///Pump motor runs but the hydraulic pump does not turn
Intensifier: hydraulics & oil

Pump motor runs but the hydraulic pump does not turn

The motor drives the hydraulic pump through a coupling.

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 2 checked
01Broken flexible coupling Most likely

The motor turns but the pump does not.

How to check: Inspect the coupling.

PhotoArt. no.DescriptionReplaces OEMExcl. VAT
10521 Hydraulic pump AV10, 05045505
PumpKMT
KMT 05045505 € 5,278.80
11039 Low pressure Accumulator 2L
KMT, Projet
PROJET 105584 € 333.60
11041 Accumulator Assy 0,96L 05040696
AssemblyKMT
KMT 05040738 · KMT 05040696 € 5,988.00
11071 Sealing ring, Accumulator, 0,96L, 05040738
SealKMT
KMT 05040738A € 57.48
11072 Nut, Accumulator, 0,96L, 05801292
NutKMT
KMT 05801292 € 138.00

02Seized hydraulic pump Less likely

The pump blocks the motor.

How to check: The motor trips immediately on start.

Related problems

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