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1070 powershift

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05-08-2009 20:04:24

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Noticed the surge was missing when stepped on inching pedal. put it into reverse, did not move...then all at once...reverse...about a 2-3 second delay. Moves in all forward ranges, hydraulics ok. Power steering ok. Any ideas what is wrong?? I am going to try adjusting the inching pedal first as this tractor has a cab. If that does not fix it I intend to tear the floor apart and look at the spool assembly. Has to be a problem with C-4, right?

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05-09-2009 05:03:26

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 Re: 1070 powershift in reply to Triplerange, 05-08-2009 20:04:24  
You are on the right track in you diagnosis. Try the hitch during the 2-3 second delay and see if the hitch is dead while it is not moving. The earlies RPS 34"s had piston seals that would relax and allow this to happen, an updated seal kit added tensioning wires to expand the seals, that helped. The later units used o rings as expanders and square cut seals but these were not compatible with the old pistons. I always replace the pistons and use the later seals when I do a PS job. I"m guessing that the C4 seals are laying down and then the oil volume will cause them to stand up and seal eventually. I had one that had a cracked c1-c4 carrier so if you have to split it check it carefully. As you mentioned previously check the spools to see if you are getting complete travel on both. A pressure gage in the c2 and c4 ports while the malfunction is happening should give you some insight. mEl

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05-10-2009 16:09:16

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 Re: 1070 powershift in reply to mEl, 05-09-2009 05:03:26  
Thanks, Mel. It's working like normal now. I imagine the spool might be sticking. As far as I know this tractor has never been split but I am the very recent second owner of the tractor. Have you seen wierd things happen when the oil gets hot?

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