Trelawny TCG 250, Operation And Maintenance Manual

www.trelawny.co.uk

maintenance

Grinding Block Replacement 

Switch off the engine-powered versions and allow the 

engine to cool completely, disconnect electric-motor-
powered versions from its power supply

. Place the machine 

on a flat and level surface. Raise the front skirt by loosening 

the four 10mm guard retaining bolts on either side of the 
machine and slide the guard up to the top of the slots, tighten 
the bolts temporarily.

Electric Machines

Tilt the machine backwards to rest on its handle bar.
Place a heavy object (10kg sand bag, etc.) across the upper 
part of the handle bar or tie down for additional security.
Take note how the grinding blocks and wedges have been 
assembled, using a suitable wooden drift, knock out the 
grinding block, not the wooden wedge. Dispose of the used 
grinding blocks according to local legislation. 
Fit each new grinding block squarely into the grinding plate 

location corner at the outer flat face of the grinding disc.

Secure with a new wooden wedge, between the block and 
the inner face of the grinding block, knock the wedge into 
position using a suitable drift.

Note:

Do not use a mix of old and new grinding blocks, this will 
cause rapid wear of the new blocks and could cause the 
machine to become uncontrollable, unstable and dangerous 
in use. Re-adjust the lower guard and tighten the bolts.

Petrol/Gasoline Machines

Switch off the engine-powered versions and allow the engine 

to cool completely, disconnect electric-motor-powered 
versions from its power supply.

Place the machine on a flat and level surface.

Raise the front skirt by loosening the four 10mm guard 
retaining bolts on either side of the machine and slide the 
guard up to the top of the slots, tighten the bolts temporarily.
It is not recommended that petrol/gasoline-powered 
machines are tilted back such that they rest on their handles.  
This may cause leakage of fuel and is therefore a hazardous 
operation.

Remove the four countersunk M12 screws from the disc, 
ensuring that the disc is supported as the last two are 
removed. The disc now will come away from the drive plate.
Dispose of the used item according to local legislation.

Offer the new disc up to the drive plate and align the holes. 
Loosely fit the four bolts and then tighten in a diagonal 

sequence to 40lb/ft. Re-adjust the lower guard and tighten 
the bolts

Brush Seal Replacement

The machine is fitted with a flexible brush seal which will 

need replacement from time to time to maintain the efficiency 
of the dust control system. Follow the first five steps from the 

above procedure for changing discs. Drill out rivets and to 
remove the brush simply grasp one end and pull, the brush 

will come off the guard. To fit the new brush, align one end of 

the brush with the end of the guard and use a suitable drift to 
knock the brush onto the metal guard, working along until it  

is securely fitted.

operating range