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Farmall 460 hydraulic pick up

D

Dcjr

New User
I have a Farmall 460 that I'm having some trouble with. When I fill the rear end with hi Tran to the check plug the oil still seems low. When I pull the filter housing off his only about half full. I see the hole in the casting that goes back to the rear end where the filter would get its oil from. When the rear end is filled with 10 gallons as calls for, the oil is not even running into the filter housing. This is giving me cavitation in the pump. Added three more gallons and it's barely trickling in ,so the pump is still cavitating. My question is doesn't the pickup tube hole for the pump behind the filter have to be completely underoil??
 
Pickup tube is either cracked,or separated.Easy 'fix' is to add 3 extra gallons of oil.Get the oil level up above the filter. If that doesn't work,time to tear it apart.
 
(quoted from post at 08:00:33 02/14/20) Pickup tube is either cracked,or separated.Easy 'fix' is to add 3 extra gallons of oil.Get the oil level up above the filter. If that doesn't work,time to tear it apart.
Click to expand...
So I'm not losing my mind the pickup tube should be totally submerged correct? Thanks for the response
 
No the tube is not supposed to be full. When you remove filter
only the filter should drain like a couple quarts. You are
sucking air.

Three common spots are, around filter cover gasket. Main suction
tube going into rear(at o ring in split or broken loose tube
bracket) or the suction tube at the pump.

460 holds right at 8 gals.
 
(quoted from post at 08:30:06 02/14/20) No the tube is not supposed to be full. When you remove filter
only the filter should drain like a couple quarts. You are
sucking air.

Three common spots are, around filter cover gasket. Main suction
tube going into rear(at o ring in split or broken loose tube
bracket) or the suction tube at the pump.

460 holds right at 8 gals.
Click to expand...
is there supposed to be a tube on the filter side when you take the 6- bolt oval-shaped side off that goes into the rear housing? I just acquired this tractor and I'm trying to figure out the hydraulics.when I first opened that plate to check the filter there was no filter in it the only tube I have is the short jumper tube that goes from the pump into the cast housing, how is the oil supposed to get from the rear end to the pump housing? Am I missing a tube? Thanks again
 
Yes,there is a pickup tube. You cant see it as it is inside. You can see the suction hole from the filter cavity.Overfilling the rearend simply submerges the suction tube. Any cracks are now under oil,so instead of sucking air,it sucks oil.However,be aware,overfilling can sometimes cause premature axle seal failure.Happens,but not often.Overfilling is a common 'fix' on 06/56/66 series tractors.
 
(quoted from post at 09:03:37 02/14/20) Yes,there is a pickup tube. You cant see it as it is inside. You can see the suction hole from the filter cavity.Overfilling the rearend simply submerges the suction tube. Any cracks are now under oil,so instead of sucking air,it sucks oil.However,be aware,overfilling can sometimes cause premature axle seal failure.Happens,but not often.Overfilling is a common 'fix' on 06/56/66 series tractors.
Click to expand...
Excellent information thank you very much!
 
Did you have the pump out? If so, that seal on that tube is very touchy and has to seal nice and
snug in the groove in the housing. The seal is movable on the tube so when installing a new tube
or pump, one has to position the seal on the tube . Also, it is easily damaged when installing
pump.

The tube is somewhat visable from the filter side through passage to other side but there is no
tube on filter side. Tube in rear frame is sealed with an o-ring between the two main housings. In
the split. Tube is also bolted down and often times breaks loose. But, just a poor gasket seal on
filter will suck a lot of air also and often overlooked.

Over filling a 460 does very little as it is really tough to cover those suction points. Not like
the large frame tractors. Even on them, the main advantage is higher oil level makes the front
pump on them not have to draw the oil up such a big hill so to speak so they prime up easier.
 
(quoted from post at 12:16:52 02/14/20) Did you have the pump out? If so, that seal on that tube is very touchy and has to seal nice and
snug in the groove in the housing. The seal is movable on the tube so when installing a new tube
or pump, one has to position the seal on the tube . Also, it is easily damaged when installing
pump.

The tube is somewhat visable from the filter side through passage to other side but there is no
tube on filter side. Tube in rear frame is sealed with an o-ring between the two main housings. In
the split. Tube is also bolted down and often times breaks loose. But, just a poor gasket seal on
filter will suck a lot of air also and often overlooked.

Over filling a 460 does very little as it is really tough to cover those suction points. Not like
the large frame tractors. Even on them, the main advantage is higher oil level makes the front
pump on them not have to draw the oil up such a big hill so to speak so they prime up easier.
Click to expand...
Yes I have had to pump out twice and check the o-ring everything seems fine I should have the new one today just for the hell of it to replace it and see what happens
 
Have you taken the pto out?
On my 460, iirc, there is a tube from the filter housing part of the casting that goes downward toward the middle of the rear
case.
 
You said that you have had the pump out twice and the O-ring looks fine... What about the leather seal that is on the short jumper tube? That seal has to be good or it will suck air out of the TA housing. The part number has changed a few times. The latest number is 395334R91 according to my notes in my 460 parts book. This seal has to be good. Don't ask how I know. BTDT
 
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