Komatsu PC130

[EddieWalker]

Where is the fuel pump? The fuel pump is before the injector pump. Two seperate things. Where is the original fuel filter? That has to be before the injector pump. The injector pump is the last thing the fuel goes to before being split into four different lines that go to your injectors. That is if you have a four cylinder. If it's a six cylinder engine, they it splits the fuel to six lines. There should also be a return line somewhere that sends the fuel back to the tank.

To figure this out, you need to go step by step. How do you know that you are not picking up what you missed in the tank and plugging up the line again? Is the fuel line in the tank at the bottom of the tank? Can you raise it?

 

[WoodChuckDad]

Where is the fuel pump? The fuel pump is before the injector pump. Two seperate things. Where is the original fuel filter? That has to be before the injector pump. The injector pump is the last thing the fuel goes to before being split into four different lines that go to your injectors. That is if you have a four cylinder. If it's a six cylinder engine, they it splits the fuel to six lines. There should also be a return line somewhere that sends the fuel back to the tank. To figure this out, you need to go step by step. How do you know that you are not picking up what you missed in the tank and plugging up the line again? Is the fuel line in the tank at the bottom of the tank? Can you raise it?

Ok. The fuel line goes from the bottom of the tank to the fuel pump which also has a priming pump on it. The line then goes from fuel pump to spin on filter and two lines come out of that and starch to opposite sides of the fuel injector. And on one of those attachment points from the fuel injector there is a line that goes back to the top side of the tank. As the return

 

[WoodChuckDad]

And I am pretty sure I'm not picking up any left over crud because I put a see thru filter inline, on the fuel supply line and it's clear and pink and looks fine.

 

[EddieWalker]

I did a google search and put "Komatsu PC130 priming pump" and came across this

The fuel transfer pump has a strainer in the banjo bolt that connects that tank hose to the pump. The bolt is on the bottom of the pump and if your machine has air conditioning it is very difficult to get at and get out. Once you get the bolt out look at the end of it and you should see the white plastic with a screw driver slot in it. Unscrew the strainer from the bolt and blow it and the hollow in the bolt out with air pressure. There are two seals for the fitting and most people loose the one that goes next to the pump. You can get copper fuel line washers from the local auto parts supplier to work if you loose the originals.

 

[farmer2009]

How would I tell how much return I get?

Without a spec manual it's hard to say. But take the return line off and run into a bucket. Start machine and note how full return is running. Wait for power decrease to start and note how much return you are getting. If return doesn't seem to change injector pump. If return slows or stops fuel flow problems.

Try Eddie's screen fix first.

 

[WoodChuckDad]

I did a google search and put "Komatsu PC130 priming pump" and came across this

The fuel transfer pump has a strainer in the banjo bolt that connects that tank hose to the pump. The bolt is on the bottom of the pump and if your machine has air conditioning it is very difficult to get at and get out. Once you get the bolt out look at the end of it and you should see the white plastic with a screw driver slot in it. Unscrew the strainer from the bolt and blow it and the hollow in the bolt out with air pressure. There are two seals for the fitting and most people loose the one that goes next to the pump. You can get copper fuel line washers from the local auto parts supplier to work if you loose the originals.

Tomorrow i will get some copper washers for fuel line and attack that fuel line fixture. First though, I have to do my 50 hour maint to my tractor...hoping that won't take too long, but I have heard horror stories. So Tractor in the morning, and Excavator in the afternoon.

 

[WoodChuckDad]

Without a spec manual it's hard to say. But take the return line off and run into a bucket. Start machine and note how full return is running. Wait for power decrease to start and note how much return you are getting. If return doesn't seem to change injector pump. If return slows or stops fuel flow problems.

Try Eddie's screen fix first.

getting to that return is going to be an absolute beast. Not saying it can't be done...but it will suck...and after looking at the schematics...there seem to be two lines that are designated as fuel lines.one right next to the return. I need to look into the tank again because I didn't see anything in there that looked like tube from above. I am going to attempt Eddies's fix first.....which will be hard, since my machine was equipped with A/C. This is not the fun I thought I was going to have this week.

 

[farmer2009]

getting to that return is going to be an absolute beast. Not saying it can't be done...but it will suck...and after looking at the schematics...there seem to be two lines that are designated as fuel lines.one right next to the return. I need to look into the tank again because I didn't see anything in there that looked like tube from above. I am going to attempt Eddies's fix first.....which will be hard, since my machine was equipped with A/C. This is not the fun I thought I was going to have this week.

You don't have to get at the return right at the tank. If you have a flex line mid ways that's easy to get to then do it there. Even if it means adding a piece of hose and rerouting the line temporarily.

 

[WoodChuckDad]

I found a shop manual. I have been looking at diagrams all morning. Heading out to the farm now. Not going to to do much more than pul lines and blow out with compressed air, since I think disassembly of the injectors is major surgery, and far above my skill set level. IF the banjo bolt screen doesn't work out, I,ll probably check into the return volume.

 

[WoodChuckDad]

I did a google search and put "Komatsu PC130 priming pump" and came across this

The fuel transfer pump has a strainer in the banjo bolt that connects that tank hose to the pump. The bolt is on the bottom of the pump and if your machine has air conditioning it is very difficult to get at and get out. Once you get the bolt out look at the end of it and you should see the white plastic with a screw driver slot in it. Unscrew the strainer from the bolt and blow it and the hollow in the bolt out with air pressure. There are two seals for the fitting and most people loose the one that goes next to the pump. You can get copper fuel line washers from the local auto parts supplier to work if you loose the originals.

EddieWalker, you are a wonderful human being. It was the Banjo Bolt strainer. As soon as I got it loose and started to unscrew it, my hand was filled with gritty crud and I knew it was going to work. I took out the screen, which did not want to budge because of all the grit, cleaned the banjo bolt, screen and the elbow that attaches to it with carb cleaner. I then blew out the hole the bolt goes into, with compressed air. put it all back together, primed it, and started up Let it idle for almost 4 minutes then reved it up and started digging. Took out a big stump then started moving so small logs....when 10 minutes had passed, I went after a large oak tree top. I ran it for an hour then stopeed to fuel up again. IT ran well all day....I stopped working at 8:15 when I could not longer see. I did notice that the inline filter is already dark and has grit in the bottom of it. I will swap that out tomorrow and start looking for a better filter....one with a valve in the bottom of it.

 

[kevin37b]

Glad you got it fixed .

 

[EddieWalker]

That's awesome. Congratulations!!!!

Isn't it amazing how much junk gets into there?

I know that with mine, it was very similar. I have several cheap Fram plastic fuel filters on my shelf and went through a lot of them when I first started having issues, but now it's just a few times a year that I replace it. I don't think you need anything fancier or more expensive then those Fram inline gas filters. I get them at Walmart. All they do is catch the crud coming from the fuel tank before it gets to the rest of the system.

 

[farmer2009]

Good you got it fixed.

If you are still having issues with the crud try refueling at night when you quit. This will let things settle before you start the next day.

 

[gghb]

good job fuel system problems can be frustrating. this kind of stuff is common with equipment that does'nt get used much if you don't keep the tank full. i keep the top half of the tank full all the time.

Greg

 

[WoodChuckDad]

That's awesome. Congratulations!!!! Isn't it amazing how much junk gets into there? I know that with mine, it was very similar. I have several cheap Fram plastic fuel filters on my shelf and went through a lot of them when I first started having issues, but now it's just a few times a year that I replace it. I don't think you need anything fancier or more expensive then those Fram inline gas filters. I get them at Walmart. All they do is catch the crud coming from the fuel tank before it gets to the rest of the system.

I'm hoping that if I'm vigilant it will clean up the tank enough that it isn't a constant thing. Halfway thru the day, today, I felt that loss in power. The inline filter was very dirty with a large deposit of crud in the bottom. I changed it out and back to mormal

 

[WoodChuckDad]

In my zest to make up some time today I cause my self some stupid tax.





Fortunately it isn't too expensive.

 

[Rustyiron]

Go Eddie!:cool2:

 

[WoodChuckDad]

Having missed 5 days of use, and being near the end of my vacation, I pushed the envelope as hard as I could to get things cleared. I have taken down the trees on approximately 2 acres. I'm hoping my lumber guy comes thru and has moved them off that parcel of land so I can start using the tractor to prepare the soil. The night I got it running again, I broke the windshield.....The next morning I had to get online and put in a few hours for my day job. I got out there and put in some plexiglass as a temp fix.....and broke it within the hour. Too much enthusiasm.......and to top it off, a few hours later, I saw that there was a crack in my bucket. all I can figure is that I didn't dig as much as I should have on a stump, and instead, I was prying and pulling. That was an hour before dark....I kept working, trying to be careful with it...First thing in the morning I was calling around trying to find another bucket...no dice. Called a local welding shop and by chance, they had one of their guys finishing up a job that morning. at 9:15 they called me and said they could get him out there in 20 minutes. I met him and showed him the way and he had it repaired and I was back at to work a little after noon. Quotes for a new bucket were around 3 grand. I didn't find any used that would fit. Today, since I was back home, i called the local Komatsu equipment dealer who had the windshield I needed for less than the internet price, and also who could get me a bucket in 2 days for over a grand less than I was quoted elsewhere. I need an 18 inch bucket anyway, because I have to dig the channel to put in conduit for our power to get the half mile from the road to the homesite. It was an easy decision. This has been an adventure so far.

 

[EddieWalker]

Nice that you got the welder there so quickly!!!!

I've also found that it's a good idea to talk to the dealer before assuming they are the most expensive option. While I still get filters and other stuff from Napa for less then the dealer, when my turbo went out, it was cheaper to buy a new one from the dealer then to have the old one rebuilt. Same thing with the rebuild kit for the Cummins diesel engine in my dozer. Case was significantly cheaper for the kit then Napa or any of the other auto parts stores I checked with. It's all trial and error where to go for the best prices.

 

[WoodChuckDad]

So, after Eddie's fix with the banjo bolt, I have been going strong. I've had to change the inline filter twice. First time after 1 day and the next time after almost a week. I'm going to keep an eye on it, but I think the fuel issue is under control.

Since I will have a very long trench to dig, as well as footings for the house, and lots more stumps to deal with. I picked up a little something for the Komatsu today.