rc454 Posted April 1, 2021 Report Share Posted April 1, 2021 (edited) Note about step g. in the gear rigging procedure described in my service manual for the M20C (manual gear). This is not from Mooney - it is just a note I added to my own service manual to clarify the bad (incomplete) wording found there. The purpose of step g. is to apply a preload to each of the three landing gear. The in the manual is confusing because it is incomplete. It should read as follows: By turning tubes, shorten the nose gear retraction tubes 2 turns and lengthen the main gear retraction tubes 2 - 2 1/2 turns. Then tighten check nuts... Explanation: The retraction bars we are adjusting are identified as bars B-A for the nose gear and bars B-E for the mains. Since the nose gear is moved into the down position by pulling on the retraction bars B-A, shortening those bars increases the preload in the down/locked position. Conversely, since the main gears are moved into the down position by pushing on the retraction bars B-E, lengthening those bars increases the preload in the down/locked position.) Edited April 1, 2021 by rc454 1 Quote Link to comment Share on other sites More sharing options...
carusoam Posted April 1, 2021 Report Share Posted April 1, 2021 rc, Thanks for taking the time to write and share all that detail! Best regards, -a- Quote Link to comment Share on other sites More sharing options...
Mooneymite Posted April 1, 2021 Report Share Posted April 1, 2021 Checking the pre-load is almost an art. Have three different people check a pre-load and chances are you'll get three different readings on the mains (and the nose on the manual gear Mooneys). "First movement" can be a very subjective criterion. Always take several readings. I've found that an electronic torque wrench that records highest reading is better than the dial type torque wrench specified in the MM. 1 Quote Link to comment Share on other sites More sharing options...
Shiny moose Posted April 1, 2021 Report Share Posted April 1, 2021 Clean and lube first!!! Quote Link to comment Share on other sites More sharing options...
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