Backhoe Transmission Will Not Engage NH 555E Backhoe

[audieo]

I took out the round metal screen out of the side of the fluid reservoir and cleaned it. Maybe that's what you mean? There's also a spin on filter real hard to reach. Replaced that too.

 

[EddieWalker]

The spin on filter inside the hydraulic tank is the one I was talking about.

 

[TractorTech]

Guys, that filter in the tank, is for the loader/backhoe hydraulics. It has absolutely nothing to do with the transmission. The transmission filter is hanging on the side of the transmission.

 

[eKretz]

I agree with TT, sounds like an electrical issue. My 555D has a little "computer" that is basically just a shift control module. Shift solenoid not getting activated sounds like the problem you're having if you're getting no reaction anywhere. I would check the shuttle fuse, first thing. Then the cutout switch circuit.

 

[Dman1981]

Most of those shuttle valves have manual pin you can push with pick to see if you have electric or oil problem manually pushes valve across to engage trans just because you have power does not mean spool is moving also have had a few of them stuck over the years

 

[Rawicklund]

Same issue right now. I believe the shuttle valve to be stuck.I unhooked the wires and checked voltage. Each connector had 12volts in one direction and zero in the other so that appears good. Trying to figure out how to remove and free up. The 4 holes in the top look to be mounting bolts but no hex or no torx, so I’m not sure how to remove to fix…..will find out in the next few days.

 

[TractorTech]

Those are actually socket head bolts requiring metric Allen wrench

 

[Rawicklund]

Those are actually socket head bolts requiring metric Allen wrench

Nope…I assumed they were socket heads also..I cleaned them out yesterday…no luck. The center hole, which was covered by the foil sticker has a hex socket on it. But it is canted to a 25 degree angle so the Allen wrenches I had with me couldn’t reach….they have a hex type nut on each side approximately 22mm that I plan on pulling just to see. But they look more like spool caps. If I can google a pic of the part, that should help. We‘ll see.

 

[TractorTech]

Nope…I assumed they were socket heads also..I cleaned them out yesterday…no luck. The center hole, which was covered by the foil sticker has a hex socket on it. But it is canted to a 25 degree angle so the Allen wrenches I had with me couldn’t reach….they have a hex type nut on each side approximately 22mm that I plan on pulling just to see. But they look more like spool caps. If I can google a pic of the part, that should help. We‘ll see.

Hmm, well that is what the parts book shows. I agree that it looks like the spool is stuck or the coils are both bad which is unlikely.

 

[Rawicklund]

Hmm, well that is what the parts book shows. I agree that it looks like the spool is stuck or the coils are both bad which is unlikely.

If you can see a part’s diagram or mockup……I was wondering if it was possible if it was attached from inside the case? Also was wondering if I could unscrew the solenoids? I have a service manual, but only have the electrical chapter with me.

 

[TractorTech]

Here is the SM pages

 

[Rawicklund]

Here is the SM pages

Big thanks…..just skimmed thru it. But like you said, it says to remove the 4 bolts on top. I should be able to get back out there tomorrow for a better look. I oiled it up pretty good and I’ll bring some brake cleaner out there to double check on the bolts

 

[Rawicklund]

Here is the SM pages

I got back to the Ho a couple days ago. I drilled down and found the socket heads just as you described. It seems they had an epoxy or hard sealant on top of them….. the bad news is they won’t budge. I was able to get a hammer type impact wrench on one of them, but just rounded out hex. I cleaned the other 3 out and put some penetrant on top to let them marinate. My next plan is to get a long drill bit….8-12” and drill them out. The socket heads appear soft, but I couldn’t get 100 % centered over the hole, so I’ll wait for the longer bits and slight modification of access hatch…more later

 

[awhitaker]

I got back to the Ho a couple days ago. I drilled down and found the socket heads just as you described. It seems they had an epoxy or hard sealant on top of them….. the bad news is they won’t budge. I was able to get a hammer type impact wrench on one of them, but just rounded out hex. I cleaned the other 3 out and put some penetrant on top to let them marinate. My next plan is to get a long drill bit….8-12” and drill them out. The socket heads appear soft, but I couldn’t get 100 % centered over the hole, so I’ll wait for the longer bits and slight modification of access hatch…more later

Did you get your hoe going?