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The Liebherr 912 is a compact to mid‑size excavator produced by Liebherr‑International AG, a German manufacturer renowned worldwide for heavy‑duty construction equipment. Liebherr has been building hydraulic excavators, wheel loaders, and other earthmoving machinery since the 1950s and remains one of the largest OEMs in the world with a global dealer and parts network. The rear differential (rear diff) in tracked excavators like the 912 transmits torque from the final drive to the tracks, enabling propulsion and steering. Critical components inside this assembly include bearings that support rotating elements and a shaft seal that prevents lubricant leakage. When these wear out or fail, accurate identification of part numbers is essential to get correct replacement components with minimal downtime.
Rear Differential Purpose And Key Terminology
The rear differential, sometimes called the final drive differential or travel gear assembly, is part of the undercarriage propulsion system. Essentially, it changes the rotational direction and delivers torque to the sprocket that drives the track.
Important terms:
• Bearing — A mechanical element that supports shafts and reduces friction between moving parts. Bearings in a diff must withstand radial and axial loads.
• Outer Shell / Inner Shell (Race) — The two halves of a bearing that house rolling elements (balls, rollers). Their dimensions and tolerances govern load capacity.
• Shaft Seal — A specially designed elastomeric or lip seal that prevents transmission or gear oil from leaking out around rotating shafts. In construction equipment with heavy loads and contamination risk, quality seals are crucial.
• Pinion / Gearset — The gear train transferring power from the hydraulic motor or transmission to the final output shafts.
Bearings and seals in a differential run in a lubricated environment. When a bearing or seal fails, it can quickly lead to gear wear, overheating, or diff housing damage if not addressed promptly.
Known OEM Part Numbers For Liebherr 912 Rear Diff Bearings And Shaft Seal
Although official parts catalogs may vary by market and specific diff assembly variant, users often work with Liebherr reference numbers when sourcing parts:
• Bearing Assembly Complete — Liebherr part number 7011747 is referenced as the complete bearing assembly used in the rear diff of the 912. This assembly typically includes outer and inner rings plus rolling elements in a matched set.
• Shaft Seal — Liebherr part number 7014766 is identified as the shaft seal for the diff. This seal prevents diff lubricant from leaking where the axle or pinion shaft exits the housing.
These OEM part numbers are critical when ordering from dealers to ensure correct fitment.
Aftermarket And Manufacturer Identifiers
The OEM numbers are useful, but sometimes you need to find equivalent bearings from major bearing manufacturers:
• One recognized marking on the outer shell of the diff bearing referenced above is TIMKEN HM803110. Timken uses HM codes for tapered roller bearings, where “HM803110” designates a specific bearing series and size compatible with Liebherr’s diff design.
• The inner shell (bearing race) may have a different manufacturer code and sometimes features design details like a raised lip on its outer edge that align with the housing and gearset geometry.
• Alternatively, bearing cross‑reference tools from suppliers like Timken, NSK, SKF, NTN, or others can match bearing dimensions (e.g., bore, outer diameter, width) to find compatible replacements. These alternatives often match the OEM geometry but check load ratings and clearances carefully.
For the shaft seal, aftermarket part numbers such as Liebherr 11167222 are sometimes listed by parts distributors. This item is described as a generic shaft seal for heavy machinery applications and may serve as an equivalent seal for the diff, though confirmation against actual shaft diameter and housing recess is critical before ordering.
Dimensions And Selection Criteria
Bearings and seals in a final drive or differential must be selected based on:
• Bore Diameter — The internal diameter that fits the shaft; measured in mm (e.g., 80 mm, 110 mm).
• Outer Diameter — The external size that fits the diff housing bore.
• Width / Thickness — Governs how the bearing sits axially in the housing.
• Sealing Type — For shafts exposed to contamination, double‑lip or multi‑lip seals are preferred.
• Lubrication General Purpose — Heavy gear oil compatible with roller bearings and diff gears (commonly GL‑5 or machine‑specific lubricant).
Bearings intended for diff use are typically tapered roller bearings due to their ability to take both radial and axial forces, compared to plain ball bearings which perform poorly under axial load. The Timken HM803110 designation indicates a heavy‑duty bearing group appropriate for such applications.
Maintenance Tips And Troubleshooting
Differential bearings and shaft seals are wear items; their life depends on load, contamination, and lubrication maintenance. Recommended practices include:
• Check and replace differential oil regularly per the manufacturer’s recommended intervals; heavy dirt, water ingress, or overheating shortens bearing and seal life.
• Inspect seals anytime maintenance is done on final drives or axles; even small chips in the sealing lip can allow lubricant to leak and contaminants to enter.
• When replacing bearings, press out old races fully and install new races squarely to avoid misalignment that could cause premature failure.
• Clean all mating surfaces before installing seals to ensure a tight fit; even minor scratches can lead to leaks under load.
A field technician once recounted a Liebherr 912 rear diff failure after a bearing spun in its housing because the seal lip had deteriorated and allowed water into the gear oil; the contaminated feed accelerated roller surface pitting. With proper seal replacement and improved lubrication intervals, that excavator returned to reliable service.
Ordering Parts And Aftermarket Solutions
To order parts, always provide the exact Liebherr part number to the dealer or supplier. If you only have the measurement or bearing manufacturer’s code like Timken’s, cross‑reference with a bearing interchange catalog to match dimensions. Similarly, shaft seals often have internal diameter (ID), outer diameter (OD), and cross‑section thickness dimensions stamped or measured on the old seal; match these to OEM numbers or aftermarket listings.
Bearings and differential components for heavy equipment may be stocked under final drive or undercarriage parts categories at many parts suppliers, but always verify fitment.
Conclusion
For the Liebherr 912 excavator, knowing the rear differential bearings (7011747) and shaft seal (7014766) part numbers is essential for effective service and repair. Manufacturer codes like Timken HM803110 help identify compatible bearings from major brands. Matching correct dimensions, high‑quality seals designed for heavy‑duty conditions, and adhering to proper lubrication practices all contribute to long service life and minimized unplanned downtime for tracked earthmoving equipment.
Rear Differential Purpose And Key Terminology
The rear differential, sometimes called the final drive differential or travel gear assembly, is part of the undercarriage propulsion system. Essentially, it changes the rotational direction and delivers torque to the sprocket that drives the track.
Important terms:
• Bearing — A mechanical element that supports shafts and reduces friction between moving parts. Bearings in a diff must withstand radial and axial loads.
• Outer Shell / Inner Shell (Race) — The two halves of a bearing that house rolling elements (balls, rollers). Their dimensions and tolerances govern load capacity.
• Shaft Seal — A specially designed elastomeric or lip seal that prevents transmission or gear oil from leaking out around rotating shafts. In construction equipment with heavy loads and contamination risk, quality seals are crucial.
• Pinion / Gearset — The gear train transferring power from the hydraulic motor or transmission to the final output shafts.
Bearings and seals in a differential run in a lubricated environment. When a bearing or seal fails, it can quickly lead to gear wear, overheating, or diff housing damage if not addressed promptly.
Known OEM Part Numbers For Liebherr 912 Rear Diff Bearings And Shaft Seal
Although official parts catalogs may vary by market and specific diff assembly variant, users often work with Liebherr reference numbers when sourcing parts:
• Bearing Assembly Complete — Liebherr part number 7011747 is referenced as the complete bearing assembly used in the rear diff of the 912. This assembly typically includes outer and inner rings plus rolling elements in a matched set.
• Shaft Seal — Liebherr part number 7014766 is identified as the shaft seal for the diff. This seal prevents diff lubricant from leaking where the axle or pinion shaft exits the housing.
These OEM part numbers are critical when ordering from dealers to ensure correct fitment.
Aftermarket And Manufacturer Identifiers
The OEM numbers are useful, but sometimes you need to find equivalent bearings from major bearing manufacturers:
• One recognized marking on the outer shell of the diff bearing referenced above is TIMKEN HM803110. Timken uses HM codes for tapered roller bearings, where “HM803110” designates a specific bearing series and size compatible with Liebherr’s diff design.
• The inner shell (bearing race) may have a different manufacturer code and sometimes features design details like a raised lip on its outer edge that align with the housing and gearset geometry.
• Alternatively, bearing cross‑reference tools from suppliers like Timken, NSK, SKF, NTN, or others can match bearing dimensions (e.g., bore, outer diameter, width) to find compatible replacements. These alternatives often match the OEM geometry but check load ratings and clearances carefully.
For the shaft seal, aftermarket part numbers such as Liebherr 11167222 are sometimes listed by parts distributors. This item is described as a generic shaft seal for heavy machinery applications and may serve as an equivalent seal for the diff, though confirmation against actual shaft diameter and housing recess is critical before ordering.
Dimensions And Selection Criteria
Bearings and seals in a final drive or differential must be selected based on:
• Bore Diameter — The internal diameter that fits the shaft; measured in mm (e.g., 80 mm, 110 mm).
• Outer Diameter — The external size that fits the diff housing bore.
• Width / Thickness — Governs how the bearing sits axially in the housing.
• Sealing Type — For shafts exposed to contamination, double‑lip or multi‑lip seals are preferred.
• Lubrication General Purpose — Heavy gear oil compatible with roller bearings and diff gears (commonly GL‑5 or machine‑specific lubricant).
Bearings intended for diff use are typically tapered roller bearings due to their ability to take both radial and axial forces, compared to plain ball bearings which perform poorly under axial load. The Timken HM803110 designation indicates a heavy‑duty bearing group appropriate for such applications.
Maintenance Tips And Troubleshooting
Differential bearings and shaft seals are wear items; their life depends on load, contamination, and lubrication maintenance. Recommended practices include:
• Check and replace differential oil regularly per the manufacturer’s recommended intervals; heavy dirt, water ingress, or overheating shortens bearing and seal life.
• Inspect seals anytime maintenance is done on final drives or axles; even small chips in the sealing lip can allow lubricant to leak and contaminants to enter.
• When replacing bearings, press out old races fully and install new races squarely to avoid misalignment that could cause premature failure.
• Clean all mating surfaces before installing seals to ensure a tight fit; even minor scratches can lead to leaks under load.
A field technician once recounted a Liebherr 912 rear diff failure after a bearing spun in its housing because the seal lip had deteriorated and allowed water into the gear oil; the contaminated feed accelerated roller surface pitting. With proper seal replacement and improved lubrication intervals, that excavator returned to reliable service.
Ordering Parts And Aftermarket Solutions
To order parts, always provide the exact Liebherr part number to the dealer or supplier. If you only have the measurement or bearing manufacturer’s code like Timken’s, cross‑reference with a bearing interchange catalog to match dimensions. Similarly, shaft seals often have internal diameter (ID), outer diameter (OD), and cross‑section thickness dimensions stamped or measured on the old seal; match these to OEM numbers or aftermarket listings.
Bearings and differential components for heavy equipment may be stocked under final drive or undercarriage parts categories at many parts suppliers, but always verify fitment.
Conclusion
For the Liebherr 912 excavator, knowing the rear differential bearings (7011747) and shaft seal (7014766) part numbers is essential for effective service and repair. Manufacturer codes like Timken HM803110 help identify compatible bearings from major brands. Matching correct dimensions, high‑quality seals designed for heavy‑duty conditions, and adhering to proper lubrication practices all contribute to long service life and minimized unplanned downtime for tracked earthmoving equipment.
