So I had trouble with the large delco starter on my Case 830 deisel. It turned over slow to a point I thought maybe I needed new batteries or cables. Batteries checked good and I build new 2/0 cables. Worked a little better but still would not start without intake heater and lots of cranking. Then I remembered something Mel told me about my generator light coming on. I tried everything to fix it and finally he told me on this website to spray a little wd-40 in the back of the generator on the spring loaded brush holders as the they could be rusted and not moving. I did it and it fixed the light and it charges well.
I thought maybe the same thing has happened in my starter? I went ahead and pulled it off, man is it heavy. I pulled the back bearing plate and looked at the four brush holders, they were rusty and would not move well enough to make solid contact with the armature. I used carb cleaner and sprayed out the inside and blew it dry then I used wd-40 and lubed the hinge points on the brush holders. I kept lubing and moving them back and forth till they moved free and made solid independent contact with the armature. I then cleaned the armature where the brushes made contact. After that I removed the front and rear oil plugs and filled the wick with oil that lubes the front and rear bushings. To finish the job I removed the solenoid and put it on the bench. I removed the screws on the back plastic cover, removed the nuts and tipped the cover on the back of the solenoid down. You cannot pull it all the way off as there are soldered wires on the activation post. Removed the copper disk and plunger, buffed it with the bench grinder wire wheel. Then remove the large copper bolt. It has a lock not on the back of the solenoid plastic cover and rotate it 180 degrees and tighten it down. At this point you have pretty much clean and positive contacts for the solenoid.
I checked the bendix drive and made sure the fork was moving freely that the drive pivots in and out into the flywheel. Put It back on the tractor hooked it up and it turns over at a high rate of speed! It was cold when I cranked it over and it didn't even need to be preheated and it started right up. The key to a diesel engine starting well is fuel, engine rotational speed, compression and air. Take any of the four away and it will either start hard or not at all. Using what Mel told me and applying it to a starter saved me about $350.00 not to mention lots of headaches. Again Mel, Thank you!! Nick
I thought maybe the same thing has happened in my starter? I went ahead and pulled it off, man is it heavy. I pulled the back bearing plate and looked at the four brush holders, they were rusty and would not move well enough to make solid contact with the armature. I used carb cleaner and sprayed out the inside and blew it dry then I used wd-40 and lubed the hinge points on the brush holders. I kept lubing and moving them back and forth till they moved free and made solid independent contact with the armature. I then cleaned the armature where the brushes made contact. After that I removed the front and rear oil plugs and filled the wick with oil that lubes the front and rear bushings. To finish the job I removed the solenoid and put it on the bench. I removed the screws on the back plastic cover, removed the nuts and tipped the cover on the back of the solenoid down. You cannot pull it all the way off as there are soldered wires on the activation post. Removed the copper disk and plunger, buffed it with the bench grinder wire wheel. Then remove the large copper bolt. It has a lock not on the back of the solenoid plastic cover and rotate it 180 degrees and tighten it down. At this point you have pretty much clean and positive contacts for the solenoid.
I checked the bendix drive and made sure the fork was moving freely that the drive pivots in and out into the flywheel. Put It back on the tractor hooked it up and it turns over at a high rate of speed! It was cold when I cranked it over and it didn't even need to be preheated and it started right up. The key to a diesel engine starting well is fuel, engine rotational speed, compression and air. Take any of the four away and it will either start hard or not at all. Using what Mel told me and applying it to a starter saved me about $350.00 not to mention lots of headaches. Again Mel, Thank you!! Nick
