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Tractorholic
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Discussion Starter · #1 ·
Does anyone have an idea what the problem could be!? Maybe I'm missing a return spring? Thanks
 

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Red Tractor Nut & Diesel Addict
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I the pedal can still be manually put through it's whole range, forward to reverse, then likely either the spring is broken, slipped out of place, or missing entirely.
 

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Tractorholic
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Discussion Starter · #3 ·
Anybody got a picture of how the spring/mechanism should look? I have to shift it into neutral everytime I dismount the tractor.
 

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Red Tractor Nut & Diesel Addict
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Anybody got a picture of how the spring/mechanism should look? I have to shift it into neutral everytime I dismount the tractor.
Does yours have an Eaton (round with finning), or Sundstrand (blocky, no finning) hydro unit?
 

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Premium Member
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seeing that yours is the sunstrand if you look under the tractor's, left side[sitting on the tractor] you can see the return spring . It's adjustment bolt/nut./stud can be accessed by removing the floor cover.If the spring is still in place then the problem is inside the hydro unit.Whats more then likely happened is that the roll pin that connects the shaft to the swash plate has broken.So its not letting the hydro go back into the neutral position.I'll bet that you can find the neutral with the forward/reversing pedal..Mine had broke and the only way to repair was to do a tear down to repair the problem.When I did mine I installed two roll pins one inside the other,never had a problem after. Sorry don't have any pics of the spring.Larry
 

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Luke, I can get you pictures of mine if you want them as I operate my tractor without the center cover over te driveshaft ( been to lazy to reinstall it)

Massey Driver is correct and what he described is what I found in my Sundstrand when i first bought it. The roll pins had been damaged at the swash plate and it was un-controllable.

PLEASE NOTE********** if your roll pins are damaged DO NOT BE TEMPTED TO INSERT ONE IN THEIR PLACE !!!!!!

To do so will be the greatest regret of your life when the next tear down comes do. I have attached in this website an overhaul process for the Sundstrand and its pretty clear how to do it what to look for and lots of pictures.

Do not be intimidated by the fact its a hydraulic pump.

If you have a question or need more information don't hesitate to ask. I bit my teeth and learned a lot about the tractor itself. Now I have to learn an equal amount by the lousy design of the mower deck. I am not impressed with the deck mounting and how its carried. Bottom line is the deck doesn't mow level. But i will find that solution later.
 

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Tractorholic
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399 Posts
Discussion Starter · #8 ·
Thanks for the replys.....yeah any pictures of where the spring hooks would be great! When I bought the tractor the spring was gone so I bought one from Massey dealer but didn't cure the problem. Not sure if I have it installed in right spot though. When moving the pedal with engine off the linkage seems pretty stiff, should it move with no resistance? Maybe ill try spraying it down with penetrating oil. I'm sure the problem is the pin......I never get lucky! Lol do you have to remove hydro from tractor to fix problem? If so I will probably rebuild it while its out since it will be on the bench anyway. Are parts available? Any shops carry exchange hydros? Thanks Luke
 

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Red Tractor Nut & Diesel Addict
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I'll go get some pics. My 1655 has the tunnel cover still off. The pedal should easily return to neutral, engine running or not.
 

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Tractorholic
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Discussion Starter · #11 ·
Okay, I have the short spring that runs vertical installed in the same spot. That's the one that was missing when I bought the tractor. What's the long spring that runs front to back above it for? Did you add that for something else? Mine doesn't have that one on it.
 

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Red Tractor Nut & Diesel Addict
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Okay, I have the short spring that runs vertical installed in the same spot. That's the one that was missing when I bought the tractor. What's the long spring that runs front to back above it for? Did you add that for something else? Mine doesn't have that one on it.
I didn't add the horizontal spring, but not sure if it's OE or not. I believe it is a brake pedal return spring, or at least I think that's what it was placed there for.
 

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Red Tractor Nut & Diesel Addict
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Okay, was hoping that spring missing was the answer! Thanks!
Went & double-checked....the spring in question is simply a brake pedal return. Luke, when you move the pedal, does the shaft from the side where the return spring move equal to the side the pedal rod connects to? If not, it's an internal pin problem for sure.
 

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Tractorholic
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Discussion Starter · #16 ·
Not sure, ill have to remove my tunnel cover and check that out...... Gonna try mowing this afternoon......will check it after I get done this evening and let ya know.
 

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Here's a pic of the hydro showing the internals.As you can see each side of the swash plate is mounted to a shaft with a roll pin.So if the roll pin breaks on the side of the netural linkage then it won't self center.Like Daniel mentioned check to see if that both side move when you applied the forward/reversing pedal.That way it'll let you know if the roll pin is broken.Hope this helps.
 

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Tractorholic
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Discussion Starter · #18 ·
Well guys under further investigation the shaft on both sides of the hydro move when the pedal is moved forward and back. Another thing I noticed(don't know if its related to this problem)was the parking brake won't hold. I'm guessing my brake band is probably wore out or needs adjusted up!? Has anyone tried ordering brake parts and hydro parts through Massey/Agco?
 

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Hey luke its actually got 2 brake pucks.When I did mine I used the brake pucks out of a snowmobile.It was from a Polaris I believe.The diameter was the same,only I had to cut a flat spot in the one side to match the old one.The flat spot keeps the puck from turning.Another thing to look for is to make sure that the brake disc is floating on the shaft.It's designed to slide on the shaft as the pucks wear the disc moves.Also check to make sure that the small balls are still in and under the actuating lever.You can adjust the brakes by turning the nut in,its accessed thru a hole in the frame between the tire and frame on the left side.

The tractor not going into neutral could also be that the nut # 3 in the linkage picture could be missing or the bolt broken. Hope this gives you more to look at and check. Larry
 

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