Drive Belt; Engine Speed - GEISMAR STUMEC MC3 Manual

5.1.6 Drive belt (this operation MUST be carried out with the engine stopped)
Drive belt tension:
Every 50 hours' operation, adjust the drive belt tension as follows:
➊ Unscrew the 2 screws Ref. ① with a flat screwdriver.
➋ Remove the front housing cover Ref. ⑦.
➌ Loosen nut Ref. ③ holding the tensioning roller in place (18 mm flat spanner).
Apply tension to the drive belt by moving the tensioning roller until the required
tension is obtained, then retighten nut Ref. ③.
➍ Put the front housing cover Ref. ⑦ in position and retighten the 2 screws Ref. ①.
Changing the drive belt:
➊ Remove the grinding wheel cover Ref. ⑤ by unscrewing the 4 nuts Ref. ⑥ and then
remove the grinding wheel.
➋ Unscrew the 9 screws Ref. ② holding the front housing Ref. ④ (13 mm flat spanner and 6 mm
Allen key). Remove the front cover.
➌ Loosen nut Ref. ③ holding the tensioning roller in place (18 mm flat spanner).
➍ Replace the belt and adjust its tension.
➎ Refit the front housing proceeding as for dismantling but in reverse order.
NB: Whenever a drive belt is exchanged or refitted, check that the pulley grooves are in good condition and clean them carefully together with the belt
grooves.

5.1.7 Engine speed

On leaving our works, the carburettor is delivered with the best-possible setting corresponding to barometric and climatic conditions at our works at the time.
For optimal use of the machine, it is important that the engine speed corresponds to the speed indicated in §2.3 "Technical Characteristics".
Besides normal servicing during use, it is recommended that any possible repairs or adjustments to the carburetor are carried out by members of the
GEISMAR sales or repair network. All carburetor adjustments must be made when the engine is hot. Refer strictly to the manufacturer's instructions when
making these adjustments.
Regularly check the maximum rotation speed of the engine running unloaded, using an electronic tachometer (Ref. HLN). A check must be made before the
machine is used for the first time, weather conditions and altitude may considerably modify settings.
To check the setting and measure engine speed, the machine must be placed in a work position.
Too low or too high speeds may cause premature wear on certain parts, even serious operating incidents.
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