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Tractor Talk

Re: Ford 640 Problem

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Posted by GEO on November 26, 1998 at 19:54:12:

In Reply to: Ford 640 Problem posted by Mark Thomas on November 26, 1998 at 06:43:18:

: I have a Ford 640. My 3-point hitch does not lift all the time and when it does, it doesn't always lift all the way. What could it be?

A bad seal on the Hydraulic pump can cause the pump to lose its prime or simply draw air causing the lift not to operate all the time. A bad oring seal on the dump valve can also do the same thing. As far as not lifting all the way, this can be the sensor pin that slides on the rockshaft cam is probably worn down or worn off causing the linkage to be out of adjustment. If the pin is just worn some, it is possible to adjust the linkage through the side plate that the pto shifter is on. Hope this helps.
GEO

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Subject: Re: Re: Ford 640 Problem

Comments:
: : I have a Ford 640. My 3-point hitch does not lift all the time and when it does, it doesn't always lift all the way. What could it be? : A bad seal on the Hydraulic pump can cause the pump to lose its prime or simply draw air causing the lift not to operate all the time. A bad oring seal on the dump valve can also do the same thing. As far as not lifting all the way, this can be the sensor pin that slides on the rockshaft cam is probably worn down or worn off causing the linkage to be out of adjustment. If the pin is just worn some, it is possible to adjust the linkage through the side plate that the pto shifter is on. Hope this helps. : GEO

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