Got a question on the 856 PTO....

Dan Swanson · Jun 8, 2008

Borrowed a 15' three bladed JD bat wing mower yesterday to do so mowing on the CRP strips. With engine just off idle I would engage the pto and it would take about five seconds to get things going. It put a bit of a load on the engine. A couple of times during the day I engaged the pto at mid throttle and I would take a longer time to get it going. Am I safe to assume because of the weight I was starting this is acting normal? I only had one place where I got into some really thick cheat grass it slowed the mower down but didn't really slow the engine down accordingly. The pto was slipping, I could see it was. But based on the load do you guys think there might be a problem with the pto clutches or might the mower be too much of a load in the really heavy stuff. Other than that one time, I mowed thru 3' tall rye and it mowed it just fine.

Thanks, Dan Swanson

the tractor vet · Jun 8, 2008

I would say that you have low clutch lock up pressure and if she slipped thru the clutch pak then it will not be long before it will be time for a rebuild . Now the down side is that you do need a few things to do a rebuild , one is a Spring compressore to Put new sels in he piston , and ya need a special fitting to screw into the test port and a gauge that can read atleast 600 lbs.. When you do get into to it having a cherry picker to help ya remove and install it as when removing the pto you must tip the rear of the unit down so not to bang and damage the pick up tube plus it's a bit heavy . If you go back into the archives i posted the part # for the special test fitting and this fitting can be bought from Case I H . On your tractor i would install the heavy duty clutch pac kit then set the lock up pressure with the hyd . oil warm at 245 lbs . If you do not have atleast and I T manual then get one for your tractor and read the section on the pto it will explain how to set the pressure .

Anonymous-0 · Jun 8, 2008

Dan, That is not normal, it should engage like any other clutch when the lever goes overcenter and it should kill the engine long before it begins to slip. Take it to an experienced mechanic, you propably need a clutch pack. He will need the whole tractor because the hydraulic pressure has to be adjusted when installed. They are not real exspensive, I think in the $5-600 range. Good luck, Chuck

mazemeister · Jun 9, 2008

On the special fitting for the test plug- i bought a new plug from CIH, removed the o ring, drilled a hole thru the middle, and brazed it to a pipe thread fitting. now it fits my gauge with pipe thread. it is possible to compress that big spring with some screwdrivers and a helper, but CIH makes a special tool that you bolt onto the housing to compress that spring and remove the snap ring. anyone know the part # for that tool?

the tractor vet · Jun 9, 2008

NO it is not and one can make a spring compressor with some all thread and a plate and a pice of pipe with a big notch cut out of the pipe for access to the snap ring or you can fight it into a press and make up the pice of pipe with the notch cut out . My first test plug was made the same way but i made the mistake of letting someone BARROW it and ended up just buying two new ones and stopped the LENDING of tools , now if ya want to BARROW my tools ya have to RENT ME and the tools .

Got a question on the 856 PTO....

Dan Swanson

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the tractor vet

Well-known Member

Anonymous-0

Well-known Member

mazemeister

Member

the tractor vet

Well-known Member

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