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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Kobelco SK 220

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Dave James

09-18-2007 03:43:30




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Does anyone know anything about a final drive on the Kobelco SK 220? Or does anyone know where I can buy a manual for one?




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Rob in Indiana

09-18-2007 15:57:39




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 Re: Kobelco SK 220 in reply to Dave James, 09-18-2007 03:43:30  
what happened to your final? manuals are avilable from any Kobelco dealer.

been repairing Kobelcos for many years so I most likely can help you



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Dave James

09-18-2007 18:10:57




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 Re: Kobelco SK 220 in reply to Rob in Indiana, 09-18-2007 15:57:39  
Hi thanks for replying, had the drive motor supposedly reconditioned, but its pressurising the case drain excessively to the point that the case return cant take the amount of return flow therefore blowing the seal into the planetaries. Case return line is 100% clear and is also getting warm within a few minutes possibly due to the high flow returning. The reconditioners are saying its possibly elsewhere - a mechanic friend thinks it has to be in the motor due to the high flow of return oil. The supply lines are not getting warm.
So much pressure in the planetaries housing that it is bending the cover. We live out in the country and this is why we have access dilemmas.
really appreciate any help, thankyou
Dave

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Rob in Indiana

09-20-2007 04:39:39




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 Re: Kobelco SK 220 in reply to Dave James, 09-18-2007 18:10:57  
just posted a reply but my morning coffee is now kicking in and Im a bit more bright eyed.

is your case drain flow high when you run the motor both forword and reverse?



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Ron in Indiana

09-20-2007 04:30:56




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 Re: Kobelco SK 220 in reply to Dave James, 09-18-2007 18:10:57  
a good general rule for case drain is 1/2 GPM flow per 1000 PSI. anything less than that is great and anything more points to drive motor problem.

at most you should be seeing 4 GPM



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Rob in Indiana

09-20-2007 04:23:31




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 Re: Kobelco SK 220 in reply to Dave James, 09-18-2007 18:10:57  
sounds as if you reman drive motor is junk.



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NC Wayne

09-18-2007 20:24:04




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 Re: Kobelco SK 220 in reply to Dave James, 09-18-2007 18:10:57  
Like Rob said the manuals are available through the dealer. I just got one the other day for the same model machine. Don't know what the differences are in serial numbers but I do know there was a break, so have the serial number handy and expect to pay around $400 for it. Based on what your saying I think the guys that "remaned" the pump screwed up. The case drain returns nothing back to the tank except oil that bypasses internally in the motor and all motors or pumps are gonna have a spec as to how much is allowable. As always oil bypassing under pressure causes heat and an excessive amount causes alot of heat. You said your seeing the case drain line heating which tells me that it is in fact bypassing too much oil. Unfortunately I can't tell you right off what that spec would be but the line used by the OEM should handle the flow with no problems. Sounds to me like the reman guys are trying to tell you the pressure is coming from elsewhere. To shut them up disconnect the line from the rest of the system and cap the system side. Then take the line from the motor and stick it down in a suitable container and do a timed flow, say for a minute or 30 seconds depending on the amount of flow, and see how much you get. Based on what your saying I'd make sure the container was a 20 gallon drum or something equivilent and make sure the line is tied down tight so it can't get away when the oil starts flowing through it under pressure. You should be able to pick up that track with the boom so it's off the ground where the machine can stay stationary while doing it. If your getting a masive amount of flow with it in this condition then your most likely getting alot more when actually walking as the system pressure supplying the motor is gonna rise because of the load....and a higher pressure on the plungers is gonna cause more bypass therefore more case drain flow resulting in a higher pressure. Lastly, take the results and the motor back to the reman guys and make them fix it right this time. Good luck and let us know what you find.

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