McGatha185
New User
Hello there. Here's what's going on. My Allis Chalmers 185 has sat idle for the last two years while I've worked through college. When I tried to get it going again, I found that my priming pump was bad and had let all the fuel leak out, so the entire thing was dry. I fooled and played with it for a couple weeks and did every trick anyone would tell me to try and get it started, but I'm to the point now that I'm doing my first rebuild of a Stanadyne Roosa Master diesel fuel injection pump. Here's it's numbers: DBGFC-637-34FW; 1339760; and 4022395. I'm sure that sometime in the past a different D2800 engine was put into this tractor. Under the peeling Allis orange is yellow from their heavy equipment lines. This pump also has the electric shut-off instead of the manual, which I've been told was never available on the 185 tractor.
Anyways, I've gotten my Stanadyne rebuild kit, I've got the pump off the tractor, I soaked and cleaned the outside, and now I'm slowly...carefully... disassembling this dog. My daughter is taking pictures and filming with her fancy camera setup too, just in case I need to reference back. I'm trying to play it safe. Ok, I've disassembled the whole thing except that the hydraulic body will not slide out of the housing. The rebuild manual just says: "Grasp the hydraulic head assembly firmly in both hands and withdraw with a slight rotary motion." It ain't sliding though. Won't budge the tiniest bit, like it's one solid piece, which of course it's not. I'm afraid to get mean with this for fear of breaking something. Do you have any suggestions? I could touch it briefly with a torch to flex the metal. I'm kinda leery of this with the diesel it may still have in it. I could dunk it in water first though. Would tossing it in the freezer for a while then into a warm oven help. The hydraulic pump and the housing are two different metals so they should change sizes at different rates. Right now I'm going to shoot it down with PB Blaster and see if that helps. Please give me any advice you have for getting this apart and any problems I might encounter getting this back together. Also I know that putting this back on the tractor can be a problem with those umbrella seals on the drive shaft wanting to turn inside out. Any advice on that?? Thanks!!
Anyways, I've gotten my Stanadyne rebuild kit, I've got the pump off the tractor, I soaked and cleaned the outside, and now I'm slowly...carefully... disassembling this dog. My daughter is taking pictures and filming with her fancy camera setup too, just in case I need to reference back. I'm trying to play it safe. Ok, I've disassembled the whole thing except that the hydraulic body will not slide out of the housing. The rebuild manual just says: "Grasp the hydraulic head assembly firmly in both hands and withdraw with a slight rotary motion." It ain't sliding though. Won't budge the tiniest bit, like it's one solid piece, which of course it's not. I'm afraid to get mean with this for fear of breaking something. Do you have any suggestions? I could touch it briefly with a torch to flex the metal. I'm kinda leery of this with the diesel it may still have in it. I could dunk it in water first though. Would tossing it in the freezer for a while then into a warm oven help. The hydraulic pump and the housing are two different metals so they should change sizes at different rates. Right now I'm going to shoot it down with PB Blaster and see if that helps. Please give me any advice you have for getting this apart and any problems I might encounter getting this back together. Also I know that putting this back on the tractor can be a problem with those umbrella seals on the drive shaft wanting to turn inside out. Any advice on that?? Thanks!!