Can you help me solve this hydraulic mystery on my 1650?

E.Miller

New User
I have a 1967 model 1650 gas with a hydraulic mystery.My father purchased the tractor new. My son and I removed the system from the tractor when the Hyd oil was gradually leaking from the system into the rear end 2 years ago. St Joseph equipment tested the pan that separates the transmission from the Hyd system using a solution of soapy water and compressed air and determined that there is no crack in the pan. This was after I first cleaned and inspected the pan myself. The Hyd pump was working fine,but it was original. The seal on the pump imput driveshaft was aged and their was enough wear on the shaft that the dealer replaced the pump.
I had a cracked rib at the time and was having trouble moving about.
We put the hydraulic system in the bed of my pickup on blocks using the dealers cherry picker for the return trip home. The mechanic failed to tell me that he had not removed a hidden plastic plug from the oil intake port of the new pump. And as a result of my physical limitations I climbed in and stayed in the skid loader while my son chained the unit and then I placed the unit over the tractor while he guided it onto the alignment pins. After the system failed to prime we called the dealership several times and eventually talked to the mechanic himself. Imagine my level of disappointment when we figured out what had been overlooked. We lifted the hydraulic system from the rear end and pulled the plug and completed the reassembly the second time that day and we immediately had power steering.The tractor sat in the shop for a week afterward and never moved. I pulled the hydraulic dipstick before I ever started the tractor and the oil level had gone down while it sat in the shop over the 7 days.We used the tractor through corn harvest on our 10"x60' auger anyway.
The whole tractor was hauled to the dealer after harvest and they stood behind it. They put in another new pump but the oil is still gradually going into the rear end. The dealer has not offered any further help or troubleshooting.The Service manager is a good kid, but he is employed by a Large chain store.
This tractor is limited to stationary PTO work. One question I have is related to the 10"x60' auger. The lift cylinder on the auger is single acting. Our tractor has only been operated as double acting. We hook the single coupler to the base port and that has always raised and allowed the auger to lower. The single Hyd hose has a ball valve on it that we always close and the upper end of the auger sets in a saddle that I built and bolted to the roof of my wet corn holding bin. The tractors Hyd system has NEVER had to support the weight of the entire load. Anyone have any insight to what's happening and how the oil gets from the Hyd system into the rear end?
The tractor has the original hour meter and it's has over 10,100 showing.If I was tech savvy I'd post a picture of it. Anyone who is an Oliver fan would be proud to own it.It has been repainted at a body shop.I use it's picture as the wallpaper on my cellphone.I was 7 years old when this tractor was delivered to our farm and it is the source of many wonderful memories. Any help would be appreciated.Thanks for your time and reading my long post. Ed.
 
I could be way off here, but I think there
might be a pipe elbow that is attached to
pump plumbing somehow that is known to
crack. If so could that be leaking hydraulic
oil into the rear end? I've never had the
hydraulic unit off mine so I'm not sure.
Just thought I read about that fitting on
here before.
 
I've been through the hydraulic system on my 1550. The elbow kevinecwi mentioned is above the pan so not likely. If the pan doesn't leak I think the only other place could be where the pump shaft inserts into the drive gear. The drive gear and its bearings are over the opening of the transmission case.
 
Have you verified the rearend
level is rising? Could it be
leaking from hydraulic hoses or
remotes? I worked on neighbors
1650 once and same symptoms but
hydraulic loader cylinders were
leaking.
 
Thanks everyone. We have added pipe fittings and a faucet to the upper level of the rear end. When we place a pail and open the faucet our green colored universal hydraulic oil is what drains into the pail.
As I wrote my original post I began to wonder if the pan might still be suspect. I assumed that the soapy water and compressed air that the dealership used was foolproof. That may have been a mistake.
I was under the impression that the new hydraulic pump and seal was the only other point where the oil could leak other than through the pan. We ran the tractor for somewhere between 15-30 minutes without oil in the new pump because the of the plug that was left in the intake port. The dealership claims that they put another new pump in the system when they came and took the entire tractor to the shop. I hope my trust in them is not misplaced. I appreciate all your comments. Keep them coming, Thanks, E.
 
Might be way off but here is what I remember from years ago. We had a White 2-150 with same symptoms. After several tear downs dealer
found a crack in what to me looked like a round casting with o-ring and seals on it. Don?t know even were it fit in the system. I was only a
teenager at the time. Had to magna flux it to find the crack. I have a 2-88 currently doing the same thing but only use it on a auger so haven?t
tore into it.
 
That is a mystery. The 1850 has an internal draft control rod that comes up through the pan with a seal around it that can leak,but it's external on the 1650. Somebody had the same problem a few years back and it was some pin holes in the pan. He coated it with something before he put it back together and that fixed it,but I don't remember what he coated it with. Anybody else remember that one?
 
the soapy water was supposed to bubble through any crack...nice idea if
you're checking a gas/propane line, but not here because the crack probably
comes and goes with the tractor temp...cold it could be closed, opens as it
warms. The increase in pressure push's it til it drops.

Having said that Larry has completely tore these things apart right down to
the last tiny piece...I'd do what he said and thanks for the tip.
 

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