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PC390LC-10 Undercarriage Compatibility

Discussion in 'Excavators' started by 631G, Nov 8, 2021.

  1. 631G

    631G Well-Known Member

    Joined:
    Apr 27, 2008
    Messages:
    200
    Occupation:
    Civil Superintendent
    Location:
    Georgia
    Would anyone have some insight into what determines if an undercarriage from an older model excavator from the same manufacturer will fit up to a newer model machine? In this instance I am looking at a Komatsu PC390LC-10 SN: A30059 and if I can reuse an undercarriage off a burned PC400-6 machine. The local Wilson Finley rep quoted me using a set of rails for a PC400-6 in the line description and so I looked into it and found that the PC390-10 and the PC400-6 and PC400-7 share the same number of top rollers, bottom rollers, track length and track length on ground.
     
  2. Vetech63

    Vetech63 Senior Member

    Joined:
    Aug 10, 2016
    Messages:
    5,145
    Location:
    Oklahoma
    Pin and bushing measurements, pin centers to pin centers, sprockets teeth count, pitch, and spread
     
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  3. John C.

    John C. Senior Member

    Joined:
    Jun 11, 2007
    Messages:
    12,516
    Occupation:
    Machinery & Equipment Appraiser
    Location:
    Northwest
    Komatsu apparently stopped making their UC manuals years ago so I don’t know. I do agree with Mr. vetech that if the pitch and bushing diameters are the same, they will fit.
     
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  4. gggraham

    gggraham Senior Member

    Joined:
    Feb 13, 2009
    Messages:
    512
    Occupation:
    Licensed Heavy Duty Equipment Mechanic
    Location:
    London Ontario Canada
    Chains for 390-10 are KM2489/49 Link, 400-6 same chain but only 46 link.
    TCR 390-10 KM4184, 400-6 is KM1817
    Bottom Rollers are the same on both KM1743
    Sprockets are the same on both KM2384
    Idlers are the same on both KM1973
     
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