OPERATION
Putting into service
Remove plastic bung from air inlet using
a pair of pliers.
Use a clean lubricated air supply that will
give a measured air pressure to the tool
of 6.3bar (90psi). It is recommended a
air filter/regulator/lubricator is used which
can be obtained from air tool supplier.
Operating
With the grinder correctly connected to
the air supply, check the speed of the
grinder with an inlet pressure of 100
psi/7.0 bar measured at the tool inlet.
Check with a calibrated tachometer.
Check that the guard is in position and
securely fixed.
Check that the grinding wheel is of correct
dimensions, is not cracked or chipped and
has a permitted speed rating higher than
the maximum permissible running speed
of the grinder which is 7,000 RPM.
Check that it is screwed tightly to the shaft
and locates the bore of the grinding wheel
on the spigot of the disc receiver and
screw on disc nut item (4) using the
spanners provided. It should be tight
enough to prevent wheel spin off when
the air supply is shut off.
When first starting the grinder with a new
or changed wheel fitted, the grinder
should first be started in a protected area,
i.e. such as under a heavy bench well
away from other persons and run for, say,
one minute.
This will provide protection if the wheel
should break because of a fault that was
not visibly detected
Always use eye protection and wear
protective gloves if there are sharp edges
in the working area.
The tool and the grinding process can
create a noise level such that ear
protectors should be worn.
If the grinding process creates a dust then
use a suitable breathing mask.
Check that the material being worked will
not cause harmful dust or fumes. If this is
so then special breathing apparatus may
be required. Seek advice before starting
work.
If the grinder vibrates when first fitting the
wheel or during use, remove from service
immediately and arrange for the fault to
be corrected before continuing to use.
Do not apply excessive pressure as this
will reduce the cutting efficiency.
Apply light loads and allow the wheel to
cut.
Handle the grinder with care.
If the grinder is dropped, carefully
examine the wheel for damage and
replace if necessary.
Start the machine as if for the first time of
fitting a wheel, i.e. under a bench.
Make sure the object to be ground is in a
firm fixed position.
Dismantling & Assembly
Instructions
This tool has an output shaft with 5/8
UNC thread shaft.
Disconnect tool from air supply.
To dismantle, insert the peg spanner (70)
into disc nut (4) and with a spanner (38)
on the flats of gear shaft (10) unscrew
disc nut (4), take off disc (49) and
unscrew disc receiver (5).
Remove cover screw (50) and nut (51)
and take off disc cover (3). Unscrew side
handle (52).
Grip the valve body (58) in a vice fitted
with soft jaws and take out head screw (2)
and screw (55) and with a suitable peg
spanner unscrew [left hand thread]
bearing screw (27).
Grip gear shaft (10) and pull out the bevel
gear drive assembly. Remove ring (12)
and support bearing (8), bevel gear (9),
wave washer (13) and key (11).
Through the small hole in body (1A) tap
out spacer (6) and bearing (7) with a small
punch.
Take out capscrew (56) to remove
exhaust deflector (57). Take out 4 off
screws (29) with lockwashers (30) and
take off valve body assembly and gasket
(48).
Pull out the motor assembly complete
with bevel drive and governor assembly
from body (1A).
To dismantle this assembly remove
retaining ring (20) and pull off bevel pinion
(17) with bearing (16).
Grip splined end of the rotor (24) carefully
so as not to damage the splines and
unscrew [left hand thread] the governor
assembly by using a spanner on the flat
sides of governor (32).
Hold front case (21) and with a non
metallic or soft metal [lead or aluminium]
hammer so as not to damage the splines,
tap rotor (24) through the front case and
bearing assembly.
Pinion (17) may be pressed out of bearing
(16) and bearing (15) tapped out of front
case (21). Take off cylinder (22) but do
not remove the 2 off pins from cylinder
(22) unless replacements are required -
note orientation of cylinder (22) to front
case (21) and rear case (26) for
reassembly. Remove 4 off rotor blades
(23) from rotor (24).
Support rear case (26) in a piece of tube
with a bore 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 case and bearing
assembly. Tap out bearing (15) from rear
case (26).
To dismantle the governor assembly
unscrew adjust nut (18), remove spring
(35) and take out plunger (33) and adjust
screw (19) assembly.
These two items (33) and (19) should not
be dismantled and are only available for
spares as an assembly.
Drive out 2 off spring pins (37) and take
out 6 off pendulums (31) from governor
(32).
When removing the pendulums from the
assembly take special note of the
orientation to ensure that they are
assembled in the same way on
reassembly. This is Important.
To dismantle the valve body assembly
unscrew hose adaptor (64), drive out pin
(60) to remove lever (59).
Remove retaining ring (63) and take out
lock pin (62)and spring (61).
Unscrew valve screw (65) and take out O-
ring (66), spring (67) valve stem (68) and
O-ring (69).
