Lanzhou Drawworks JC70 Jack Shaft Assembly (106.68.40.00)

Core Application & Target User Demand

The Jack Shaft Assembly (Main Part No.: 106.68.40.00) is an exclusive, core power transmission component custom-engineered for Lanzhou Drawworks JC70—one of the most reliable drawworks used in onshore and offshore oil and gas drilling operations. Its primary function is to transfer stable, high torque between the drawworks’ main drive system and auxiliary components (including clutches, sprockets, and gears), ensuring synchronized operation of drilling tool lifting, lowering, and positioning mechanisms. Targeting oilfield maintenance technicians, rig fleet managers, procurement specialists, and drilling operation supervisors, this assembly solves critical pain points including shaft misalignment, bearing jamming, gear wear, oil leakage, and fastener loosening—all while complying with API 7K (Clause 6.2 for drawworks transmission systems), GB/T 3077-2015 (alloy steel standards), and relevant GB specifications for bearings, fasteners, and seals (GB283-87, GB288-87, GB5781-86, etc.). It ensures reliable performance in harsh drilling environments, minimizing unplanned downtime and reducing long-term maintenance costs for drilling operations.

Product Introduction

The Lanzhou Drawworks JC70 Jack Shaft Assembly (106.68.40.00) is a fully integrated power transmission system consisting of a main shaft, clutches, sprockets, gears, bearings, seals, fasteners, spacers, shims, and auxiliary components—all precision-manufactured to match the JC70 drawworks’ dimensional, torque, and performance requirements. As a critical intermediate component in the drawworks’ power chain, it acts as a "torque bridge," connecting the main drive to auxiliary systems and ensuring smooth, efficient power distribution. Each component is designed to work in perfect synergy, with strict quality control measures (including non-destructive testing for key parts like the shaft and gear rings) to guarantee compatibility with the original Lanzhou Drawworks JC70, enabling seamless replacement and integration without modifications or adjustments.

Function Description

The main functions of the Lanzhou Drawworks JC70 Jack Shaft Assembly are centered on reliable power transmission, component protection, and operational synchronization for drilling operations: 1. Torque Transfer: Transmit high torque from the drawworks’ main drive assembly to auxiliary components (clutches, sprockets, gears), supporting heavy-load drilling operations such as tool lifting and casing running. 2. Component Alignment: Maintain precise alignment of bearings, gears, and sprockets through spacers, shims, and precision-machined shafts, reducing vibration and preventing premature wear. 3. Clutch Integration: Provide a stable mounting and operation platform for the clutch (115.101.00), clutch drum (106.68.30.09), and clutch spider (106.68.30.08), enabling smooth clutch engagement and disengagement. 4. Lubrication & Sealing: Protect internal moving components (bearings, gears) through oil retainers, seals, and grease fittings, ensuring effective lubrication and preventing oil leakage and contamination. 5. Load Distribution: Distribute torque evenly across gears, sprockets, and bearings to avoid component overload, extending the service life of the entire assembly and associated drawworks systems. 6. Vibration Damping: Use counterweights and shock-absorbing spacers to reduce the impact of rig vibration on internal components, ensuring stable operation during high-intensity drilling.

Structural Features

The Lanzhou Drawworks JC70 Jack Shaft Assembly features a robust, modular, and maintenance-friendly design optimized for durability and performance in harsh oilfield environments, with key structural characteristics including: 1. High-Strength Core Components: The main shaft (106.68.40.06) and gear rings (106.06.40.14-1, 106.06.40.15-1) are made of heat-treated 40Cr alloy steel, ensuring exceptional torque resistance, fatigue strength, and wear resistance—critical for long-term high-load operation. 2. Precision Bearing System: Equipped with GB283-87 (cylindrical roller bearings) and GB288-87 (ball bearings), paired with external and internal bearing spacers, to ensure smooth rotation, reduce friction, and handle radial and axial loads effectively. 3. Modular Component Design: All parts (clutches, bearings, seals, fasteners) are independently replaceable, allowing maintenance technicians to replace damaged components without disassembling the entire assembly—saving time and labor costs. 4. Effective Sealing & Lubrication Structure: Multiple oil retainers (106.68.40.04, 106.68.40.05), seals (106.68.41.00), and grease fittings (GB1152-89) prevent lubricant leakage and protect internal components from drilling mud, dust, and moisture; grease fitting boxes (106.68.40.10) keep lubrication points clean and accessible. 5. Adjustable Alignment Mechanism: Multiple shim sets (106.68.40.02, 106.11.40.05, 106.11.40.06, 106.11.30.34) and spacers allow precise adjustment of component alignment, compensating for wear and ensuring optimal performance over time. 6. Secure Fastening System: Compliant with GB5781-86, GB32.1-88 bolts, paired with GB6170-86 nuts and GB93-87 washers, along with locking wires, to prevent vibration-induced loosening in high-vibration drilling environments. 7. Vibration Reduction: Counterweights (106.11.40.13-15, 106.11.40.22) reduce rotational vibration, protecting bearings and gears from premature failure.

Applicable Working Conditions

The Lanzhou Drawworks JC70 Jack Shaft Assembly is specifically engineered to withstand the harsh, demanding operating conditions of oil and gas drilling, including: 1. Onshore & Offshore Drilling: Compatible with both onshore land rigs and offshore platforms, resisting high humidity, salt spray, and extreme temperature fluctuations (ranging from -25℃ to 65℃). 2. High-Torque, Heavy-Load Operations: Capable of supporting continuous high-torque transmission (matching the JC70 drawworks’ rated load) during prolonged drilling tool lifting, casing running, and well completion operations. 3. Contaminated Environments: Resistant to drilling mud, sand, dust, and other abrasive contaminants, thanks to effective sealing components (oil retainers, seals) and protective covers (bearing box covers). 4. Continuous Operation: Designed for long-term continuous operation (up to 24 hours/day) with minimal maintenance, ensuring high availability and reliability for critical drilling operations. 5. High-Vibration Environments: Robust structural design, counterweights, and vibration-damping spacers reduce the impact of rig vibration on internal components, preventing misalignment and premature wear. 6. Corrosive Environments: Anti-corrosion coatings on fasteners, shafts, and gear rings protect against rust and corrosion from saltwater (offshore) and drilling fluids.

Maintenance & Care Recommendations

To extend the service life of the Lanzhou Drawworks JC70 Jack Shaft Assembly and ensure consistent, reliable operation—aligned with API 7K maintenance guidelines and Lanzhou Drawworks equipment specifications—follow these practical, easy-to-implement maintenance recommendations: 1. Lubrication Maintenance: Inject high-quality lithium-based grease (NLGI Grade 2) through GB1152-89 grease fittings every 150 working hours; clean grease fitting boxes (106.68.40.10) regularly to prevent clogging. Replace gear oil and lubricants every 400 working hours, or immediately if contaminated by drilling mud or water. 2. Regular Inspection: Conduct daily visual inspections for oil leakage, loose fasteners, abnormal noise, and excessive vibration; check bearing temperature (replace if exceeding 85℃) and gear meshing condition monthly; inspect clutch engagement/disengagement and component alignment quarterly. 3. Component Replacement: Replace seals (106.68.41.00) and oil retainers every 6 months or if leakage is detected; replace bearings (GB283-87, GB288-87) if abnormal noise, wear, or overheating is observed; replace fasteners after 3-5 disassembly cycles to avoid fatigue failure; replace shim sets if alignment issues persist. 4. Alignment Check: Use shim sets to adjust component alignment annually or after replacing key parts (shaft, bearings, gears) to ensure smooth rotation and reduce vibration. 5. Contamination Control: Clean drilling mud, dust, and debris from the assembly, bearing boxes, and grease fittings regularly to prevent abrasive wear on gears, bearings, and seals. 6. Storage & Handling: When not in use, store the assembly in a dry, clean environment; apply anti-corrosion grease to all metal components to prevent rust; handle components carefully (especially shafts and gear rings) to avoid impact damage during installation and disassembly. 7. Clutch Maintenance: Inspect the clutch (115.101.00), clutch drum (106.68.30.09), and clutch spider (106.68.30.08) during each maintenance cycle, replacing worn friction components as needed.

On-Site Fault Repair Cases

Case 1: Bearing Jamming and Abnormal Noise

Fault: A Lanzhou Drawworks JC70 experienced abnormal grinding noise from the jack shaft assembly, followed by bearing jamming and drawworks shutdown. Root Cause: Clogged grease fitting (GB1152-89) and contaminated lubricant caused insufficient lubrication, leading to damage to GB288-87 bearings and external bearing spacer (106.68.30.13)—violating GB/T 307-2015 bearing maintenance standards. Solution: Replaced the clogged grease fitting, damaged bearings, and bearing spacer; cleaned the bearing box (106.11.40.07) and grease fitting box; refilled with clean lithium-based grease. Outcome: Bearing jamming resolved, abnormal noise eliminated, and the assembly resumed smooth, stable operation.

Case 2: Gear Wear and Torque Loss

Fault: The JC70 drawworks experienced reduced torque transmission and abnormal gear meshing noise from the jack shaft assembly, accompanied by increased vibration. Root Cause: Misaligned internal gear ring (106.06.40.14-1) and external gear ring (106.06.40.15-1) due to worn shim set (106.11.40.05); lack of regular lubrication accelerated gear wear—violating API 7K Clause 6.2.3 for gear maintenance. Solution: Replaced the worn shim set and damaged gear rings; adjusted gear alignment using precision shims; cleaned and lubricated all gear surfaces. Outcome: Torque transmission restored to rated levels, gear noise reduced, and vibration minimized.

Case 3: Oil Leakage and Bearing Damage

Fault: Oil leakage was observed around the bearing box cover (106.11.40.08) and oil seal retainer (106.68.30.10), leading to bearing overheating and premature wear. Root Cause: Worn seal (106.68.41.00) and oil retainer (106.68.40.04); loose GB5781-86 bolts on the bearing box cover caused poor sealing—violating GB/T 13871-2008 seal performance requirements. Solution: Replaced the worn seal and oil retainer; retightened all bolts to specified torque (35-40 N·m); inspected and cleaned the bearing box. Outcome: Oil leakage stopped, bearing temperature returned to normal, and bearing service life extended.

Case 4: Clutch Engagement Failure

Fault: The drawworks clutch (115.101.00) failed to engage properly, leading to inability to transfer torque and operate drilling tools. Root Cause: Misaligned clutch spider (106.68.30.08) and clutch drum (106.68.30.09) due to worn spacer (106.68.30.11); damaged GB1096-79 key caused rotational slippage—violating API 7K Clause 6.2.2 for clutch alignment. Solution: Replaced the worn spacer and key; adjusted clutch alignment; inspected and tightened clutch mounting fasteners. Outcome: Clutch engagement restored to normal, torque transfer resumed, and the drawworks returned to regular operation.

FAQ

Procurement Guide

The Lanzhou Drawworks JC70 Jack Shaft Assembly (106.68.40.00) and all its accompanying components are engineered to meet the highest industry standards, including API 7K, GB/T 3077-2015, and relevant GB specifications for bearings, fasteners, and seals. Each component undergoes strict quality control—from material selection and precision manufacturing to pressure testing, leak detection, and non-destructive testing for key parts—ensuring reliability, durability, and seamless compatibility with the Lanzhou Drawworks JC70. Whether you need to replace the entire jack shaft assembly or individual components (e.g., bearings, gears, seals, clutch parts), selecting parts with the original part numbers listed ensures optimal performance, reduces maintenance costs, and minimizes unplanned downtime for your drilling operations. Our products are designed to solve the critical pain points of oilfield operations—torque loss, component wear, oil leakage, and misalignment—providing long-term value and operational stability. Contact us today to place your order; our professional technical team is available to provide comprehensive support, including fault diagnosis, maintenance guidance, and product selection advice, to help you keep your Lanzhou Drawworks JC70 operating efficiently and reliably in even the harshest drilling environments. Trust our genuine, high-quality components to keep your drilling operations running smoothly.

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