ZF 3307199002 - Seal, Gasket & Clutch Overhaul Kit for HBW 20/250, ZF 25M/25MA Gearboxes

ZF 3307199002 - Seal, Gasket & Clutch Overhaul Kit for HBW 20/250, ZF 25M/25MA Gearboxes

The ZF 3307199002 Seal, Gasket & Clutch Kit is a complete OEM-grade overhaul solution for Hurth HBW 20/250 and ZF 25M/25MA marine gearboxes. It contains all critical components required for a full transmission rebuild, including sealing rings, gaskets, clutch discs, washers, and a wide range of shims for precise alignment and performance tuning. This kit is essential for restoring gear engagement smoothness, preventing oil leaks, and extending gearbox service life under demanding marine conditions.

Key Features:

• Designed for Hurth HBW 20/250 and ZF 25M/25MA marine transmissions
• Complete kit: seals, gaskets, inner/outer clutch discs, washers, springs, and shims
• Includes 8 outer and 10 inner clutch discs for complete clutch pack replacement
• Multiple shim thicknesses (0.30 / 0.40 / 0.50 mm) for precise gearbox calibration
• Corrosion- and oil-resistant components for marine durability
• Reduces vibration, prevents leakage, and improves transmission reliability
• Suitable for both preventative maintenance and full gearbox overhauls
• Easy installation with exact-fit OEM components

Specifications:

Kit Contents:

• 1 × Shift cover sealing ring (0634 502 009)
• 2 × Drain plug/oil dipstick sealing rings (3306 301 016)
• 4 × Cover gaskets (3307 301 011)
• 1 × Shifting cover gasket (3306 301 015)
• 1 × Input shaft sealing ring (0634 301 832)
• 1 × Output shaft sealing ring (0634 300 466)
• 2 × Bearing/gear thrust washers (3307 304 022)
• 8 × Outer clutch discs (3307 304 005)
• 10 × Inner clutch discs (3307 304 021)
• 3 × Disc carrier springs (3306 304 024)
• 4 × Output shaft keys (3307 304 004)
• 2 × Clutch pack shims – 0.30mm (3306 304 034)
• 2 × Clutch pack shims – 0.40mm (3306 304 035)
• 2 × Clutch pack shims – 0.50mm (3306 304 036)
• 2 × Input/output shaft shims – 0.10mm (3307 302 006)
• 2 × Input/output shaft shims – 0.15mm (3307 302 007)
• 2 × Input/output shaft shims – 0.20mm (3307 302 008)

Benefits:

• Ensures long-lasting gearbox sealing and performance
• Restores full clutch pack functionality and shifting response
• Reduces the risk of oil leaks and vibration
• Minimizes downtime by providing all necessary components in one kit
• OEM-quality components with perfect fitment
• Ideal for both routine maintenance and full transmission rebuilds
• Protects internal parts from corrosion and mechanical wear
• Compatible with both commercial and recreational marine vessels