Description
Overview:
This Gear Box Assembly is a genuine Stihl service part for selected walk-behind mulching lawn mowers, including the RM 4.0 RT and MB 4.0 RT. It forms the wheel-drive unit that transfers engine power via the drive belt to move the mower forward at a steady pace, helping maintain consistent cutting and mulching performance. Built with a robust cast-alloy housing and steel internal components, it is engineered to cope with repeated use and shock loads from everyday mowing. Use this assembly to replace a worn, noisy, or seized original unit and restore reliable self-propel operation. Supplied as a direct replacement for OEM No. 6383 640 0100, it matches original mounting points for straightforward fitting and correct alignment on compatible models.
Key Features:
- Genuine Stihl part for assured compatibility and durability
- Direct replacement for OEM No. 6383 640 0100 to simplify identification
- Cast-alloy housing with steel internals for long service life
- Closed housing helps protect moving parts from grass, dust, and moisture
- Smooth power transfer to drive wheels for consistent ground speed
- Helps restore self-propel function on machines with slipping or failed drive
- Factory geometry matches original fixings for a clean, bolt-on fit
- Supports efficient mulching by maintaining steady forward motion
- Suitable for regular domestic use and light commercial grounds care
- Designed for the demands of UK mowing conditions, including damp grass
Typical Applications:
Replacement of the wheel-drive unit on Stihl mulching mowers where the drive has become noisy, sluggish, or inoperative. Common during overhaul or seasonal maintenance for gardeners, landscapers, grounds teams, and homeowners who need reliable self-propel performance on varied lawns, inclines, and longer grass.
Also known as:
Self-propel drive box, wheel drive unit, reduction drive assembly, propulsion drive, final drive, mower drive module, drive mechanism, power drive assembly.
Fits Models:
MB 4.0 RT
MB4.0RT
MB40RT
RM 4.0 RT
RM4.0RT
RM40RT
Alternate Part Numbers:
6383-640-0100, 63836400100
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