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Recent content by Old Magnet

Yesterday's Tractor Forums
  1. O

    Caterpillar Grader 112

    3U5382 is a 1955 #112 unit, uses D315 engine.
  2. O

    Caterpillar d6 9u value

    Couple of plus features....Appears to be an oil clutch version and segmented sprockets, probably the 6.91" pitch track upgrade. Might make the $5K mark if it runs well even though the undercarriage is well worn. Not late enough to have the flywheel housing drilled for direct electric start. So...
  3. O

    D2 serial No

    Good guess, that is a 1938 model.
  4. O

    1945-50 D6 dozer

    Remove the plug with the square recess that is behind the engagement linkage. It will give you access to bump/release the engagement levers. Bumping one lever is all that is required as they are linked together.
  5. O

    1980 D3 Caterpillar not steering

    Early D3's just had a straight spool (no bearing) Later versions D3B uses the bearings. Would help if you posted s/n. The steering clutch control valves are a balance type valve, depending on correct position to control pressure. Internal leakage would bleed off internally through the return to...
  6. O

    Cat D6C Engine Identification

    If it is direct electric start you will want a head with pre-combustion chambers for glow plugs
  7. O

    1980 D3 Caterpillar not steering

    Check the small bearings on the end of the steering clutch control valve spools. These little bearings are known to fail and when they do they allow pressure loss to the steering clutches due to inaccurate spool control. There isn't much of an adjustment to the steering clutches. The only...
  8. O

    Cat D6C Engine Identification

    Cancel that,the interchange list is correct.
  9. O

    Cat D6C Engine Identification

    That's 8M0694, not 8M0690. Can't find the edit function on this forum???
  10. O

    Cat D6C Engine Identification

    No difference. Here's the interchange numbers: Casting Numbers...1M0030,2M5417,2S9790,5S1880,5S4100,8M0690 Part Numbers...0R1425,0R2124,0R2581,1S1600,4M6822,5S1260,5S1860,5S1884, 8M0694,9L1899
  11. O

    Cat D6C Engine Identification

    1P4303 is for the D333c
  12. O

    Cat D6C Engine Identification

    1P4303 part number does not show on my interchange list.
  13. O

    Cat D6C Engine Identification

    Correct cylinder head part number is a 5S1884 with a casting number 2S2970
  14. O

    Cat D6C Engine Identification

    You've probably figured it out by now but that is a D6C with D333aT engine (4-1/2 bore. D333c's came later (4-3/4 bore). D333a's have belt driven water pump, D333c's have gear drive water pump. Be sensitive about water temp as they were somewhat prone to cracking heads.
  15. O

    D4 Magneto

    Try here: www.mainlymagnetos.com
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