Trelawny 735.7072, Operation And Maintenance Manual, Page: 5 / 14

OPERATION
Pre-Start Check (Daily)
Check all bolts and screws for
tightness.
Ensure that all fittings are secure.
Check condition of hub or drum
assembly and replace flaps, cutters or
axles if required.
The air motor speed is preset at the
factory to 10,000 rpm (free running).
Always clear the air hose before
connection to the machine.
E n s u r e t h a t n o m o i s t u r e
(condensation) is present in the air
hose.
Check the security of all hoses clamps
and fittings, and that the air pressure is
correct at 90psi (6.2bar). The air motor
uses approximately 10cfm of air.
The Maximum air pressure is 100psi
(7bar) the air consumption will
increase as the air pressure rises.
It is recommended that the
compressor is capable of supplying at
least 30cfm supply of free air (not
displaced, as given by some
compressor manufactures).
In particularly cold weather it is
recommended that a proprietary anti-
freeze lubricating oil is used.
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 10,000 RPM.
Check that item disc receiver 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 (40) 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 worked on is
in a securely fixed position.
Dismantling & Assembly
Instructions
The dismantling and assembly will
require some special tools, which can
be produced by any machine shop.
Special tools required are:
1 x 5.0mm x 50mm bar.
1 x 7.75mm x 50mm bar.
1 x Ø8.5mm x 50mm bar.
1 x Ø9.2mm x 150mm bar.
1 x Ø11.8mm x 50mm bar.
1 x Ø10mm Ø6.2mm bore x 25mm
long tube.
2 x Ø15.0mm tubes x Ø8.2 bore x
25mm long.
1 x Ø21.5mm tube x Ø16.0mm bore x
50mm long.
1 x Ø21.9mm x 50mm tube x Ø14mm
bore.
Using these tools during assembly will
prevent damage to the bearings.
Disconnect tool from air supply.
Remove the side handle (54) by
unscrewing anti-clockwise from the
body (1).
Dismantling the Gear housing
Press in and hold locking button (60) to
lock the spindle Insert spanner (55) into
the holes in disc nut (40), unscrew disc
nut.
Take off grinding disc and disc receiver
(38), remove circlip (71) and take off
disc cover, and remove indexing clip
(69) and spring (68).
Unscrew and remove the set screw (61)
from the housing using a 2.5mm Allen
key.
The spindle stop button can now be
removed as an assembly comprising of
components 56, 57, 58, 59 and 60.
Use a 4mm Allen key and remove the
4 x M5 screws (43) from the gear
housing (36).
Pull out the drive shaft assembly from
gear housing (23).
Remove spacer (26), taking note of its
orientation.