656 PTO

[JWilliams]

Hi all. I have a 656 diesel with a malfunctioning PTO. We had the clutches replaced in the PTO and we"re trying to get the pressure set right and no matter how many shims we add or remove from the back of the PTO unit we can"t get the pressure right. Any ideas? Thanks in advance for any help. We"ve had this tractr since it was new.

 

[pete 23]

The shims are to adjust the PARTIAL engagement pressure and have nothing to do with the full engagement pressure. First off, make sure the spool is assembled properly. See a lot that are not. There needs to be a small thin washer under the bumper spring stop that contacts the shoulder on the spool or you won't be able to feel partial engagement stage. Then, to set operating pressure you adjust the turnbuckle. Many linkages on those models are worn so you cannot get full pressure. They were originally set at 185psi but some have been upped to 235 with a new spool and spring arrangement. The lower 185 is plenty for a 656.