Komatsu PC200-7 Hydraulic Problem

[Bosvark Kzn]

On my PC 200, the operator says at times the arm won’t lower unless he first lifts the arm a little first. Then today the engine switched off while working. When trying to start the engine it cranks very slowly (like when the batteries are low) and we noticed while cranking the engine, the arm is actually lifting. Batteries are good. Why would the arm lift when cranking to start? It also won’t start as it’s turn over to slow to start.
Any advise on where to start checking for the problem will be appreciated.

 

[John C.]

Sounds like the arm cylinder is damaged and broken metal is getting stuck in the valve spool. Pull the return filters first looking for metal and cylinder packing. If you find material in there, the cylinder would be next and after that the control spool for the arm would need to come out plus the compensator valve as well.

 

[Bls repair]

Sounds like it may be the main valve sticking ( the one the pilot controls control).

 

[Bosvark Kzn]

Thanks for the advise, I’ll have a look at the components mentioned.

 

[dozr]

how many hours sounds like the way ours started ,swing break fibre then pilot control vale then brase in hyd tank now clean out new hyd pump hoping it will be fixed only a little over 5000 hrs got dash 5 still going with 12000 hrs on it, knot on wood . mabe it will pay for dash 7 repairs. ha ha

 

[Bosvark Kzn]

how many hours sounds like the way ours started ,swing break fibre then pilot control vale then brase in hyd tank now clean out new hyd pump hoping it will be fixed only a little over 5000 hrs got dash 5 still going with 12000 hrs on it, knot on wood . mabe it will pay for dash 7 repairs. ha ha

It’s on 14000 hrs