Jumping out of gear

cuttman

Member
I have a jd 50 and it has started to jump out of 3rd gear when under pressure. Could this be from a worn gear.
 
Yes , that is the PLOW gear the CYCLE BAR mowing gear Generally the MANURE spreading gear and general all a round working gear every 50 used for daily work has been known to do it sooner or later, down a steep hill with a 100-125 bales on a wagon can be very dangerous if caught off guard.If you live on level ground you more than less will never experience it. Sell it to someone in hill country such as the EAST and he may very well get hurt very badly if inexperienced .
 
Very common on all single stick A & B tractors. They say a shaft gets where it bends a bit letting that happen. They also have a lock they put in to stop that but it does not work. We spent all the mony to have that done 35 years ago and wasted money. The only cure is a piece of wood, in the case of the A & B it was a 1 x 2 stuck in slot to hold the shift lever. Used that piece on hundreds of acres working ground. If the engine made more power it would have done it in 5th as well. Low it could do it as well but that was hardly ever used under a transmission load, usually only a POT load so was not a problem then.
 
Worn bearings are a prime cause of slipping out of gear. The teeth on those gears get a ever so slight tapper to them over years of use that will cause them to slowly walk out of gear.
 
Deere addressed this problem in Service Bulletin 238, March '56, which outlined 3 different kits and instructions for 50,60, and 70 models. I doubt the kits or individual parts are still available from Deere. Like Leroy said make a block of wood that you can drop in the shifter slot to keep it locked in gear.
 
CARLYLE- Really? You did all those things in third gear? Back when I was running those 2-cylinder tractors we did all that in 5th gear except with the R since it only had a 5-SPD, then I used 4th. Too bad Deere never put a decent road gear in ANY 2-cyl. 10-11 mph just didn't cut it.
 
Yes Carl ,the same was here with our 60's and B's,, we worked our 60's hard back then but never had trouble with them working out of 3rd gear like the B's... we plowed in 3rd as well as mowed hay, pulling the #25 combines, discing, raking hay, cultivating the last time through 3rd gear half throttle and a 12 MPH going home gear was a bit slow, but we never got that far away from home and there seemed to be no hurry back then..
 
What you are saying is BS put new brgs on the bottom shaft and find the inter lock kit and it will be all good, been there done that
 
According to TractorData, all 6-SPD B's, 50, 520, 530 were 10 mph in 6th. Late 6spd A's were fastest at 13 mph and 70's were 12-1/2 mph.

BTO I worked for had a late A & 60 that didn't seem very fast, early 4-SPD G that ran 6-1/2 mph in 4th, used them all at one time or another hauling manure. Longest day I ever worked for him was rotary hoeing 80 acres of soybeans with a 6-30 hoe behind the 60 running in 4th gear. Couldn't quite pull it in 5th.
 
The early 6 speed (2 stick) A's and B's run between 15 & 16 mph on the road. The problem for the early 6 speed B was that I couldn't pull
anything that fast, it didn't have enough power. I had one of those B's in my teens and was frustrated with it for only being able to pull
loaded hay wagons on the road in 5th gear. The single stick 6 speed tractors were only 12 mph at best and they had much better power than
than the two stick units. I trade my first B on a 70 Diesel.
 
Leroy you got SCREWED by the dealer! they either did not put the parts in at all, or royally messed them up! The interlocks work 100% perfect even on badly worn parts- I've done several & use one in tractor pulls. Its a 48 B with 52 HP & the locking shifter parts from a 530. it pulls in 3rd gear at 5mph up to the 5500# class.
 

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