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 12,000 RPM.
Check that item (5) disc receiver is the
correct type as parts list and 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.
Do not over tighten as this could crack the
wheel. 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 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 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
Disconnect tool from air supply.
Grip gear shaft (11) with spanner (41) and
insert spanner (40) into the holes in disc
nut (4), unscrew disc nut (4) and take off
grinding disc (34) and disc receiver (5),
remove 4 off screws (37) and take off disc
cover (3), retainer (7) and gasket (8).
Pull out the drive shaft assembly from
body (1). Unscrew grip (6) from body (1)
and remove 2 off screws (16) and take off
exhaust cover (48).
Remove spacer (14).
Support bearing (14) and tap the non
threaded end of the gear shaft (11) to
drive it through the bearing (14).
Take off retaining ring (13) from gear shaft
(11) and support bearing (9) on the
threaded shaft side and press the non
threaded end of gear shaft (11) through
the assembly to separate gear shaft (11),
key (12), bearing (9), bevel gear (10) and
wave washer (43).
By holding body (1) in a vice fitted with
soft jaws the control head assembly may
be removed from body (1) by unscrewing
lock ring (50). It is then possible to pull out
the motor and governor assembly from
the body (1).
Pull off pinion assembly from motor
assembly and press apart pinion (15) and
bearing (18).
Grip the front plate (20) by hand and with
a non metallic or soft metal (lead or
aluminium) hammer tap the splined end of
rotor (24) to drive the rotor and the
remainder of the motor and governor
assembly through the front plate and
bearing assembly.
Take off the cylinder (23) noting its
orientation for reassembly and take out 4
off rotor blades (25) from rotor (24).
Spring pin (22) may be pulled out of
cylinder (23) if a replacement is required.
Grip rotor (24) in a vice with soft jaws and
unscrew the governor assembly from the
rotor - left hand thread.
Support the rear end plate (26) in a piece
of tube with a bore as close as possible to
the maximum diameter of the rotor and
very carefully so as not to damage the
thread, tap the rotor through the rear end
plate (26) and bearing assembly.
With a suitable punch tap out bearing (17)
from rear end plate (26) and bearing (17)
from front plate (20).
To dismantle the governor assembly first
unscrew adjust screw (42) assembly.
Take off spring (28). Drive out 2 off spring
pins (47) and take out 8 off pendulums
(45) from governor (44).
When removing the pendulums take
special note of the orientation to the
governor (45) to ensure they are fitted the
same way on reassembly.
This is very important.
Grip valve housing (56) in a vice and
remove O-ring (39) from lock ring (50).
Drive out pin (58) and take off safety
throttle lever (60).
Do not dismantle the throttle lever (60).
Unscrew bushing (57).
Unscrew valve nut (52) and remove with
O-ring (53), spring (54), valve (59) and O-
ring (55).
Unscrew coupling nut (51) - left hand
thread - from valve housing (56) and
unscrew lock ring (50) from coupling nut
(51) and unscrew lock ring (50) from
coupling nut (51).
