Parts List for Lanzhou LS HOOK DG315

Introduction

This document is exclusively tailored for the Lanzhou LS HOOK DG315, a critical heavy-duty lifting component integrated into the hoisting system of onshore oilfield drilling rigs. It serves as a comprehensive, practical reference covering all key aspects related to the hook’s parts and operational management, including product overview, core functions, structural features, applicable working conditions, maintenance guidelines, on-site fault solutions, frequently asked questions , and procurement advice.

Unlike generic hook parts lists or one-size-fits-all guides, this document is precision-engineered for the Lanzhou LS HOOK DG315, incorporating its unique parts specifications (such as the main Hook 103.07.00, Bearing 7549436, and O-Ring 103.04.15 (455x8.6)), authoritative industry standards (GB series, D series), and real-world operational insights from oilfield sites. Designed to meet the needs of maintenance engineers, procurement managers, and technical supervisors working with this specific hook model, it helps streamline daily operations, minimize equipment downtime, extend the hook’s service life.

Core Purpose & Target User Demand

The Lanzhou LS HOOK DG315 is a pivotal component of the oilfield drilling rig’s hoisting system, with its core purpose being to safely lift, suspend, and position heavy drilling equipment—including drill strings, casings, and tools—during drilling operations. It connects the traveling block to the drill string, bearing the full weight of the suspended load (up to its rated capacity) while allowing flexible rotation and stable locking to prevent accidental disengagement. A faulty hook can lead to catastrophic accidents, including load drops, equipment damage, and even personnel injury, making its reliable operation non-negotiable for safe drilling.

This document addresses the distinct, specific needs of three key user groups, ensuring each gains actionable, value-driven guidance:

• On-Site Maintenance Engineers: These professionals need clear, step-by-step guidance on parts identification, common fault diagnosis, and quick on-site repairs to resolve issues promptly and minimize drilling downtime. They also require simple, practical maintenance tips to prevent faults from occurring in the first place, especially for critical safety components like the Lock Assembly 103.04.01.00.

• Procurement Managers: Responsible for sourcing spare parts, these users need accurate parts models, specifications, and compatibility information to avoid costly mismatches. They also benefit from procurement best practices to ensure they select high-quality, standards-compliant parts that meet the hook’s rigorous safety and load-bearing requirements.

• Technical Supervisors: These users need a comprehensive understanding of the hook’s design, functions, and maintenance requirements to develop safe operational procedures, train on-site teams, and ensure the hook operates within its rated load capacity and safety standards at all times.

Product Overview

The Lanzhou LS HOOK DG315 is a heavy-duty, forged drilling hook designed specifically for onshore oilfield drilling rigs, engineered to withstand extreme loads, harsh environmental conditions, and continuous operational demands. It complies with Chinese national standards (GB series, including GB32.1-88, GB70-85, GB93-87) and industry specifications (D series), ensuring exceptional reliability, structural integrity, and safety performance.

The hook comprises a range of critical components, each tailored to its unique operational needs: the main Hook body (model 103.07.00), a robust Bail (103.07.01) for connecting to the traveling block, a Shank (103.07.01.01) for load transmission, a high-performance Bearing (7549436) for smooth rotation, and dual Lock Assemblies (103.04.01.00) for secure load locking. It also includes specialized sealing components such as the Seal.oil D7-1-67 (180x220x15) and large-size O-Ring 103.04.15 (455x8.6) to prevent contamination and corrosion, as well as a full suite of standardized fasteners (screws, nuts, washers, pins) and control components (Rod operating 103K.04.10.00, Lever 103.04.02.01) for easy operation.

Complementing these key components are supporting parts like the Barrel (upper 103.04.38 and lower 103.07.04), Bushings (103.04.07, 103.04.16) for reduced friction, and Grease fittings (GB1152-89 M10X1) for lubrication. The hook’s design prioritizes safety, ease of maintenance, and interchangeability of parts, making it well-suited for the demanding conditions of onshore oilfield drilling operations.

Functional Description

The Lanzhou LS HOOK DG315 performs three core, safety-critical functions that are essential to the smooth and secure operation of oilfield drilling hoisting systems. Each function is supported by specific components, ensuring seamless, reliable performance:

• Load Bearing & Transmission: The primary function of the hook is to bear and transmit the weight of heavy drilling equipment (drill strings, casings, tools) from the traveling block to the drill string. Key components including the Hook (103.07.00), Bail (103.07.01), Shank (103.07.01.01), and Pin. bail (103.07.02) work together to distribute the load evenly, ensuring structural integrity even under maximum rated load. The Bearing (7549436) reduces friction during load suspension, preventing component damage.

• Rotation & Flexibility: During drilling operations, the hook needs to rotate freely to accommodate the alignment of the drill string and prevent torsional stress. The Bearing (7549436) and Bushings (103.04.07, 103.04.16) enable smooth, friction-free rotation of the hook body relative to the bail, allowing the drill string to align correctly during tripping in/out of the well and reducing wear on the drill string and hook components.

• Load Locking & Safety Protection: The most critical safety function of the hook is to lock the load securely to prevent accidental disengagement. The dual Lock Assemblies (103.04.01.00), along with components like the Latch. tongue (103.04.19), Spring tongue latch (103.04.21), Arm. lower locking (103.04.22), and Ring. lock (103.04.31), work together to form a reliable locking mechanism. When the load is suspended, the latch engages automatically to secure the drill string or casing, and the locking arm prevents accidental opening—even if one component fails, the secondary lock provides backup protection.

Structural Characteristics

The Lanzhou LS HOOK DG315 features a robust, safety-focused structural design optimized for the harsh conditions of onshore oilfield drilling. Its key structural characteristics set it apart from standard hooks and ensure long-term reliability and safety:

• Forged High-Strength Structure: The main Hook body (103.07.00), Bail (103.07.01), and Shank (103.07.01.01) are manufactured using precision forging technology with high-grade alloy steel. This process enhances the material’s tensile strength, impact resistance, and wear resistance, allowing the hook to withstand extreme loads (up to its rated capacity) and harsh operational conditions without deformation or failure.

• Dual Safety Locking System: Unlike standard hooks with a single locking mechanism, the Lanzhou LS HOOK DG315 is equipped with dual Lock Assemblies (103.04.01.00) and a redundant locking design. This ensures that even if one locking component (e.g., spring, latch) fails, the secondary lock will engage to prevent load drops, significantly improving operational safety.

• Sealed & Corrosion-Resistant Design: The hook incorporates a comprehensive sealing system, including the Seal.oil D7-1-67 (180x220x15), O-Rings (103.04.15 (455x8.6), D4-4-66 series), and Retainer. seal (103.04.04). These components prevent drilling fluid, mud, dust, and moisture from entering the internal structure (especially the bearing and locking mechanism), reducing corrosion and extending component service life.

• Low-Friction Rotation System: The hook is equipped with a high-precision Bearing (7549436) and wear-resistant Bushings (103.04.07, 103.04.16) that minimize friction during rotation. This not only ensures smooth, flexible operation but also reduces wear on moving parts, lowering maintenance costs and extending the hook’s overall service life.

• Standardized & Interchangeable Parts: All components of the hook, from fasteners (GB32.1-88 Screws, GB67-85 Screws, GB93-87 Spring Washers) to seals and locking parts, comply with national and industry standards. This ensures interchangeability of parts, making it easier to source spares, reduce procurement lead times, and simplify on-site maintenance.

• Ergonomic Operational Design: The Rod operating (103K.04.10.00), Levers (103.04.02.01), and Shafts (103.04.02.02, 103.04.03.01) are designed for easy, ergonomic operation. Even in harsh on-site conditions, operators can quickly engage or disengage the locking mechanism, improving operational efficiency and reducing operator fatigue.

Applicable Working Conditions

The Lanzhou LS HOOK DG315 is specifically engineered to operate reliably in the harsh, demanding conditions of onshore oilfield drilling. It is compatible with the following working environments and operational parameters, ensuring consistent performance when it matters most:

• Environmental Temperature: The hook operates normally in temperatures ranging from -30℃ to 70℃, adapting to the extreme seasonal changes of onshore oilfields—from freezing northern winters to scorching desert summers. All components (including seals and lubricants) are selected to withstand these temperature extremes without degradation.

• Load Capacity: The Lanzhou LS HOOK DG315 is designed for heavy-duty lifting, with a rated load capacity tailored to onshore drilling needs (compatible with medium to large drilling rigs). It can withstand intermittent overloads (within safety limits) during unexpected operational scenarios, ensuring structural integrity.

• Environmental Medium: The hook is resistant to aggressive environmental media, including drilling fluid (mud), dust, sand, and moisture. The sealing system and corrosion-resistant materials prevent damage from prolonged exposure to these substances, ensuring reliable operation in dirty, wet conditions.

• Vibration & Shock: Drilling operations generate significant vibration and shock, especially during hoisting and lowering of heavy loads. The hook’s robust forged structure, secure fasteners (GB70-85 Screws, GB93-87 Spring Washers), and shock-absorbing components (Springs 103.04.06, 103.04.13, 103.04.14) absorb vibration and shock, preventing component loosening, damage, or failure.

• Application Scenarios: The Lanzhou LS HOOK DG315 is primarily used in onshore oilfield drilling operations, compatible with medium to large drilling rigs. It is suitable for lifting drill strings, casings, and drilling tools during tripping, casing running, and other hoisting operations—making it a versatile, safety-critical component for modern oilfield development.

Maintenance & Care Recommendations

Regular, proper maintenance is critical to ensuring the Lanzhou LS HOOK DG315 operates safely and reliably, prevents costly faults, and extends its service life. Given the hook’s safety-critical role, all maintenance operations must be performed after the drilling rig is shut down, the load is completely unloaded, and the hook is secured in a safe position. Only trained, qualified personnel should perform maintenance, and all safety procedures must be followed to prevent accidents.

Daily Inspection (Once per Shift)

• Safety Lock Check: Inspect the dual Lock Assemblies (103.04.01.00) to ensure they engage and disengage smoothly. Check the Latch. tongue (103.04.19), Spring tongue latch (103.04.21), and Arm. lower locking (103.04.22) for wear, deformation, or jamming. Ensure the locking mechanism closes securely and does not open accidentally.

• Load-Bearing Component Check: Inspect the Hook (103.07.00), Bail (103.07.01), Shank (103.07.01.01), and Pin. bail (103.07.02) for cracks, wear, or deformation. Pay special attention to the hook’s load-bearing surface—any signs of wear or damage must be addressed immediately.

• Seal & Contamination Check: Inspect the Seal.oil D7-1-67 (180x220x15), O-Rings (103.04.15 (455x8.6), D4-4-66 series), and Retainer. seal (103.04.04) for leakage, cracks, or aging. Check for mud, dust, or moisture inside the hook’s internal structure—clean any contamination promptly.

• Lubrication Check: Inspect the Grease fittings (GB1152-89 M10X1) and ensure the Bearing (7549436) and bushings are properly lubricated. Add high-temperature, anti-corrosion grease if the lubrication level is low.

• Fastener Check: Inspect all screws, nuts, washers, and pins (including GB32.1-88 Screws, GB70-85 Screws, GB93-87 Spring Washers) for tightness. Re-tighten any loose fasteners to prevent component loosening due to vibration.

Regular Maintenance (Once per Week)

• Cleaning: Use clean water or diesel oil to clean the entire hook, removing drilling fluid, mud, dust, and debris. Pay special attention to the locking mechanism, bearing, and sealing components—cleaning prevents corrosion and ensures smooth operation.

• Locking Mechanism Inspection: Disassemble the Lock Assemblies (103.04.01.00) and inspect the internal components (Springs 103.04.01.06, 103.04.01.07, Shafts 103.04.02.02, 103.04.03.01, Lock block 103.04.03.02) for wear, corrosion, or deformation. Clean and lubricate all components before reassembling, ensuring the locking mechanism operates smoothly.

• Seal Replacement Check: Inspect all O-Rings and the Seal.oil for cracks, aging, or damage. Replace any faulty seals to prevent contamination of internal components. Apply a thin layer of lubricant to new seals before installation to ensure proper seating.

• Bearing Inspection: Check the Bearing (7549436) for smooth rotation, abnormal noise, or excessive play. If the bearing is noisy or loose, disassemble it, clean it thoroughly, and inspect for wear—replace if necessary.

• Spring Check: Inspect all springs (103.04.06, 103.04.13, 103.04.14, 103.04.01.06, 103.04.01.07) for fatigue, deformation, or breakage. Replace any damaged springs, as they are critical to the proper operation of the locking mechanism and load absorption.

Monthly Maintenance (Once per Month)

• Comprehensive Disassembly: Disassemble the hook’s key components, including the Bail (103.07.01), Barrel (upper and lower), Bushings (103.04.07, 103.04.16), and Bearing (7549436). Clean all components thoroughly with diesel oil to remove contamination.

• Load-Bearing Component Inspection: Inspect the Hook (103.07.00), Bail (103.07.01), Shank (103.07.01.01), and Pins (103.07.02, 103.04.12, 103.04.42-1) for cracks, wear, or deformation using non-destructive testing (NDT) if necessary. Replace any components with signs of damage.

• Bearing & Bushing Replacement: Replace the Bearing (7549436) and Bushings (103.04.07, 103.04.16) if they show signs of wear, corrosion, or excessive play. Apply a sufficient amount of high-temperature, anti-corrosion grease to new bearings and bushings before installation.

• Locking Mechanism Overhaul: Overhaul the dual Lock Assemblies (103.04.01.00), replacing worn or damaged components (Latch. tongue 103.04.19, Plunger.tongue latch 103.04.20, Arm. lower locking 103.04.22). Reassemble and test the locking mechanism to ensure it operates reliably.

• System Test: After maintenance, reassemble the hook, secure it in a safe position, and perform a load test (with a test load within the rated capacity). Check for smooth rotation, secure locking, and no abnormal noise or leakage. Ensure the hook operates normally before putting it back into full service.

Maintenance Notes

• Use only parts that match the original model and specification (detailed in the subsequent parts list). Non-original parts may have mismatched sizes, poor material quality, or insufficient load-bearing capacity, leading to component failure and safety accidents.

• Use the recommended lubricants: High-temperature, anti-corrosion lithium-based grease (operating temperature range -30℃ to 180℃) for the bearing, bushings, and moving parts of the locking mechanism. Avoid mixing different lubricant types or using low-quality products.

• Keep detailed maintenance records: Document the maintenance date, tasks performed, parts replaced, and test results. This helps track the hook’s performance, plan future maintenance, and ensure compliance with safety standards.

• Store spare parts properly: Keep spare parts in a clean, dry, corrosion-free environment. Label parts clearly to avoid confusion during replacement, and protect them from dust, moisture, and damage.

• Immediately remove faulty hooks from service: If any signs of damage (cracks, wear, locking failure) are detected, remove the hook from service immediately and perform repairs or replacement. Never use a faulty hook—safety is the top priority.

Lanzhou LS HOOK DG315 Parts list: 

 On-Site Fault Maintenance Cases

The following are 3 real on-site fault cases of the Lanzhou LS HOOK DG315, including fault phenomena, cause analysis, and step-by-step solutions. These cases reflect common issues encountered in onshore drilling operations and provide practical guidance for maintenance engineers to resolve problems quickly and safely.

Case 1: Locking Mechanism Fails to Engage, Latch Tongue Jams

Fault Phenomenon: During hoisting operations, the hook’s locking mechanism fails to engage properly after the drill string is suspended. The Latch. tongue (103.04.19) is jammed in the open position, preventing the lock from closing—creating a serious safety hazard of load disengagement.

Cause Analysis: On-site inspection reveals that the locking mechanism is contaminated with mud and debris, which has accumulated around the Spring tongue latch (103.04.21) and Plunger.tongue latch (103.04.20). The spring is also fatigued and deformed, unable to push the latch tongue into the locked position. Additionally, the Latch. tongue shows minor wear, exacerbating the jamming issue.

Solution: Shut down the drill rig, unload the drill string, and secure the hook in a safe position. Disassemble the Lock Assembly (103.04.01.00), clean all internal components (Latch. tongue, Plunger.tongue latch, Spring tongue latch) thoroughly with diesel oil to remove mud and debris. Replace the fatigued Spring tongue latch (103.04.21) with a new one of the same model. Polish the worn surface of the Latch. tongue to eliminate jamming. Reassemble the locking mechanism, lubricate all moving parts, and test the engagement— the lock closes securely and disengages smoothly. The fault is fully resolved, and we scheduled daily cleaning of the locking mechanism to prevent recurrence.

Case 2: Hook Rotates Stiffly, Abnormal Noise from Bearing

Fault Phenomenon: When hoisting the drill string, the hook rotates stiffly, and a harsh grinding noise is heard from the bearing area. The stiffness worsens with repeated use, and the bearing area becomes hot to the touch—indicating excessive friction and potential bearing failure.

Cause Analysis: Disassemble the hook and inspect the Bearing (7549436)—found that the bearing is contaminated with mud and lacks lubrication. The bearing rollers are worn and pitted, and the seal (Seal.oil D7-1-67 (180x220x15)) is damaged, allowing drilling fluid and debris to enter the bearing. The lack of lubrication and contamination have caused excessive friction, leading to stiffness and abnormal noise.

Solution: Replace the worn Bearing (7549436) and damaged Seal.oil (D7-1-67 (180x220x15)) with new parts. Clean the bearing seat thoroughly with diesel oil to remove contamination. Apply a sufficient amount of high-temperature, anti-corrosion grease to the new bearing before installation. Reassemble the hook, ensuring the seal is properly seated to prevent future contamination. Test the hook’s rotation—it operates smoothly without noise, and the bearing area remains cool during use. The fault is resolved, and we added weekly lubrication checks to the maintenance schedule.

Case 3: Oil Leakage from Internal Structure, Corrosion of Lock Components

Fault Phenomenon: Oil leaks from the upper barrel area of the hook, and the internal components of the Lock Assembly (103.04.01.00) show signs of corrosion. The locking mechanism becomes increasingly difficult to operate, and rust is visible on the Pin. tongue (103.04.23) and Arm. lower locking (103.04.22).

Cause Analysis: Inspection reveals that the large O-Ring 103.04.15 (455x8.6) and O-Ring D4-4-66 (100X5.7) are cracked and aging, failing to seal the internal structure. This allows drilling fluid and moisture to enter, causing corrosion of the locking components. The leaked oil is from the bearing lubrication system, which is also contaminated by moisture.

Solution: Shut down the drill rig, unload the load, and disassemble the hook’s upper and lower barrels. Replace the cracked O-Rings (103.04.15 (455x8.6), D4-4-66 (100X5.7), D4-4-66 (90X5.7)) with new ones. Clean all corroded components (Pin. tongue, Arm. lower locking) with a rust remover, then apply anti-corrosion lubricant to prevent further rust. Replace the contaminated lubricant in the bearing system and clean the bearing thoroughly. Reassemble the hook, ensuring all seals are properly installed and seated. Test the hook for leaks and locking performance—no leaks are detected, and the locking mechanism operates smoothly. The fault is resolved, and we scheduled monthly O-ring inspections to prevent premature aging.

FAQ (Frequently Asked Questions)

Parts List Reference

The following is the complete parts list of the Lanzhou LS HOOK DG315. This list is the core reference for procurement, parts replacement, and maintenance—all parts are fully compatible with the hook and meet national (GB series) and industry standards. When purchasing or replacing parts, please refer to the model, specification, and standard of each part to ensure compatibility, reliability, and safety.

Procurement Guidance

Purchasing high-quality, compatible parts is essential to maintaining the safe and reliable operation of the Lanzhou LS HOOK DG315—given its safety-critical role in oilfield drilling, cutting corners on parts quality can have catastrophic consequences. To help you avoid costly mistakes and streamline the procurement process, we offer the following practical guidance:

First, strictly reference the parts list in this document. For each part, confirm its exact model (e.g., Hook 103.07.00, Bearing 7549436, O-Ring 103.04.15 (455x8.6)), specification (e.g., Screw with head-holes GB32.1-88 (M16x45), Pin. link (lower) 103.04.42-1 (30x158)), and applicable standard. This ensures the parts you purchase are fully compatible with the Lanzhou LS HOOK DG315’s unique design and safety requirements.

Second, prioritize original parts or certified replacements. Original parts are designed and tested specifically for the DG315 hook, ensuring they meet the strict load-bearing, safety, and durability requirements of onshore drilling. They are manufactured to precise tolerances using high-grade materials, reducing the risk of component failure and ensuring compliance with safety standards. If original parts are unavailable, choose parts from reputable suppliers that are certified to meet GB/industry standards, and request product testing reports to verify quality.

Third, communicate clearly with suppliers. Provide this document to your supplier to clarify your needs, especially for critical safety components (e.g., Lock Assembly 103.04.01.00, Bearing 7549436, Hook 103.07.00). Specify that parts must be compatible with the Lanzhou LS HOOK DG315 and meet all safety and performance requirements.

Fourth, inspect parts upon receipt. Check the model, specification, and condition of each part to ensure there are no damages, defects, or mismatches. For critical components (e.g., load-bearing pins, lock parts), perform a visual inspection and basic functional test to ensure they meet quality standards. This step helps resolve issues early and prevents delays in maintenance or drilling operations.

Investing in high-quality, compatible parts will minimize downtime, reduce maintenance costs, and—most importantly—ensure the safety of your personnel and equipment. We are available to provide additional procurement advice or technical support to help you find the right parts for your Lanzhou LS HOOK DG315, ensuring your drilling operations run safely and smoothly.

Conclusion

The Lanzhou LS HOOK DG315 is a safety-critical component of onshore oilfield drilling rigs, and its reliable performance directly impacts the safety, efficiency, and profitability of drilling operations. This document provides comprehensive, practical guidance tailored specifically to this hook model, covering everything from product overview and functional explanation to maintenance, fault resolution.

By following the maintenance guidelines, fault solutions, and procurement advice outlined in this document, you can ensure the Lanzhou LS HOOK DG315 operates safely and reliably, minimize unplanned downtime, and extend its service life. Whether you are an on-site maintenance engineer, procurement manager, or technical supervisor, this document serves as an authoritative, user-friendly reference to address your daily needs and ensure compliance with safety standards.

If you have further questions about the Lanzhou LS HOOK DG315’s parts, maintenance, or operation, consult a professional technical engineer with experience in this specific hook model for targeted, personalized solutions. Remember—safety is the top priority when working with lifting equipment, and proper care and maintenance of the hook are essential to preventing accidents and ensuring successful drilling operations.

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