///The pump does not shift or stops at the end of a stroke
Intensifier: hydraulics & oil
The pump does not shift or stops at the end of a stroke
The intensifier changes direction when a sensor sees the piston at the end and the directional valve switches the oil.
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.
What do the proximity switch lights do?
2Check the causes, most likely first
0 of 4 checked
01Faulty proximity switch
Most likely
No end-of-stroke signal, so no shift.
How to check: The switch LED should light at the stroke end. Both lights on at once also means a fault.
| Photo | Art. no. | Description | Excl. VAT | |
|---|---|---|---|---|
 | 10095 | Proximity Switch, 05127584
Gauge & sensorKMT |
€ 379.00 | |
 | 10154 | O-ring Spacer proximity switch, 05144191
O-ringKMT |
€ 1.32 | |
 | 10169 | Spacer proximity switch, 05144183
Bushing & ringKMT |
€ 25.92 | |
 | 10225 | Screw, Proximity Switch M6x25MM, 10064707
Screw & boltKMT |
€ 1.08 | |
 | 10585 | Proximity Switch 75/100s, 20453925
Gauge & sensorKMT |
€ 538.80 |
02Directional valve or coil
Possible
A burned coil or sticking spool does not switch the oil.
How to check: Measure coil voltage; some valves can be shifted by hand.
03Stuck indicator pin
Possible
The pin that triggers the switch must move freely.
How to check: Remove and check that the pin moves to the bottom of its bore.
04Cutting head off / intensifier disabled
Less likely
With no flow the intensifier simply holds.
How to check: Check the on/off valve and the enable setting.
Related problems
General advice based on manufacturer manuals and service practice. Always follow the manual of your machine. Not sure? .