Daily Maintenance Specification for Excavators
1. Overall Maintenance Purpose
Systematic and regular daily maintenance of excavators is the core guarantee for safe and stable equipment operation. Scientific maintenance can effectively reduce equipment failure rates, extend the service life of the whole machine, shorten equipment downtime, improve operating efficiency, and reduce construction and operation costs. Equipment operation and maintenance practice shows that more than 70% of common excavator failures are caused by improper management of oil liquid, water, air intake systems and insufficient basic maintenance. Standardized management of the four core media including fuel, lubricating oil, cooling water and air can avoid most non-mechanical failures.
2. Refined Maintenance Specifications
2.1 Fuel System Management
Fuel quality and management standards directly determine the engine operating condition and the service life of fuel system components. Diesel fuel shall be selected strictly according to the ambient temperature of the operating environment to avoid mismatched fuel grades, inferior fuel and medium contamination. The matching diesel grades for different ambient temperatures are as follows: 0# diesel for temperatures above 0℃; -10# diesel for 0℃ to -10℃; -20# diesel for -10℃ to -20℃; -35# diesel for -20℃ to -30℃.
Daily operation management requirements: Diesel fuel must not be mixed with sediment, dust, water and other impurities, otherwise it will cause premature wear, blockage and poor atomization of fuel pumps and fuel injectors. Inferior diesel with high paraffin and sulfur content will cause damage to the engine, resulting in increased carbon deposition, combustion chamber corrosion and power attenuation. Fill the fuel tank completely after daily operation to prevent condensate from forming on the inner wall of the fuel tank. Drain accumulated water through the drain valve at the bottom of the fuel tank before daily startup.
Special working condition handling: After the engine runs out of fuel, the fuel filter is replaced, or the fuel pipeline is disassembled and maintained, all air in the fuel pipeline must be completely exhausted and the pipeline tightness must be checked to prevent difficult startup, idling jitter and insufficient power. Check the aging and damage of fuel pipeline joints and rubber hoses every week, and replace cracked and oil-leaking pipelines in a timely manner to eliminate fuel leakage risks.
2.2 Special Oil Management
Excavator special oils include engine oil, hydraulic oil, gear oil and other operating oils. Oils of different grades and types are strictly prohibited from mixing. Different oil products adopt different chemical and physical additives during production. Mixing different oils will cause oil deterioration, emulsification and performance failure, leading to severe wear, corrosion and jamming of the engine, hydraulic system and transmission system.
All oil products must be kept clean to prevent impurities such as water, dust and particles from mixing in. Clean the surroundings of the oil filling port and use special filtering and filling equipment before oil filling. Select oil viscosity according to ambient temperature and operating conditions: high-viscosity oil shall be adopted in high-temperature environments to ensure stable oil film and prevent oil dilution failure; low-viscosity oil shall be used in low-temperature environments to reduce flow resistance and ensure smooth cold start and sensitive hydraulic response.
Targeted oil selection: High-viscosity gear oil is used to adapt to the heavy-load transmission of traveling and slewing mechanisms and improve impact resistance and wear resistance. Hydraulic oil with relatively low viscosity and high cleanliness is adopted to reduce pipeline flow resistance, ensure accurate operation and stable pressure of the hydraulic system, and reduce system overheating and internal leakage failures. Replace all oils regularly in accordance with the official maintenance manual and clean sediment in oil pans and pipelines during replacement.
2.3 Grease Lubrication Management
Lubricating grease is used to reduce friction and wear on moving surfaces and eliminate operating noise of excavator components such as pin shafts, bushings, slewing bearings and walking joints. Grease must be stored in a sealed state to prevent mixing of dust, sand, water and other impurities. The storage environment shall be dry, ventilated and away from high temperature and direct light to prevent grease delamination, deterioration and failure.
It is recommended to use G2-L1 lithium-based grease with excellent anti-wear performance, which is suitable for heavy-duty operating conditions. During greasing, fully squeeze out all old deteriorated grease and wipe the lubrication points clean to prevent sand and dust adhesion. Complete full-machine lubrication before daily operation, and increase lubrication frequency in rainy and muddy working conditions.
2.4 Filter Element Maintenance
Filter elements are core components for filtering impurities in oil and air circuits, which can prevent foreign matter from entering the system and causing equipment failures. All filter elements include air filters, fuel filters, engine oil filters and hydraulic filters, and shall be replaced regularly in strict accordance with the requirements of the official operation and maintenance manual. Prolonged service beyond the specified cycle is prohibited.
During filter replacement, check for metal particles attached to the old filter element. If metal impurities are found, diagnose the equipment immediately and take improvement measures to eliminate potential internal wear faults. Only genuine factory filters are allowed. Counterfeit filters have unqualified filtering precision, material strength and filtering area, which will seriously affect the normal operation and service life of excavators. Clean impurities at the filter mounting base and pipeline interface during each replacement to ensure tight sealing.
2.5 Regular Maintenance of Wearing and Sealing Parts
Sealing parts and wearing parts such as oil seals, O-rings and dust-proof frameworks are key components to ensure the tightness and stability of hydraulic and transmission systems. These components are subject to long-term high pressure, friction and alternating temperature changes, and are prone to aging, deformation, cracking and leakage, which are the main causes of equipment oil leakage, pressure loss, dust ingress and water ingress.
Establish regular inspection and replacement ledgers for wearing parts. Replace aging and failed sealing components in advance according to operating cycles and working conditions to avoid faulty operation. Regular replacement of high-quality sealing parts can effectively guarantee the operating accuracy of hydraulic and transmission systems, reduce equipment failures, stabilize operating efficiency and extend the overall service life of excavators.
2.6 Maintenance Specifications for Long-term Equipment Storage
Standardized storage maintenance shall be implemented for excavators placed in long-term idle state to prevent component rust, pipeline aging, battery power loss and mechanical jamming. The specific specifications are as follows:
1. Fuselage protection: Thoroughly clean mud, oil and dust on the whole machine before storage and keep the machine completely dry. Indoor dry and ventilated storage is preferred to avoid erosion from rain, sunlight and sand. If outdoor storage is unavoidable, park the machine on flat, well-drained cement ground and set up rainproof and sunshade facilities to prevent water accumulation and corrosion.
2. Component protection: Place the working device fully on the ground to release the stress of hydraulic cylinder piston rods and prevent deformation and rust caused by long-term suspended load. Apply a thin layer of lubricating grease on exposed piston rods, pin shafts and metal transmission parts for anti-rust protection by isolating air and moisture.
3. Medium and electrical maintenance: Fill the fuel tank completely before storage to prevent inner wall oxidation and rusting. Complete full-point lubrication of the whole machine and replace deteriorated engine oil and hydraulic oil. Add antifreeze in an appropriate proportion according to the minimum ambient temperature to prevent freezing damage to the cooling system. Disconnect the battery negative terminal or remove the battery for separate storage in a dry and constant-temperature environment to avoid self-discharge and plate corrosion.
4. Regular activation maintenance: Start the engine once a month during idle storage. After idling preheating, operate all working devices through full-stroke movements to lubricate moving parts and charge the battery simultaneously. Run the air conditioning refrigeration system for 5 to 10 minutes every month to keep the pipeline and compressor in normal working condition and prevent blockage and jamming.