JD 750

[Jjmw]

Hey, I have a 1985 John Deere 750 that I have to hold the diff. lock lever up to get it to engage. If I let go it slips out. Ant ideas?

 

[jd110]

The diff lock is designed to disengage by itself. If traction is unequal, it should hold itself in, but as soon as traction equalizes, spring pressure will disengage Sounds normal to me.

 

[California]

Hey, I have a 1985 John Deere 750 that I have to hold the diff. lock lever up to get it to engage. If I let go it slips out. Ant ideas?

You really mean you have to pull up on the lever, pressing it down does nothing?

Take a look at this old thread describing my repair to the same type of difflock mechanism. (And see post #7, it shows my photo that is no longer visible in post #1). The repair was simple, just weld some metal back into a worn groove and grind/polish it smooth.

The thread discusses a Yanmar of the same era, made by the folks who built the Deere 750.

 

[Jjmw]

You really mean you have to pull up on the lever, pressing it down does nothing?

Take a look at this old thread describing my repair to the same type of difflock mechanism. (And see post #7, it shows my photo that is no longer visible in post #1). The repair was simple, just weld some metal back into a worn groove and grind/polish it smooth.

The thread discusses a Yanmar of the same era, made by the folks who built the Deere 750.

It works when I press down and when I lift up. If I don't hold it in either position the back tires won't spin.

 

[prs]

You may have a broken spur gear shaft in one of the final drives.

prs

 

[Jjmw]

I've pulled both rear axles, no damage to either one.

 

[Barry 1]

Are you trying to say that it won't move at all,unless you lock the diff.???

 

[Jjmw]

Lock the diff. or put it in FWD.

 

[Barry 1]

Then you probably broke one of the pinion shafts. One on each side. The little shaft that goes from the brake drum to the diff.
Wengers of Meyerstown has used ones. CH15033(LH) $175 CH15034(RH) $150 They call it Bull Pinion shaft.

 

[joecdeere]

Shoot me your email and I'll send you a PDF of the Deere tech manual
Sounds like time to do some reading

Joe

 

[Jjmw]

Thanks for the offer but I just purchased a manual. Found the problem, the six bolts that hold the carrier to the ring gear were all sheared. new bolts should be here early next week.

 

[JD 970]

Very nice Joe! I looked high and low for a PDF of the service manual for my 970 and, having not found it, ordered a hard copy and will cut it apart and digitize it into a searchable PDF. Nice to see you helping out like this.

Joe

Shoot me your email and I'll send you a PDF of the Deere tech manual
Sounds like time to do some reading

Joe

 

[brant750]

Shoot me your email and I'll send you a PDF of the Deere tech manual
Sounds like time to do some reading

Joe

Hi joecdeere
is the offer for the tech manual open to all?
i could really use it if its for the older 750s mine is a 1984

 

[brant750]

bumped up

 

[joecdeere]

gladly, just need your email

 

[brant750]

sent you a private message joecdeere

 

[prs]

Then you probably broke one of the pinion shafts. One on each side. The little shaft that goes from the brake drum to the diff.
Wengers of Meyerstown has used ones. CH15033(LH) $175 CH15034(RH) $150 They call it Bull Pinion shaft.

Exactly what I was saying. I broke my right one the first season, it must have been flawed. The dealer was small and very challenged, I had him send the part and gasket and maybe some other parts and I repaired it. That was winter of 1983, so memory not really crisp.

prs