F3 variable speed header drive
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=204566
Printed Date: 25 Dec 2024 at 12:13am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: F3 variable speed header drive
Posted By: Ben (MI)
Subject: F3 variable speed header drive
Date Posted: 15 Dec 2024 at 8:39am
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The variable speed header drive sheave is stuck in the slow position, out against the stop bolt heads on the F3. What is the trick to getting it free, please? My mechanic did this a few years ago but I don't know how he did it. I'm preparing it for sale and hope to have this taken care of. If anyone needs a good F3 with heads I will be listing it on FB Marketplace soon.  ------------- Part time farming with a 1980 7060 and 1984 F3 hydro. |
Replies:
Posted By: SteveM C/IL
Date Posted: 15 Dec 2024 at 12:48pm
| Don't know how it could be stuck. Hyd hose connected and pressure applied while running should move it. It's just a piston. |
Posted By: Ben (MI)
Date Posted: 15 Dec 2024 at 12:50pm
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I'll give it a whack, maybe that's all it needs. Thanks. ------------- Part time farming with a 1980 7060 and 1984 F3 hydro. |
Posted By: DrAllis
Date Posted: 15 Dec 2024 at 3:33pm
| To be stuck in "SLOW" speed, the belt is at the top of the lower sheaves, not down inside the sheaves. Meaning the sheaves are not spread apart, they are already squeezed together. |
Posted By: Ben (MI)
Date Posted: 15 Dec 2024 at 4:01pm
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I thought against the bolt heads or stops is set at slowest speed. I think it's stuck, the speed control rocker switch won't make it change speeds. I guess the switch could be bad. Thanks. ------------- Part time farming with a 1980 7060 and 1984 F3 hydro. |
Posted By: DrAllis
Date Posted: 15 Dec 2024 at 4:35pm
| Those header drives usually require the corn head to be hooked up and running at full throttle to get them to slow down. |
Posted By: Ben (MI)
Date Posted: 16 Dec 2024 at 8:44am
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I couldn't get it to move at all this fall in corn, just ran it. ------------- Part time farming with a 1980 7060 and 1984 F3 hydro. |
Posted By: SteveM C/IL
Date Posted: 16 Dec 2024 at 9:21am
| Against bolt heads on drive pulley will slowest speed. Hast to be running to move especially if speeding up. Sounds like you electric over hydraulic has a problem. Can't imagine it being able to stick unless something wrong in lower pulley. |
Posted By: DrAllis
Date Posted: 16 Dec 2024 at 9:47am
| Seems like the upper sheaves aren't getting the oil released to be able to slow down. I'm thinking electrical, but could be the hyd valve itself. Unplug the hose on the upper sheaves. Then. remove the hose coupler and run the machine with the header running. Oil should squirt out and the sheaves will then slow down. |
Posted By: Ben (MI)
Date Posted: 16 Dec 2024 at 10:02am
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Thank you guys. I will experiment and see what happens. I really appreciate the help! ------------- Part time farming with a 1980 7060 and 1984 F3 hydro. |
Posted By: 8070nc
Date Posted: 16 Dec 2024 at 10:28am
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On my L3 the solenoid coils are bad for getting corroded and not grounding. It could be just that simple. We take a little wire brush on a dremel tool and clean the cup and groundind ring on the coil ------------- 1984 80780 1957 D14 DES 300 with 25000 engine 616 tractor |
Posted By: Ben (MI)
Date Posted: 19 Dec 2024 at 8:34pm
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Thanks everyone, I appreciate all of your help. I tried it again today it worked fine. I assume I had tried it with the header drive off before. Thanks again! ------------- Part time farming with a 1980 7060 and 1984 F3 hydro. |
Posted By: SteveM C/IL
Date Posted: 20 Dec 2024 at 12:06pm
| That would do it. Has to be turning to operate. |