• Thank you for visiting HeavyEquipmentForums.com! Our objective is to provide industry professionals a place to gather to exchange questions, answers and ideas. We welcome you to register using the "Register" icon at the top of the page. We'd appreciate any help you can offer in spreading the word of our new site. The more members that join, the bigger resource for all to enjoy. Thank you!

977H track parts interchange with what others

rebible

Member
Joined
Aug 3, 2013
Messages
10
Location
United States
I have an older 977H 53A. It looks like I will have to replace and repair the tracks.

What tracks interchange with it . I can't read the link numbers. But the master link is readable.
It is 2S1750.

It has been hitting the link pin retainers on the carrier roller flanges. This seems to have been going on for a long time from the wear marks. But now it is getting excessive on the left side. The roller right in front of the sprocket on the right side is bouncing around without bearings. I haven't lifted the machine to see what is up with the rest of the rollers. Though at least some are still rolling smoothly.

Wild question, has anyone ever converted a machine like this to rubber tracks. I don't have any rocks and it would be awful handy to be able to cross the road or run down to the neighbors to dig a little. Not to mention dominating the 4th of July parade.

robertbible at gmail dot com

robert
 

DMiller

Senior Member
Joined
Feb 21, 2010
Messages
16,434
Location
Hermann, Missouri
Occupation
Cheap "old" Geezer
This is the site I look to for track interchanges:

http://dracoequipment.com/Parts Links and Pages/All_Cat_107A.pdf

As for their list, D7, D7C, 977 E,H,K
If the link ears are hitting the rollers, first look to the dimensions for the links, then look at your rollers, most likely they are worn so far the flange is extended and hitting the rail ears. Time for rollers or a trim if not already done and rails, 37 link 8.0 pitch. If the pads have no grousers left then you will need shoes too.
 

rebible

Member
Joined
Aug 3, 2013
Messages
10
Location
United States
This is the site I look to for track interchanges:

http://dracoequipment.com/Parts Links and Pages/All_Cat_107A.pdf

As for their list, D7, D7C, 977 E,H,K
If the link ears are hitting the rollers, first look to the dimensions for the links, then look at your rollers, most likely they are worn so far the flange is extended and hitting the rail ears. Time for rollers or a trim if not already done and rails, 37 link 8.0 pitch. If the pads have no grousers left then you will need shoes too.


that is kind of what I was figuring. I did not know that you can trim the flanges. What I am worried about is that it doesn't have the 977 track. The tractor has been around and at some point someone was pretty free in using whatever fit. I sure don't measure 8" pitch. I will go back with mics and check again. I will also recount my pads.

I was hoping to pick up a set with some life still left in it.

I noticed that the 977L and some other D7 have 8.5 pitch...

thanks for the reply...
 

Nige

Senior Member
Joined
Jun 22, 2011
Messages
28,984
Location
G..G..G..Granville.........!! Fetch your cloth.
A 53A was originally intended to run on 8" pitch track links.

However 2S-1750 is a standard LH link (not master link) for an 8.5" pitch track group orignally fitted to a D7F of 93N/94N prefix. As far as I can see there are 2 heights of link - 4.93" (Std.) and 5.23" (extended life).
Do the bushes on your tracks appear to be running correctly on the sprocket teeth, or is there so much wear you can't tell..?

For the carrier rollers there are 2 different Part Numbers available depending on what height of link you're using. This may be your problem.
 

DMiller

Senior Member
Joined
Feb 21, 2010
Messages
16,434
Location
Hermann, Missouri
Occupation
Cheap "old" Geezer
To get your track pitch, measure from pin to pin across 4 links. There is also a chart to tell when you are at maximum wear to links.

Wear Limits - Pins and Bushings
Do not consider for lubricated chains
4 sections of the link assembly
To determ ine the average internal pin w ear m easure across a piece of chain com posing of
4 links (5 pins). The track section, w hich m ust not include the m aster pin, should be on
the upper side of the track and w ell stretched. 75% w ear is recom m endation for pin and
bush turn (noted in green)
Caterpillar | International | Allis - Chalmers | Fiat | Landini - MF | Case | John Deere | Komatsu
Machine Model New Percent Worn Chart
25% 50% 75% 100%
mm in mm in mm in mm in mm in
Caterpillar
935,D2,933C,D3,931 622 24.48 625 24.6 628 24.71 632 24.87 637 25.07
D4,933E,G,955c,941,943 686 27.00 689.5 27.14 693.5 27.31 698 27.48 703 27.67
D6,951,955C,561 686 27.00 690 27.17 694.5 27.34 699 27.51 704 27.71
D5,955K,561C,951C,953 702 27.64 706 27.79 710.5 27.96 716 28.18 722 28.42
D6C,D7,572,977,D8,583,955L,
963
813 32.00 817.5 32.18 822.5 32.37 828 32.59 835 32.87
D7E,F,571,572E,F,977L,973 864 34.01 868.5 34.18 874 34.4 880 34.64 887 34.92
D8H,583H,983 915 36.01 920 36.21 925.5 36.43 932 36.68 939 36.96
D9Super,D9D,E,G,594 1042 41.03 1046.5 41.20 1053 41.45 1060 41.73 1070 42.14
 

DMiller

Senior Member
Joined
Feb 21, 2010
Messages
16,434
Location
Hermann, Missouri
Occupation
Cheap "old" Geezer
Chart did not copy as well as expected, drop down to the 963, just below is the wear numbers in mm first then inches with 813 and 32 being new dimension or 100%. 32.87 or just under 33 inches is full worn out for 8.0 pitch, for the 8.5 pitch the next line with almost 35 inches totally shot.
 

DMiller

Senior Member
Joined
Feb 21, 2010
Messages
16,434
Location
Hermann, Missouri
Occupation
Cheap "old" Geezer
Not all rollers can be trimmed, if they were trimmed once then they won't necessarily take another, need to find a decent used or fairly new or even a new one to get measurements of the diameter of the rolling surfaces, yours may just be due to change, especially if bearings are done. At the outer edge of the rollers look for cutting torch marks, that would be a tattle as to trimmed before.
 

rebible

Member
Joined
Aug 3, 2013
Messages
10
Location
United States
I finally got back to this... If I measure 10 links, I get 87 inches. From the chart that appears almost worn out for 8.5 pitch.. e.g. 0.4 x 87=34.8..
I count 38 links.
This tractor has an Oregon forestry heritage and they were pretty cavalier about swapping parts; if they fit or could be made to fit...
I suspect that the sprockets and tracks were changed at some point??
If someone has a line on 8.5" pitch tracks and idlers that are use-able please drop me a line at robertbible at gmail.com
 

sealark37

Well-Known Member
Joined
Jun 3, 2012
Messages
120
Location
Davidson, NC
Occupation
Retired pilot, old equipment mechanic
You might check with your local Cat Parts and Service Rep. Those guys usually know what is going on in their areas, and will know if there is a set of "farmer" undercarriage laying around. This is hardware removed from a daily use machine that has enough wear left to last a farmer or occasional user for years. Regards, Clark
 
Top