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PC390LC-10 Undercarriage Compatibility

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

  1. 631G

    631G Well-Known Member

    Apr 27, 2008
    Civil Superintendent
    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

    Aug 10, 2016
    Pin and bushing measurements, pin centers to pin centers, sprockets teeth count, pitch, and spread
    LACHAU and mg2361 like this.
  3. John C.

    John C. Senior Member

    Jun 11, 2007
    Machinery & Equipment Appraiser
    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.
    Vetech63 likes this.
  4. gggraham

    gggraham Senior Member

    Feb 13, 2009
    Licensed Heavy Duty Equipment Mechanic
    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
    Vetech63 and John C. like this.