485 Eicher Throttle Tension

[bolesa56]

Hello,
I have a 2004 Eicher 485 tractor. I have a problem with the hand throttle lever returning to idle and not holding a constant throttle position. When this tractor was new the throttle lever would easily hold its position as the tention was pretty heavy. I cannot find any means of adjusting the linkage in way that would increase the tension. This make bushhogging a pain because you have to physically hold the throttle lever to keep constant RPMs where you want, I've since added a spring to hold the throttle plate on the carb open at about 1600rpms which works well for easy mowing. The problem is that I have to get off the tractor and remove the spring for the tractor to return to idle...a bit of a pain.

I'm hoping someone on this board has had some experience with this type of tractor and knows the method to increase the tention on the throttle. These tractors are not common, its a 3cyl air cooled diesel...made in India and sold through local Tennessee Farmer's Co-ops. I don't believe they still carry this model but parts are still available through the local Co-op.

Any help is greatly appreciated!

Andy

 

[Harry in Ky]

Most tractors have some form of friction washer to help maintain throttle position. I'm sure yours does as well, but I can't explain exactly where. I was doing a search just recently for a parts source for a 485, and recieved a response from Keith Pirtle, at the Farmers Co-op in La Vergne Tn, who seemed more than eager to help. He assured me that they can supply any needed parts. I believe if you give them a call at 615 793 8452, they not only can explain what you're looking for, but supply parts if needed.

 

[bolesa56]

Most tractors have some form of friction washer to help maintain throttle position. I'm sure yours does as well, but I can't explain exactly where. I was doing a search just recently for a parts source for a 485, and recieved a response from Keith Pirtle, at the Farmers Co-op in La Vergne Tn, who seemed more than eager to help. He assured me that they can supply any needed parts. I believe if you give them a call at 615 793 8452, they not only can explain what you're looking for, but supply parts if needed.

Thank you Harry,
I'm going to give him a call this week, we've ordered a few replacement parts through the LaVergne Co-op in the past but I've never spoken to him about a repair issue, I'm not sure they do any servicing there. Anyways if there is a tension washer on this machine it very well may have vibrated comepletely off, I've followed the linkage from each direction and cannot find anythign that looks like it could be used in that manner. My spring fix works but it's less than ideal. I'll let you know what I find.
-Andy

 

[bolesa56]

Harry,
I did call and speak with Keith, he looked at his computer and confirmed there was a spring over the throttle shaft and that it looked like the only access was by removing the dash.

Well this weekend I finally got around to taking a serious look at this throttle issue. The throttle on this model is an L shaped lever that feeds through the dash just below the steering wheel. I was able to remove the upper and lower dash components. This Eicher has a large spring that is wound around the throttle shaft...below the spring is an adjustment nut and below that a lock nut. To adjust you simply loosen the lock nut and tighten the preload nut at the bottom of the spring and retighten the lock nut. In my case the spring looked to be already tightened about as tight as it could be...the spring was already compressed as far as it could go...which is why the tractor originally had heave throttle tention. Anyways, a previous issue with this tractor was that when you shifted into reverse and the tractor was warm...a small stream of fluid would squirt from the gear shift linkage plate between your feet upwards. This oil appearently coated the underside of the dash, all the wiring, the throttle spring, etc. My guess is the oil caused the linkage to slip instead reguardless how much tention the spring had on it. I sprayed a liberal amount of carb cleaner on everything under the dash to remove the film of oil and the throttle began to hold it's position perfectly. So I re-installed the dash and everything seems to be working as it should...oh and I repaired the gasket on the shift linkage plate so it doesn't squirt any more oil.

Next I will be removing the rear wheels to swap the inner hub in order to get a wider stance, and also looking to replace the smallish front wheel/tires in order to be able to carry round bails with the front lift without so much stress on the tires.

Take Care
Andy