Durable gearbox gear head for longlasting performance Built with rugged metal construction to ensure smooth power transmission and reliable operation in demanding outdoor conditions. Designed for efficient branch pruning, reducing wear and extending service life. Easy installation and broad compatibility Direct replacement for models HT73, HT75, HT100, HT130, HT131, HT250, KM90, KM110, KM130, FS85. Replacement numbers 4182 200 0070 and 4138 205 0008. Includes 2 disassembly tools for quick setup without professional help. Spur sprocket design for efficient power transfer Features a 3/86T spur sprocket mechanism that transfers power from the motor to the cutting action, delivering cleaner cuts on branches and leaves while minimizing operational strain and improving pruning results. Heavyduty construction and reliability Crafted from longlasting metal materials to withstand heavyduty use in lawn mower parts and branch pruning machines, ensuring consistent performance over extended periods without frequent replacements. Use scenarios Scenario 1: Replacing a worn gearbox on HTseries pruning saws during seasonal tallbranch pruning to restore smooth operation and reduce downtime. Scenario 2: Landscaping crews upgrading KM or FS models for routine maintenance, maintaining reliable pruning performance in parks or large properties. Scenario 3: Professional tree care tasks requiring a direct replacement to achieve cleaner cuts and lower operator fatigue in challenging outdoor work.