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John Deere 455 running slower?


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#1 JD455noob OFFLINE  

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Posted January 26, 2018 - 09:39 PM

Does anyone know why a 455 would seem to run slower than normal during normal operating with no pto? It starts fine, seems to still have all the power. I had it in the shop a few weeks ago for a bad thermostat and a leak in the transaxle and when I got it back it seems that it doesn’t move as fast as it did. It’ll accelerate quickly and then slow down to a consistent speed. any ideas?
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#2 JDBrian OFFLINE  

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Posted January 27, 2018 - 11:37 AM

I would check the hydro linkage. There could be some slack somewhere, wear or binding perhaps. There is also a damper that can cause troubles if it wears out. The parts diagrams should be on jdparts.com.

#3 chieffan OFFLINE  

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Posted January 27, 2018 - 12:13 PM

Not to be a smart A - -  but I move that way all the time any more.  Start out quick and then down to half speed or less.


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#4 jms180 OFFLINE  

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Posted January 27, 2018 - 04:26 PM

Not to be a smart A - -  but I move that way all the time any more.  Start out quick and then down to half speed or less.

Me also only can go in low gear  :rocker2:



#5 Cat385B ONLINE  

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Posted January 27, 2018 - 05:54 PM

How's the transmission fluid level? Was it purged after it was opened up to fix the leak?


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#6 JD455noob OFFLINE  

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Posted January 27, 2018 - 06:12 PM

The fluid level is good, I’m gonna say it probably wasn’t purged. Would that cause it to move slower?

#7 Cat385B ONLINE  

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Posted January 27, 2018 - 08:09 PM

Only initially, the system will purge any air in it after a max of a few minutes of run time.

#8 WNYTractorTinkerer ONLINE  

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Posted January 27, 2018 - 08:45 PM

The fluid level is good, I’m gonna say it probably wasn’t purged. Would that cause it to move slower?

Yes-  The hydro would be noisy (Pump)  Start the tractor and engages the tranny bypass lever behind the RR wheel.  It will purge air out of the pump.motor..  Just don't do it for a long time as the fluid will heat up and bad things happen after that..  

 

What type of fluid did you put back in the tranny??  

 

Pull the seat pan and inspect the linkage for wear and adjust/replace as needed..

 

Next is a pressure test on the pump if not any problem or improvement..  

 

All I got for now..


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#9 mowingmachine OFFLINE  

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Posted March 18, 2018 - 09:52 PM

Does anyone know why a 455 would seem to run slower than normal during normal operating with no pto? It starts fine, seems to still have all the power. I had it in the shop a few weeks ago for a bad thermostat and a leak in the transaxle and when I got it back it seems that it doesn’t move as fast as it did. It’ll accelerate quickly and then slow down to a consistent speed. any ideas?

. I did a replacement of the hydrostatic pump of a John Deere 455 diesel as well the reason for it was the hydrostatic pump had internal issues that meant that when they got hot the oil did not flow consistently out of the hydrostatic pump into the transaxle the pressure and flow drop by 38%. apparently this is a common flaw on a 455 diesel The exact diagnosis must be done by dealer as they are the only ones that the complete guage package in order to be able to do that hope this helps thanks. The short term first fix though is to dump all the transaxle oil install a new filter and refill it and make sure it’s absolutely up to the top of the film work when operating it thanks




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