D15 series II hydraulic pump failure

I've got a 63 Allis D15 that the hydraulics have been weak on since I bought the tractor. It also pushes hydraulic oil from the hydraulic sump into the power director housing. I decided to drop the pump this winter to see what was going on. It would appear the pump had been run low causing damage to the cam lobes on the input shaft and causing total failure of one of the roller followers. The inside of the sump was full of steel shavings. I've got the pump mostly disassembled. The plungers and most of the internals don't look to be in bad shape. I'm looking for input on whether or not I should buy a used pump or if I'll be fine cleaning up the one I have. The tractor still had lifting power, it was just slow and would not lift all the way up in one go. I'm leaning towards replacing the input shaft with a good used unit as I have to tear the torque housing down to replace the seal between the hydraulic sump and power director anyhow. While the tractor is apart I plan on going through everything from the flywheel back. Power director seems to work fine, stays in as long as the oil level doesn't get too high. Tractor doesn't jump out of any gears. I was planning on replacing the hose and cylinder seal on the real lift cylinder while I'm in there. The tractor has a loud and I mean loud howl in 4th gear. Sounds like the final drives. I've heard that this is just how these tractors are but I've never been on another d series. Going to go through all the bearings in the trans and finals. Any thing else I should check out while I have it apart? Sorry for such a long post.

I plan on checking the brakes when I go through the final drives. Good to know the howl isn't anything to be too concerned about. I'll post some pictures as soon as I figure out how.

Also a good time to replace the shaft (70228627) and bushing ( takes 2 70233270) that the clutch pedal rides on if there is a lot of play also the o-ring (70232984) for the pto shifter and both o-rings on the power director shift (takes 2 70232985). If you do the brakes and your tractor serial no. is 9001 & up, watch the washer spring they're 6 of them they're NLA. Also welcome to the forum. What part of Iowa your from?  I use Bill Deppe for most of my use parts and after market parts he's located in Maquoketa, Ia 563-652-2949 shop 563-357-2615 cell and Helle Equipment in Dyersville Ia 563-875-7154. for new parts, or Gerry VandeVorde 319-350-6710 after market parts. HTH


Edited by Kenny L. - Yesterday at 6:58am

If it was mine, and I didn't need to use the lift arms for heavy lifting or a mounted plow requiring the Traction Booster system, I'd probably source a salvage yard hydraulic stack from a D-17 IV, 170 thru 185 and fabricate an under hood belt driven 5 to 6 GPM hydraulic pump. Or go with the hyd loader style crankshaft driven pump and just go without the high pressure system and changing out a clutch shaft, which is a big job. CoggonObrien has a post on this D-15 II live system from about 5 yrs ago. It may have been titled "D-015 series 3 hydraulics" or something like that.

Edited by DrAllis - Yesterday at 8:12am

Kenny L. wrote: Also a good time to replace the shaft (70228627) and bushing ( takes 2 70233270) that the clutch pedal rides on if there is a lot of play also the o-ring (70232984) for the pto shifter and both o-rings on the power director shift (takes 2 70232985). If you do the brakes and your tractor serial no. is 9001 & up, watch the washer spring they're 6 of them they're NLA. Also welcome to the forum. What part of Iowa your from?  I use Bill Deppe for most of my use parts and after market parts he's located in Maquoketa, Ia 563-652-2949 shop 563-357-2615 cell and Helle Equipment in Dyersville Ia 563-875-7154. for new parts, or Gerry VandeVorde 319-350-6710 after market parts. HTH

The pedals are actually pretty tight on this tractor. I'll definitely be replacing any seals/orings/gaskets I come across. I'm in north central iowa. Thanks for the good leads on parts sources.

DrAllis wrote: If it was mine, and I didn't need to use the lift arms for heavy lifting or a mounted plow requiring the Traction Booster system, I'd probably source a salvage yard hydraulic stack from a D-17 IV, 170 thru 185 and fabricate an under hood belt driven 5 to 6 GPM hydraulic pump. Or go with the hyd loader style crankshaft driven pump and just go without the high pressure system and changing out a clutch shaft, which is a big job. CoggonObrien has a post on this D-15 II live system from about 5 yrs ago. It may have been titled "D-015 series 3 hydraulics" or something like that.

I've seen that thread on adding live hydraulics and a d17 IV valve stack to a d15. I'd like to do that eventually to run along side the allis pump. I've got a snap coupler plow I pull at shows from time to time and I would like to keep the traction booster intact.

Dad was the local mechanic. Worked on anything that had an engine. Told me a lot of the old retired Allis's ruined hydraulic pumps and cams because nobody checked the oil anymore. Just as Doc stated.