Jump to content

Unofficial Home of Old Simplicity & Allis-Chalmers Garden Tractors

Sign in to follow this  
Guest

Reverse Problems w/Simplicity 3410H Hydro

Recommended Posts

Guest
My 3410H, which is about 27 years old as far as I can tell, lacks "drive" or power in reverse. On the least incline it lacks the power to back up, period. On perfectly flat ground it's better, but not the way is should be. Forward works just fine.

Late last summer I carefully adjusted the linkage between the control quandrant and the hydro mechanism, and was able to see some improvement in reverse. The down side was the neutral position on the quandrant was now off center (from the detent) quite a bit.

Essentially, I either have some reverse or an off-center control quandrant. Frankly, being a bit of a perfectionist, neither option appeals to me much.

I'm wondering if anywone has suggestions on what might be required to correct both issues.

Thanks...

Share this post


Link to post
Share on other sites
Guest
One other observation... Once the tractor gets going in reverse it builds up speed and works fine. It's just getting it started that's the problem.

Thanks to everyone who replied. There are a number of items suggested that I intend to investigate and try.

I don't know what brand the hydro unit is. I do know there are no buttons on the top, the towing bypass is activated by a vertical rod that moves vertically. I have to clean the unit up good before I can get a better look at it.

Thanks again, everyone!

Kelly

Share this post


Link to post
Share on other sites
Guest
"I fixed a JD 140 that wouldn't go forward by unscrewing the check valves and cleaning them up"

Though I consider myself fairly mechanically inclined, I know nothing about these hydro units.

Therefore, I'm showing my ignorance however, I gotta ask... Where on the unit might I find the "check valves"? Are they located together on the assembly and are they easily removed?

Thanks...

Share this post


Link to post
Share on other sites
Fred
Kelly,
That model has a Vickers, I believe. If it has vertical fins on the pump (input) section, it's a Vickers. If it has radial fins on the top of the pump, it's a Sundstrand. Sorry I misspoke about the freewheel valve, I was thinking of the 'inline' version of the T-66 as on my New Holland.
Fred

Share this post


Link to post
Share on other sites
Guest
It could be the reverse valve on the hydro. The two buttons you push down to free wheel the tractor, one is the forward valve the other is the reverse. This valve could be partially hung up. This valves can be removed from the unit and cleaned up without any other disassembly. Just a thought. Good Luck.

Share this post


Link to post
Share on other sites
Fred
Kelly, that 3410H is a 990757 Landlord with a Vickers hydro, isn't it? If it is, the towing valve is a knob on the side, not two buttons on the top. (No offense, Mike, but I think you're talking about the Sundstrand.) On the Vickers' linkage the only adjustment is the hex turnbuckle for neutral, right? If that doesn't do it, try disconnecting the linkage from the quadrant and shoving it all the way toward reverse, against the brakes, to see if it will make power in reverse. NOTE: This must be done with the tractor securely up on jack stands, preferably with the rear wheels off, and don't get hung up in anything moving. BE SAFE! Usually a hydro will work equally well both forward and reverse. If it won't, it might be the reverse check valve. Keep talking, someone here will help you figure it out.
Fred

Share this post


Link to post
Share on other sites
Kent
I have a 1970 HB212 with Vickers and a '74 712 H with the Sundstrand, my neighbor has a 3414H Baron with the Sundstrand. I assumed the 3400 series were all Sundstrand. Even if you can't get full stroke to the swash plate (full movement on linkage) the tractor should still back up, not fast, but it should not stall out. I fixed a JD 140 that wouldn't go forward by unscrewing the check valves and cleaning them up. Good Luck. Mike S.

Share this post


Link to post
Share on other sites
dlcentral
Kelly, First check that the roll pin in the trunion that goes into hydro is not sheared. Jack trac. up and turn turnbuckle so you have good rev, Your going to notice forward speed will slow down a bit, it's a compromise deal. Once you are satisfied with speeds then put lever in neut. so wheels don't turn either way. Now turn trac off and adjust neutral start switch lever it's slotted so that it depresses switch and presto your in business! Happy Motoring!! DLC

Share this post


Link to post
Share on other sites
Fred
Kelly it sounds like you have the Vickers hydro and not the Sunstrand. I have experienced problems with my Vickers (HB212) under heavy load and found the drive belt was slipping (it was only 23 years old ---) I changed it and everything has worked fine since. Just another thought. --mike--

Share this post


Link to post
Share on other sites
Guest
This topic is now closed to further replies.
Sign in to follow this  

  • Who's Online (See full list)

    • Craig Fortna
    • PhanDad
    • john jacob
    • a_sannine
    • SmilinSam
    • marksr
    • steve-wis
    • Mike
    • Bill725
    • MARK (LI)
  • Today's Birthdays

    1. 720nut
      720nut
      (66 years old)
    2. Joe Scann
      Joe Scann
      (79 years old)
  • Recent Status Updates

    • Paul M.Murphy

      Paul M.Murphy

      Hello glad I got on this site. I hope to upload a couple of photos of my Simplicity Broadmoor 
      Model 707 Tractor. I have replaced all the belts on it and installed a new ignition switch.
      Have a mower deck which was in poor shape , repaced a couple of bushings and welded the
      deck where there was some holes. The tractor and mower deck came from a friend and the 
      mower deck metal was getting pretty thin. Some new metal was put in it and we also undercoated the underside of the deck. This was done by my friend Greg Toulman.
      I have not put the mower deck on the tractor yet, waiting for Greg to come home and give me a hand. Can you please tell me if there is a manual for the mower deck and where I could get one.
      I would also like to get some moon wheel discs as well.
      I will try and down load some photos of the tractor when my wife shows me how to. 
      I really love driving this tractor and also how well it is made compare today's tractors, especially the flexible rear end and the rollers.
      Tell the next time 
      Paul
       
      · 9 replies
    • jbrooks

      jbrooks  »  Talntedmrgreen

      Josh
       
      folowing  this from a link at the downloads.  I just rescued an AC 920 with the lambodini diesel. I can' t download  yet .  Where did you find the PDF copy you posted. . I would like to figure out how to adjust the injection pump. 
      I assume it's a bosche, correct
      · 0 replies
  • Adverts

×