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- Compatibility: Compatible with Komatsu PC100 PC200 PC300 PC400 excavators for accurate fit and reliable track tension service. - OE Match: Built to replace OEM 07959-20001; confirm the code, thread, and seat against your parts catalog before installation. - Function: Seals and releases grease to adjust track sag, maintains adjuster pressure, and helps prevent track derailment during digging, grading, and travel. - Construction: Machined steel body with plated surface; compact profile fits the idler housing and holds pressure consistently in routine operations. - Service Use: Works with a standard grease gun to add or bleed grease; suitable for construction sites, rental fleets, and workshops; supports regular undercarriage inspections.