Husqvarna YTH180 owner manual To Replace Fuse, To Replace Headlight Bulb, Interlocks and Relays

SERVICE AND ADJUSTMENTS

TO REPLACE FUSE

Replace with 30 amp automotive-type plug-in fuse. The fuse holder is located in the engine compartment, directly in front of the dash.

TO REPLACE HEADLIGHT BULB

•Raise hood.

•Pull bulb holder out of the hole in the backside of the grill.

•Replace bulb in holder and push bulb holder securely back into the hole in the backside of the grill.

•Close hood.

INTERLOCKS AND RELAYS

Loose or damaged wiring may cause your tractor to run poorly, stop running or prevent it from starting.

•Check wiring. See the electrical wiring diagram in the Repair Parts section of this manual.

TO REMOVE HOOD AND GRILL ASSEMBLY (See Fig. 35)

•Lift hood. Disconnect headlight wiring connection.

•Remove wingnut at rear of each side panel.

•Remove retainer springs from hood pivot brackets.

•Pivot hood and side panel forward and lift off tractor.

•To replace, reverse above procedure.

ENGINE

TO ADJUST THROTTLE CONTROL CABLE (See Figs. 36 & 37)

The throttle control has been preset at the factory and adjustment should not be necessary. Check adjustment as described below before loosening cable. If adjustment is necessary, proceed as follows:

•With engine not running, move throttle control lever to fast () position.

•Check that speed control lever is against stop screw. If it is not, loosen casing clamp screw and pull throttle cable until lever is against screw. Tighten clamp screw securely.

TO ADJUST CARBURETOR (See Fig. 38)

The carburetor has been present at the factory and adjust- ment should not be necessary. However, minor adjustment may be required to compensate for differences in fuel, temperature, altitude or load. If the carburetor does need adjustment, proceed as follows:

In general, turning the adjusting needles in (clockwise) decreases the supply of fuel to the engine giving a leaner fuel/air mixture. Turning the adjusting needles out (coun- terclockwise) increases the supply of fuel to the engine giving a richer fuel/air mixture.

IMPORTANT: DAMAGE TO THE NEEDLES AND THE SEATS IN CARBURETOR MAY RESULT IF SCREW IS TURNED IN TOO TIGHT.

	PRELIMINARY SETTING -
	• Be sure you have a clean air filter, and the throttle
		control cable is adjusted properly (see above).
	• With engine off turn idle fuel adjusting needle in (clock-
		wise) closing it finger tight and then turn out (counter-
WINGNUT		clockwise) 1-1/4 turns.
	• Turn main fuel adjusting needle in (clockwise) closing
		finger tight and then turn out (counterclockwise) 1 turn.
	FINAL SETTING -
	• Start engine and allow to warm for five minutes. Make
		final adjustments with engine running and shift/motion
		control lever in neutral (N) position.
	•	With throttle control lever in fast (			) position, turn main
		fuel adjusting needle in (clockwise) until engine begins
		to die then turn out (counterclockwise) until engine
		runs rough. Turn needle to a point midway between
		those two positions.
	• Idle speed setting - With throttle control lever in slow
		(	)	position, engine should idle at 1400 RPM. If
		engine idles too slow or fast, turn idle speed adjusting
		screw in or out until correct idle is attained.
	• Idle fuel needle setting - With throttle control lever in
		slow (		) position, turn idle fuel adjusting needle in
HEADLIGHT WIRING CONNECTION		(clockwise) until engine begins to die and then turn out
		(counterclockwise) until engine runs rough. Turn needle
		to a point midway between those two positions.
FIG. 35	•	Recheck idle speed. Readjust if necessary.
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