
and reduction spindle (55) may be separated.
Note: Do not attempt to remove the 3 off pins from the reduction
spindle (55) or work spindles (22) or (53) from either speed range. The
pins have a nominal diameter of 0.1574 (4mm). Replace the complete
reduction or work spindle assembly if the diameter of the pins wears to
below 0.155" (3.937mm).
From this point the dismantling is the same for
both models.
Pull out the motor assembly, complete with pin (31) and take out motor
gasket (44) from motor housing (43). Grip the spacer (25) and front end
plate (27) by hand and tap the splined end of the rotor (28) with a non
metallic or soft metal (lead or aluminium) hammer to drive the rotor
through the components being held. Take out 4 off rotor blades (29)
from rotor (28) and take off cylinder (30). Take off retaining ring (33)
from rotor (28). Support the rear end plate (27) in a piece of tube with a
bore diameter as close as possible to the maximum diameter of the
rotor and tap the non splined end of the rotor to drive the rotor through
the rear end plate (27) and bearing (26).
Unscrew air inlet (47) complete with screen (48), take out 2 off screws
(46) and remove exhaust diffuser (45).
Drive out pin (42), grip trigger (35) and pull out the complete inlet and
reverse valve assembly.
Note: Make sure that reverse lever is correctly aligned with the mid
position of the slot in motor housing (43). Take out O- ring (41) from the
bottom on the valve bore in motor housing (43).
Unscrew set screw (34) and it is then possible to separate trigger (35),
valve spring (49), reverse bushing (40), valve stem (36) and reverse
lever assembly (39). O-ring (37) may be prised off of valve stem (36)
and O-ring (38) off of reverse lever assembly (39).
Note: Do not remove rubber cushion (50) and steel ball (51) from
reverse lever assembly (39) and note that when reassembling the
inlet/reverse valve assembly that O-ring (41) is repositioned in the
motor housing trigger bore and slot in the reverse bushing (40) is lined
up with pin hole for pin (42) in motor housing (43).
Reassembly
Clean all components and examine for wear. Look in particular for wear
and cuts on O-rings, wear on rotor blades, gear and clutch
components. Coat all parts with a pneumatic tool lubricating oil and
grease all bearings, gears and clutch parts with a molybdenum or
lithium based general purpose grease.
Before reassembling the motor make sure that the faces of end plates
(27) that abut cylinder (30) are flat and free from burrs. If necessary lap
on a flat very fine grade of abrasive paper. Reassemble in the reverse
order. When refitting the complete motor assembly to the housing (43)
first make sure that the assembly is clamped tightly together and the
rotor spins freely, slide the assembly with gasket into the housing (43)
ensuring that motor pin (31) locates in the motor assembly and in the
hole in the bottom of the main bore of housing (43) situated between
the two main ports.
(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.
Page No 2
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.
8) Use safety equipment as recommended.