Karcher Pressure Washers

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Hi,
I have a cleaning services business i will start also window cleaning and power wash cleaning, so a i need a power wash and my cosin has one Karcher 4000 PSI Gas Pressure Washer #G4000SH with is grate and runs and looks nice he is not using it any more and he ask me $600$ it need only a gun extension.
i look at ebay and amazon and the same machine is around $850 to $899(on sale).
i realy apreciate all help especialy from experts.

thank you!

Technical Details:Karcher 4000 PSI Gas Pressure Washer #G4000SH
4,000 psi gas-powered pressure washer with 13 hp Honda GX series engine
For heavy-duty cleaning jobs
Features high-performance commercial-grade pump with brass pump head
Includes stainless-steel wand, 50-foot hose, and full set of Quick Connect nozzles
75 pounds

thank you all

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karcher 2400 psi power washer sat in storsge for 2 years runs fine but i had to put a new wand on first start i had pressure let go then no pressure now look at owners manual said to purge for air so i did and nothing i have no leaks or blockages pump seems alright any help would be great thanks

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I have a Karcher K2400 HH gas power washer that won’t hold pressure. It will pressurize for a few seconds, then cut off. Any ideas on how to trouble shoot this? Any ideas on what may be the problem, and how difficult would it be to repair? Thanks