It worked in October. In April it will not start — and the reason is almost always in the tank.
The most common garden machine, and the one with the most predictable failure: petrol left in the carburettor over winter turns to varnish and blocks the jet.
Replacement parts
These rows come from the manufacturer’s own parts pages, read on Husqvarna. The code is the one you order by. The price is the maker’s list price on the day we read it — shops sell for less, which is what the buttons are for.
| Part | Maker’s code | List price | |
|---|---|---|---|
| Wheel Adjusting Bracket Lh on XT722FE |
532410623 | $3.99 | 🛒 Find it |
| Wheel Adj Bracket Front on 5521P |
532410594 | $3.99 | 🛒 Find it |
| Wheel Adjusting Bracket on XT722FE |
532410624 | $3.99 | 🛒 Find it |
| Height Adjuster System on L321AH |
598453901 | $44.99 | 🛒 Find it |
| Handle Support Assy on 5521P |
588912406 | $6.99 | 🛒 Find it |
| Hexagon Locking Nut on W520 |
732251401 | $1.99 | 🛒 Find it |
The list price is the maker’s own, for orientation: shops sell for less, and that is what the buttons are for.
Repair it, or replace it
The whole machine
A carburettor kit costs less than a tank of fuel. A new deck does not — and rust under the deck is what usually ends these machines. Both new and used open in the shop for your country.
Walk-behind mowers: the failures that repeat
Stale fuel first, then the air filter, then the spark plug. After that: a blade bolt that was never torqued, a recoil spring that has lost its tension, a deck that has rusted where the grass packed against it.
Written by the TroubleAtlas technical team from the manuals listed at the foot of this page. Where a maker documents a fault, we quote the maker.
What the maker sells as a replacement
Not “the most common failures” — nobody publishes that honestly. This is what Husqvarna stocks as a spare for these machines, fasteners excluded.
- Spring
- Bracket
- Knob
- Baffle
- Handle
- Deflector
- Cable
- Door
- Height Adjuster
- Wheel
Tools you’ll need
Chosen for this family, not a generic list. Prices and availability come from the shop in your country, with our tracking.
The machines we hold in this family
- 5521P
- 6021P
- 7021P
- HD725E
- HD800BBC
- HU550F
- HU550FH
- HU625AWD
- HU675AWD
- HU675FE
- HU700AWD
- HU700F
- HU700H
- HU700L
- HU725AWD BBC
- HU725AWDE
- HU725AWDEX
- HU725AWDH
- HU725AWDHQ
- HU725BBC
- HU775L
- HU800AWD
- HU800AWDH
- HU800AWDX/BBC
- HU800H
- L121FH
- L221A
- L221FH
- L221FHE
- L321AH
- L321AHE
- LC 121P
- LC 221A
- LC 221AH
- LC 221R
- LC 221RH
- LE-322R Lawn Xpert (tool only)
- Lawn Xpert LE-322R (battery and charger included)
- L 221AHK
- L 221AK
A selection of the machines in this family.
Where this comes from
- Husqvarna Machine data, manuals and parts lists, read on the maker’s own pages.
The other families
Every machine in the section starts from one of these. Back to the garden hub.
Robot mowers
They run alone until they stop alone. Boundary wire, lifted-wheel errors, blade discs.
Open →
Riding mowers & tractors
Deck belts, PTO clutches, safety switches that cut the engine for no visible reason.
Open →
Chainsaws
Chain tension, bar wear, two-stroke mix gone stale, a clutch that drags at idle.
Open →
Trimmers & brushcutters
Line that will not feed, heads that unscrew themselves, shafts that stop turning.
Open →
Hedge trimmers
Blades that jam on green wood, gearboxes that run dry, triggers with two safeties.
Open →
Blowers & vacuums
Loss of air, impellers packed with leaves, batteries that fall off under load.
Open →
Generators
No output at the socket, AVR faults, low-oil cut-outs, dual-fuel changeover.
Open →
Pressure washers
Pressure that drops, pumps that pulse, unloader valves and blocked nozzles.
Open →
Multi-tools & pole saws
One powerhead, many attachments — and couplings that wear where they meet.
Open →
Chippers & shredders
Feed that stalls, knives that dull, chutes that block before the engine complains.
Open →TroubleAtlas Technical Team · Last checked 26 September 2026 · How we verify