Professional Gear Box: engineered metal gearhead with spur sprocket design for HT73 HT75 HT100 HT130 HT131 HT250 KM110 KM130 KM90 FS85 branch pruning saws, ensuring efficient power transmission from motor to cutting blades. Complete Maintenance Kit: includes one quality gear box and two disassembly tools, enabling quick and easy maintenance without requiring professional assistance. Compatible With Multiple Models: replacement gearbox is fully compatible with replacement numbers 4182 200 0070 and 4138 205 0008, making it a versatile addition to your tree trimming equipment collection. Easy Installation Design: the direct installation design lets you quickly old or damaged gearheads, saving valuable time and effort during maintenance or repairs. Key Benefits: provides reliable power transfer to maintain cutting performance, reduces downtime, supports doityourself maintenance, and offers crossmodel compatibility for a range of pruning saws. Practical Use Scenarios: Scenario 1: During seasonal pruning with HT75, a worn gear head to restore consistent cutting speed and efficiency. Scenario 2: In a busy landscaping workflow, upgrade KM110 to improve reliability and minimize downtime between jobs. Scenario 3: Perform routine maintenance on FS85 to prevent motor overload and blade stalls, keeping the saw ready for peak season.