544J trasmission problems, help

[stmengn]

I am working on a 544j that will not go in reverse, it just failed all at once with no noise or vibrations , of the mechanical sort . Im thinking something electrical but don't know where to start . it travels fine in all forward gears , shift to neutral it will lunge forward for just a second then stop. shift to reverse and it will start to move forward again then stop like the brake is on . JD service techs have been here and say that when in reverse there is still 60 lbs pressure on the forward clutch circuit test port ?? but cant find any codes being displayed to suggest wiring problems . they say some gear in tranny has broke from its shaft causing the problem . sounds crazy to me no grinding or funny noises .no trash in the oil. I just cant believe its not electrical . any help is appreciated
Thanks Andy

 

[JWJDM]

Did they check fnr lever in cab? They wear internally and cause problems try lifting up on lever and shifting machine into reverse.

 

[stmengn]

this machine has the fnr rocker switch in the boom lever and we tried a new joystick assy. which made no difference .

 

[stmengn]

Could there be a way to check the signals going to the 6 solenoid valves on the front of the transmission , it acts like transmission is getting mixed signals and not engaging reverse ?

 

[JWJDM]

Yes but you would need wire diagram to figure out the wires. Did they try to recalabrate trans clutch packs through the dash. Might want to inspect harness from under cab to trans control valve for chafed wires or bad connection at plug connectors.

 

[stmengn]

Thats what is on plan for tomorrow service techs from a different dealer are coming , ill ask about the recalibration . Thanks

 

[JWJDM]

The recalibration might help in narrow down problem to electrical or mechanical

 

[mally]

Try a new FNR lever. Ours had the same issue and after wasting to much time I just got a new lever and it was fixed. I just never heard of a FNR lever go bad after all the years I have been around loaders.

 

[K100E]

what did you find wrong with the 544J? I have one doing the same thing. Thanks

 

[mg2361]

Welcome to HEF K100E!

what did you find wrong with the 544J? I have one doing the same thing. Thanks

This thread is from 2013. Doubt you will get an answer. How about you start your own thread, supply a complete machine serial number and a good description of your issue and when/how it started.