Project 1872.. the not working hydro adventure continues.
Posted: Sun Jan 22, 2017 1:40 pm
Hi everyone, looking for some technical help here on project 1872 a.k.a. The Scrapyard special, or Back from the dead.
Background: a friend found this tractor in a scrapyard last month, we bought it at the right price, came with a 60" deck, but she had lived a hard life. Rear end housing was cracked, improvised bracketing/reinforcement held the rear end to the frame. Bent drive shaft, a KT17/II in place of the M18, bent steering ram and destroyed steering hoses.
So far.. Replaced the KT17 with a low hour M18. Rebuilt the rear end around a cast housing from a 1250 using the SGT pump and all of the 1872 internals, fresh fluid and gaskets. Replaced the drieshaft and steering ram/hoses.
The problem we are having is that the tractor seems to have no pressure to run the steering and hydro lift. Todd M. has been a great deal of help in chasing the problem back this far. My first thought was that something was damaged in the steering box, but I don't think that is the problem now. Forward and backward movement is fine, works as it should, so the pump is pumping. And nothing is leaking or acting odd. Fluid level has been double checked.
No It's not filled with real Hytran, it's Hytran equivalent from Rural King until we iron out all the issues.
Decided the best way to illustrate the issue would be to use imagery supplied by IH and C.C.C. for the express use of repairing the machine in question.
A picture from the 82 series service manual describing the major components.
Pressure gauge arrived yesterday, we connected it as per the manual. At full throttle the gauge only shows about 200 - 250 psi, at either end of the travel of the lift cylinder there was no change in the observed pressure.
The next thing we did (Yesterday) was compare both Charge pump and Implement lift relief valves with the same parts pulled from a ported pump from a 1450, found that #19 in this image (Spring) was broken and #20 (Cone) was missing all together, replaced with the 1450 parts. Still no real change I had hoped we had found the problem but replacing the parts had to effect.
Then we tried various combinations of shims on either valve, again, absolutely no change. Both relief valve assemblies are in good condition, clean and free of rust and debris.
I am open to any ideas and suggestions. I know this tractor had be worked on by someone in it's past, but the hydro pump had an even coating of grunge on it, it did not look like it had been disassembled recently, but at some point someone must have pulled the charge pump relief valve. ?
Background: a friend found this tractor in a scrapyard last month, we bought it at the right price, came with a 60" deck, but she had lived a hard life. Rear end housing was cracked, improvised bracketing/reinforcement held the rear end to the frame. Bent drive shaft, a KT17/II in place of the M18, bent steering ram and destroyed steering hoses.
So far.. Replaced the KT17 with a low hour M18. Rebuilt the rear end around a cast housing from a 1250 using the SGT pump and all of the 1872 internals, fresh fluid and gaskets. Replaced the drieshaft and steering ram/hoses.
The problem we are having is that the tractor seems to have no pressure to run the steering and hydro lift. Todd M. has been a great deal of help in chasing the problem back this far. My first thought was that something was damaged in the steering box, but I don't think that is the problem now. Forward and backward movement is fine, works as it should, so the pump is pumping. And nothing is leaking or acting odd. Fluid level has been double checked.
No It's not filled with real Hytran, it's Hytran equivalent from Rural King until we iron out all the issues.
Decided the best way to illustrate the issue would be to use imagery supplied by IH and C.C.C. for the express use of repairing the machine in question.
A picture from the 82 series service manual describing the major components.
Pressure gauge arrived yesterday, we connected it as per the manual. At full throttle the gauge only shows about 200 - 250 psi, at either end of the travel of the lift cylinder there was no change in the observed pressure.
The next thing we did (Yesterday) was compare both Charge pump and Implement lift relief valves with the same parts pulled from a ported pump from a 1450, found that #19 in this image (Spring) was broken and #20 (Cone) was missing all together, replaced with the 1450 parts. Still no real change I had hoped we had found the problem but replacing the parts had to effect.
Then we tried various combinations of shims on either valve, again, absolutely no change. Both relief valve assemblies are in good condition, clean and free of rust and debris.
I am open to any ideas and suggestions. I know this tractor had be worked on by someone in it's past, but the hydro pump had an even coating of grunge on it, it did not look like it had been disassembled recently, but at some point someone must have pulled the charge pump relief valve. ?
