///Booster pressure drops a lot during each stroke
Inlet water, booster & filters

Booster pressure drops a lot during each stroke

A large drop during the stroke shows the supply cannot keep up.

Safety first: Switch off the pump, release all pressure (open the on/off valve or bleed-down valve) and lock out before you open any high-pressure part. Never put a hand or tool near a running jet.
1Check the causes, most likely first 0 of 3 checked
01Supply flow too low Most likely

Pipe or supply too small.

How to check: Check supply flow and pipe size.

PhotoArt. no.DescriptionReplaces OEMExcl. VAT
10514 Booster pump, LP water, 49887094
PumpKMT
KMT 49887094 € 210.00
10539 Booster pump, LP water, 05071659
PumpKMT
KMT 05071659 € 432.00
10683 Booster Pump, LP Water 75-100 HP Booster pump, LP water,, 49836778
PumpKMT
KMT 49836778 € 418.80
10902 Booster pump, LP water, 20481206
PumpKMT, WSI
KMT 49890429 · KMT 20481206 € 274.80
02Dirty filter Possible

Filter restricts flow.

How to check: Replace the element.

03Booster temperature switch fault Less likely

A faulty switch interrupts the booster.

How to check: Test and replace the switch.

Related problems

General advice based on manufacturer manuals and service practice. Always follow the manual of your machine. Not sure? .