Products Description
MS170 / MS180 Chainsaw Clutch Drum Set
Complete Clutch Drum Assembly for STIHL 017, 018, MS170, MS180
This clutch drum set is a complete replacement assembly for STIHL 017, 018, MS170, MS180, and compatible models including MS210, MS230, MS250, 021, 023, and 025 . The kit includes the clutch drum, sprocket rim, needle bearing, retaining clip, washer, clutch assembly, oil pump worm gear, and spark plug . Designed to replace OEM part numbers 1123 640 2074, 1123 640 2003, and 1123 007 1032 .
Technical Profiles & Materials
Complete All-in-One Kit – Includes clutch drum, sprocket rim, needle bearing, clutch assembly, retaining clip, washer, oil pump worm gear, and spark plug. All components needed for full clutch and drive system restoration .
Dual Pitch Options Available – Choose between .325″ × 7-tooth rim sprocket or 3/8″ × 7-tooth spur sprocket . Selection depends on your chainsaw's chain type.
OEM Compatibility – Replaces STIHL part numbers 1123 640 2074, 1123 640 2003, 1123 640 2073, 1123 160 2001, 1123 640 7102, 1123 007 1032, and 1123 007 1003 .
Durable Metal Construction – Manufactured from high-hardness metal with good resistance and durability, capable of withstanding demanding cutting conditions .
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | Compatible Models | STIHL 017, 018, MS170, MS171, MS180, MS181, 021, 023, 025, MS210, MS211, MS230, MS250, MS251 |
| 2 | Sprocket Options | .325″ × 7T Rim OR 3/8″ × 7T Spur |
| 3 | OEM Sprocket References | 1123 640 2074 (.325″), 1123 640 2003 / 1123 640 2073 (3/8″ LP) |
| 4 | OEM Clutch Reference | 1123 160 2001 |
| 5 | OEM Worm Gear | 1123 640 7102 |
| 6 | OEM Drum/Bearing Ref | 1123 007 1032, 1123 007 1003, 9512 933 2260 |
| 7 | Kit Contents | Clutch drum, sprocket, clutch, needle bearing, retaining clip, washer, worm gear, spark plug |
| 8 | Material | High-hardness metal |
| 9 | Weight | Approx. 270g |
Products Application
Clutch & Drive System Overhaul
When the chain drive becomes inconsistent, clutch slips, or sprocket teeth show wear, this kit provides all necessary components for a full restoration. Replacing the complete assembly ensures all wear-prone parts are renewed simultaneously, preventing premature failure of new components .
Replacement for Damaged Components
Direct replacement for worn or broken clutch drums, sprockets, bearings, and worm gears on MS170/MS180 and compatible STIHL saws. The included oil pump worm gear is essential for proper chain lubrication .
Preventative Maintenance
Sprocket wear can be difficult to see but causes poor chain engagement and power loss. Replacing the complete clutch drum assembly as a set ensures consistent cutting performance and extends chainsaw service life .
Quality and Craftsmanship Details
Products Package
About Us
As a premier garden machinery parts supplier, Jiaxing Norsun Trading Co., Ltd. bridges global distributors with over 100 vetted China manufacturers. We streamline your B2B supply chain through strict quality control, flexible production, and factory-direct wholesale pricing. Partner with us for reliable, high-volume sourcing of precision-engineered outdoor power equipment components.
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FAQ
Q: How do I confirm which pitch set I need?
A:Check your chainsaw's existing chain specification. The chain packaging or bar will indicate pitch (.325″ or 3/8″). If using a .325″ chain, select the .325″ × 7T set. If using 3/8″ PICCO chain, select the 3/8″ × 7T set. The two systems are NOT interchangeable .
Q: What's included in a complete clutch drum kit?
A: Typical kits include: clutch drum, sprocket rim, clutch assembly, needle bearing, retaining clip, washer, oil pump worm gear, and spark plug . Some kits may omit the clutch assembly, so verify contents before ordering.
Q: What are the OEM part numbers this kit replaces?
A: Depending on configuration, this kit replaces: 1123 640 2074, 1123 640 2003, 1123 640 2073, 1123 160 2001, 1123 640 7102, 1123 007 1032, 1123 007 1003, and 9512 933 2260 .
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