Husqvarna 340, 345, 346XP,350, 351, 353 Troubleshooting carburettor heater 346XPG, 351G, 353G

Repair instructions

6

Unscrew the two bolts from the right side of the rear hand grip. Remove the throttle lock and throttle handle, see “Throttle trigger”. Pull out the heater element with the leads still connected.

Troubleshooting carburettor heater (346XPG, 351G, 353G)

Operation

The carburettor temperature is controlled by an electronic thermostat to eliminate the risk of ice formation in the carburettor. The thermostat switches on/off at 12°C/54F. This means that the saw operator does not need to remember to switch the carburettor heater on or off.

•Troubleshooting Front handle heater

Remove the side cover from the handle. Discon- nect the leads at F and G (see diagram).

Clean the connectors. Turn the switch ”on”. Measure the resistance between F and G.

The reading should be 4±1 ohms. If not, discon- nect the lead at O and remove the switch. Measure the resistance between O and F. The reading should be 4±1 ohms. If the resistance is incorrect, replace the front handle.

Disconnect the lead at N and G and measure the resistance between these points. The reading should be no higher than 0.1 ohm. If it is too high, replace the lead.

Switch

Measure the resistance between N and O with the switch turned off. The reading should be 1 000 ohms or higher.

Repeat the measurement with the switch turned on. The reading should be no higher than 0.1 ohm. If it is too high, replace the switch.

Rear handle heater

Measure the resistance between F and Z. It should be 1 ± 0.5 ohm.

If not, replace the rear handle heater.

Generator

Measure the resistance between G and H. It should be between 0.3–1.3 ohm.

If not, replace the generator.

Carburettor heater

Disconnect the lead at X and clean the connectors. Measure the resistance between X and G.

The reading should be between 3–10 ohms. If not, disconnect the lead at Y and clean the connectors. Measure the resistance between X and Y, if the reading is not between 3–7 ohms – replace the carburettor heater.

O

	Z
	5
N	5
G	F
	3
	KV X

4

Y 11

H

English – 19