656 hydro cont'd

Chshaffer · Sep 1, 2012

First posting of this topic on my 656 was back on June 20. Thanks Pete23 and Allan in NE for you input. Just now getting back to the task of repairing this tractor. (too much farming to stop and repair earlier) The CaseIH parts website did not show the exact parts I had damaged. Allans pictures of the hydro 70 helped but were not quite the same. All of this to say, that after pulling the whole three point hitch casting and remote hydraulic valve assemblies off of the tractor, was better able to see where the damaged tube was orginally fastened. Browsing the net I found a picture from Wengards in Meyerstown, PA of the part. The smaller tube broke loose from the larger. I believe the large tube is a suction tube and the smaller tube is a return line. If this assumption is correct, can the smaller tube be fastened to the bottom of the rearend housing other than in the large tube?
A rubber hose connects to the smaller tube and then on the other end is connected to another metal tube that attaches to the casting that contains the three point hitch hydraulic components. Would appreciate other folks experiences and input.

pete 23 · Sep 1, 2012

I am going to assume the large tube is still fastened solid and only the small return tube has broken loose from the large tube. The tube you are showing in the picture is from another tractor and not yours, correct. You can fasten it anyway possible just as long as the tube is inserted into the large tube. The whole idea of returning the oil right back into the suction tube is to reduce cavitation. In other words, it makes it easier for the hydraulic pumps to draw oil from rear end. Those pumps will move more oil per minute than the total capacity of the reservoir thus adding to the problem of aeration of oil. If the suction tube is loose, well, then you have a split job to repair properly. They do break that bracket off and when that happens the o-ring between sections gets damaged.

Chshaffer · Sep 1, 2012

Pete 23 you are correct in that the large tube (suction tube) is still firmly fastened. Could not shake it. Apparently what ever holds it in place is further forward in the tractor as I could not see any bracket or holding device. The small steel tube had the end bent shut and several holes chewed in it from the gears in the tractor rearend. I am guessing the ring gear as it was the closest in proximity. Cleaned out the shaving and metal fragments as best we could. Will change the filter and add new oil when re-assembled. Thanks for the rational on the placement of the small tube. Certainly want to minimize cavitation.

Jim Naden · Sep 2, 2012

(quoted from post at 19:38:25 09/01/12) Pete 23 you are correct in that the large tube (suction tube) is still firmly fastened. Could not shake it. Apparently what ever holds it in place is further forward in the tractor as I could not see any bracket or holding device. The small steel tube had the end bent shut and several holes chewed in it from the gears in the tractor rearend. I am guessing the ring gear as it was the closest in proximity. Cleaned out the shaving and metal fragments as best we could. Will change the filter and add new oil when re-assembled. Thanks for the rational on the placement of the small tube. Certainly want to minimize cavitation.

Is the return tube still fastened in the suction tube?

I have brazed a strap to the tube to clamp it to the suction pipe for a quick, easy repair.

While you have the rear frame cover off, inspect the tubes that fasten on the under side for cracking etc.

Chshaffer · Sep 2, 2012

Jim. The return tube has broken loose from the suction tube. Metal fatigued or was torn right out of the end of the suction tube! The solder or weld that held the return tube to the suctin tube held but a section of the suction tube was torn out. The suction tube itself seems to be solidly in place yet. I have inspected the supply tubes on the bottom of the casting we removed and the brazed joints and tubes seem sound yet. Thanks to all who have responded.

656 hydro cont'd

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Jim Naden

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