Husqvarna 6521RS Loss of power, Poor cut, uneven, Excessive, vibration, Starter rope, not filling

TROUBLESHOOTING - See appropriate section in manual unless directed to a Husqvarna Parts & Repair Center.

PROBLEM		CAUSE	CORRECTION
Does not start	9.	Control bar defective.	9.	Replace control bar.
(continued)	10. Fuel valve lever (if so		10. Turn fuel valve lever
		equipped) in OFF position.		to the ON position.
	11. Weak battery (if equipped).		11. Charge battery.
	12. Disconnected battery		12. Connect battery to engine.
		connector (if equipped).
Loss of power	1.	Rear of mower housing or	1.	Raise cutting height.
		blade dragging in grass.
	2.	Cutting too much grass.	2.	Raise cutting height.
	3.	Dirty air filter.	3.	Clean/replace air filter.
	4.	Buildup of grass, leaves,	4.	Clean underside of mower
		and trash under mower.		housing.
	5.	Too much oil in engine.	5.	Check oil level.
	6.	Walking speed too fast.	6.	Cut at slower walking speed.
Poor cut –	1.	Worn, bent or loose blade.	1.	Replace blade. Tighten
uneven				blade bolt.
	2.	Wheel heights uneven.	2.	Set all wheels at same
				height.
	3.	Buildup of grass, leaves	3.	Clean underside of
		and trash under mower.		mower housing.
Excessive	1.	Worn, bent or loose blade.	1.	Replace blade. Tighten
vibration				blade bolt.
	2.	Bent engine crankshaft.	2.	Contact a Husqvarna or other
				qualified service center.
Starter rope	1.	Engine flywheel brake is on	1.	Depress control bar to
hard to pull		when control bar is released.		upper handle before
				pulling the starter rope.
	2.	Bent engine crankshaft.	2.	Contact a Husqvarna or other
				qualified service center.
	3.	Blade adapter broken.	3.	Replace blade adapter.
	4.	Blade dragging in grass.	4.	Move lawn mower to cut
				grass or to hard surface.
Grass catcher	1.	Cutting height too low.	1.	Raise cutting height.
not filling	2.	Lift on blade worn off.	2.	Replace blade.
(If so equipped)	3.	Catcher not venting air.	3.	Clean grass catcher.
Hard to push	1.	Grass is too high or wheel	1.	Raise cutting height.
		height is too low.
	2.	Rear of mower housing or	2.	Raise rear of mower housing
		blade dragging in grass.		one (1) setting higher.
	3.	Grass catcher too full.	3.	Empty grass catcher.
	4.	Handle height position not	4.	Adjust handle height to suit.
		right for you.
Loss of drive	1.	Belt wear.	1.	Check/replace drive belt.
or slowing of	2.	Belt off of pulley.	2.	Check/reinstall drive belt.
drive speed	3.	Drive cable worn or broken.	3.	Replace drive cable.
	4.	“Loose” drive control system.	4.	Adjust drive control.

18