TM 55-1520-240-23-45-1ROTARY-WING HEAD AND CONTROLS(Continued)5-1LUBRICATION SYSTEMA single hub oil tank lubricates the horizontal pinbearings. Each pitch-varying housing has a pitchbearing oil tank and two vertical pin bearing oil tanks.The vertical pin tanks are connected to each other by anoil manifold tube. Sight indicators are provided for eachtank, to check oil level. The swashplate is lubricatedwith grease.SELF-RETAINING BOLTSBolts connecting upper controls and shock absorbersare the positive-retention or impedance types. Thesebolts have a pawl or lock ring to keep the bolt in place,even with the nut removed. Bolts are installed with boltheads facing the direction of rotation (Task 1-14).END OF TASK5-6
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