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  1. Old Growth

    Cat overcharging

    Dozer overcharging. We have a 1972 D4D Cat that is a Mitsubishi/Japan made tractor. It has Mitsubishi electrical/alt/gen on it. While running it today the ampmeter was higher than usually and once I shut her down, I noticed the finals on both sides were wet. After better inspection, I...
  2. Old Growth

    D6 pony motor bearings/crank

    Crank shaft bearing sizes for D6 pony motor. It’s an opposed cylinder twin. I’m looking for journal sizes. Also looking for recommendations for a source for replacement bearings and piston rings. The crank has spun one rod bearing. The good journal measures out at 1.875” and the spun...
  3. Old Growth

    Repower a Skidder

    Anyone ever repower a log skidder originally equipped with a Detroit 353 to another kind of diesel?? I have an old Garrett 21 with a bad 353 and Im not to keen on listening to that old screamer. I have a Deutz 4 cylinder diesel Im thinking about putting in it. Im not sure if this is a good...
  4. Old Growth

    Stuck clutch

    I have a 78 Kenworth with a CAT and a 13 speed. I parked it for about 4 months. I fire up every month or so. Ive left it sit for long periods before with no problems, but not this time. The clutch disc is frozen and it wont go into gear. I cant easily start it in gear since its parked in a...
  5. Old Growth

    Bad decisions Komatsu.

    So I bought an "estate" dozer. A mystery machine with a "known" bad starter. But I was assured it ran and moved by the seller. Its a Komatsu D31A-17 With ROPS and a 6 way blade. It has pretty new chains/rails and sprockets. It does indeed run and it does indeed move. I spent a day...
  6. Old Growth

    Cat hour meter leaking

    On my D4D the hour meter is on the fuel pump and it leaks/drips diesel. The sight glass is very discolored and it appears to be filling up the meter and then leaking out from under the edge of the clear sight glass. I can’t find any info about this anywhere on the net. Any input?
  7. Old Growth

    Cat Balls

    Does anyone know where to get the rubber balls that go into the extra mounting holes in a Caterpillar wet starter nosecone to keep clutch oil from leaking? I cant find a mention of them in any of my CAT parts books or any part numbers on the web either. The nose cone has a couple extra holes...
  8. Old Growth

    Direct drive D4 clutch lever removal

    I’m trying to replace the bearings in the pivot on the clutch lever on my 72 d4d cat. The lever is held onto a steel post on the left side of the tranny by a washer and a cotter pin. The problem is that you can’t slide it over far enough to remove it before it hits the dozers frame/body...
  9. Old Growth

    D4D info?

    Hello fellas. I recently added a D4D to the fleet and am looking for a little info. The old owner still has to locate the larger service and Op manual for me. I have a parts manual for now. Its a direct drive model. Its a 6J51234 serial number. Its hard to find any single source that...
  10. Old Growth

    EX40UR Random INFO?

    Hello, Ive lurked here for many years and now have a reason to contribute. I purchased a Hitachi EX40UR grey market mini excavator with a bad engine and am in the process of fixing it. I bought a NEW isuzu engine and have got it about half way installed. As soon as its ready to run, I would...
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