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IH444 lift jerking

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chris mf35

09-21-2001 18:36:36




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dad's 1970 444 gas w/ps. lift started drifting down and jerking back up today.all fluids were changed 6 months ago. if you try to raise lift slowly it jerks about an inch at a time. he has owned it three years and it hase always worked perfect until now. it also goes down fairly fast when tractor is turned off now. ps works smooth and perfect. thans for any help. chris mf35 GOD BLESS AMERICA

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chris mf35

09-23-2001 14:05:13




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 Re: IH444 lift jerking in reply to chris mf35, 09-21-2001 18:36:36  
thanks guys i'll check it out tomarrow after work.



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jld

09-22-2001 17:35:22




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 Re: IH444 lift jerking in reply to chris mf35, 09-21-2001 18:36:36  
Haas has got it just right - the cause of the leak is easy to determine by raising a load and closing off the shut off valve. If you guys are scoring pistons and using a rotary cutter with a tailwheel and a solid 3rd link, it will continue to happen as fluid in the rather small reservoir overheats. With the solid link, the draft control in constantly working. Replace the solid link with a chain. It's ok for the link to pull but not push on the hitch linkage.

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Haas

09-22-2001 08:08:34




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 Re: IH444 lift jerking in reply to chris mf35, 09-21-2001 18:36:36  
Turn off the valve that holds the lift up and then see if the lift still goes down. If it does, then you have a bad cylinder/piston. It it stays up when you close the shut off valve, then your control valve is bad. Likely it is a bad seal on the piston. I had a 424 with this same problem and had to replace the piston, because it was worn to bad to replace the seal. I suppose the 444 is the same as the 424, which had a leather seal on the piston. To replace it with a more modern O ring, you will have to take it to a machine shop to have a groove cut for an O ring. However, in my case, the piston had been rubbing on the cylinder and was worn too badly to do this and the piston had to be replaced with a new one. The part is quite expensive from IH. The mechanic that did my work knew that the parts from a Mahindra tractor would fit. He used a Mahindra lift piston and it fit perfetly and cost less than 1/2 of the IH part. You'll have to drain the fluid and take the top off the hydraulic unit to get to these parts.

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Chums5

09-21-2001 22:05:14




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 Re: IH444 lift jerking in reply to chris mf35, 09-21-2001 18:36:36  

Chris...did they change the hyd. filter also when they changed oil...sounds let a plugged hyd. filter to me....



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