With reference to the colour coded illustration on Page 6 of the TMC26 Operators Manual Booklet
Engine, Clutch, Belt & Chains
Honda GX200 parallel ¾” keyed shaft 6.5 HP engine fitted with a solid steel twin shoe
centrifugal clutch. The clutch is throttle lever activated and drives an ‘A’ section main drive V
-belt transmitting power from the engine to the input shaft pulley located on the far side of
the tee gearbox (yellow) The V-belt is tensioned by an adjustable jockey pulley which rides
on the inside V section tensioning the belt outward in its natural curvature rather than riding
on the back of the belt thereby minimising belt failure from splitting. The belt is easily
accessible for adjustment or replacement by removing the cover.
Ground Drive Assembly
The V belt driven input shaft runs through the sealed oil filled tee gearbox across the width
of the chassis driving a 30mm (1 ¼”) wide flat toothed belt to transmit power to the blade-
drive crankshaft. The worm-gear shaft extends downwards from the tee gearbox through the
worm tube casing transmitting power to the front wheel axle (blue) by engaging on a heavy
duty 160mm (6”) diameter bronze worm wheel. The worm gear drive is engaged and
disengaged by a remote gear lever via a direct linkage rod and activating cam within the
axle casing.
Front Axle Assembly
The positioning of the wheel axle within the casing maximises traction, balance and blade
ground clearance. The worm gears are enclosed and submerged in the oil filled casing for
long life and is virtually maintenance free.
Crank Assembly
The flat toothed belt transmits power from the tee gearbox output shaft via the lever
activated plunger-pin blade drive clutch to the blade drive crankshaft. The flat belt is quiet
running, extremely long lasting and requires no lubrication. It provides a cushion drive to the
cutter-blade helping prevent damage from stones or intrusions. The blade drive flat belt is
easily accessible for adjustment or replacement by removing the belt cover. The blade drive
crankshaft is fitted with two flywheel counter-balance weights which counteract the
vibrations generated by the oscillating blade drive mechanism.
Blade Assembly
A single connecting rod is located on the blade drive crankshaft and attaches to a high
tensile steel drive leg centrally located in relation to the cutter blade; this allows the blade to
flex at either side on impact with obstacles giving additional protection to the blade. The
blade drive connecting-rod is attached to the drive leg at a midway point above the cutter
blade allowing the crank drive to have a shorter throw keeping the moving mass to a
minimum, this in conjunction with the crank-shaft flywheels keep the vibration levels
generated by the blade drive mechanism to a minimum.
Page 7
TMC26 Technical Information
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