Products Description
MS070 Chainsaw Needle Bearing
Precision Needle Bearing for STIHL 070, 090 & MS720 Professional Saws
The needle bearing is a critical component in the clutch and drive system of the STIHL MS070, 090, and MS720 chainsaws. This bearing sits between the clutch drum and the crankshaft, reducing friction and enabling smooth rotation of the clutch drum during chain engagement. The large-displacement 105cc engine platform generates significant torque and vibration, making a high-quality, precisely engineered needle bearing essential for reliable operation and extended service life. Replacement bearings are available in both genuine OEM and quality aftermarket options.
Technical Profiles & Materials
Precision Needle Roller Design – The bearing contains precision-ground needle rollers that support smooth rotation of the clutch drum on the crankshaft stub, reducing friction and wear in the clutch assembly. Multiple OEM and aftermarket variants are available in different dimensions to suit specific applications .
Multiple Dimension Variants – MS070 saws may use different needle bearing sizes depending on the specific model variant. Available configurations include:
15x18x20mm – Replaces OEM 9512 933 4050
15x19x19.5mm – Replaces OEM 9512 003 4080
15x18x22mm – Available in complete clutch drum and sprocket kits
Durable Steel Construction – Manufactured from hardened bearing steel with precision-ground rollers for wear resistance and long service life under continuous high-load, high-RPM conditions. Aftermarket options from ISO-certified manufacturers offer reliable performance at competitive prices .
Technical Specifications
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Products Application
Clutch Assembly Overhaul
The needle bearing is a standard wear component that should be inspected and replaced when servicing the clutch drum or drive sprocket. A worn bearing can cause clutch drum binding, chain movement at idle, or poor power transfer. Replacing the bearing together with the clutch drum ensures all drive components are renewed simultaneously .
Excessive Crankshaft Play Diagnosis
If the MS070 exhibits excessive crankshaft lateral or axial play, the needle bearing and associated circlip washers should be inspected. The workshop manual specifies that additional washers may be required between the circlip and bearing to address play issues .
Preventative Maintenance
For professional arborists and forestry workers using MS070/MS090 saws, replacing the clutch needle bearing during scheduled maintenance prevents field failures. The bearing must be lubricated with proper alignment of the oil hole to the crankcase port for optimal oil flow to the needle rollers . Genuine OEM and quality aftermarket bearings are available from multiple suppliers .
Quality and Craftsmanship Details
Products Package
About Us
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FAQ
Q: How do I confirm which needle bearing fits my MS070?
A:Check your chainsaw model number and the dimensions of your existing bearing. MS070 models may use either 15x18x20mm (OEM 9512 933 4050) or 15x19x19.5mm (OEM 9512 003 4080) depending on the specific variant. For clutch drum and sprocket kits, the needle cage may be 15x18x22mm . Verify your existing bearing dimensions before ordering.
Q: What are the symptoms of a worn needle bearing?
A: Symptoms include noise from the clutch area, clutch drum binding, chain running at idle (clutch not disengaging), or poor power transfer during cutting. A worn bearing can also contribute to excessive crankshaft play, leading to lateral and axial movement that affects clutch engagement .
Q: How should the needle bearing be installed?
A: The race must be pressed into the clutch drum or crankcase with the oil hole aligned at the top with the crankcase lower port oiling hole. This alignment ensures the machined groove around the outer edge of the race fills with oil like a reservoir, providing a direct flow to the needle rollers. Proper alignment is critical for bearing lubrication and long service life .
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