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Allis Chalmers

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Felix

11-08-2001 19:30:13

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hi, a friend of mine owna a 1970 Allis 610 backhoe/loader construction tractor. on the hydraulic pump which is in front of the engine there is a part which looks like a pto shaft that slides through a metal plate held on by 4 bolts and then goes to the pump the part the pto shaft type piece hooks to is run by a gear with double link chain. the pto shaft looking piece keeps getting the teeth stripped off it. the pump is not stuck because you can spin it by hand. when using the tractor it will work then the engine stalls out and it wipes out the part. can anyone help??? we are left clueless he doesn't have a comp and this is how he described it to me. any info would be appreciated. or if you need more descriptive info you can reach him his name is steven palmer at 1-413-786-3434 if it will be easier thanks in advance!!!

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11-08-2001 20:01:28

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Re: Allis Chalmers in reply to Felix, 11-08-2001 19:30:13

Sounds like a pressure relief valve problem to me. The PRV should open when the hydraulics stall instead of killing the engine. Sorry I dont know that particular machine to tell you exactly where the valve is located. They are usually near the control valves . Guys?

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steve

11-08-2001 20:17:14

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Re: Re: Allis Chalmers in reply to cj, 11-08-2001 20:01:28

I agree with cj. I am not a 610 expert, but the hydraulic drive you described with the double row chain is common. if your control valve has a problem, or hose back to the tank is blocked then you will build up way too much pressure in the hydraulic pump. as the pressure rises more engine horse power is required untill the pump pressure demand is so high the engine can not develope the HP and it dies, or rips the teeth off the drive sprocket as you described. check the oil return hose to the tank, the valve outlet, and the pressure relief for the hydraulic valve.

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