Replacement Oil Pump 581339101 — Compatible with McCulloch, MTD, Partner and TroyBilt Chainsaws Keep your chainsaw properly lubricated and running smoothly with this replacement oil pump (part number 581339101). Designed to restore reliable bar and chain oil delivery for a wide range of McCulloch, MTD, Partner and TroyBilt models, this pump helps prevent premature wear and supports consistent cutting performance. Key benefits Restores proper bar and chain lubrication so the chain runs cooler and lasts longer. Resolves common oiling problems such as low or inconsistent oil flow and oil leaks. Directfit replacement for the listed models, making repairs fast and straightforward. Helps maintain cutting performance and reduce maintenance costs by protecting the bar, chain, and sprocket. What it does Delivers oil from the reservoir to the bar and chain during operation. Replaces worn, clogged, or damaged pumps to reestablish correct oil flow rates. Works as part of routine or maintenance to ensure reliable lubrication under load. Compatibility (fits these models) McCulloch: CS35, EB356, EB358A, EBC1640BK, MCC1435A, MS354, MS4016PACC, PMC1840BKX MTD: 1435A, 1640NAVCC, MS40, MX40 Partner: P340S, P350S, P360S TroyBilt: TB3516CC Key attributes Part number: 581339101 — match this number to your existing pump before . Function: Bar and chain oil pump for chainsaw lubrication systems. Compatibility: Fits the exact models listed above; intended as a direct replacement. Performance: Restores consistent oil flow for effective lubrication during cutting. Installation: Designed as a directfit replacement; usually installed with basic hand tools. Refer to your specific model service manual for torque values and precise procedures. Use cases / applications after oil pump failure: a nonpumping or poorly pumping unit to restore lubrication and prevent chain overheating or rapid wear. Fix inconsistent oiling: a worn or clogged pump to eliminate uneven oil distribution that causes dry spots on the bar and chain. Preventive maintenance before heavy use: Swap in a pump when preparing the saw for extended jobs or seasonal work to ensure reliable lubrication throughout the project. Installation notes and tips Verify part number 581339101 and model compatibility before installation. Follow the chainsaw manufacturer's disassembly and reassembly instructions; consult the service manual for your specific model. Clean the oil reservoir and feed passages before fitting the pump to avoid recontamination. Check oil flow after installation by running the saw and observing oil spit on a clean surface or by following the manufacturer's test procedure. this replacement oil pump if your chainsaw on the compatibility list is experiencing low or no oil delivery, oil leaks around the pump area, or accelerated chain and bar wear. Restoring reliable lubrication extends component life and supports consistent cutting performance.