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.