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100040 | L1.0809-55 Hydraulic Tank Breather
Heavy-Duty Air Compensation Cap for Sennebogen, Liebherr & John Deere | High-Impact Polymer Shell | M42x2 Precision Threaded Protection
Dynamic Pressure Balancing & Anti-Emulsification Technology
The AYREST 100040 (L1.0809-55) Breather is not merely a dust cap; it is a critical pressure-balancing component engineered for high-cycle hydraulic systems found in forestry, material handling, and heavy earthmoving equipment. As hydraulic fluid levels fluctuate during cylinder extension and retraction, this breather facilitates instant air compensation, ensuring the tank maintains an optimal internal atmosphere without collapsing or over-pressurizing.
Constructed from high-impact engineering polymer, the shell is specifically designed to resist the harsh environmental stressors of logging sites and scrap yards-including flying debris, UV degradation, and chemical exposure. Inside, the breather utilizes advanced dense media that provides effective air pre-filtration. Its core mission is to block atmospheric moisture from entering the reservoir, a vital function that prevents oil emulsification and safeguards the chemical stability of expensive hydraulic fluids.
Featuring a knurled anti-slip design for easy manual installation, the M42x2 precision thread provides a rock-solid, leak-proof connection even in high-vibration applications like the Liebherr Litronic series or Eco Log harvesters. By maintaining a clean and balanced "breathing" cycle for your reservoir, this component significantly reduces the wear on sensitive hydraulic pumps and valves, making it a low-cost, high-return insurance policy for your machinery's uptime.
Structural Specifications
| Technical Parameters | Details & Standards |
|---|---|
| Part Number | 100040 / L1.0809-55 |
| Thread Size | M 42 x 2 (ca. 41mm) |
| Overall Height | 70.0 mm |
| Outer Diameter | 80.0 mm |
| Material | Reinforced High-Impact Polymer |
| Function | Atmospheric Air Compensation & Pre-Filtration |
| Weight Net | 0.14 kg |
OE Cross-Reference & Equivalents
Verified Machine Applications
Sennebogen (Material Handling & Cranes):
2200E, 305, 310, 673E, 818D, 821F, 825D, 830D/M Series, 835D, 840D M/R, 850D, 860D.
Liebherr (Compact & Litronic Series):
A314, 904C, L504 Gen8, L506 Speeder, L507 Stereo Gen6, L508, L509, L510, L514, L518, R954C, T41‑7s.
John Deere (Compact Wheel Loaders):
244P, 324P, 344P Series.
Eco Log (Forestry): 574D Harvester/Forwarder.
Agricultural (Kuhn): EP6183, TP2002H, E5551SP Plows & Spreaders.
Construction (Eurocomach): ESK190 Skid Steer, ETL200.4 Track Loader.
Expert Technical FAQ
Q1: Why is air compensation necessary for a hydraulic tank?
A: When a hydraulic cylinder extends, it draws fluid from the tank, creating a vacuum. If the breather is blocked or non-functional, the vacuum can cause pump cavitation or even structural deformation of the tank. The 100040 ensures a seamless "breathing" cycle to maintain atmospheric balance.
Q2: How does this breather help prevent oil emulsification?
A: Atmospheric air contains humidity. The internal media of the L1.0809-55 acts as a moisture barrier. By reducing the volume of water vapor that enters the tank during inhalation, it significantly lowers the risk of water mixing with oil (emulsification), which would otherwise reduce lubrication quality.
Q3: Is the polymer shell durable enough for forestry applications?
A: Yes. The material is a reinforced engineering-grade polymer designed specifically for the extreme vibrations and debris impact common in Eco Log and Sennebogen operations. It is rust-proof and resistant to hydraulic fluids and common solvents.
Q4: What is the significance of the M42x2 thread?
A: This is a standard industrial large-format thread. It provides a much larger surface area for sealing compared to bayonet-style caps, ensuring that even in pressurized or high-dust environments, the tank remains perfectly sealed at the connection point.
Q5: When should I replace the breather cap?
A: While often overlooked, we recommend replacement every 500-1000 operating hours, or sooner if operating in high-dust environments (like scrap metal handling) to ensure the air compensation path remains 100% unobstructed.
Protect Your Hydraulic Reservoir Integrity
Direct wholesale supply for global fleets. Bulk inventory available for fast export.
*Verified OEM Dimensional Matching | High-Impact Materials | Rapid Global Delivery*
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