One track wont move or very very slow

[AmoyPutok]

What is the cause of the slow moving track (left) on my sk200-8 kobelco excavator. we already checked the drive motor but still very slow when we turn using the left track.

 

[simonsrplant]

Are any other functions slow? Boom, stick, bucket?

 

[AmoyPutok]

Are any other functions slow? Boom, stick, bucket?

Other functions are just fine and working normally..

 

[windra sampurna]

how with pressure output hydraulic pump ?

 

[Cotterpin]

Check P-port fitting on the Left travel control valve . oil supply port fitting . Some machines have screened port fittings to keep debris out of pilot oil system . When they get clogged , travel function is limited or non existent.

 

[AmoyPutok]

We check with hydraulic pressure gauge but there is no pressure on forward & reverse port line.

 

[finaldrive]

Check pressure at main hydraulic pump. Not at travel motor.

 

[simonsrplant]

Check pressure at main hydraulic pump. Not at travel motor.

Both sides and under load.

 

[AmoyPutok]

We check already the main pump and main relief, but still very low pressure. Only left track is is having problem, right side is okey.

 

[AmoyPutok]

After a series of troubleshooting we found out that the control valve is defective, and when we've changed it, the machine works fine.