727 Help Please

Illahe said

Thank you Kim. The V/B was sent back to Turbo Action for inspection. And a pump in better condition was sourced. looking at the 727 rebuild book I'm unable to locate an end play measurement for the planetary stack. Is there a spec that should be inspected, before the unit is reassembled? The flow diagram seems to indicate that the output shaft is charged through the front planetary and through the governor valve. Don't want to miss anything.

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The rebuild book should provide geartrain end play spec. Gear train end play is the distance between the front planetary and the snap ring on the output shaft, which holds the geartrain in place on the output shaft. I use .015-.018 spec for thrust washer geartrain. For Torrington bearing geartrain I use .010-.015. But again, reference your book. The snap ring is selective to adjust gear train end play.

The front pump to drum end play is also a selective washer, which I would tighten up from .060. As long as you are measuring end play with a dial indicator and weight on the output shaft, or ensuring the output shaft is being held stationary. If you are checking pump to drum end play without the output shaft being held stationary, you are actually measuring “free play” which is different. So how you are checking and measuring end play is very important.