Question about Karcher 2500 PSI Pressure Washer

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My karcher hds 745 has started blowing fuses. it switches on the power light comes on and it makes a buzzing noise for about five seconds and then blows the mains 13amp fuse. i have replaced it twice but the same happens every time. the power lead is fine

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  • 33 Answers

You have an electrical short in the motor windings. you'll have to either replace the motor or buy another washer. also check to see if the motor isn't locked up with a piece of trash. to do that you'll have to dissassemble housing until you get to the motor. it should turn easily by hand. if so you have a short.

Posted on Apr 21, 2009

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Posted on Jan 02, 2017

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My karcher hds 745 has started blowing fuses. it switches on the power light comes on and it makes a buzzing noise for about five seconds and then blows the mains 13amp fuse. i have replaced it twice but...


Dear dumbelldaveb,
Having a 13A fuse I am concluding that the machine is single phase. Most probably you have a faulty capacitor. Check the capacitor and if you find it expanded and leaking...then you must change it with a new one. If you see the capacitor is normal just the same it could be shorted. So change the capacitor with a new one and try to start the machine WITHOUT LOAD. Which means no water inlet and no gun attached. Doing this you can also remove temporarly the micro switches. If the motor still hums, then most probably there is a fault in the electric motor.
Now if you find out that the fault is the capacitor (which in my opinion it is the case)...you must see why the capacitor broke. If when using the machine and the gun is closed, the machine starts on and off on its own,...this will damage the capacitor. This on and off fault could come from a leaking gun. Or a leak from the seals. Whatever....the machine must not be left going ON and Off when the gun is closed. This ON and OFF could be due to faulty micro switches and control valves.
I am very sorry to mention a lot of things, but I hope as in many cases,..the changing of the capacitor will solve the problem. I wish to add that the electrical lead wire must be checked. On many occasions I found that the electrical lead wire from the plug to the machine was damaged and shorted, ..due to pulling, wear and tear.
Regards,
Fulltech.

Apr 19, 2009 | Karcher Garden

2 Answers

Karcher HDS 750 HOT HIGH PRESSURE WASHER


G-day Mate.

Did you check if the igniters? they may be cloged up with ****. Unscrew the Sight glass on top of the boiler and run the machine (in cold or hot mode, doesn't matter, as the igniters are running all the time) and see if there are working, you should take them out anyway and give them a wipe with a rag as general maintenance item, and when you put them back in there should be about 5mm gap between them.


Less common reasons for the boiler to not work
- Faulty fuel solenoid valve, (You should hear a click sound about 5 - 10 seconds after you pull the trigger)
- Dirty fuel filter,


Take a look at those simple things and let me know if its any of these.

I have a Karcher HDS 750 1989 Year model

This machine just keeps going, it's had a fairly tough life but it has stood up to it all,

i hadent spent anything on it until about 6 months ago when i purchased a new fuel pump for it as the old was wasn't pushing 170PSI to the Disiel injector it had slowly droped 70psi, and it doesn't create a hotter burn in the boiler, but still very good for a 19yr old pump,

other than that thats all it's needed, it's still going strong to date
Very robust machine.

my e-mail is cgodfx@internode.on.net

Cheers Matt.

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