Karcher Power Washer Parts

The following are some of the most common problems suffered by all pressure cleaners. If you need the replacement Karcher power washer parts select the category on the left side of the screen and locate the part by matching the part numbers. Original Karcher part numbers are located on parts themselves.

If your particular problem is not covered here - hop on over to the Contact Us page and fill out the questions form with your problem. We will try to reply as soon as we determine the part that you need.

HANDY HINTS For Common Karcher Power Washer Pump Problems

My pump is pulsating.

1. Check RPM. It should be 3200-3300.
2. Check accessories: Clogged or too small of nozzles, dent in lance or gun, kink in hose.
3. Check nozzle insert for obstruction/build-up.
4. Check the check valves for proper seal.
5. Worn pump valves or broken valve spring.

My pump has low or no pressure.

1. Check for water Leaks (hose or plumbing).
2. Check water supply: adequate and constant, also clean the inlet filter.
3. A worn or incorrect spray nozzle would cause loss in pressure (or spray nozzles not completely turned to high pressure).
4. Unloader valve improperly set.
5. Check for signs of worn pump valves or broken valve spring, dirt in pump valves
6. Safety relief valve (if applicable).
7. Air in water supply (air leak).
8. Engine RPM is too low.
9. Insufficient water supply (could cause pump cavitations).
10. Insufficient engine power .

My pump won't draw soap.

1. Verify using a detergent nozzle (black tip).
2. Verify filter is "on".
3. Check hose and filter for clogs or cuts.
4. Check the valve to make sure it isn't stuck to o-ring.
5. Check the nozzle insert for a clog.
6. Do not use dense chemical or cleaning solution.
7. Distance between the chemical injector and nozzle is too great (100FT or more).

My Engine Won’t Start.

1. Engine low on fuel.
2. Engine low on oil.
3. Switch in “off” position.
4. Worn or dirty spark plug.
5. Not properly choked for cold starting.
6. Over choked and flooded.
7. Fuel supply valve turned off.

My Recoil Starter Hard to Pull

1. Pressure built up in system, relieve by squeezing trigger gun.
2. Low oil crankcase / pump assembly.
3. Hydro Locked – oil or fuel in cylinders.

Excessive Vibration or Pulsations

1. Insufficient water supply.
2. Dirt in pump valves.
3. Air in water supply (air leak).
4. Clogged inlet water filter.
5. Clogged or damaged spray nozzle causing relief valve.

Fluctuating Pulsation

1. Incorrect fuel, dirty or worn spark plug.
2. Choke on after engine warmed up.
3. Air in water supply (air leak).
4. Dirt in pump valves.
5. Excessive pump pressure causing engine overload.
6. Worn or burned engine valves.