D7D 17A right steering clutch lever stuck booster piston in.

Try prying it back at the steering clutch yoke adjustment after removing the access cover.

Thanks.. on my way to try that now.

Hi OM

is there any chance of posting some more detail/information about the booster unit, eg., how it works?

I have one that behaves somewhat erratically. It often does not work at all, then begins to work after some running time. I have checked the oil and it seems okay. Next check is the filter unit ...when the weather improves a bit. Maybe the pistons are sticking too.

There's not much in the Cat books I have about the unit.

Was there another booklet specifically for the booster unit?

Also, can it be removed, eg., to check the seals which I presume sit somewhere underneath without major rear end surgery?

Thanks in anticipation😊

The booster used on the 6's,7's and 8's are all pretty much alike. Coverage of operation is better in the later service manuals. I particularly like the detailed 7 page section in the 37A and 44A service manual for the D6B. About the only thing that goes out on them are the seals and the self contained hydraulic pump. They default to manual override when the boost feature fails.

The self contained unit sits on top of the steering clutch case and is fairly easy to remove to the bench once the fuel tank is removed.

If you get to searching the BB archives there is some misinformation on removing the push rod seals. The drilling of retainer pins is not necessary.

thanks OM will try removing it

Key to removal is to lift it straight up otherwise it tends to bind on the stub shafts coming up out of the steering clutch case. Lift point is the center forward bolt of the top cover.

OM...:whoo: the prying, greasing and kroil seemed to do the trick. 17A13356 comes to its new home tomorrow! Thanks for the help.

Glad to hear that worked out. Where is home?

Home is central New York, other than getting use to so many levers to work in a tight road building project (heavy woods), I think that I am getting the hang of it. Cutting a grade down a steep hill traverse while dozing stumps is quite interesting. Runs like a champ but does seem to have a heavy vibration when I bring the rpms up a bit.