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As the core equipment of industrial production, the safe operation of overhead cranes is directly related to the productivity of enterprises and the safety of personnel. Therefore, the overhead crane inspection and maintenance must strictly comply with national safety standards, otherwise, it may cause serious accidents. Long-term high-load operation easily leads to wear and tear of key components, and unstandardized maintenance may cause serious accidents such as wire rope breakage and brake failure. In this article, we will provide a safety inspection and maintenance checklist for overhead cranes in line with GB/T 14405-2011 standard, which will help you avoid risks and extend the life of your equipment. Please continue to read the following article:
This checklist is strictly based on the national safety technical specification for special equipment (GB/T 14405-2011 “General-purpose overhead travelling crane”), and applies to the daily inspection, regular maintenance, and compliance check of the following types of overhead cranes:
"It should be emphasized that the installation, transformation, and maintenance (hereinafter referred to as construction) units of bridge cranes must obtain the appropriate special equipment installation, transformation, and maintenance permits, carry out construction within the scope of the permit, and be responsible for construction safety and construction quality."
Quote from "Lifting Appliances Safety and Technical Supervision Regulation—Overhead Travelling Cranes"
The following is a detailed overhead crane daily inspection list PDF and introduction:
غرض | Standard |
---|---|
Main Girder Deformation | Bending deflection ≤ Span/700 under rated load; no cracks, rust, or overall twisting |
Connection Parts | Bolts securely tightened; no weld cracks; surface coating free of bubbles, peeling, or significant rust |
Trolley Frame | No structural cracks/deformation; no loose fasteners; no abnormal wear on rail contact surfaces |
Component | رئيسي Checks | Replacement Criteria |
---|---|---|
Brake | No lubricant leakage; brake lining wear (no exposed rivets); normal brake torque | Lining thickness worn >50% |
Wire Rope | Broken wires ≤10% of total strands; diameter reduction ≤7%; no kinks/crushing | Broken wires >10% in one lay or diameter <93% of nominal |
Sheave Assembly | No abnormal groove wear; no rim cracks; bearings without noise/overheating | Crack depth >3mm |
Component | Main Checks | Maintenance |
---|---|---|
Gearbox | No pitting/broken teeth; oil level normal (no contamination); bearing temp ≤80°C | Oil change every 3,000 hours (L-CKC220 gear oil) |
Wheels | Flange wear ≤10mm; diameter difference between drive/idler wheels ≤2mm | Bearing lubrication (No. 3 lithium grease every 3-6 months) |
Rails | Rail head wear ≤15%; joint gap ≤5mm; bolts securely tightened | Laser alignment quarterly |
Component | Inspection Standard | Insulation failure may lead to a short circuit |
---|---|---|
Current Collector | Good contact between slide wire and shoe; insulated support not loose; no spring rust | Poor contact may cause arcing |
Controller | No contact burning; time relay functions accurately; insulation resistance ≥1MΩ | Failure may cause the collision |
Limit Switches | Functional test passed; emergency brake resets smoothly | Failure may cause collision |
The following is the overhead crane maintenance plan list:
Level | Frequency | Main Tasks | Tools |
---|---|---|---|
Daily Check | Every shift | Visual inspection, E-stop test, lubrication check | Flashlight, checklist |
L1 Maintenance | 500 hours | Gearbox oil change, runway laser alignment, and insulation test | Torque wrench, IR thermometer |
L2 Maintenance | 3,000 hours | Bearing replacement, wire rope replacement, and control system upgrade | Laser aligner, megohmmeter |
Overhaul | 3 years | Bearing replacement, wire rope replacement, and control system upgrade | Hydraulic tools, programmer |
Lubrication Point | Interval | Lubricant Type | Notes |
---|---|---|---|
Wire Rope | 15-30 days | Calcium-based graphite grease (SH0388-1992) | Maintain oil level at 2/3 of the sight glass |
Gearbox | Initial 3 months, then semi-annually | L-CKC220 gear oil (GB5903-1995) | Maintain oil level at 2/3 of sight glass |
Motor Bearings | Annual overhaul | No. 3 lithium grease (GB7324-1994) | Never mix different grease brands |
We suggest downloading and saving this Overhead Crane Inspections Checklist and posting it in the equipment operation room, and have the person in charge sign and file it after each inspection. (For original spare parts or technical support, please contact Weihua Crane; we provide 24-hour emergency response service.)
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