///Water leaks from the sealing head weep hole
Intensifier: high-pressure side

Water leaks from the sealing head weep hole

A leak at the sealing head weep hole points to the discharge check valve seat or the gland nut area.

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.
1Quick questionsYour answers put the most likely cause on top.
Is the sealing head much hotter than the other side?
2Check the causes, most likely first 0 of 3 checked
01Discharge check valve seat not sealing Most likely

Erosion or debris on the seat lets high-pressure water pass.

How to check: Inspect seat and poppet for erosion rings after releasing pressure.

PhotoArt. no.DescriptionReplaces OEMExcl. VAT
10085 Spring Check valve, 05147863
SpringKMT, H2O
 KMT 05147863 · KMT 49894116 € 1.90
10088 Flat Outlet Poppet, 05116561
PoppetKMT, H2O
 KMT 05116561 · KMT 05112776 € 31.80
10089 Retainer, Poppet, LP-IN SLIV, 10118552
PoppetKMT
 KMT 10118552 · KMT 05144670 € 42.29
10090 Spring Guide, Poppet, 05116751
PoppetKMT, H2O
 KMT 05116751 · H2O 102008-1 € 37.80
10091 Valve, Poppet, LP Inlet SLIV 10107894
PoppetKMT
 KMT 10107894 € 19.90

02Gland nut not at torque Possible

The sealing head only seals at the specified gland nut torque.

How to check: Torque the gland nut to the manual value.

03Cracked sealing head Less likely

A cracked sealing head body gets very hot and leaks.

How to check: A sealing head that is much hotter than normal and leaks again after a seat change.

Related problems

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