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Reload this Page New 125 hydro
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Old 05-25-2011, 10:25 AM
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cubby123 cubby123 is offline
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Default New 125 hydro
Well, I will first update everyone on it, I painted the hood and grill yesterday due to some rust, just didn't want it getting any worse, now gotta tune the carb tonight because it only runs good on half choke. Now, my question to you guys is, how should I go about diagnosing the hydro in it. My great uncle said he thought the valves were sticking, but before I go taking it apart I want to know if anyone's had the same issues. When I push the lever forward I have to push it all the way up to get it to move, but after I do, it will shortly just take off on me and start going really fast. Then when I go to put it in neutral it will hop slowly into reverse. The reverse on it just creeps along and I have to keep the hydro lever held back. Does this sound like valve problems? I am planning on replacing the fluid and filter but I want to try to diagnose if thats the problem first.
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Old 05-25-2011, 04:53 PM
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Sounds more like you need to do a trunion repair and then adjust the hydro linkages per the manual.
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1973: 128, ag tires, 3pt. lift, spring assist, lights, 42" Deck

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Old 05-26-2011, 12:03 AM
Methos Methos is offline
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Sounds more like you need to do a trunion repair and then adjust the hydro linkages per the manual.
Sound like sounds advice to me!
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Old 05-26-2011, 09:45 AM
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Sounds more like you need to do a trunion repair and then adjust the hydro linkages per the manual.
Ok I will go get the manual from my friend tonight, this may sound amateur (which I am) Will I have to take out the whole rearend for the repair or can I get away with taking of the fenders, etc.
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Old 05-26-2011, 10:53 AM
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Ok I will go get the manual from my friend tonight, this may sound amateur (which I am) Will I have to take out the whole rearend for the repair or can I get away with taking of the fenders, etc.
If you have to do the trunion repair then you'll have to split the tractor if not pull the fenders and seat pan and everything will be right there. You'll be able to check out the trunion from there as well. Great time to change the hy-tran as well.
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Old 05-26-2011, 10:59 AM
Methos Methos is offline
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Well, I will first update everyone on it, I painted the hood and grill yesterday due to some rust, just didn't want it getting any worse, now gotta tune the carb tonight because it only runs good on half choke. Now, my question to you guys is, how should I go about diagnosing the hydro in it. My great uncle said he thought the valves were sticking, but before I go taking it apart I want to know if anyone's had the same issues. When I push the lever forward I have to push it all the way up to get it to move, but after I do, it will shortly just take off on me and start going really fast. Then when I go to put it in neutral it will hop slowly into reverse. The reverse on it just creeps along and I have to keep the hydro lever held back. Does this sound like valve problems? I am planning on replacing the fluid and filter but I want to try to diagnose if thats the problem first.
After reading this again it sounds like you might have loss the springs and pin-spring guides part # 911-3033. Mine acted the same way. I had to go all the way forward or reverse before it would do anything and I couldn't find neutral with out hitting the brakes.

Trying to email myself a pic of it now.
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Old 05-26-2011, 11:00 AM
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If you have to do the trunion repair then you'll have to split the tractor if not pull the fenders and seat pan and everything will be right there. You'll be able to check out the trunion from there as well. Great time to change the hy-tran as well.
So when checking out a hydro, what are some things I should check for wear before putting it back together?
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Old 05-26-2011, 11:23 AM
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Here's the pic I was trying to find. There's a write up on the trunion and repair posted. I'll see if I can find it for you.
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Old 05-29-2011, 08:25 PM
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Here's the pic I was trying to find. There's a write up on the trunion and repair posted. I'll see if I can find it for you.
This woulda helped the other day had i gone back online, I split the tractor and found the problem. The trunnion and damper spring setup was mickey moused on. The small damper spring and ends there were missing and the big spring was mounted between the trunnion vertically and was wiretired on. I fixed it and replaced the drive shaft while art it and she runs and moves good now.
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Old 05-29-2011, 09:01 PM
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Hey, glad to hear you got it fixed up. Thanks for the update..
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10" moldboard plow

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