Makita EM4251 Service Manual download pdf (Page 48)

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11 - 3 Exhaust gas discharge

Exhaust gas is noxious. When operating the engine indoors, be sure to discharge the exhaust gage outdoor.

If a long exhaust pipe is used in such case, the internal resistance causes causing loss of engine power.

Thus, pipe inside diameter must be increased in proportion to exhaust pipe length.

Exhaust pipe : Less than 3m long, pipe inside diameter 30mm,

Less than 5m long, pipe inside diameter 33mm.

11 - 4 Power transmission to driven machines

11 - 4 - 1 Belt drive

Take the following notes into consideration.

* V- belts are preferable to flat belts.

* The driving shaft of the engine must be parallel to the driven shaft of the machine.

* The driving pulley of the engine must be in line with the driven pulley of the machine.

* Install the engine pulley as close to the engine as possible.

* If possible, span the belt horizontally.

* Disengage the load when starting the engine.

if no clutch is used, use a belt tension pulley or the like.

11 - 4 - 2 Flexible coupling

When using a flexible coupling, run out and misalignment between the drive shaft and engine shaft

must be minimized. run out and misalignment tolerance are specified by the coupling manufacturer.

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Makita EM4251 Service Manual Page 48