Rexroth Mecman 334 018 001 2 Repair Kit

Rexroth Mecman 334 018 001 2 Pneumatic Shuttle Valve Repair Kit

The Rexroth Mecman 334 018 001 2 (Material Number: 3340180012) is an OEM factory spare parts repair kit (Ersatzteil) engineered for the overhaul and maintenance of Bosch Rexroth / Mecman marine pneumatic shuttle valves (OR-logic direction valves). Designed to withstand continuous cyclical duty in harsh maritime and heavy-duty industrial automation environments, this genuine seal kit restores valve switching response, prevents internal bypass leakage, and ensures pressure retention across marine propulsion control circuits.

Manufactured in Germany from high-grade synthetic elastomers and precision-formed internal sealing elements, this kit directly services the valve core, eliminating downtime caused by degraded diaphragms and hardened O-rings exposed to heat, oil vapor, and compressed air contaminants.

Model Details

• Manufacturer: Bosch Rexroth
• Manufacturer Part Number (MPN): 334 018 001 2
• Alternative Part Formats: 3340180012, 334-018-001-2, 334.018.001.2
• Component Type: Pneumatic Shuttle Valve Overhaul & Seal Kit (Ersatzteil Dichtsatz)
• Country of Origin: Germany

Key Features

1. Genuine OEM Precision: Manufactured to tight OEM tolerances to guarantee zero blow-by and instant logic switching under low and high pilot pressures.
2. Hydrocarbon-Resistant Elastomers: Specially formulated NBR/FKM diaphragms resistant to mineral-based compressor lubricants, moisture, and synthetic pneumatic oils.
3. Drop-In Serviceability: Exact-fit replacement components designed for field maintenance without requiring body machining or pipe disconnection.
4. Extended Marine Cycle Life: Rated for severe offshore duty cycles, anti-vibration resilience, and fluctuating engine room temperatures (0°C to +70°C).
5. Complete Seal Integrity: Includes primary sealing diaphragms, internal guide O-rings, and retainers necessary for a complete valve rebuild.

Industrial & Marine Applications

• Main Propulsion Engine Remote Controls: Pneumatic logic circuitry for MAN B&W, WinGD (Sulzer), and Daihatsu marine main engine maneuvering desks and bridge telegraphs.
• Marine Gearbox & Clutch Actuation: Dual-station logic selection and emergency command override systems for reduction gears.
• Deck Machinery & Winch Controls: Pneumatic brake interlocks and dual-station control valves for mooring and anchor windlass assemblies.
• Industrial Automation & Process Plants: High-cycling pneumatic transfer lines, double-acting cylinder sequencing, and emergency pilot safety bypasses.

Compatible Valve Assemblies

• Rexroth / Mecman / Aventics Shuttle Valve: 334 018 100 0 (3340181000)
• Rexroth Shuttle Valve Series: 334 018 000 0 (3340180000) series
• Dual-Inlet Logic Switching Blocks: Standard ND 6 to ND 10 shuttle valve bodies using modular sub-base and in-line BSP/NPT/Metric porting.

Cross-Reference Part Numbers

• Bosch Rexroth: 334 018 001 2 / 3340180012
• Mecman: 334-018-001-2
• Aventics / Emerson Automation: R45523-005022 / 3340180012

Overhaul Procedure

• Pneumatic Isolation: Depressurize the air manifold completely and lockout supply line pressure before disassembling the 334 018 100 0 valve body.
• Housing Inspection: Remove the end covers and extract worn diaphragm seals. Inspect the internal aluminum valve chamber for scoring or moisture corrosion. Clean thoroughly using an oil-free pneumatic solvent.
• Seat Verification: Ensure the internal metallic shuttle sealing face is flat and free of debris. Any pitting on the metal seat will cause continuous exhaust leakage even with new diaphragms.
• Lubrication: Apply a micro-thin layer of silicone or lithium-free pneumatic grease (such as Klüber or Rexroth special grease) to O-rings. Avoid excessive grease, which can cause sticking in low pilot pressure logic circuits.
• Torque Specifications: Fasten body screws evenly in a cross-diagonal sequence to avoid pinching the diaphragm edges.

Frequently Asked Questions

What is the function of the Rexroth Mecman 334 018 001 2 spare part kit?

This kit contains the internal dynamic diaphragms and static O-ring seals required to rebuild Rexroth Mecman shuttle valves (such as model 334 018 100 0). It restores dual-source logic direction switching and stops internal air leakage between inlet ports.

How do I know if my shuttle valve needs a seal kit replacement?

Common symptoms include slow response times in propulsion remote controls, air backfeeding into the secondary inlet line, failure to hold pressure at the outlet port, and continuous air venting around valve body joints.

Is this kit interchangeable with newer Aventics / Emerson parts?

Yes. Bosch Rexroth’s pneumatic division transitioned to Aventics (now part of Emerson). The part numbers 334 018 001 2 and 3340180012 are dimensionally and functionally identical across Rexroth, Mecman, and Aventics branding.

Can this repair kit be used in offshore marine engine rooms?

Yes. The elastomeric seals are rated for heavy marine environments, providing high resistance to compressor carryover oil, vibration, and thermal fluctuations commonly found in ship engine rooms and cargo control stations.