Help Please: One side track will not move on my Kobelco?

[redline808]

I have a Kobelco excavator grey market SK03. Right now it is stuck in one place. The problem is, my right side track will not move? I used the arm to lift up the left side track off the ground this tilts the machine so the track in free in the air, I use the left track control, I push forward and back, the track works just fine, I do the same thing for the right side lifting the right track so it is free in the air and using the right track control, what happens is the track will move, barely in reverse a few feet then gets stuck, if I try to move it forward, it gets suck after only a few inches. Hydraulic fluid level is fine. All other machine hydraulic functions work fine. Any ideas on what my problem might be?

Thank you.

 

[mike69440]

Glad I am Not alone

Change your post to Komatsu PC75UU-2E and we seem to have same problem, you hope. My problem was in the valving , not the drive, and it cost $3000 to fix. If your problem is the drive itself, just shoot the machine and sell for scrap. Hope the problem is a simple one.

 

[Countryboy]

Welcome to HEF redline808! :drinkup

 

[DirtySouthTruck]

Buy a Volvo!

 

[Wulf]

Buy a Volvo!

:beatsme

Not yet DirtySouthTruck... sounds most likely to be a travel motor failure, but it could be the final drive planetary, a travel spool not shifting or even the rotary swivel but this would really have to be hooped to give the symptoms described.

I'm not sure of the construction of the SK03 and whether the motor is separate from the final drive or whether they are unit construction like most modern excavators. Hopefully you already checked the final drive oil for signs of gear failure. Some other things you could do would be to check travel pressure, if its low then blank off the travel lines to the motor and check it again. Check motor case drain pressure and if you don't know the spec, compare with the good side. If oil is being supplied to the motor and its not rotating then it must be leaking somewhere which will probably generate noise and heat so check the lines for abnormal noise, pulsation and high temperature.

One good thing is that as you have one good motor you can swap the lines on the swivel to change oils supply left to right etc to eliminate the pump, control valve and swivel from the equation.

 

[redline808]

I took 2 videos of what is happening. Please check it out and tell me your thought.

I think something is broken in the travel motor?

http://www.youtube.com/watch?v=RE7a2O2xObc

http://www.youtube.com/watch?v=YvgITbjwLM4

Thanks.

 

[minimax]

That final drive is no good. A final drive on the minis that size are about 6-7K from the OEM .

minimax

 

[stumper120]

drive

how much does the sko3 weigh? what class? it looks like a hydash motor on it now

 

[stumpjumper83]

keep disassembeling, and see how the problem changes. If in fact your planetary is the problem there is a possibility that a good machinist might be able to save the day. Also depending on what you need I know a guy that restores heavy equipment like clark airborne crawlers and stuff. That man is the smartest parts man that I have ever known, he might be able to locate you either parts for, or maybe a used planetary or something.

 

[Countryboy]

Welcome to HEF stumper120! :drinkup

 

[John C.]

That is a Hi Dash final with the three fingers and lots of needle bearings. By the way you were jambing it both ways there isn't much more than scrap metal inside there now.

You might try to find a used one. Search excavator parts in Google and go from there. Some names of used parts companys are H&R, Langley Excavator Parts, DomEx and FP Smith.

Most Japanese excavators use that final but there might be differences in gear ratios between them so be careful and get a warranty before you send any money for a used one.

 

[Wulf]

That was a great idea to post a video... it does look fatal but did you check the final drive oil for debris? Those final drives often show signs of particle contamination but in this case you may see fragments or major contamination especially when compared with the other side.

My bet would be that the final drive is toast and is not economical to repair.

Here is a link to one of Johns suggestions for a replacement hy-dash final drive assembly:

http://www.hrparts.com/hrwest.html

 

[Woodstock]

It looks like your front idler berings are out too.

 

[DigDug]

Good idea on the video ! I would start by pulling the final drive apart and i am quite sure you will find the problem. Show us the insides. doug

 

[xcvator]

i,d be checkin that front idler. with a tight track it could be enough to stall your final.

 

[Countryboy]

Welcome to HEF xcvator! :drinkup

 

[nedly05]

We have a 70SR kobelco, the thing has never had an abundance of power in hills, it always goes just very slowly. The right side drive seems to make a small noise now.

 

[redline808]

how much does the sko3 weigh? what class? it looks like a hydash motor on it now

I don't know exactly how much it weights. I assume around 10 tons, it smashes my 11 ton trailer pretty good. it is a HI-Dash.

 

[redline808]

That is a Hi Dash final with the three fingers and lots of needle bearings. By the way you were jambing it both ways there isn't much more than scrap metal inside there now.

You might try to find a used one. Search excavator parts in Google and go from there. Some names of used parts companys are H&R, Langley Excavator Parts, DomEx and FP Smith.

Most Japanese excavators use that final but there might be differences in gear ratios between them so be careful and get a warranty before you send any money for a used one.

What, jambing it both ways is not good? Ummm, Yea. My fault. It wouldn't go, so force it mentality set in. at first I thought there was a rock stuck in the track. Volcanic rock here in Hawaii is brutal. Now I know something is broken inside.

 

[redline808]

That was a great idea to post a video... it does look fatal but did you check the final drive oil for debris? Those final drives often show signs of particle contamination but in this case you may see fragments or major contamination especially when compared with the other side.

My bet would be that the final drive is toast and is not economical to repair.

Here is a link to one of Johns suggestions for a replacement hy-dash final drive assembly:

http://www.hrparts.com/hrwest.html

Something is toast. In fact, after pain getting it off the machine, the oil that came out was metallic looking with small bits of metal and smelled so bad, I mean really really bad like you cannot believe.