Universal Air Tools UT8807B-1/2 - 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 tool from air supply.
To remove the drive chuck (2) first open the chuck jaws with the key
provided and remove chuck screw(1) [left hand thread]. Place chuck
key securely into chuck and give the key a sharp tap so as to unscrew
a right hand thread. Grip motor housing (40) in a vice with soft jaws
on the flats at the rear end. Drive out pin (43) and take off throttle lever
(42). Unscrew inlet bushing (51) together with screen (52). With a
needle pointed tool, prise out deflector retainer (50), pull out deflector
(48) and remove O-Ring (49) from deflector (48). Unscrew 2 off
screws (47) and take off body cap (46), muffler (45) and gasket (44).
Unscrew valve screw (29) together with O-Ring (30) and reverse
retainer (31) and take out spring (32) and pull out valve pin (36), valve
(34), O-Ring retainer (33) and O-Ring (35).
Pull out reverse valve (37) and take out spring (38). Do not remove
either of the brass bushes in the motor housing (40) unless
replacements are required. If necessary reverse bush (39) can be
taken out of motor housing (40) by first removing pin (41). With circlip
pliers remove retaining ring (3) and pull out the output spindle
assembly. Unscrew nut (9), remove washer (8), bevel gear (7) and
key (5). Drive spindle (4) through bearing (6). Tap out needle bearing
(10) from angle head (11) but do not remove grease plug (12) unless
a replacement is required.
Slacken lock ring (15) and then unscrew angle head (11) [left hand
thread] from main assembly. Take out gear drive assembly and
dismantle by pressing pinion gear (13) through 2 off bearings (14).
Unscrew completely lock ring (15) and take out planet gear with pins
assembly (16), 3 off idler gears (17) and internal gear (18). Pull out the
motor assembly, complete with cylinder pin (25) from motor housing
(40).
Grip the front end plate (20) by hand and with a non metallic or soft
metal (lead or aluminium) hammer tap the splined end of the rotor
(21) to drive it through the front end plate (20) and bearing (19)
assembly. Tap out bearing (19) from front end plate (20). Remove
cylinder (23) and take out four off rotor blades (22) from rotor (21).
Take off retaining ring (28) from rotor (21) and support rear end plate
(24) in a piece of tube with a diameter as close as possible to the
maximum diameter of the rotor and tap the non splined end of the
rotor to drive it through the rear end plate (24) and bearing (27).
Take out motor gasket (26) from motor housing (40).
Reassembly
Clean all component parts and examine for wear before
reassembling. Use only manufacturer or distributor supplied parts.
Check in particular for wear on bevel gears, O-Rings and rotor blades.
Lightly coat all parts with a suitable pneumatic tool lubricating oil,
preferably one incorporating a rust inhibitor. Pack bearings and grease
gears and bevel gears with a lithium or molybdenum based general
purpose grease. Reassemble in the reverse order taking note of the
following:
1) When fitting gasket (26) make sure that it does not cover the ports
and is positioned correctly.
2) Make sure that the motor locating pin locates correctly in the holes
in the motor end plates and in the small hole between the two ports
at the bottom of the main bore of the motor housing.
3) Check the diameter of the pins in planet gear with pin assembly
(16). If the diameter of these pins falls below0.155" (3.93mm) replace
the assembly.
4) For the motor assembly, ensure that the motor end plates that abut
the cylinder are flat and free from burrs and sharp edges. If necessary
lap the faces on a very fine grade of abrasive paper laid on a flat
surface. Set the clearance between the rear end plate and the rotor
with the components pulled apart by hand to be between 0.0015"
(0.040mm) and 0.0025" (0.065mm).
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.
9) The tool is not electrically insulated. Do not use where there is a
possibility of coming into contact with live electricity, gas pipes, water
pipes, etc. Check the area of operation before performing the
operation.
10) Take care against entanglement of moving parts of the tool with
clothing, ties, hair, cleaning rags, etc. This will cause the body to be
moved towards the work process and can be very dangerous.
11) Do not attempt to hold or guide the drill chuck when the tool is
running. Keep hands clear of the drilling process.
12) Use only compressed air at recommended conditions.
13) Do not attempt to fit attachments, i.e. for sawing, hedge cutting,
grinding, chain sawing, etc.
14) If the tool appears to malfunction remove from use immediately