Rpm surge is the governor motor. Seeing this has electronic throttle I’d have to say one of the phases is out of the gov. motor. Tip: to cancel cold idle warmup mode, before start turn the dial to 100% for 8-10 seconds then return to low setting; start it. It should low idle. Also turn the pilot pressure up to 32-40 KG (500-600 psi.) you’ll notice a speed difference in the functions. Great machine but parts are very scarce for these anymore. I have been a komatsu master tech for a few years now.
yeah i agree with everythinng patrick said ....im not as impressed with them but but looking into the gov phases and wiring and pot would be a good jumping point. ive worked on a few komatsu's and these govenor motors seem to be very temperamental combined sometimes with weird spring dampening linkage made from the highest grade of chinesium(went thought about 1-2 a year of oem komatsu gov linkage on the pc120lc6 i worked onif i rember right they had a revison to that part twice i think) . combine that with poor wiring harness routing(often routed as neer to pinchpoints as possible and as low as possible to make sure it was for sure to get soaked with hydraulic oil at some point), not so quality yet pretty pricy electronic- pots , motors, sensors, ect. the majority of the problems we came across were electrical , mixed with annoying "komatsu" hydraulic fittings and just a general lack of well thought out engineering on silly stuff and dependability. these are fine machines just disappointing in my opinion it wouldn't be my first choice for any business needing dependability, fine for some one looking for something on there property or farm or small operation especial if its any older than say 2008ish. the manuals leave alot to be desired as well. they aren't the worst machines by any means just disappointing worked on a pc120 lc6 pc200lc8 pc180 lc8 D85-12 pc220-8 pc400lc7
FYI boys, my 1986 pc 200-3 has 19,000hrs on it and hasn’t missed a beat. She spent her prime working in civil, bulking out, hammering, doing sewer connect and final trim, her older years in forestry. now she’s in semi retirement making our land look pretty. In saying that my father bought it new and we both know how to look after our gear. A few ram seals, new set of chains, some pins and bushes is all she’s had done. Shows how long gear can last if you’re not a cowboy.
use to operate a PC300, other then an operator running the fuel dry and killing the diaphragm pump (one electrical pump later) and a starter dicking about you told her to work and she did it, even if she was parked up for 6 months. one of the most reliable machines we ever had
Komatsus are very reliable. peak japanese engineering. unfortunately they are not that common in USA. in Asian countries, Komatsus absolutely dominate CAT
@ 12:25 ...and he drove off into the Sunset. Legend has it, he is still going, looking for that Big Gold Mine in the West, only stopping for Fuel and Beer. He can't shut it off, ever.
"Let me on this piece of shit real quick." Never thought that thing would start in a million years and wondered why a 20 minute video? Fires right up...)) Good job, KT & pops!
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The company I work for had a job in the early 2000’s that they ran a PC1000 on. Sadly I never got to see it but every time they had to move that sucker, they had to remove the stick and load it on a 9 axle truck. What a unit.
Won’t start - gonna need a bigger hammer 🔨 .. I like that snap ring battery cleaner tool, have one just like it .. and they way he MacGyvered the starter - classic in the field on a cold sunless Sunday .. But she fired up and sounds pretty healthy .. I’d trade my Jeep for it … Those ol Komatsus are built like tanks . Can run the dog piss out of them putem away wet and they will still come back for more .. Ok so a little slack in the pins - to be expected… Always great content ! Hope you guys have a great and wonderful Merry Christmas!
After watching you Gerry rig an air start 3508 I had complete faith in the two of you getting that unit up and running for a test ride Happy Holidays boys hope you and your families well in the new year
Great diggers I've ran a few even old ones with levers and they had great reach for size tracks never rolled good on a few inless used every day china iron or somthing
Sounds like more a safety fuel cut than a surge. It's maybe a accelerator cable or fuel solenoid badly adjusted wich make it over rev,so the fuel cut is doing its job at reducing rpm.
Pretty hard to beat the reliability of those generation of Komatsu diggers. I wonder if that 400 has the M11 Cummins in it. My best bud has over 14k hours on his old 89x200LC.
Looks like a good machine to buy for a specific job and write it off on that job.. you got a job that's going to cost you $30K to dig, you buy this and run it the way it is.. Looks like it hasn't dug in rock at all..fair bit of hours but it hasn't been shit kicked, just lacking some TLC for a while
I agree that doesn't even look like a construction machine- the house is too nice. My guess would be aggregate or topsoil only, especially with those hours it was run a lot but not hard
not at all likely, especially seeing as its farm country and they know farmers will take they're tractors, seeders and combines on it. It'll be engineered to take some weight, 100,000lbs really isn't all that heavy in general.
@@haydona1845 And in my area we load a haul truck or a D-11 on 2 flatbeds pulled by two trucks side by side down the highway to the repair shop, or the dismantle area for rebuilds.
Sounds like someone might've played with the governor trying to speed her up a little. The governors should stop working against each other if you back the vs section down 50-100 rpm.
This might be a suitable companion for the haul truck you acquired a while back. Counterweight is beat up some and the undercarriage needs some love, but it’s willing to work. Good job bringing it to life! 👍
I don't understand why these heavy equipment manufacturers don't use replaceable bushings between the pin and the welded bushing. I own a large machine shop. We currently have a job where a company's scissor lift has wollard bores as a result of the pins wearing away the bores. We had to bore the wollard bores oversize and weld in a turned sleeve. We then bought an Oilite bronze bushing, but grease grooves on the ID of the bushing, shrank it with liquid nitrogen and installed it in the new sleeves. Now the pin rides freely, has a PROPER bearing surface, and has grease grooves so more of the grease can get to the pin surface. It's amazing that bores in the welded steel plates, some grease and a pin are acceptable in the heavy equipment world. I certainly haven't seen a ton of heavy equipment, but we manage to do this repair quite often.
great machines. easy to work on. no little sensor that will shut your machine down like the new ones until the dealers mechanic comes out to rob you blind!
My father had the same excavator growing up, sadly it died in the woods threw a rod and grenaded the engine. Now that's not being tough on Komatsu, the only maintenance that piece of equipment got was a wash when it was raining.
I was fixin' Christmas Eve dinner and didn't get to watch, just listen. Reckon I'll have to watch this whole thing again and pay attention next time. Merry Christmas to all you fellers out there. Wishing the best to y'all and your families.
Nice machine..cycle times looked slow on hydraulics judging how slow the stick and dipper moved..unless you guys weren’t full on the controls. Engine fired right up, sounded strong…tracks might need to be tightened, I’ve seen those things walk themselves off the sprocket. Any stress cracks in stick or dipper? Probably be a nice farm machine..certainly dig a deep hole.
I was wondering about that. I don't know if they said it made it to the sight glass or not. I'm guessing not, I think a couple times I could hear the pump cavitation begging for more fluid. They probably only had 1 jug with them.
I have the GB-70 version of your power pack and I was blown away after we tested it on four trucks back to back three of which were 5.9 Cummins. If they only had a quality version with a tire inflator as I'm on my sixth now. Edit: manually engaging the starter is why I'm here. Not many people would have thought of that. Definitely something I'm going to remember.
I just bought one of these 3 weeks ago at an auction in similar condition. a heap of work ahead of me finding leaks and re doing the stick cylinder but the machine has a bit of soul to it. you can tell its worth looking after even though its old.
My 2 cents, Tracks definitely loose, sprocket's are shot. Common crack's in boom are lift pin anchor and stick cylinder anchor. Shimmy up that boom and look. Basically anywhere there are bushing's worn un even put's additional stress on boom and stick. Stretch boom out and sleight down pressure, hold at that point and measure upper structure to lower structure. Lift boom and measure again. This gives you swing bearing wear. At $10000 for a bearing this is important. Outside of these, this was an awesome Machine if you needed something this big. Bitch to move sometimes dependent on state you are in, but good machines. I have also seen the swing bearing crack so look closely between bolt's.
I don't own nor work on construction equipment but I like learning as much as I can so I appreciate people like you that take the time to write a comment that educates and helps others. I've saved thousands from reading comments alone so again, thanks.
@@duncandmcgrath6290 2.5 ton of internal tooth ball bearing precision ground to .002" or metric equilevent with 96 25mm bolt's each 150 mm long don't come cheap. Then add in the labor of spliting the machine upper structure from the lower and 10 years ago that was the bill.
@@dzrdr65 we had the same issue with our komatsu about 1 year ago. Repair cost with some other small stuff would be around 15000€ here in germany. Sadly that was the reason to let the old girl go. We got a liebherr 936 as replacement, but the old komatsu will definitely be missed.
"Since this time and two more will be the third time I've done this".....LMFAO - Y'all are hilarious, the dry humor is too good! Former submariner and shitty weekend amateur mechanic here, trying to fix up the '65 Chevrolet stepside that my grandpa gave me before passing away. I've learned tons of good information and tricks/tips from your videos. Will never touch a piece of heavy equipment in my life probably, but this is high quality entertainment and is much appreciated! Best of luck to ya!
Yes, it was reved, but it wasn't over-reved and wasn't up high all that much . Yes, it took a little minute to settle in at the governed rpm, so what . What do you think he wants this machine for, to deliver Amazon packages ?
In 1986 I had the pleasure of spending about 20 minutes in a new PC-1000. It could load an 18 CY tri-axle to spill with two passes. Had pilot operated controls which made it very easy to control - like a good video game.
Mate your dead right, we have a Komatsu FG25 forklift with a Nissan H20 gasoline motor in it and it spent its entire life from when it was brand new, on the limiter around the shed. I mean that thing copped more pain them those Detroit's KT blew up
Komatsu machines are the toughest beast on any jobsites.I operated the komatsu PC300 to PC500 excavator in the quarry in 2018-2019 before moving to construction and again back in quarry.Komatsu machines have great reliability and heavy duty to amy jobsites.Wave from Malaysia my friend!!
HELL YEAH i love Komatsu machines. Best/funnest loader i ever worked on and operated was a Komatsu 250 with great big ass forks on it. I moved stainless steel intercoolers and drums over to the plasma cutter with it. I think i liked the loader so much because every time i was out of it, i was getting showered with slag lol
Some TLC and look into the hydraulic situation with its slow cycle time…. Engine surging… do some basic maintenance and run it! And just like that…. It’s cheeseburger time! 💀
I have the exact same Snap On ratchet. I probably wouldn't say it's unbreakable. but I have put mine through a lot of hell over the years. and it's always given me really good service. I agree after firing it up checking out that big ole Komatsu excavator. that it was time to go get a cheeseburger. I really like your philosophy it's always spot on.
