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.
The drill chuck (42) may be removed from the assembly by securely
placing the chuck key in the chuck, covering the chuck and key with a
cloth and striking the chuck key a sharp blow in the direction to loosen
a right handed joint, i.e. the direction of rotation of the tool to take off
chuck spacer (37).
Remove handle bracket (39) and dead handle (41) by unscrewing
handle and unscrew cap screw (38) with nut (40).
Place the tool in a vice fitted with soft jaws on the flats of housing (6) with
housing cover (1) with the handle section pointing upwards. Unscrew
hose adaptor (2) and remove 2 of screws (3) and take off muffler
diffuser (4). Unscrew lock ring (36) and pull out gear assembly being
careful not to loose key (25) with motor assembly from housing (6) with
housing cover (1).
To dismantle the gear assembly, grip the threaded shaft and pull it out of
internal gear (26). 2 of ball bearings (33) may be pressed out of internal
gear (26). Support ball bearing (33) on the gear side in a piece of tube
and carefully, so as not to damage the thread, tap the end of spindle
(31) to apart reduction spindle (29) with idler gears (28) and to drive it
through the bearing.
Take off inner collar (35), outer collar (34), and seal plate (32).
Push out 3 of idler gears (30) and (28) from spindle (31) and reduction
spindle (29).
Whenever replacement is needed, 6 of cages will be dismantled from
idler gear (30) and (28).
To dismantle the motor assembly, prise out bearing cap (15) and
remove retaining ring (16).
Grip the front plate (23) by hand and with a non metallic or soft metal
(lead or aluminium) hammer, tap the splined end of rotor (20) to drive it
through the front end plate and bearing assembly.
Remove the cylinder (22) noting its orientation to front plate (23) and
rear plate (18) for
reassembly and remove 5 of rotor blades (21) from rotor (20). Support
the rear plate (18) on a piece of tube with a bore diameter just larger
than the maximum diameter of the rotor and tap the non splined end of
the rotor to drive the rotor through the rear end plate and bearing
assembly.
With a suitable punch, drive out ball bearing (17) from rear plate (18)
and ball bearing (24) from front plate (23). Do not remove pins (19)
from end plates (23) and (18) unless replacements are required.
Drive out roll pin (5) slowly and carefully so as not to damage the seals,
grip the trigger (13) and pull out the control valve assembly. Unscrew
set screw (14) and take off trigger (13) from valve stem (9).
Remove spring (12) and slide valve stem (9) through valve bushing (10).
Remove o-ring (7) from valve stem (9) and o-rings (11) and (7) from
valve bushing (10). Take off o-ring from housing (6).
Reassembly
Clean all component parts and examine for wear before reassembling.
Use only manufacturer or distributor supplied spare parts.
Check in particular for wear and cuts on o-rings and wear on rotor
blades.
Lightly coat all parts with a suitable pneumatic tool lubricating oil,
preferably one incorporating a rust inhibitor. Pack all bearings and
gearbox with a lithium or molybdenum based general purpose grease
and reassemble in the reverse order (see below).
For the motor assembly ensure that the front and rear end plates that
abut the cylinder are clean and free from burrs and surface marking. If
necessary, lap faces that abut the cylinder on a flat fine grade of abrasive
paper. Press bearings into front and rear end plates, support the bearing
in the rear end plate on its inner ring and tap the rotor on its splined end
with a soft metallic hammer into the bearing until the rotor locates
against the rear end plate. Support the inner face of the end plate as
close as possible to the largest diameter of the rotor and tap the non
splined end of the rotor until a clearance of 0.0015" (0.040mm) -
0.0025" (0.065mm) is obtained between the inner face of the rear
plate and the rotor. This clearance should be checked when pulling the
rotor away from the rear plate and bearing assembly. Spin rotor to
ensure that it will rotate freely in the rear end plate bearing. Locate the
cylinder by the locating pin to the rear plate checking that the ports in
the rear end plate match with those in the cylinder. Insert the five rotor
blades into the rotor and locate correctly the front plate to the cylinder
using the locating pin. Ensure that the rotor will spin freely in the
assembly. This is best checked by placing the motor assembly in a vee
block and squeezing the front and rear end plates against the cylinder.
Fit retaining ring (16) and insert rear bearing cap (15) into rear plate (18).
Disconnect the air line and pour into the intake bushing a teaspoonful
(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.