Select TBM main bearing sealing grease by matching its sealing and delivery requirements to your machine, ground conditions, water exposure, and operating plan—not by choosing on price or consistency alone. We recommend starting with the TBM manufacturer’s requirements and the actual conditions at the seal, then confirming that a candidate grease can be supplied and pumped through your system. Share those details with your grease supplier before requesting a product recommendation. This process helps you compare options without treating any one grease as suitable for every TBM.
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Main bearing sealing grease helps form and maintain a barrier around the seal area, limiting the ingress of water, soil, and other contaminants. Its role is distinct from that of the main bearing lubricant: the sealing grease is selected for the sealing arrangement and delivery system, while the bearing lubricant must meet the bearing manufacturer’s lubrication requirements. The exact functions and injection points depend on the TBM design. We therefore advise buyers to confirm terminology and application points against the machine documentation before comparing products.
The selection challenge is that conditions can change along a drive. Ground pressure, water, abrasive particles, temperature, and stoppages may all affect how the seal system operates. A grease that can be pumped under one set of conditions may not be an appropriate choice if the delivery line, seal design, or operating environment differs. The goal is to evaluate a product against the complete application, not a single specification in isolation.
Collect the TBM model, main bearing seal configuration, injection points, and any grease specifications issued by the OEM or seal supplier. Ask whether the system has defined limits for grease type, consistency, pressure, or materials compatibility. If a requirement is unclear, request written clarification from the equipment or seal manufacturer. We use these requirements as the boundary conditions for any product discussion.
Record the expected ground types and changes along the route, including abrasive or fine materials where known. Note whether groundwater, slurry, or other fluids may reach the seal area, and identify any relevant changes in water exposure or operating pressure. Avoid reducing the description to labels such as “wet” or “hard”; those terms may conceal important differences between project sections. If conditions are uncertain, mark them as estimates and update the record as excavation progresses.
Document the temperature range relevant to storage, handling, pumping, and operation, using degrees Celsius (°C). Also record the delivery-system configuration, including line length, pump type, injection points, and any pressure limits provided by the machine documentation. When comparing pressure records in different units, use the exact conversion 1 MPa = 10 bar. Do not treat a conversion or a supplier’s general pumpability statement as proof that the grease is compatible with your particular system.
Ask suppliers for the technical data relevant to your application, such as consistency, operating-temperature information, water resistance, and compatibility guidance. Compare those values with the equipment requirements and the conditions you have documented. Do not assume that products with similar appearance or consistency are interchangeable. Before changing from an existing grease, confirm compatibility with the current product and with seal and delivery-system materials through the responsible technical parties.
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Review the actual grease consumption and the replenishment method, using a clear unit such as kilograms per shift (kg/shift). Keep records by TBM section or operating period where possible, so changes can be compared with ground and operating conditions. Consumption by itself does not prove that the seal is working well or poorly; interpret it alongside machine records, injection behavior, and inspection findings. If your records are inconsistent, agree on a measurement method before using them to compare products.
Once a candidate meets the documented requirements, agree on a controlled evaluation with the project and equipment teams. Define in advance what will be monitored, such as delivery behavior, consumption, and any relevant seal or maintenance observations. A practical starting point is to organize operating records across a representative 24-hour period, while extending the observation window if conditions vary or the project requires it. This is a monitoring suggestion, not a guaranteed test duration or proof of product performance.
| Decision area | What to verify | Why it matters |
|---|---|---|
| Equipment requirements | OEM and seal-system specifications | Defines the application limits and required compatibility. |
| Ground and water | Expected abrasiveness, water exposure, and changing conditions | Informs the sealing demands the grease must address. |
| Delivery system | Pump, lines, injection points, and documented pressure limits | Helps assess whether supply and delivery are appropriate. |
| Temperature | Storage, handling, and operating conditions in °C | Supports a relevant comparison of product data and site conditions. |
| Operating records | Consumption in kg/shift and related observations | Creates a baseline for discussion and controlled evaluation. |
Build one application sheet for each TBM or project section, and keep equipment requirements separate from estimated site conditions. Include the source of each value—such as the machine manual, supplier data sheet, or site log—so the team can distinguish verified specifications from assumptions. When the operating environment changes, update the sheet instead of relying on an earlier product decision without review. This simple discipline makes supplier discussions more specific and helps prevent mismatched comparisons.
During operation, record product name and batch identification alongside delivery observations and consumption. Where possible, use the same measurement method from one review period to the next, and note interruptions or changes in ground conditions. If delivery behavior or consumption changes, investigate the system and operating context before assuming the grease itself is the cause. Any adjustment should be agreed with the project’s technical and equipment stakeholders.
At Huadingcheng, we can review your application information and discuss TBM main bearing sealing grease options for your stated operating conditions. To make that conversation useful, prepare the TBM and seal details, available OEM requirements, ground and water description, temperature range, delivery-system information, and current consumption records. We can then help identify the product information and compatibility questions that should be confirmed before procurement or a field evaluation. Final selection should remain consistent with the equipment manufacturer’s instructions and the responsible project team’s approval.
The right TBM main bearing sealing grease is the option that meets the documented requirements of your seal arrangement and delivery system under your actual operating conditions. Start with OEM guidance, characterize ground and water exposure, compare relevant product data, and review compatibility before changing products. Track consumption in kg/shift and interpret it alongside delivery and operating observations rather than as a stand-alone performance measure. For your next step, send Huadingcheng your equipment requirements and operating-condition summary to begin a focused B2B product consultation.
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