Re: Slow hydraulics on Ford 641D

Posted by Philscbx on November 15, 2006 at 17:38:59 from (4.143.53.62):

In Reply to: Slow hydraulics on Ford 641D posted by Hal/WA on June 12, 2006 at 19:52:34:

For repairing of shafts with worn down areas where the seal
rides, Speedy Sleeve have press fit collars that are thin metal
sleeves that once in place will give the new seal the proper
compression at the seal lips to restore it's function.

This can save you tons of cash finding, or repairing the shaft
itself.

If you go to a bearing supply site and get their seal catalog, you
can update the seal to more modern materials that last longer.

Not only that, but you can use double lips seals that now protect
the shaft from outside contaminates as well.

You also may want to pull out the pressure relief valve. This can
be severely damaged by trash always pumped through it.
This will slow down all your hydraulics by lower flow output.

Take a good look at where the tapered poppet sits against the
seat.
I will bet you $5000.00 this point of contact is no longer sealing
off oil flow like it should.
This device should only flow oil at a preset value by it's spring
and setting of it.

You can repair it easily as I have done, for $0 dollars, or pay out
the nose trying to locate a replacement. Not including the time it
takes you actually have one in your hand.

You already have all the necessary tools, and the system will
work perfect again.

If you want to do this, and have a digital camera to do a real
time event, then email me. After the event, then post here what
took place.

Now, one other item update.
You can always spec out a hydraulic filter thats rated at twice the
output you have and install it on the main return line.

It's the ultra fine metal particles that are forced past the relief
valve that end up changing it's face.
Like sand blasting of plywood, it look really cool, but wrecks
hydraulics.
These same particles are also changing the clearance of the
pump parts, making oil bypass some.

You see this on close inspection of the grooves left behind by
repeated particles getting forced past the hardened steel
components.

Another problem is that some systems on older tractors using
the same oil reserve as the transmission. This will damage
hydraulic parts to the extreme if not filtered.

http://www.hydraulicspneumatics.com/200/FPE/Pumps/Article/
True/6401/Pumps

This link will show some pump designs as well as showing
options.

Usually on swash Plate designs, the pistons are keyed into the
plate to be pulled back and forth. To have them only on spring
return would be unlikely.

Good Luck

Phil
Mpls Mn

Replies:

• Re: Slow hydraulics on Ford 641D Philscbx 17:48:14 11/15/06 (0)

Add a Reply Name: E-Mail: Subject: Comments: Optional Link URL: Link Title: Optional Image URL: Email Notification: If you check this box, email will be sent to you whenever someone replies to this message. Your email address must be entered above to receive notification. This notification will be cancelled automatically after 2 weeks.

TRACTOR PARTS	TRACTOR MANUALS

We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]