Backhoe 510 D won't move

[farmalls]

Hi all I like this site . Probably like most here I finally signed up because I have problems.

My backhoe has always had good power and strong hydraulics with no noticeable lag in shifting. I got out to hook up a chain and got back in and
it wouldn't move but wheels were free. (Park brake had quit working early this winter and I had to put a bigger fuse in or it blows fuse ) I might have 2 problems . Long story short with all tires in the air they will turn in reverse ever so slow in 1st and 2nd gear no matter what position FNR lever is in. On the ground driveshaft will spin in reverse if I give it some throttle then stalls out and spins the other direction and stops. (Like it is relieving a slight pressure that has built up ). But no pull down on the engine whatsoever. Thanks in advance for any ideas where I should start .

 

[chevy791979]

Is the reverser working? Clutch disconnect on the loader lever stuck? Ring gear rivets had been known to fail back in the day. But most were fixed under warranty or a PIP

 

[chevy791979]

And putting a bigger fuse in any circuit is not good practice. The park brake is hydraulic released. I.E. uses a solenoid. The solenoid for the PB is probably having high resistance causing your fuse to pop. I'd take it off and check the resistance value of the coil.


How much does the drive shaft move when to tires are on the ground?

 

[farmalls]

with tires on the ground the drive shaft will make just a couple of rotations before it stops.


Correction : driveshaft won't turn with tires on the ground and transmission in gear. With transmission in Neutral drive shaft will spin in reverse direction, When I slightly increase RPMs driveshaft stalls out and wants to turn the other direction, When I lower RPMs it again turns in reverse direction. like fluid trying to flowing to both sides at once under very little pressure a there is no pull down on engine whatsoever.

 

[farmalls]

Thanks for the replies chevy, I suspect it might be reverser or electrical components that control reverser since I only get reverse rotation of tires when it's up off the ground . Since the tractor was so strong and seemingly healthy otherwise and the fact that I got out to hook up a chain on flat ground and got back in and had issues makes me think it's something simple .

 

[chevy791979]

Does the reverser oil smell burnt?

 

[farmalls]

No not at all .

 

[chevy791979]

That's a good thing.

 

[chevy791979]

Next thing I'd check was does the fluid level change running compared to not running?

If so I'd be checking charge pressure And convertor in and outlet pressure.

Are you 100% sure the clutch disconnect is not on?

 

[farmalls]

No I'm not , They seem to click jus fine but that doesn't mean anything , I found where I can order a shop manual for it so I can trace the wires down .

 

[farmalls]

Electrical isn't my strong suit so without a book I'm in over my head . I've read where it's possible the park brake switch could be the culprit , At least for the park brake / FNR fuse blowing. Machine is pretty clean and wiring seems to be protected well with looms and appears to be in good shape what I can see of it anyway.

 

[farmalls]

Thanks again for the tips , Is there a way to bypass the whole electrical system and make sure park brake is backed off and run jumper wires to operate FNR just to try to get moved ? If possible that would be the deciding factor if it's electrical or mechanical . I can't hear or feel any click of the solenoids working on the reverser .

 

[chevy791979]

Thanks again for the tips , Is there a way to bypass the whole electrical system and make sure park brake is backed off and run jumper wires to operate FNR just to try to get moved ? If possible that would be the deciding factor if it's electrical or mechanical . I can't hear or feel any click of the solenoids working on the reverser .

You should have a "cage" bolt that will manually release the brake.
Follow the PB line going to the housing in the axle and you seen a bolt with a jam nut on it. Screw that bolt in.

The clutch disconnect should have a 2 wire weather pack connector at the base of the loader lever. Un plug it and you can then; 1- check for continuity on the switch(should be open when released)(closed when depressed) 2- power to the switch.

The light on the dash is turn on or off by park brake pressure. It uses a normally closed pressure switch that opens around 150+/- psi, in turn turning the light off.