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D7RII track repair

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ianjoub

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Jun 22, 2018
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Homosassa, FL USA
I spit a track off of my dozer. Of course it is in a bad spot. I started on the repair today. This is looking like a big project, especially working alone. I have new chains, sprocket segments, idlers, and rollers (bogies). I will need to inspect the track adjuster frame and parts when I have it apart to see if anything is damaged or just hyperextended.

I got out about 20 of the 344 track shoe bolts.



Earthquake my a$$.


20220919_163050.jpg 20220919_163217.jpg 20220919_163122.jpg
It was working, but only when the compressor was above 130 psi. I lot of waiting between ugga duggas.
 
I

ianjoub

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20220920_145032.jpg 20220920_145145.jpg 20220920_145014.jpg Did 4.5 hrs today. It was probably 2.5 hrs of work and 2 hrs of watching the sweat drip out of my clothes.

I am still buried deep in the ho

I got enough track pads off to offset the track chain to the side. I am hoping to get the track adjuster frame out, reset the adjuster, and reinstall. If I can, I will get the track back on and move the dozer to flat ground to finish the rest of the job.

You can see the adjuster hyperextended... the black seal is showing and the whole thing is offset.
 
1693TA

1693TA

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Feb 27, 2010
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Farmington IL
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FAA Radar Engineer, (Retired)
A larger air line to feed that impact wrench would serve you better. I use 3/4" air line on mine and it doesn't have any trouble breaking truck lugs, or track bolts loose, or snap them off. My wrench is a 40+ year old CP however.
 
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ianjoub

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Joined
Jun 22, 2018
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1,464
Location
Homosassa, FL USA
1693TA said:
A larger air line to feed that impact wrench would serve you better. I use 3/4" air line on mine and it doesn't have any trouble breaking truck lugs, or track bolts loose, or snap them off. My wrench is a 40+ year old CP however.
Click to expand...
The hole in the compressor tank is a 3/8", the 1/2" hose isn't the restriction.
 
1693TA

1693TA

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Farmington IL
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FAA Radar Engineer, (Retired)
Drill and tap that bung plug to 1" NPT, (where your current air hose is connected) and bush it down to 3/4" NPT. Into this bushing install a 3/4" close nipple and a 3/4x3/4x3/4 Tee and bush one of the openings of the Tee to either 3/8" NPT, or 1/4" NPT and install an air coupler. The other opening of the Tee gets either a 1/2" or 3/4" air coupler.

That 60gl upright compressor doesn't make air really fast, but it will work if allowing air to replenish. However the less restricted airflow will work in your favor.
 
John C.

John C.

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Jun 11, 2007
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Northwest
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Machinery & Equipment Appraiser
One inch gun = one inch air hose.
One inch gun on half inch hose = less than half the rated amount of torque the gun is designed to put out. You get one or two good hits and the line pressure drops nearly instantly.

You didn't need to pull the pads to put the track back on and then move the machine to flat ground.
 
I

ianjoub

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Joined
Jun 22, 2018
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1,464
Location
Homosassa, FL USA
The tensioner looked fine. There is a little something on the what should be polished shaft. A little emory cloth got it smooth again.

20220921_113808.jpg 20220921_113822.jpg
 
I

ianjoub

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Jun 22, 2018
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Location
Homosassa, FL USA
Thankfully the 4 snapped off bolts came out easily. I was able to do it with my fingers. There is a little gouging on parts of this piece. I'll clean it up with a grinder and some files. I think it will be fine.

20220921_113913.jpg


The seal is trashed, but everything inside looked fine

20220921_113920.jpg
 
I

ianjoub

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Joined
Jun 22, 2018
Messages
1,464
Location
Homosassa, FL USA
These pieces look a little distorted. I will order new ones and compare. I'll replace if necessary. One concern, the 4 bolts that go through here were snapped off, but I found 5 broken bolt heads in the bottom of the receiver part of the frame. I couldn't see anywhere the 5th one could have come from. I was thinking this happened before and the last guy didn't remove all the carnage?

20220921_113814.jpg
 
E

epirbalex

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Joined
Aug 5, 2017
Messages
554
Location
Akitio
Occupation
peasant
ianjoub said:
I spit a track off of my dozer. Of course it is in a bad spot. I started on the repair today. This is looking like a big project, especially working alone. I have new chains, sprocket segments, idlers, and rollers (bogies). I will need to inspect the track adjuster frame and parts when I have it apart to see if anything is damaged or just hyperextended.

I got out about 20 of the 344 track shoe bolts.



Earthquake my a$$.


View attachment 268462 View attachment 268463 View attachment 268464
It was working, but only when the compressor was above 130 psi. I lot of waiting between ugga duggas.
Click to expand...
You could purchase a torque multiplier to crack the track bolts . Inexpensive compared to a set of bolts and the gas to cut them . Once cracked with the multiplier the air you have may be enough to keep up with you
 
I

ianjoub

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Joined
Jun 22, 2018
Messages
1,464
Location
Homosassa, FL USA
So, these 'retainers' have a nice bend in them, could have been a little distorted. I ordered new ones. Apparently those bends are THEY ARE BENT. It looked almost like they were made that way, but the new ones are perfectly flat. I am glad I ordered the new ones.
20220921_113814-jpg.268646
 
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