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Section for komatsu d20,21 and similar grey market dozers

Discussion in 'Dozers' started by rangerfreak, Jun 4, 2007.

  1. DMiller

    DMiller Senior Member

    Joined:
    Feb 22, 2010
    Messages:
    11,892
    Occupation:
    Almost Retired
    Location:
    Hermann, Missouri
    Like learning washers, ALWAYS Face Up flat side down rails are Small or Narrow Link(Bushing) End Forward, Not so hard to remember.
     
  2. kealo

    kealo Member

    Joined:
    Jun 1, 2019
    Messages:
    23
    Location:
    canada
    Hey guys
    Been looking for a small dozer for some projects around the property.
    Came across a
    Komatsu D31-16 Dozer.
    Can you guys tell me about this if it is worth taking a look at and what to look for?
    5000h on it $10k canadian.
     
  3. kealo

    kealo Member

    Joined:
    Jun 1, 2019
    Messages:
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    Location:
    canada
    Pick
     

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  4. DMiller

    DMiller Senior Member

    Joined:
    Feb 22, 2010
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    11,892
    Occupation:
    Almost Retired
    Location:
    Hermann, Missouri
    What will be the end purpose, personal, few hours per operating season, dependency for a paycheck, private business? I have a antique hard to find parts for machine, is simplistic and seem to find MOST components I Need to keep it moving. That stated I depend for nothing of the machine it is a hobby and past time use maybe a few tens to a hundred hours a year.
     
  5. kealo

    kealo Member

    Joined:
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    23
    Location:
    canada
    I will keep it a year or two to clean up 15acres from a tornado that went through. I am finishing clearing the trees and will dig a pond with my excavator. So will need the dozer for final grade and cleanup around trees. I have been looking for a while and not much around for under $20k. Just thought some feedback on this unit if there is anything i should look for if i go see it.
     
  6. DMiller

    DMiller Senior Member

    Joined:
    Feb 22, 2010
    Messages:
    11,892
    Occupation:
    Almost Retired
    Location:
    Hermann, Missouri
    Check for reasonably close proximity parts suppliers, also check on machine parts availability where some of these have gone to obsolescence levels. Komatsu is not known for parts readily available on a number of machines.

    No pieces or extreme time factor to get or only well worn used may wish to stop, bite the bullet and arrange for rental of Newer NOT YOURS machines on as needed only basis and not have the investment may not be able to recover machine. $6K on one two or even three occasions where you supply fuel and add oil and grease ONLY could be beneficial.
     
  7. kealo

    kealo Member

    Joined:
    Jun 1, 2019
    Messages:
    23
    Location:
    canada
    Ya renting is nice its just hard to get full benefit of the time.

    I just talked to the guy and it has a dif leak. Have to add 1/2l per day
    New chain and sprockets and every other pad. New water pump. Late 70s machine. There is a dealer close by.
     
    DMiller likes this.
  8. Oldyellar

    Oldyellar Member

    Joined:
    Feb 24, 2015
    Messages:
    11
    Location:
    Kentucky
    Hi all I have a question on a D20a-6 on cold start up no matter what temp is outside When I start the dozer normally takes 4-5 cranks when cranking it rolls gray/white smoke when it does hit it misses for a little bit then clears up once warm or after a few minutes running starts up fine with no issues. Was curious on thoughts of what’s causing this
     
  9. DMiller

    DMiller Senior Member

    Joined:
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    Occupation:
    Almost Retired
    Location:
    Hermann, Missouri
    Old age, losing a little Compression is likely.
     
  10. Oldyellar

    Oldyellar Member

    Joined:
    Feb 24, 2015
    Messages:
    11
    Location:
    Kentucky
    I’ve put engine restore in it and it has made a little difference hr meter I believe is original showing 2400 ive changed fuel filter also. thanks for the info
     
  11. mitch504

    mitch504 Senior Member

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    Location:
    Andrews SC
    Are you using the glow plugs? Does your glow plug indicator glow? If yes, check your plugs with an ohm meter.
     
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  12. Oldyellar

    Oldyellar Member

    Joined:
    Feb 24, 2015
    Messages:
    11
    Location:
    Kentucky
    Yes and no lol I use the glow plugs when real cold and I do have the element that glows but when it’s 92 degrees outside should I still be using the glow plugs
     
  13. mitch504

    mitch504 Senior Member

    Joined:
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    5,305
    Location:
    Andrews SC
    Yep, on the -6 models at least, use the glow plugs every start according to Kommie. It makes a difference even in summer in my experience.
     
  14. Oldyellar

    Oldyellar Member

    Joined:
    Feb 24, 2015
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    Location:
    Kentucky
    Thanks for the info will do
     
  15. GuglioLS

    GuglioLS Well-Known Member

    Joined:
    Apr 6, 2009
    Messages:
    59
    Occupation:
    Electronics Field Service
    Location:
    Edgewood, NM USA
    Always heat glow plugs prior to starting. 10 to 12 seconds seems to be the majic time at least on mine.
     
  16. JimInOz

    JimInOz Senior Member

    Joined:
    Apr 15, 2008
    Messages:
    477
    Location:
    Victoria, Australia
    I had the use of a D31S-16 Loader for a while.Firstly,I had to fix a busted pinion & bullgear. It became a great machine for property work,not too small at 7.5 tons. There are lots of aftermarket parts...check out steeringclutch.com & many others on Google Search.
    Like all 40 YO machines,you need to test the basics & look at the oils & filters to see if it's been serviced.
    There are lots of other machines that are harder to get spares for,so if it's tidy enough,it might be a good buy.
    Buy manuals for it...they pay for themselves every year.eBay or Tradebit might be a source.
    Good luck...
     
  17. Buchan

    Buchan New Member

    Joined:
    Dec 20, 2018
    Messages:
    2
    Location:
    Australia
    I have just taken delivery of a D21A-8 s/n 90038, apparently 2008 manufacture, 948hrs.
    It is fitted with detachable root rake and rippers. It has the steering leavers on the dash.
    However when checking part lists online, it appears that the -8 only came with the joy stick steering. I can't find the gated gear shift mechanism setup that mine has. The last machines that have the normal gated shift in the online parts lists are the -7s.
    So did the D21A-8 only come with joystick steering?
     

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  18. Pete1961

    Pete1961 Member

    Joined:
    Feb 5, 2017
    Messages:
    5
    Location:
    Shropshire U.K.
    Hi, Found this by accident, sorry if not new to you. I know many bemoan the complexity of modern machines, this is simple older Komatsu tech, is available as a direct drive or as a full hystat, Called a Beml BD 50 https://www.bemlindia.in/writereaddata/Downloads/20170905055550BD50.pdf
    It would be interesting to know the relative cost of the hystat vs DD - otherwise it is the same machine.
    They make others & other types of machine. I guess it would come down to their metallurgy - as to weather the machine was any good. Did not think it worthy of a thread of its own? but might be last builder of a direct drive dozer. I have seen many aftermarket Komatsu Indian made replacement parts - but seem to start at the D31 up.
    Also this site gives tips on operating & explains the best use of the slot dozing technique
    https://www.heavyequipmentrentals.com/about/news/operating-a-dozer-tips He says a full blade should be won in two tractor lengths, then drift the load in 2nd - rather than the peel & boil method of always having the blade cutting. I was told when young if the dirt is not peeling then the blade is loosing its load, maybe a little but the compensation of the 2nd gear push of a filled blade may well win out time & fuel wise. Have not touched a dozer in years though.
     
  19. DMiller

    DMiller Senior Member

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    Occupation:
    Almost Retired
    Location:
    Hermann, Missouri
    Still fall back to old school
    Cuts should be made deep enough to strip material but not load machine down so far that need to unload before next bite
    Long shallower cuts will produce more consistency than gouge loads
     
  20. Curt James

    Curt James Member

    Joined:
    Mar 24, 2018
    Messages:
    5
    Location:
    Virginia
    Did you get any answers on this post. My unit has same issue. Curt