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I have a 1989 D4H
- Thread starter James2019
- Start date
Nige
Senior Member
Can you get down much lower and shoot a pic or two of the rollers on the bottom side of the track frame. The wear on the track links looks as though it could be caused by badly worn rollers.
Also the sprockets don't appear to have much life left in them, although the photo isn't the clearest.
Snap a shot or two of the wear surface of the front and rear idlers while you're at it.
Also the sprockets don't appear to have much life left in them, although the photo isn't the clearest.
Snap a shot or two of the wear surface of the front and rear idlers while you're at it.
catman13
Senior Member
- Joined
- Aug 22, 2011
- Messages
- 435
- Location
- oregon usa
- Occupation
- refrigeration engineer/excavation contractor
looks like you have some real bad rollers.
looks to me like the track adjustment piston is almost all of the way out.
looks to me like the track adjustment piston is almost all of the way out.
rondig
Senior Member
Looks like a 10k problem lol
Nige
Senior Member
Do not attempt to tighten the tracks if the measurement 3 in the photo below is 4" or more.
Nige
Senior Member
The sprockets are definitely gone, looks like the idlers are too.
Here's what I suggest. Call your local Cat dealer (Fabick..?) and ask to speak to a PSSR (Parts & Service Sales Rep) who deals with undercarriage.
Give him the impression that you want to buy all new undercarriage for your tractor.
He will come to you at no cost and measure the wear on every component and present you with a report showing how much it is worn, with 100% representing the rebuild limit & 125% the limit if you plan on running it to destruction. I think you are already past 100% from the photos.
Also ask him about what options are available to you in regard to undercarriage replacement - there ought to be more than one. Also ask for quotations for each option.
Here's what I suggest. Call your local Cat dealer (Fabick..?) and ask to speak to a PSSR (Parts & Service Sales Rep) who deals with undercarriage.
Give him the impression that you want to buy all new undercarriage for your tractor.
He will come to you at no cost and measure the wear on every component and present you with a report showing how much it is worn, with 100% representing the rebuild limit & 125% the limit if you plan on running it to destruction. I think you are already past 100% from the photos.
Also ask him about what options are available to you in regard to undercarriage replacement - there ought to be more than one. Also ask for quotations for each option.
Looks like someone rebuilt the undercarriage by replacing just the tracks .
If the slide keys on the front idler are worn the track guides will rub on the rails so look at the inside of the guides.
What do you mean the pivot shafts need adjusting ?
Bob
If the slide keys on the front idler are worn the track guides will rub on the rails so look at the inside of the guides.
What do you mean the pivot shafts need adjusting ?
Bob
If you mean the shaft with the wheel on it that be the track adjuster, the pivot shaft holds the track frame to the tractor.
Bob
John C.
Senior Member
I'm thinking there is more wrong there than what you can see in the photos. The wear shown on that idler leads me to believe and bearings on the equalizer bar are broken and the bushings on the pivot shaft are worn out. I agree with Bluox that the undercarriage appears to have been pieced together with newer chains.
You do have options depending on the thickness of your wallet. First get the CTS report done from a Cat dealer PSSR. From what I see in the photos, not all is completely worn out. The bottom roller flanges are not riding on the track pin bosses so the wear you see on them it likely from the guiding bars on each end of the track frames. The sprocket teeth are sharp and will have to be replaced no matter what you do. Find out the adjustment limits on the track adjuster. You will probably have to take out a link on each side. More than likely you have dry links and one of those is what I'd pull. The wear on the track chain bushings would be the next concern and a photo would go a long way into letting us know just how bad your chains are. If there are holes worn in the bushings, then all is lost and you will need new chains. There is a lot of meat left on rail sides of the links.
Good Luck!
You do have options depending on the thickness of your wallet. First get the CTS report done from a Cat dealer PSSR. From what I see in the photos, not all is completely worn out. The bottom roller flanges are not riding on the track pin bosses so the wear you see on them it likely from the guiding bars on each end of the track frames. The sprocket teeth are sharp and will have to be replaced no matter what you do. Find out the adjustment limits on the track adjuster. You will probably have to take out a link on each side. More than likely you have dry links and one of those is what I'd pull. The wear on the track chain bushings would be the next concern and a photo would go a long way into letting us know just how bad your chains are. If there are holes worn in the bushings, then all is lost and you will need new chains. There is a lot of meat left on rail sides of the links.
Good Luck!
DMiller
Senior Member
Looks as though someone went cheap on UC repairs, with worn idlers, sprockets some wear to rollers but not flange cuts on rails, I am inclined to think adjuster is far too extended, getting rollover in the adjuster and/or the tail idler shaft allowing rails into the rock guards. Get a Low photo on the idlers to rails to the guards positioning.
PEVO
Well-Known Member
Are you confusing the Pivot shaft with the track slack adjuster pistions? Adjusters extended all the way out are sure sign of: worn rail/pins/buschings, drive sprockets and idlers front and or back (your idlers look like they have alot of life in the them from the pix thou) Just replacing the sprockets will take up some slack in those chains. You didnt post pix showing how loose your tracks are...do they droop alot? How much slop or wear do your chains show in the pins and bushings? Real loose wore out chains will really let your tracks flex when going over uneven ground (rocks, logs, etc) i know about wore out UC cause i was dumb and found out the hard way on my purch of a tired D4H. Except for the drive sprockets...your whole UC is in way better shape than mine. Mine has new sprockets but everything else is junk. My adjusters are almost all the way in..because 2 links have been taken out of both tracks and my chains are stretched out due to pin and bushing wear. Thank god i dont rely on this dozer for my income.
PEVO
Well-Known Member
This is a LGP dozer...or it was at one time. (longer UC and blade sticks out farther from front of dozer). Are the pads 24-30 inches wide? Mine are 18. Later standard track pads are 20in i think. Wider track pads will twist and flex more on uneven ground and wear out components quicker. Lots of older LGP wide track dozers are retro fitted with narrower track pads in their lifetimes.
Welder Dave
Senior Member
The rest of the machine looks really good.