///Water drips from a weep hole on the HP cylinder or end cap
Intensifier: high-pressure side

Water drips from a weep hole on the HP cylinder or end cap

Weep holes show internal leaks early. Water from a weep hole on the intensifier means a high-pressure seal or sealing face has started to fail.

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 dripping water warm or cold?
Did the leak come back soon after a seal change?
2Check the causes, most likely first 0 of 4 checked
01Worn HP seal Most likely

The HP seal around the plunger wears every stroke and then leaks to the end cap weep hole.

How to check: One drop every few strokes: plan the change. A drop every stroke: change now.

PhotoArt. no.DescriptionReplaces OEMExcl. VAT
10040 Hp Seal kit SLIV+ SLV, 20422243
Seal kitKMT, WJS
 KMT 20422243 · KMT 05149703 € 49.20
10042 HP Seal kit SLIV, 05112487,05123385
Seal kitKMT
 KMT 05112487 · KMT 05123385 € 42.00
10100 HP Seal kit SLIV, 10110393
Seal kitKMT
 KMT 10110393 € 24.24
10101 HP Sealing head Assembly, SLIV, 05116769
AssemblyKMT
 KMT 05116769 · KMT 10110021 € 920.40
10102 HP Sealing head Assembly, SLIV+, 05144688
AssemblyKMT
 KMT 05144688 € 1,006.80

02Damaged sealing head seat or face Possible

Scratches or erosion on the static sealing faces let water pass.

How to check: Inspect the sealing head face and seat for scratches when the cylinder is open.

03Cracked HP cylinder end Less likely

A fatigue crack at the cylinder end leaks hot water and destroys seals.

How to check: Hot dripping cylinder end that returns soon after a seal change.

04Scratched plunger Less likely

A damaged plunger surface cuts new seals quickly.

How to check: Inspect the plunger against the light for lengthwise scratches.

Related problems

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