5P4130+7H3608 Translation of Maintenance Methods for Segment Bolts and Nuts

1. Regular Cleaning to Remove Contaminants

• After each operation or every 1–2 weeks, use a high-pressure air gun or brush to clean dirt, gravel, oil, and other debris from the surface of bolts and nuts as well as the gaps in threads. This prevents thread jamming or corrosion caused by debris extrusion.Excavator Bolts
• For long-term operation in humid or dusty environments, wipe the fasteners with a neutral cleaning agent (e.g., weakly alkaline cleaning agent) every month, then dry them with a clean, dry cloth to avoid metal surface erosion by residual acidic or alkaline substances.

2. Check Tightening Status to Prevent Loosening

• Frequency: Check once a month for light-load environments; check once every 2 weeks for heavy-load/vibrating environments (e.g., rotary drilling rig operations), depending on equipment working conditions.
• Method: Use a torque wrench to retighten the fasteners to the rated torque specified in the equipment manual (over-tightening or under-tightening is prohibited). Focus on checking bolts at the joint seams—if bolt displacement or nut loosening is found, stop the machine immediately for retightening to avoid major failures caused by segment structure misalignment.Excavator D8L
• Watch for "False Tightening": If the bolt appears tight but the torque value is significantly lower than the standard, thread wear or gasket failure may be the cause. Disassemble and inspect, then replace the parts if necessary.Bolts and Nuts

3. Enhance Lubrication and Anti-Corrosion Protection

• Thread Lubrication: Every 3–6 months, after disassembling the bolts, apply high-temperature wear-resistant grease (e.g., lithium-based grease) to the thread surface. Alternatively, apply anti-seize compound between the nut and the contact surface during assembly (especially for stainless steel materials) to prevent thread rust and seizing (avoiding difficulty in subsequent disassembly).
• Surface Anti-Corrosion: If the bolts and nuts have no anti-rust coating (e.g., galvanization, chrome plating), spray a layer of anti-rust oil (e.g., mechanical anti-rust agent) on the surface every 6 months. Increase the spraying frequency in highly corrosive environments such as humid areas or coastal regions.

4. Inspect for Wear and Damage, and Replace in Time

• Visual Inspection: During each maintenance, check for cracks, thread deformation, or head deformation (e.g., hexagonal head wear) on bolts, and check for thread stripping or end face depression on nuts. Replace immediately if any of these issues are found—continued use is prohibited.Segment Bolts and Nuts
• Precision Inspection: After disassembly every year, use a thread gauge to test thread precision. If the thread pitch diameter wear exceeds 0.2mm (or follows equipment standards), replace the bolts and nuts as a set (do not replace bolts or nuts individually to avoid excessive fit clearance).
• Accessory Inspection: Simultaneously check whether the matching gaskets (e.g., spring washers, lock washers) are ineffective. If gaskets are deformed or their elasticity is reduced, replace them together with the bolts and nuts to ensure the anti-loosening effect.

5. Special Maintenance for Specific Working Conditions

• Vibration/Impact Scenarios: For high-frequency vibration parts (e.g., crane slewing bearings), additional lock nuts can be installed or spot welding can be used for anti-loosening (in compliance with equipment specifications). Shorten the torque inspection interval to once a week.5P4130+7H3608