Cat 977L Fuel Leak

[Nige]

Anything's fixable.
This thread should give you a few ideas - https://www.heavyequipmentforums.com/threads/cat-977l.87515/
If you can get the pair for scrap value there ought to be possibilities.

 

[jezow2010]

Can anyone weigh in on popping the glow plugs to access the cylinders with some lube?

How is everything else on these machines? Are transmission and brake issues common? Are the final drives really a problem point? The oil in these looked mint. If you want to replace tracks what are your options and how much money would you plan on?

 

[Nige]

HEF's tame fuel injection specialist was opining not long ago about an easy way to remove glow plugs. Let me see if I can find a link. Either way removing the glow plugs would allow lubricant to be injected directly into the cylinders.

 

[Delmer]

Tracks will cost more than the machine is currently worth by the time you're done, and you might not get the cost of tracks back if you have to sell in a few years, total. You have to have some serious work to be worth keeping one of those running. Now, if you enjoy working on stuff like this, you could possibly make one good one and keep it going with parts. "scrap value" is not the weight times price at the yard, "scrap value" is what someone is willing to pay to come and remove a very large and hard to move carcass, for negotiating purposes.

 

[ChrisUK]

Anything's fixable.
This thread should give you a few ideas - https://www.heavyequipmentforums.com/threads/cat-977l.87515/
If you can get the pair for scrap value there ought to be possibilities.

Thanks @Nige

 

[ChrisUK]

What ever went thru the gear train on the last few photos may have wiped out a worthy overhaulable engine, timing cover busted, mounting plate bent and injection pump who knows. SALT rails, may have some life left internally Pin to Bushings, need to look at bushing wear and if any of the seals have failed with oily greasy residue inside the link ears. Sprocket segments on the Dozer Shoe unit are pointing, around 60-70% worn, rollers would need to be checked for frozen or busted flanges on that unit. Large Tooth Shaped rail section is the Master Link, remove the rail shoe bolts and beat the dickens out of that to separate to remove a rail. To measure Rail wear, get the rail tighter, across four segment(five Pins) measure as close to Ctr to Ctr or edge of a pin to same edge of a fifth pin away and divide by four. Either one of those and or both will be MONEY pits for awhile to get 'Functional Enough' to work.

@DMiller that last sentence has hit the nail squarely on the head !

 

[DMiller]

Yep, anything's fixable as long as cash flows!!

 

[jezow2010]

Here's what to look for based on the 11K05182 S/N. The same manuals might apply for the other machine but that is not guaranteed. See comments below.

SEBU5374 - Operation & Maintenance Manual - $30
UEG0732S - Parts Manual - $124
REG00635 - Service & Repair Manual - $200.
Prices quoted are for pdf downloads and/or CD as appropriate. The service manual is not available for donwload AFAIK, the nearest option that is not in paper form is on CD.

The 11K prefix covered both 977K and 977L loaders. There are 4 different ranges of the 11K prefix, 1-3918 that are badged as K model, 3919-5050, 5051-7762, and 7763-Up. The last 3 groups are all L models. Different manuals can apply to different groups, especially for parts.

You may find some useful information in this link - https://tractors.fandom.com/wiki/Caterpillar_977K

Do you have a source where I can find the manuals on CD? Specifically REG00635. Google doesn’t show me much. Machines in their new home -

 

[Nige]

Do you have a source where I can find the manuals on CD? Specifically REG00635.

Try here - https://www.servicemanualpro.com/?page=Products&searchbox=11K05182

 

[bunkclimber]

I saw the YT video you posted the 977L runner it didnt sound too bad, mighta just needed a good afternoon snortin' to clear it out..shame about the one with the smashed engine..even the injection pump off of that coulda brought $500 or better as a core..anyway there's still a lot of these 977s out there for sale cheap,I'd pass on these two..unless like maybe if one had a winch..but those are golden hen's teeth anymore..

 

[jezow2010]

Ok well too late to pass haha …

have the service manual and replaced the transfer pump assembly and the hand pump. Got the system bled out nice and now when you pump the hand pump it just pushes out that same overflow.

From what I understand that drains the cavity between the two seals for the injector pump drive shaft. So the fuel side is bad and it’s leaking past the seal and down the outlet.

the manual I have is the wrong engine layout… it matches the other 977L but the machine in question seems to be more of a 977K. Picture of the engine serial attached.

does anyone have any info on what that seal and cavity looks like?

 

[Nige]

the manual I have is the wrong engine layout…

Wrong manual for the engine in 11K05182 or for the other machine.?
On which machine is the 3N01759 engine S/N plate.?

 

[jezow2010]

Wrong manual for the engine in the 11K05182 machine. That’s the machine the engine tag is from. I’m pretty confused by this… the manual clearly says it covers the 05182 machine but it’s not correct, the machine looks exactly like the K machine that was cannibalized. Is there a chance someone put an older engine in the 05182 machine…?

 

[Nige]

Is there a chance someone put an older engine in the 05182 machine…?

I am almost sure not. I can't date or relate the engine S/N to the tractor Serial Number, but see below.

Regarding only engines and ignoring all the other machine changes made during production of the 11K-prefix 977 models........
Machines with S/N from first built up to 11K3918 were badged as K models and had a 170FWHP D333 turbo engine.
S/N from 11K3919-5050 were badged as L models, retaining the D333 engine but with power increased to 190 FWHP.
For both the above ranges the original engine installed during manufacture of the tractor would carry the same Serial Number as the tractor.
S/N from 11K5051-7762 were again badged as L models. The D333 engine was replaced by a 3306 (3N-prefix) engine but retaining the same 190 FWHP. So your 11K5182 with a 3N-prefix 3306 engine is right. Also the 2P8604 engine arrangement on the engine plate is only listed as being for use in 977L machines.
Whether the engine is the original one fitted to the tractor is another matter. I suppose the possibility exists that the engine might be a later one than the original engine installed in 11K5182 but as S/Ns go 3N1759 is a pretty early 3306 engine.

 

[jezow2010]

So it appears it is just an early 3306… is guess the serial number told me that on the engine *facepalm*

any ideas on what manual I need for this specific injection pump variant? I combed my manual last night and it just is based off an entirely different injection pump and fuel system.

 

[Nige]

Can you find any Part Numbers on the injection pump itself, maybe a Part # tag or a casting number on the body.?
I suppose that it is possible that a different FIP to the one the engine was originally built with has been installed. 11K machine s over 7130 had a different fuel system (sleeve metering) compared to the earlier models.

 

[jezow2010]

That’s interesting and makes sense as to why the newer machine (07393) has the newer, sleeve metering fuel injection system. Just a bummer as to why the manual does not cover both styles. I will try and get a good picture of the FIP in question.

 

[Nige]

Just a bummer as to why the manual does not cover both styles

What is the pubication reference number of the section of the manual where the "System Operation" ofuel system information appears.? I just checked SENR7593-01 online and it includes both New Scroll Fuel System (NSFS) and the sleeve metering fuel system. I'll send you something. Keep an eye on your messages.

 

[jezow2010]

I actually went back to the scrapped machine and tore the entire injection pump off to see if I could find the issue. Few things -

1. for the hand primer pump what way does it go?? The machine we have had the inlet sucking from the fuel filter housing by the bleeder and the outlet went to the injection housing in the fitting near where the fuel comes from the tank. When we pumped it would blow bubbles in the tank. We flipped it to what the manuals show - from the tank is the bottom or inlet side and then it outputs to the fuel filter housing by the bleeder. Now it pumps correctly but unless the breather is completely open it just dumps fuel out of the drain in question.
2. The drain in question, after looking at the casting, has two potential sources - the fuel transfer pump (which is brand new now) and a channel from the fuel filter housing. I do not have this housing at the moment but from what I can tell it’s the drain from a fuel bypass valve? Does anyone have anymore info on that…?

3. how does the transfer pump route its excess fuel back to the inlet? Is it the bypass internal to the pump? If it is through the primer pump then it seems it would have to be mounted ‘backwards’ as we found it on the machine.

a good picture of a K or L fuel pump setup would go a long ways in determining the primer pump direction in question.

 

[jezow2010]

More pictures, also meant to say if the bypass is messed up and or it goes through the hand primer pump I could have dead headed the new pump and blew out the seal that would cause this leak. To me, it seems as if it’s way too much fuel to becoming from that pump. It seems like the pump is dumping it through this.