
Pressure that pulses is a starved pump, and the cause is upstream of it.
A pressure washer fails at the pump, but the reason is usually before the pump: the water it is being given.
Replacement parts
The search opens in the shop that delivers to your country, in that shop’s own language. New parts and used or refurbished ones are two different buttons, because they are two different markets.
Repair it, or replace it

The whole machine
Nozzles, hoses and seals are inexpensive. A pump that has frozen with water inside it is a new machine, not a repair. Both new and used open in the shop for your country.
Pressure washers: the failures that repeat
Blocked nozzles raise the pressure until the unloader valve cycles — that is the pulsing. A kinked inlet hose or a clogged filter starves the pump and does the same. Seals go last, not first.
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.
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
- Accessori, manuali e supporto per il modello PW 125
- Accessori, manuali e supporto per il modello PW 130
- Accessori, manuali e supporto per il modello PW 235
- Accessori, manuali e supporto per il modello PW 235R
- Accessori, manuali e supporto per il modello PW 240
- Accessori, manuali e supporto per il modello PW 345C
- Accessori, manuali e supporto per il modello PW 350
- Accessori, manuali e supporto per il modello PW 360
- Accessori, manuali e supporto per il modello PW 370
- Accessori, manuali e supporto per il modello PW 450
- Accessori, manuali e supporto per il modello PW 460
- Accessori, manuali e supporto per il modello PW 480
- Accessori, manuali e supporto per il modello PW 490
- HB32 - 3200 PSI Pressure Washer
- HB34 - 3400 PSI Pressure Washer
- HH36 - 3600 PSI Pressure Washer
- HH42 - 4200 PSI Pressure Washer
- Husqvarna 3200 PSI Horizontal Shaft Gas Pressure Washer
- PW3100
- PW3300
- Teile, Handbücher und Support für PW 130
- Teile, Handbücher und Support für PW 235
- Teile, Handbücher und Support für PW 235R
- Teile, Handbücher und Support für PW 240
- Teile, Handbücher und Support für PW 345C
- Teile, Handbücher und Support für PW 350
- Teile, Handbücher und Support für PW 360
- Teile, Handbücher und Support für PW 370
- Teile, Handbücher und Support für PW 450
- Teile, Handbücher und Support für PW 460
- Teile, Handbücher und Support für PW 480
- Teile, Handbücher und Support für PW 490
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 →
Walk-behind mowers
The machine that sat all winter and will not start in April. Carburettor, fuel, blade.
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 →
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

