Clamshell grabs are essential for material handling in biomass storage and processing yards. However, when dealing with wet biomass or biomass with high corrosive content, equipment wear and damage can accelerate significantly if proper preventive maintenance is not applied. For this reason, the Stemm team shares key recommendations to extend the service life of Clamshell grabs and enhance operational efficiency in demanding environments.
Clamshell Grabs and Their Maintenance in Biomass Yards
Biomass, especially when wet or containing natural chemical agents like organic acids, presents a challenge for the mechanical components of Clamshell grabs. Moisture can penetrate shafts, cylinders, and hydraulic systems, causing oxidation or affecting lubrication, while fibrous residues can accumulate in joints and friction points, accelerating wear.
Therefore, it is essential to adopt a preventive maintenance approach that includes:
- Frequent Lubrication: Use water, and heat-resistant lubricants to protect articulation points and bearings. Under severe conditions, inspect and apply lubricant every 8 to 12 hours of operation is recommended.
- Regular Inspections: Check the condition of seals, pins, bushings, and welds. Early detection of cracks, excessive play, or corrosion helps prevent major failures.
Proper Storage: When not used, the grab should be stored on firm surfaces in a closed position to avoid water or plant residue accumulation. Ideally, it should be stored under a roof or with a waterproof cover.
Signs of Potential Issues in Clamshell Grabs When Handling Biomass
Intensive use of Clamshell grabs in wet and harsh environments, such as those associated with biomass handling, can accelerate component wear and cause failures that compromise equipment performance. Being alert to certain warning signs is key to preventing more serious problems.
Common signs include hydraulic cylinder leaks or pressure loss, which may indicate seal deterioration or a problem in the hydraulic system. It's also important to pay attention to metallic noises or irregular movement when opening or closing the grab, as these symptoms are often related to worn pins, bushings, or alignment issues.
Visible accumulation of material between the teeth or along the joints can hinder proper closing and reduce operational efficiency. Similarly, premature rusting in critical areas indicates that surface protection is failing, potentially leading to structural damage if not addressed in time.
Detecting these symptoms early allows for corrective action before unplanned downtime or costly repairs are required, helping to maintain safe, efficient, and continuous operation.
Issues That Arise from Neglecting Preventive Maintenance
Ignoring preventive maintenance can directly impact operations and profitability. Some of the most common problems include:
- Structural Failures: Untreated microcracks can lead to breakages in arms, teeth, or main structures.
- Reduced Efficiency: A grab with worn components loses precision and load capacity, increasing operation times.
- Increased Operating Costs: Corrective repairs, emergency spare parts, and production stoppages have a significant financial impact.
Stemm Products and Solutions for Demanding Environments
At Stemm, we understand the challenges of working with biomass, so we offer specific solutions designed to maximise the performance of your Clamshell grabs. Our offerings include scheduled maintenance kits with high-performance lubricants, replacement seals, pins, and bushings, all selected to ensure equipment durability and efficiency.
We also provide specialised technical support, with expert advice on wear diagnostics and maintenance planning. Additionally, we offer equipment reconditioning services—ideal for restoring grabs that have undergone intensive use and require a complete overhaul.
A preventive maintenance plan, supported by specialised products and services like those from Stemm, is the best investment to ensure your operation runs safely, efficiently, and without interruptions.
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