Pressure control was loading about every second and the spray was pulsating. Checked the unloader/pressure control, it seemed to be OK.
Disassembled to see the pistons and check valves. The top two pistons were spalled on the sides and corroded on the tip.The seals had been worn and damaged by the roughness of the pistons.
Ha
... Read mored to file off the raised areas on the sides of the pistons so they would pass through the housing.
Used the long bolts and some spacers to gradually remove the piston guide housing.
The pistons and seals came out easily. The pistons installed easily. The seals were a little more difficult. You have to apply pressure with your thumb and work the lip in with a small screw driver.
Check the check valves by putting water above the valve and see if it leaks through. I blew through the check valves and they started seating good. Put it all back together, added oil, and it worked like new.
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Model Cross Reference
This part works with the following models:
ERP Number: ERP9949559
Manufacturer Part Number: 4.553-172.0
This part is in stock in our warehouse and will ship out within 1 business day of the order being placed.
New stock is on the way! On order parts usually ship within 7 business days.
Item is not in stock and usually ships 10-15 business days from the time you place your order.
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_WW_4.gif "Part Location Diagram of 4.553-172.0 Karcher Piston Complete")
_WW_4.gif "Part Location Diagram of 4.553-172.0 Karcher Piston Complete")
