53 Jubilee with piston pump conversion completed many years and hours ago. This is my main utility tractor, typically used for mowing, hay, plowing, row cultivating, and pulling my big tractor out of the mud :lol:. I know we all love pictures, so here is this last weekend as I was loading it up with the 6' Ford 907 flail mower to do some trimming in the pasture. https://drive.google.com/file/d/173CNXyYx_lWoVo_QThdjZL4wxaS4BPRK/view?usp=sharing
Moving on to what is important....the hydraulics have been weak on this tractor ever since it was passed down to me. It started off as needing to prime the pump before using it every time, but would work after it was primed. I rebuilt the pump, found the front seal/shaft grooved and replaced both. The gear housing was cracked, replaced, and replaced both bearings.This did [i:87b6651523]not[/i:87b6651523] fix the problem and I still had to prime the pump every day. Within just a few hours after rebuilding the pump, the hydraulics died completely, no response from the 3pt.
I pulled the hydraulics cover and found the piston seal in the bottom of the case. I changed the cam pin which was grooved, replaced the piston with the new design and installed a new o-ring and leather backup washer. I adjusted the 3pt per the PDF that is floating around. I was not able to get both position and draft properly adjusted, so I split the error between them (I do use draft when plowing and cultivating). Both settings have a gap that is too large by approximately .015". I replaced the felt seal, draft control spring plate, and adjusted draft spring tension. Upon reinstalling the cover, the 3pt works again. Lifting counterweight for the loader tractor, around 800lbs, it held it in the air overnight only dropping about 6", and this is heavy enough to pull the front wheels on the jubilee without any front weight. I believe everything under the cover is good.
However, the pump will not hold a prime. Shutting the tractor off for 20 minutes, I have to reprime the pump. It will pick up anything, but the lift is very, very slow and jerky. Lifting the flail, which is fairly heavy for the jubilee, can take 30 seconds. The lift is slow and jerky without a load as well. This appears to be a flow problem as I have pressure (can lift anything). I have not put a pressure gauge on it.
I was thinking only half or so of the pump pistons were actually pumping, low flow and not smooth flow. Thinking I messed up the pump rebuild, I took it back apart. The front seal looks perfect, as does the wobbler shaft. I am not sure where the pump is sucking air from. However, I found damage to the ball seats on the pump head. This is the only thing I found wrong: https://drive.google.com/file/d/16uG5tkMCBvWm62fRnKi449izYTcxwbP8/view?usp=sharing. The seats are deformed enough to partially block the holes.
Here is a gallery of all the pump parts:
https://drive.google.com/drive/folders/1of03SwwaSnIY05-ybEqHTpKI1RNFGb45?usp=sharing
Can anyone identify where my problem lies? What is my best course of action here? The tractor has exactly 10 hours on it since I rebuilt the pump initially. I cleaned the pump body and head before these pictures, but did not clean or disassemble the gear housing as it is all new and still appears to be in perfect shape.
I run Travellers UTF in all 3 holes from TSC. It is "recommended" for 134D.
Thanks in advance for advice, this is becoming expensive and incredibly frustrating.
This post was edited by Brad4321 on 07/27/2021 at 08:05 am.
Moving on to what is important....the hydraulics have been weak on this tractor ever since it was passed down to me. It started off as needing to prime the pump before using it every time, but would work after it was primed. I rebuilt the pump, found the front seal/shaft grooved and replaced both. The gear housing was cracked, replaced, and replaced both bearings.This did [i:87b6651523]not[/i:87b6651523] fix the problem and I still had to prime the pump every day. Within just a few hours after rebuilding the pump, the hydraulics died completely, no response from the 3pt.
I pulled the hydraulics cover and found the piston seal in the bottom of the case. I changed the cam pin which was grooved, replaced the piston with the new design and installed a new o-ring and leather backup washer. I adjusted the 3pt per the PDF that is floating around. I was not able to get both position and draft properly adjusted, so I split the error between them (I do use draft when plowing and cultivating). Both settings have a gap that is too large by approximately .015". I replaced the felt seal, draft control spring plate, and adjusted draft spring tension. Upon reinstalling the cover, the 3pt works again. Lifting counterweight for the loader tractor, around 800lbs, it held it in the air overnight only dropping about 6", and this is heavy enough to pull the front wheels on the jubilee without any front weight. I believe everything under the cover is good.
However, the pump will not hold a prime. Shutting the tractor off for 20 minutes, I have to reprime the pump. It will pick up anything, but the lift is very, very slow and jerky. Lifting the flail, which is fairly heavy for the jubilee, can take 30 seconds. The lift is slow and jerky without a load as well. This appears to be a flow problem as I have pressure (can lift anything). I have not put a pressure gauge on it.
I was thinking only half or so of the pump pistons were actually pumping, low flow and not smooth flow. Thinking I messed up the pump rebuild, I took it back apart. The front seal looks perfect, as does the wobbler shaft. I am not sure where the pump is sucking air from. However, I found damage to the ball seats on the pump head. This is the only thing I found wrong: https://drive.google.com/file/d/16uG5tkMCBvWm62fRnKi449izYTcxwbP8/view?usp=sharing. The seats are deformed enough to partially block the holes.
Here is a gallery of all the pump parts:
https://drive.google.com/drive/folders/1of03SwwaSnIY05-ybEqHTpKI1RNFGb45?usp=sharing
Can anyone identify where my problem lies? What is my best course of action here? The tractor has exactly 10 hours on it since I rebuilt the pump initially. I cleaned the pump body and head before these pictures, but did not clean or disassemble the gear housing as it is all new and still appears to be in perfect shape.
I run Travellers UTF in all 3 holes from TSC. It is "recommended" for 134D.
Thanks in advance for advice, this is becoming expensive and incredibly frustrating.
This post was edited by Brad4321 on 07/27/2021 at 08:05 am.