Komatsu 22J-60-25401 EXCAVATORS FINAL DRIVE ASSEMBLY FINAL DRIVE MOTOR PC18MR

The Travel Device / Final Drive (Part No. 22J-60-25401) for the Komatsu PC18MR mini excavator is a compact, high-torque propulsion unit engineered for light construction, residential renovation, utility maintenance, and landscaping applications in the 1.8-ton machine class. This assembly integrates a high-efficiency axial piston hydraulic motor with a precision multi-stage planetary reduction gearbox, delivering reliable tractive effort and smooth travel performance across a wide range of job site conditions.

• North America & Europe: Designed for confined indoor demolition, residential landscaping, and municipal utility work, with enhanced cold-weather sealing for reliable operation during winter months and consistent performance in wet conditions.
• Southeast Asia & Oceania: Equipped with heavy-duty floating seals that resist ingress of abrasive mud, clay, and tropical soils common in drainage, foundation, and agricultural projects in high-humidity environments.
• Middle East & Africa: Reinforced housing and high-temperature seals protect against sand abrasion and thermal stress in arid desert conditions, ensuring dependable performance on dusty construction sites.

• Compact and Reliable Design: The axial piston motor delivers strong starting torque and smooth speed control, enabling efficient tracking on slopes, soft ground, and uneven terrain typical of mini excavator applications.
• Precision Multi-Stage Reduction: The planetary gear set employs heat-treated alloy steel components manufactured to tight tolerances, ensuring even load distribution across contact surfaces and extended service intervals between overhauls.
• Model-Specific Design for PC18MR: Precision-engineered to match the specific mounting dimensions, hydraulic porting, and performance parameters of the Komatsu PC18MR series, ensuring seamless integration with the machine's undercarriage and hydraulic system.
• Robust Contamination Defense: Dual-cone floating seals combined with heavy-duty dust wipers provide comprehensive protection against moisture, mud, and debris ingress, ensuring reliable operation in wet, dusty, and muddy working environments.

Hydraulic System Care: Routinely inspect case drain lines for restrictions, kinks, or blockages. A restricted drain line can generate excessive back pressure, potentially causing motor seal failure or rotary group damage. Always maintain clean hydraulic fluid and replace return filters according to the machine's prescribed service schedule.

Gear Oil Management: Fill the planetary housing with the recommended extreme-pressure gear oil of the correct viscosity grade. Change the oil every 250-500 operating hours under normal conditions, and every 250 hours in severe applications such as demolition, foundation work, or continuous heavy digging. Examine drained oil for metallic particles as an early diagnostic indicator of gear or bearing wear.

Mounting Bolt Integrity: When reinstalling the travel device assembly, always fit new high-strength bolts. Apply a suitable thread locking compound to the bolt threads prior to torquing to factory specifications, preventing loosening caused by continuous vibration and shock loads during travel and digging operations.

Pre-Start Priming Procedure: Before initial startup or after final drive replacement, fill the motor housing with clean hydraulic oil to purge trapped air pockets. Run the machine at low idle for several minutes, cycling the tracks forward and reverse, to ensure complete lubrication of all planetary components before engaging heavy operational loads.

Guangzhou Tieqi Construction Machinery Co., Ltd. (IRON CAVALRY) is strategically located in Guangzhou's Huangpu District. With nearly 15 years of experience, we specialize in engineering machinery hydraulics and are committed to delivering practical solutions.

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For large items, we use sturdy plywood crates secured with metal fasteners. Products are cushioned with bubble wrap and secured with wooden braces, with special attention given to protecting vulnerable parts. External reinforcement includes high-strength PET plastic strapping and waterproof wrapping.

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