How to fix low operating pressure on my Kärcher 1.575-553.0?
- Mmegan47Aug 20, 2025
If you're experiencing low operating pressure with your Kärcher Pressure Washer, several factors could be the cause. First, ensure that the water supply is sufficient by using a larger supply hose and cleaning the filter at the water inlet. Also, a worn or incorrect spray nozzle can cause this issue; match the nozzle number to the machine or replace it with a new one. Other potential causes include a slipping belt (tighten or replace it), leaks in the plumbing or hose (check for leaks and retape with Teflon tape), a faulty or misadjusted unloader (adjust or replace it), worn pump packing (install a new kit), obstructions in the spray nozzle (remove the obstruction), a leaking steam pressure control valve (rebuild or replace), or a slow engine RPM (set to proper specifications).