JUPITER - Jupiter 3 Clean and Lube 39mm CLA

Comprehensive clean and lubrication (CLA) guide for the Jupiter-3 39mm focus mount. This service manual provides detailed step-by-step instructions for complete disassembly, cleaning, and reassembly of this classic Soviet lens design. The document covers the five main mechanical components—the 39mm focus mount, inner helical, outer helical with inner sleeve, and focus ring—along with a complete parts breakdown. You'll find precise guidance on removing the optical module safely, disassembling the focus ring assembly, and thoroughly cleaning both helical sections to remove old, dried lubricant without damaging precision surfaces. The manual emphasizes critical techniques such as making scribe marks to preserve original component positions, carefully managing guide pins that control focus travel distance, and maintaining alignment throughout disassembly and reassembly. A dedicated section covers the outer helical assembly cleaning procedure, explaining how to keep the sleeve partially unscrewed to prevent misalignment, removing stubborn grease deposits with appropriate solvents and brushes, and applying fresh lubricating grease in correct quantities for smooth operation. The reassembly section details proper alignment using cam positioning and guide pin reference marks to restore correct rangefinder coupling and ensure optimal focus performance. Optional procedures for securing set screws with lacquer are also included. Essential reading for anyone performing maintenance on Jupiter-3 lenses, whether for hobby restoration or professional workshop use.