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Angry Bear

Sunstar hydro control

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Angry Bear

Hey guys. A guy posted a few days ago about his 9020 speeding up on him instead of it just maintaining speed. I have the same issue, but with my Sunstar. He was advised to check the detent, but since the Sunstar has a different setup, would I be looking for the same thing?  I looked at diagrams of the control and don't really see what I should maybe adjust or tighten. It's really kind of annoying, since I have to keep a hand on the speed control at all times. Any suggestions would be greatly appreciated. 

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buckdan

Hello all

I haven’t posted in a long time but I be been reading posts here just about everyday as a guest. What a wealth of information. 

Just wondering why nobody responded to angry bears problem with speed slowly increasing on its own. I have the same problem with my DA 1920. Can’t figure out why it speeds up? Somebody must have experienced this same problem at one time? Any advice or troubleshooting I can do would be greatly appreciated, 

thanks in advance

9CF89F0F-9151-43F7-84A8-E4C1AA9F96DB.jpeg

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MikeES

I have not had this issue with the 1920s that I have owned (both very briefly).  But there must be a friction point on the linkage, that is adjustable to prevent the lever from moving on its own.  If the tractor is speeding up or slowing down without the lever actually moving, then it could be other issues with the linkages (loose/sloppy connections).

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buckdan

Mike,

The DA giving me this problem is the 1691392. When I’m in mid to WOT, as a angry bear stated, I have to hold the throttle to keep the speed I want, otherwise she’ll just run off to full speed. My other DA 1920 1691020 has never had this problem. Do they have different linkages set up? 

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dhoadley

The throttle on my A/C917 was floating and I was told to look in the back of the dash tower for a friction plate held on with a single nut. I tightened up that nut (several times by trial & error) and now my throttle stays where I put it. Good luck, Dave

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buckdan

Interesting you had this problem on your AC917, I guess same throttle assembly. I’ll try tightening that friction plate nut and hope for the best, it sure is annoying when cutting grass and it just wants to speed up. Thanks Dave.

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Tom45

Is it the engine speed that is changing or the hydrostatic?  I am not familiar with the Sunstar, but on the 916 (7116) series that has the Sunstrand series 15 hydrostatic, there is a spring in the linkage to the hydrostatic.  If you work the hydrostatic linkage with the engine OFF you can see that the spring often bottoms before moving the arm on the hydrostatic.  Some of us have added washers to limit the spring travel of the linkage.  

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SmilinSam

Theres a friction lock setup on the Sunstar motion control lever, but its been too long ago since I adjusted mine Cant remember how its done. Pretty sure you have to take the side panels off to get to it. I dont think its too complicated.

Theres also a friction setup on the throttle lever too

Edited by SmilinSam
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Angry Bear
12 hours ago, Tom45 said:

Is it the engine speed that is changing or the hydrostatic?  I am not familiar with the Sunstar, but on the 916 (7116) series that has the Sunstrand series 15 hydrostatic, there is a spring in the linkage to the hydrostatic.  If you work the hydrostatic linkage with the engine OFF you can see that the spring often bottoms before moving the arm on the hydrostatic.  Some of us have added washers to limit the spring travel of the linkage.  

On mine it's the hydrostatic speed for sure. If you don't keep your hand on the hydrostatic control lever, it'll just ramp up to full speed. 

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