I think there''s a tractor split in my future?

Lynn Patrick

Well-known Member
I have this '55 860 back together & it's running great but no hydraulics. The I&T says pump some air into the dip stick tube to prime the pump but that didn't help. On a hunch I loosened the filler cap on the tranny & it popped off from interior pressure. I suspect that means the hydraulic tube in there is leaking? Is there a tutorial on repairing that problem? Any advice? Any help is much appreciated!
Thanks!
 
(quoted from post at 17:56:14 12/19/20) I have this '55 860 back together & it's running great but no hydraulics. The I&T says pump some air into the dip stick tube to prime the pump but that didn't help. On a hunch I loosened the filler cap on the tranny & it popped off from interior pressure. I suspect that means the hydraulic tube in there is leaking? Is there a tutorial on repairing that problem? Any advice? Any help is much appreciated!
Thanks!
f pressure tube has a hole in it, inside the transmission, the transmission oil level should rise/overflow. That is how you know if you have a problem at that point.
 
Crack the hex plug on the top of the hydraulic pump itself to see if you can get some fluid to seep out of it. Don't remove the plug entirely with the tractor running, that will result in a geyser if the pump gets primed.
 
(quoted from post at 02:27:02 12/20/20) Crack the hex plug on the top of the hydraulic pump itself to see if you can get some fluid to seep out of it. Don't remove the plug entirely with the tractor running, that will result in a geyser if the pump gets primed.

It's the other pump. I removed the plug on the side of the center housing like the book says.
 
There are two ways to prime the pump. One is blow air into the dipstick tube as yo have tried. The other is crack the hex plug at the top front of the hydraulic pump. Two completely different methods. With the tractor not running, remove the hex plug at the hydraulic pump and pour some hydraulic oil right into the pump itself. Replace the hex plug, but leave it cracked. Fire up the tractor and see if the pump primes and you get some oil and air bubbles seeping out. Tighten the plug when no more air bubbles are visible. You could even put a fitting in place of the hex plug to attach a tube to dump back into the hyd sump to avoid a mess.
cvphoto67887.jpg
 
(quoted from post at 13:59:39 12/20/20) There are two ways to prime the pump. One is blow air into the dipstick tube as yo have tried. The other is crack the hex plug at the top front of the hydraulic pump. Two completely different methods. With the tractor not running, remove the hex plug at the hydraulic pump and pour some hydraulic oil right into the pump itself. Replace the hex plug, but leave it cracked. Fire up the tractor and see if the pump primes and you get some oil and air bubbles seeping out. Tighten the plug when no more air bubbles are visible. You could even put a fitting in place of the hex plug to attach a tube to dump back into the hyd sump to avoid a mess.
<img src="https://www.yesterdaystractors.com/cvphotos/cvphoto67887.jpg">
e said, "It's the other pump". A vane, not piston.....no plug on top of pump.
 
As JMOR said, it's the other pump. I have the plug that's by your right heel out & a line attached. When I pump air in the dipstick hole I get erratic oil spurts in that line & air pressure in the tranny.
What's the procedure for repairing the line thru the tranny? Do I remove the whole center section so I can get at both ends? I was hoping there was a tutorial!
Again - thanks for any help!!
 
To replace hyd pressure tube without a
split, remove manifold from pump to front
of trans. Tap 7/16 thread in pressure tube.
Insert threaded rod, put a tube over
thread, then a washer, then a nut. Tighten
nut to pull tube out. I am not sure if YT
has the replacement tube here. Walts tract
or parts does list it.
 
I wander if you don't have something wrong in the pump? The intake tube seldom develop leaks. If it did it would lower the oil level in the transmission,
probably not sucking air! Hydraulic pressure usually develops a leak in the pressure line. Maybe I haven't followed this story close enough, but loosen
the hydraulic bolts (5 of them) and see if you can's get some oil out of the intake line, with air pressure, at the manifold. then see if the pump will
work.
 
Air pressure through the dip skick hole..oil ot the loose manifold. I think my earlier post is confusing
 
(quoted from post at 20:24:55 12/20/20) Can.t spell either?? "stick"
Tomorrow (it's Sunday!) I plan to check the oil level in the tranny. I had very recently filled it to the proper level, so it should be obvious. If it's high I will probably pull the top cover to see if I can see a leak when under pressure???
 

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