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komatsu

  1. P

    Komatsu PC30UU3 - slow and overheating hydraulics

    Hi all, I’ve got a Komatsu PC30UU-3 Serial No. 13417 mini excavator that has slow and overheating hydraulics. Works fine when it’s cold, but once it’s worked for a couple of hours, will struggle to lift the boom (very slow) and sluggish controls all round. Machine starts up fine and has plenty...
    • Pralhad Birdi
    • Thread
    • excavator komatsu mini excavator overheating slow hydraulics
    • Replies: 1
    • Forum: Excavators
  2. Mzdiesel

    Komatsu 300lc-7 multi-function slow

    Hey all, I’m looking at a komatsu 300 LC -7, I believe. Serial #A90215. I believe I am dealing with a lot of leakage/ priority issue. The main complaint is that you cannot perform two functions at the same time. If you raise boom and bucket the boom will pretty much stop same for bucket and...
    • Mzdiesel
    • Thread
    • cat dozer excavator help hydraulic komatsu
    • Replies: 6
    • Forum: Excavators
  3. E

    Trip to Komatsu Japan

    Recently I visited the Old Komatsu HQ in Komatsu City Japan where they have a little museum and some old books and articles about the history of Komatsu. I was most interested in reading about their relationship and development of the Komatsu Shantui joint venture. We had been importing Shantui...
  4. D

    Komatsu PC20 Rexroth Valve

    Hi everyone, I’ve an old Komatsu PC20 (or FAI 232) Triple Gear pump and rexroth control valve. It has bucket in/out problems. I’ve checked the pilot pressure, low rpm engine, 10bar, when you do every other movement it goes up till 30bar but doing bucket stay still on 10, if you do combined...
  5. P

    Komatsu D21a-6 Steering Clutch Removal: CAN’T PULL CLUTCH OUT OF HOUSING

    I’m trying to remove the steering clutch out of a Komatsu D21a-6 but can’t get it to budge. I have unbolted the 16 bolts (eight on each side) holding the clutch drum in place, full can of PB blaster to break any corrosion between drum and flanges, rigged a comealong straight above and tried...
    • patriksartz
    • Thread
    • d21a-6 komatsu removal steering clutch
    • Replies: 7
    • Forum: Dozers
  6. C

    Searching for a Komatsu Dozer D375A-8 2023 or Newer

    Hey Y'all I hope everyone is doing well and had a good thanksgiving last week! I am starting this thread because I am having some difficulty locating a dozer we need to purchase and add to our fleet. We are looking for a 2023 or newer Komatsu D375A-8 Dozer. The Dozer we are looking for can be...
    • CAG
    • Thread
    • dozer komatsu komatsu d375 komatsu d375a-8 mining dozer mining equipment new and used mining equipment
    • Replies: 0
    • Forum: Dozers
  7. J

    Komatsu D37px-21 monitor panel repair service

    Hello, I recently bought a d37px-21 dozer that needs repair to the monitor panel. Does anyone have a service they recommend? The panel lights up upon key on, and shows the engine hours in the bottom left display. After that the bottom left display blacks out. The gauges never turn on.
    • John V
    • Thread
    • komatsu monitor monitor panel repair
    • Replies: 8
    • Forum: Dozers
  8. B

    komatsu pc300-7 heater now working

    hey guys, have a komatsu 300 and the heater recently stopped working, both coolant lines coming in and out of the cab are hot. confirmed the blend door moves when trying to change the temperature but only ever blows luke warm air. could it be a bad heater core? any help would be appreciated
  9. H

    KOMATSU dozer

    Has anyone had this problem? Komatsu Dozer, hour meter will count by .1, then random will go up by .2. LCD hour meter
    • Hodevelopment
    • Thread
    • komatsu komatsu 120-6 komatsu d39px
    • Replies: 3
    • Forum: Dozers
  10. D

    komatsu d65E-6 transmission issue

    Hey guys. I'm new to the forum and am looking for any input on the transmissions of the late model d65. I purchased it about 3 years ago from my grandfather who had it under a barn for 15 years. He claimed it had zero issues but he's known to be a bit hard headed when it comes to equipment. I...
  11. H

    2009 Komatsu D39PX-21A E03

    Have a 2009 Komatsu D39PX-21A dozer throwing a E03 code. Only turns on after about 1-3 minutes of operating. Won’t turn on when it’s in park no matter how long it runs. Machine runs strong and doesn’t go into to limp or bog down.
  12. TerrainTamer

    PC50UU-1 Track/Undercarriage Types — Questions on Rubber Tracks

    Hi all, I’m looking at a PC50UU-1, almost certainly a grey-market machine, with a serial number around 15xx. It’s fitted with rubber tracks, but I have some doubts that they are the correct ones for this model. Observations: The tracks don’t sit well in the load rollers. The idlers show flat...
    • TerrainTamer
    • Thread
    • digger gray-market komatsu mini excavator pc50uu-1 rubber track
    • Replies: 0
    • Forum: Excavators
  13. C

    Komatsu D20P-5 injection oil line leak

    Hey all, I recently acquired a komatsu D20P-5 with the 4d94 -2n engine. The dozer had been sitting since approx. 2007. After getting it started, it started to leak oil from what looks to be a fitting attaches into the block to a oil return line for the injection pump, I have been searching...
  14. K

    Komatsu pc228 code 306

    How’s it going gents, I have a komatsu pc228, the motor will not start. Acting like it’s under full load from the pump, I have code E306, the feedback potential circuit is abnormal, we tested the solenoids and we’re getting the in between 40-60 ohms of resistance the book requires and they were...
    • korbind96
    • Thread
    • 306 code eletric engine excavator hydraulic komatsu komatsu 228 pump
    • Replies: 2
    • Forum: Excavators
  15. R

    Pc50uu-1 mini excavator final drive cover plate removal

    In trying to service my komatsu pc50uu-1 final drive. It started to feel weak on the one side and then abruptly stopped working. I sourced a complete final drive for around $2k but would like to just replace the drive shaft if that's all that's destroyed in there. The oil was very glittery...
  16. C

    Won’t stay running

    So currently at work we have a Komatsu PC78MR-6 that had a bad primer pump to the fuel filter that has been replaced and a new fuel filter installed, but yet when I go to crank it over it blows white smoke now like it did before still also it will shake violently and will not stay running for...
    • Collin114
    • Thread
    • fuel issues komatsu wont stay running
    • Replies: 7
    • Forum: Excavators
  17. K

    Komatsu PC35 MR-3 2014 unknown buttons

    Hi everyone. I bought the excavator mentioned, but I'm not sure what buttons 1 and 2 that I attached in the picture are for. Does anyone have an operation manual for the Komatsu PC35MR-3? Thanks in advance!
    • komatsu_power
    • Thread
    • excavator galeo komatsu komatsumini mr3 pc35 pc35mr-3 pc35mr3
    • Replies: 0
    • Forum: Excavators
  18. O

    Komatsu pc50uu-2 hydraulic problems

    I just bought this komatsu PC50uu-2 I can't get the offset boom back straight or to the right it's stuck in front of the cab and if I hit the pedal to move it right the blade goes down any help would be nice and if anyone has the operators manual and any other manuals for it could I get them...
    • oneslowf350
    • Thread
    • komatsu komatsu pc50 komatsu pc50uu komatsu pc50uu-2
    • Replies: 0
    • Forum: Excavators
  19. K

    Skid steer or payloader for Topsoil screening machine

    New here and I'm sure it's been asked before but im trying to figure out if I need to look for a smaller payloader or keep with my bigger skid steer to use with my screening machine it runs about 30yd per hr of cleaned dirt. Right now we are running it with my case 95xt and a pc50 mr2. The...
  20. D

    Komatsu d39-21a issue

    Hello I’m new to the komatsu world and have a 2008 d39-21a dozer. great little finish dozer but sometimes when running (usually in reverse) it was kinda jump like you went to neutral or hit the brake just a split second. Does it in forward but not nearly as often. Have also noticed that mainly...
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