If your Karcher isn't reaching high pressure, and you've noticed the trigger is "pulsing" this could mean you need to replace the cylinder head. The valves in the cylinder head can become blocked and clogged, reducing the tension needed to be able to use the washer to its full potential.
Comes complete with piston seals
This is a genuine Karcher spare, suitable for select appliances in the model fit list.
Please note: For certain models the spare is serial and chassis number dependent. Please contact our call centre with this information so we can advise if the part will fit. Your chassis number will look like: 1.504-604.0, and the serial number will be 6 digits long.
QIve lost oil changing a pressure washer cylinder head, how and what do I repace it with!i5 Answers
By Softy- Kent
- 02 June 2011
Can we just clarify Rory's previous answer.
Electric pressure washers do not generally require the gearbox oil to be topped up or replaced during there normal working life.
However if during disassembling the machine oil is allowed to spill from the gearbox it is important for this to be replaced or the gear box will quickly wear and fail.
Sorry for any confusion our previous answer may have caused.
- 15 July 2015
You can buy Karcher oil at, I believe, £34 pounds odd a litre, or use a good quality multigrade engine oil, which is just the same. Look on Youtube under Karcher repairs.
By D.R.- Sheffield
- 14 July 2015
Ref Colbee comment. We mistakenly stated that electric pressure washers do not contain oil. The link given to Stock Number: ES538165 is an oils approved for pressure washer pumps and is suitable.
- 20 June 2014
Sorry, I'm a latecomer to this post, but I beg to differ with the response by staff-member Rory on 3/6/2011 who stated that an electric washer does not need oil; surely, in an electric washer, the swash plate chamber contains oil which is easily lost if the retaining bolts are loosened/removed and the motor is not kept upright.
Qsymptoms are motor pulsing, low pressure, sounds like i need a cylinder head, but what else might cause same symptoms?2 Answers
K 3.575, not very old but ran briefly without water supply when hose fitting blew
By richard- pl124er
- 11 November 2014
If the seals look okay you may have a tiny crack in the cylider head or the control head, especially if you have ever let it freeze. Basically if there is no external water leak you have an internal pressure leak - a valve or crack is most likely. Cylinder head eliminates most things as it is a complete assembly and very inexpensive. Control head is next most likely for an invisible leak, but is not so inexpensive, and more individual to the models. You can run these for several seconds without water supply without damage, and as the topseals are in the cylinder head assembly this is well worth a try.
By D.R.- Sheffield
- 14 July 2015
It is likely if the problem occurred immediately after running with no water that the seals of the pump have been damaged and this part should resolve your problem.
QMy pressure washer runs ok for about an hour then cuts out, (help please)1 Answer
By Mr Gerald Bumphrey- Norfolk
- 10 February 2016
We have no information on this but if the machine totally stops for a period of time then restarts it is likely the motor has overheated and has a thermal cut out. Most domestic machines would not be used for over an hour so it may not be faulty only replacing the motor and capacitor would prove if faulty or not.
K5 unit only couple of years old if that seems fine using dirt blaster but today using the vario gun the spray is really poor and uneven and the pump pressure seems low and its pulsing . Never done this before checks filter , fgun is clear , any ideas where to start , gun or pump
By Dave- Shropshire
- 20 July 2015
Check the filter on the inlet is clean and the water supply is sufficient and no air leaks. If the problem continues try another spray head as this may be due to dirt restricting the spray nozzle. If still unresolved and no leaks suspect cylinder head seals.