///Direct-drive pump does not come up to pressure
Direct-drive plunger pumps

Direct-drive pump does not come up to pressure

With the nozzle open the pump does not reach its normal pressure.

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
01Orifice too large or damaged Most likely

Too much flow for the pump.

How to check: Check orifice size against the chart.

PhotoArt. no.DescriptionReplaces OEMExcl. VAT
10226 Orifice 0,10 mm, 1010
OrificeKMT
KMT A2260004 € 11.26
10227 Orifice 0,12 mm, 1012
OrificeKMT
1012 € 11.26
10228 Orifice 0,15 mm, 1015
OrificeKMT
KMT A2260006 € 11.26
10229 Orifice 0,17 mm, 1017
OrificeKMT
KMT 49863590 · KMT A2260006 € 11.26
10230 Orifice 0,20 mm, 1020
OrificeKMT
KMT 49865850 € 11.26

02Leaking static or end cap seal Possible

Internal leakage.

How to check: Check end caps for heat.

03PCV leaking Possible

The control valve passes water to drain.

How to check: Check PCV outlet for flow.

Related problems

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