Upper Locking Tongue Positioning Block
Верхний блок позиционирования стопорного язычка
Bloque superior de posicionamiento de lengüeta de bloqueo
The 318812631 Upper Locking Tongue Positioning Block is a precision-engineered alignment component designed for XCMG hydraulic excavators. As a critical non-engine auxiliary part, this positioning block ensures accurate and repeatable positioning of the upper locking tongue in bucket linkage, arm assemblies, and swing mechanisms. Manufactured from high-strength alloy steel with a wear-resistant surface treatment, the 318812631 positioning block guarantees reliable locking, reduced play, and extended service life in the most demanding construction and mining applications.
The 318812631 Upper Locking Tongue Positioning Block is a precision-machined component designed to ensure accurate and repeatable positioning of the upper locking tongue in XCMG hydraulic excavators. As a non-engine auxiliary part, this block is essential for maintaining proper engagement between the bucket linkage and the arm, preventing unwanted movement and enhancing operational safety. Its robust construction and precise geometry guarantee consistent locking force and long-term reliability.
Manufactured from high-quality alloy steel (40Cr) and heat-treated to achieve a hardness of HRC 48–52, the 318812631 positioning block offers excellent wear resistance and dimensional stability. The manganese phosphate coating provides additional corrosion protection and reduces friction, extending the service life of both the block and the mating components. This attention to detail ensures that the block maintains its critical alignment function even under heavy shock loads and continuous operation.
The 318812631 Upper Locking Tongue Positioning Block features a precision-ground positioning slot with a width of 20 mm, providing accurate guidance and positive engagement for the locking tongue. Its overall dimensions of 150 mm length, 55 mm width, and 40 mm height are optimized for direct fitment in XCMG excavator linkages, ensuring seamless integration without modifications.
The block is designed with two 12 mm mounting holes that align perfectly with the original equipment bolt pattern, allowing for quick and secure installation. The manganese phosphate coating not only protects against rust but also provides a micro-porous surface that retains lubricant, reducing wear between the block and the locking tongue. This results in smoother operation, reduced noise, and extended component life.
By using the genuine 318812631 positioning block, operators can restore original locking accuracy and eliminate play in the bucket linkage. Its hardened construction ensures that the block maintains its shape under high loads, preventing premature wear and reducing the frequency of adjustments. This component is essential for maintaining precise bucket control and maximising excavator productivity.
The 318812631 Upper Locking Tongue Positioning Block is specifically designed for use in XCMG hydraulic excavators, including models such as XE210, XE240, XE305, and other XE series machines. It is commonly installed in the bucket linkage assembly, where it positions the upper locking tongue to secure the bucket arm in the folded or extended position. It is also used in arm locking mechanisms and swing drive locking systems.
This positioning block is suitable for a variety of heavy equipment applications beyond excavators, including wheel loaders, backhoe loaders, and demolition shears that require similar locking tongue positioning. Its robust construction and precise dimensions make it ideal for demanding environments where accurate locking is critical for safety and efficiency.
When replacing a worn or damaged positioning block, using the genuine 318812631 part ensures proper fit, material quality, and locking performance. Aftermarket blocks may not match the exact hardness or dimensional tolerances, leading to increased play, premature wear, and potential safety hazards.
Installing the 318812631 Upper Locking Tongue Positioning Block requires basic mechanical skills and standard hand tools. Before installation, thoroughly clean the mounting surface and inspect the locking tongue for wear or damage. Ensure the block is free from burrs or debris that could affect alignment.
Position the block onto the mounting bracket, aligning the holes with the corresponding threaded bores. Install the mounting bolts and tighten them in a cross-pattern to the recommended torque (typically 50–60 N·m for M12 bolts). After installation, verify that the locking tongue moves freely within the slot without binding and that the block is securely fixed.
Periodic inspection of the positioning block is recommended as part of routine maintenance. Check for signs of wear, scoring, or corrosion on the slot surfaces. Measure the slot width to ensure it remains within tolerance; if excessive wear is observed, replace the block to maintain proper locking engagement.
The 318812631 Upper Locking Tongue Positioning Block is manufactured in ISO 9001 certified facilities under strict quality control. The alloy steel is sourced from approved suppliers and undergoes chemical analysis and tensile testing to verify its properties. Each block is forged, heat-treated, and machined to precise tolerances, with critical dimensions inspected using coordinate measuring machines.
The manganese phosphate coating is applied uniformly and tested for thickness and adhesion. The block is inspected for surface finish and slot geometry to ensure smooth tongue movement and accurate positioning. Each unit is 100% inspected to guarantee compliance with XCMG’s stringent OEM specifications.
Using genuine XCMG 318812631 positioning blocks ensures proper fit, locking accuracy, and safety. Counterfeit blocks may lack proper heat treatment or have incorrect slot dimensions, leading to loose locking and potential failure. Always source genuine parts from authorized distributors.
The 318812631 Upper Locking Tongue Positioning Block is an essential component for maintaining precise locking and alignment in XCMG hydraulic excavators. As a non-engine auxiliary part, it ensures that the upper locking tongue engages correctly, providing secure attachment of the bucket arm and preventing unintended movement during operation.
With its high-strength alloy steel construction, precision-ground slot, and corrosion-resistant coating, this positioning block offers exceptional durability and locking accuracy. Choosing the genuine 318812631 block protects your equipment from locking failures and reduces maintenance costs. Always source this part from authorized XCMG distributors to guarantee authenticity and full compliance with specifications.
Whether for planned maintenance or emergency repairs, the 318812631 positioning block is the trusted choice of professionals who demand quality, reliability, and performance from every component in their heavy equipment.
