906K（L66）、907K（L77）、908K（L88）Full-Cycle Maintenance Guide: Key Nodes + Consumables List
As a highly work-condition-adaptable engineering equipment, the stable performance of the 906K (L66)、907K(L77)、908K(L88) relies on precise full-cycle maintenance. This guide focuses on three core maintenance nodes. It breaks down maintenance procedures and clarifies consumable specifications to help you efficiently manage maintenance schedules and extend the equipment's service life.
I.Initial 500 Hours: Critical Period for New Equipment Running-in, Thorough Basic Maintenance
The initial 500 hours of operation for new equipment is a critical node for the first comprehensive maintenance after running-in. The core focuses on oil change for the transmission system and sealing protection, laying a foundation for stable operation in the subsequent period.
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Transfer Drive Maintenance: Replace with TDTO-grade oil, with a volume of 1.3L (0.34 gal). Note: The mark "*" indicates dry-fill volume, which must be filled in accordance with new equipment assembly standards.
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Front & Rear Differential + Final Drive Oil Change: Fill 8L (2.11 gal) of oil per differential (Diff) and 0.8L (0.21 gal) per hub. It is necessary to ensure consistent oil volume in symmetric front and rear parts to avoid uneven load wear.
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Plug/Sealing Ring Replacement: The transfer drive and front & rear differentials require 2 pcs of 6V-6228 O-rings + 2 pc of 152-6144 plug; each front and rear final drive is equipped with 1 set of sealing components of the same specification. After replacement, check the sealing performance to prevent oil leakage.
II. Every 500 Hours: Core Period for Routine Maintenance, Synchronous Renewal of Multiple Systems
Every 500 hours is a high-frequency operation and maintenance node for equipment, which needs to cover the lubrication, power, and filtration systems to comprehensively eliminate operational wear and maintain work-condition stability.
1. Lubrication System: Replace with 452-6006 basic application grease. Focus on sufficient filling of easily worn parts such as rotating joints and bearings to ensure no dead ends in lubrication coverage and reduce mechanical friction wear.
2. Power System: Dual Protection of Oil + Filter Element
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Engine Oil Change: Use oil of specified specification with a filling volume of 11.2L (2.96 gal), matched with 377-6969 filter element. After replacement, start the equipment and run it at idle speed for 5 minutes to ensure full circulation of the oil.
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Fuel Filtration: Replace 363-5819 main fuel filter element + 463-2166 feed pump filter. Double filter fuel impurities to avoid power reduction caused by fuel injector blockage.
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Filtration Category
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Filter Element Model
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Replacement Key Points
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Engine Air Filter (Main)
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Clean impurities in the filter housing before replacement to prevent residual dust from entering the engine
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Hydraulic Filter
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Vent the air after replacement to prevent air resistance in the hydraulic system
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Cab Air Filter (Fresh Air)
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Clean the air inlet filter screen simultaneously to improve ventilation efficiency
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Cab Air Filter (Circulation)
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Suitable for closed work conditions to ensure a clean operating environment
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III. Every 1000 Hours: Intensive Maintenance Period, Core Component Upgrade
The maintenance every 1000 hours adopts a "basic replication + core upgrade" mode. On the basis of repeating the core content of the initial maintenance, the protection of the air filtration system is strengthened.
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Transmission System Re-inspection and Renewal: Completely repeat the oil change process for the transfer drive, front & rear differentials, and final drives as in the initial 500 hours. Replace plugs and sealing rings simultaneously. Focus on checking the wear of transmission components. If abnormal noise is found, disassemble and inspect in time.
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Air Filtration System Upgrade: On the basis of normal maintenance of the main air filter (110-6326), replace the 110-6331 secondary air filter. Double filtration improves the cleanliness of intake air, which is especially suitable for dusty work conditions and reduces engine cylinder wear.
IV. Every 2000 Hours: System Renewal Maintenance
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Hydraulic System Maintenance Hydraulic Tank: Replace breather (258-2829);
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Hydraulic Oil Replacement: Replace 70L (18.49 gal) of hydraulic oil, and simultaneously replace 286-1016 (Standard Drain Plug), 101-4639 (Eco Drain), and 2M-8780 (Drain O-Ring); replace 2 pcs of Filter O-Ring (8C-3082 / 4F-4097) at the same time;
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Brake System Maintenance: Replace TDTO-grade brake fluid with an oil quantity of 0.2L (0.05 gal).
V. Every 3000/6000/12000 Hours: Deep Maintenance
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Every 3000 Hours: Replace drive belt (5L-3979) and A/C Compressor belt (241-2894);
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Every 6000 Hours: Add 0.34 L (0.09 gal) of Engine Coolant Extender (depending on S·O·S Coolant Sampling Results);
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Every 12000 Hours: Replace coolant with a quantity of 17L (4.49 gal).
If you have more maintenance experience of related models, welcome to share in the comment area!
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