D7-17A hydraulic track adjuster seal replacement.

Here is a step by step/ish guide to replacing the seal inside the track adjuster of my 1955 D7-17A

1, Spit track, move track back to 2nd top roller

2,Move idler forward

3 Move the idler forward enough so the ram is clear of the cylinder. NOTE when prying the ram out of the cylinder remove the grease nipples to save you working against the suction of the cylinder.

4, Remove cylinder.

5, Replace seal.

Do in reverse to reassemble.

TOP TIPs, the cylinder has a chamfer at the opening to assist the ram seal going in, when reassembling leave the cylinder mounting bolts loose that way when you are pushing the ram in you have some extra ''wiggle'' room to help.

When first filling the cyl with grease leave one grease nipple off, then when you fill with grease the air has somewhere to escape rather than being forced passed the seal.

Observations; On this model, for this repair it is not necessary to mess with the spring at all. lt is also not necessary to remove the cylinder to replace the seal. For me it was nessecery to remove the cylinder to inspect it properly, and as suspected a hone.

Got the seal over the counter from Neil at Cariboo Chrome&Hydraulics in Prince George BC phn # 1250 562 0166 for $10


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**No humans where harmed in the making of this documentary**

Good job....
Those are aftermarket track adjusters....well built.....happen to have a NOS set in the basement.

What's all that white stuff!!! LOL

What is that strange looking white soil all over your tractor?
Later Bob

Hi, boys, that white stuff is called “Suitecase Sand.”
Good looking job.
Kelly

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Lol, yep i started the day with that 80s anthem rattling around in my head "Things can only get better''. Safe to say if it was ''Columbian marching powder'', the dozer would probably be a bit of a newer model 😉

thanks so much for the great info. I am new to the site, however I am reading every night to try to get familiar with the old Cat 17a1901 Thanks again the tracks tightened up just fine!

[quote="Old Magnet"]Good job....
Those are aftermarket track adjusters....well built.....happen to have a NOS set in the basement.

What's all that white stuff!!! LOL[/quote]

Yep, the 2 1/2" model....the 3" ones were a little better.