Hello Kbeamish. I have the same dozer as you :drinkup. D21A-5 with a canopy, 6 way blade, 1740 hours.It runs and operates just fine. I'm having a small situation with the track adjusters. They now take grease, bur I can't back them off to release the pressure to adjust the tracks. I afraid that to much force on the greaser bolt will snap it off. So I drilled a small hole 1/8 diameter in front of it I can now grease it up and release the pressure. Now I have to weld the hole shut. I'm thinking of using JB Weld and just not greasing it too much. Do you have all the manuals?
Hello Darinray, No, I don't have the hold down bracket. Just a 1" piece of angle iron that comes factory made to protect the grease valve. I drilled into the cylinder body about 2" forward of the grease valve. A 1/8" hole and I only drilled into the cylinder body about 3/16", maybe less, then the grease oozed out because of the spring pressure. Before I weld it or JB Weld it, I tried to plug the hole with a "V" tapered rubber plug and a hose clamp. But grease oozed out around the plug. So, I was thinking about the JB Weld. At last resort, I'll mig weld it closed. I'd rather get the valve out, but I'm too chicken to put a lot of strain on the valve nut.
Hello Mikek, I'd rather tap the hole but because of the rust and the inside moving piston, there might be 1/16 to 1/8 of metal left. Do you think a bottoming out tap would work?
Sounds like you hvae a real nice machine with trouble free work. From the way you have described it I woudl say you have used up all of the brake band OR the big nut won't go farther on the thread because it is rusted up or damaged threads on the bolt. ???? Hard to say unless you open it up really. Whenever I change the steering clutches and or brake bands on these units I normally have to clean the threads off to make it adjust easier.