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HST stick

Gryantaylor Join Date: Apr 2006 Posts: 4 Park City Utah

2006-04-23          128159

I just bought a B7100 (early 90's) with the HST. So far I have been impressed. I have one problem I haven't been able to solve. The peddles on the HST stick, at first I didn't think I'd mind but it has become a problem and I'd like to make it work correctly. Are there any adjustments? Is a spring broken? Any help would be great. Thank for your time.

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HST stick

earthwrks Join Date: Dec 2003 Posts: 3853 Home Office in Flat Rock, Michigan   Pics

2006-04-23          128160

Generally, the HST variable displacement pump is directly controlled by the pedal(s). All they do is chnage the angle of a swash plate inside the pump. Ususally the pedals are directly connected to the swash plate shaft (SWS). The SWS inside the pump is pressure lubricated. Typically there is a lip seal around the outside of the SWS and from there the pedal assembly connects to that. The first place I'd look is the the supporting pedal pivot or bearing surface--might be a bad, missing or rusted pivot. Also, if it's like my New Holland and it has cruise control, there is a mechanical linkage connceted to the pedal that holds it there with an electromagnet that slides against a steel surface--might be rust build-up on that sliding surface (when mine gets rusty it will make a "squealing disc brake" sound when I go from forward to reverse. After awhile it goes away, sort of.) ....

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HST stick

Gryantaylor Join Date: Apr 2006 Posts: 4 Park City Utah

2006-04-25          128290

Thanks for your suggstions. The transmission seems to function correctly but the foot lever sticks instead of returning to nuteral. I took some of the sheet metal off and it looks like problem is in the linkage not the tranny. I'm going to clean up and oil the linkage hopefully that will help. Does anyone know if there is an adjustment on the spring that is suppose to bring the lever back up?
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HST stick

earthwrks Join Date: Dec 2003 Posts: 3853 Home Office in Flat Rock, Michigan   Pics

2006-04-25          128338

Forgive me for not knowing your application, but for what it's worth:

Generally true HST CUT's don't have a (gear) transmission per se. (My NH TC33D has a variable-displacement pump controlled by the foot pedal which hydraulically drives a fixed displacment motor which drives a "range" gear box (which is a carry-over transmission) which drives the rear axle.)

To address your last post, the shaft into the "tranny" (which it probably is not) should be the swash plate control shaft. Generally these are not necessarily spring-loaded to neutral; most are designed to slowly return to near-neutral on their own and can be spring-assisted with or without a hydraulic damper so that you can't make it go fast or change direction quickly so as to not cause damage to the drivetrain or throw yourself off the machine. ....

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HST stick

Gryantaylor Join Date: Apr 2006 Posts: 4 Park City Utah

2006-04-26          128362

Prehaps I should rephrase. I've driven a number of tractors including 4 or 5 HTS's but I'm not the familiar with the lingo. You are correct I don't have "gears." Learning from the posts above the SWS shaft is sticking which causes the tractor to keep moving either foward or backword depending on which direction I pressed the peddle until I manually re center the peddle. All the other HTS's I've dirven will stop when you let off the peddle in short order (you are correct its not instant)

Last night I washed and greased the linkage, that seems to have helped quite a bit. It also appears there is a spring that that can be adjusted but mine is already adjusted as far as it goes.

Does any one know what "usually" causes this problem and what part(s) need to be adjusted. Do I need a new spring, damper, connecting rods etc.?

Thanks for your help, sorry if my question wasn't clear from the start. ....

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HST stick

Art White Join Date: Jan 2000 Posts: 6898 Waterville New York   Pics

2006-04-27          128406

In general the hydro linkage is neglected to much and needs to be lubricated more as well as kept clean. ....

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