Komatsu PC 290 - 8 HELP !!!

[Ivan Jurenka]

I have a problem with Komatsu PC - 290 - 8. While working engine keep stoping after load pressure. Just engine swith off !
engine power is all right. Hydraulic pump was repaired a few days ago, pressures are fine. The computer doesn´s show any error !!! Problem is not constant - power is maximum or minimum and movements of machine are slowly. Many engineeres from Komatsu have tried to solve this out but can´t find the main problem.
Any advice please ??? Thank you

 

[Bls repair]

Is engine stalling or is the engine rpm going down

 

[barnicleson]

check fuel injection wiring at injectors, Check continuity back to ecm from each injector.

 

[Hydraumind]

Any error code showing on the monitor

 

[Ivan Jurenka]

Thank you. No error showing on the monitor ! Engine power is 100 % all right. The error is inside of hydraulic system. The engine starting going down when the pressure is 300 bar or when joistick is in the maximal positions. Main pump was reapired completely and it´s still the same. During working mode L Merge - divider valve doesn´t separate pumps. Front pump and right pump work together. Problem started by high PPC pressure . Pressure reducitng valve was repaired, pressure circuit is 33 bar.

 

[Bls repair]

Is pressure relief valve working ?

 

[Ivan Jurenka]

Is pressure relief valve working ?

Pressure reducitng valve was repaired ( new one ) pressure circuit is 33 bar. Sometimes was 60 bar but it has been set up on 33 bar. While opening empty bucket, engine turn off when the pressure is 170 bar and rate power engine is 105 %. It´s similar while it´s swinging.

 

[Ivan Jurenka]

Pressure reducitng valve was repaired ( new one ) pressure circuit is 33 bar. Sometimes was 60 bar but it has been set up on 33 bar. While opening empty bucket, engine turn off when the pressure is 170 bar and rate power engine is 105 %. It´s similar while it´s swinging.

Is pressure relief valve working ?

Do you mean this pressure valve ?

 

[Bls repair]

Pressure relief valve is suppose to open to keep from over pressuring the the hyd system

 

[Hydraumind]

Why you repaired main pump?

 

[Ivan Jurenka]

Why you repaired main pump?

I thougt main pump was the reason, and some parts of pump were worn out.

 

[Ivan Jurenka]

Pressure relief valve is suppose to open to keep from over pressuring the the hyd system

Even thought I set it up on 33 bar it´s still the same !

 

[Hydraumind]

You still have overload on the engine it comes from the pump. The reducing does not affect the engine

 

[Ivan Jurenka]

You still have overload on the engine it comes from the pump. The reducing does not affect the engine

I know it does not affect the engine. Sometimes pressuer is to high and then doesn´t work at all