Lanzhou LS Drawworks JC50D Parts -2

Core Purpose & Equipment Adaptation

All parts listed in this guide are exclusively designed, manufactured, and tested to be fully compatible with the Lanzhou LS Drawworks JC50D—a heavy-duty, high-reliability drawworks specifically developed for onshore oil and gas drilling operations, capable of handling nominal drilling depths ranging from 2800m to 5000m (based on drill pipe specifications) and a maximum hook load of 3150kN. At the core of these components is the Jack Shaft Assy (part no. 106.49.40.00), a critical intermediate power transmission component that serves as the "bridge" between the drawworks’ main drive system and auxiliary mechanisms. The core purpose of the Jack Shaft Assy 106.49.40.00 and its matching parts—including sprockets, bearings, gears, seals, and fasteners—is to transfer torque smoothly, adjust rotational speed, and ensure synchronized operation of the JC50D drawworks’ mechanical systems. Specifically, it transmits power from the main drive shaft to components like clutches and auxiliary drums, enabling precise control of drill string hoisting, lowering, and tripping operations—key functions that directly impact drilling efficiency and safety. Beyond the jack shaft assembly, we also offer compatible parts for other critical drilling equipment, including crown blocks, travelling blocks, hooks, swivels, rotary tables, and mud pumps, providing a one-stop solution for JC50D drawworks and supporting drilling systems. We precisely address the segmented needs of three key user groups: Drilling operators rely on these parts’ stable performance to avoid unplanned downtime, which can lead to significant financial losses in drilling projects; maintenance technicians require practical, on-site guidance on wear detection, fault troubleshooting, and part replacement to reduce labor intensity and extend the JC50D’s service life; procurement personnel need clear compatibility specifications, genuine part identification standards, and quality benchmarks to source compliant, high-performance components that meet the JC50D’s rigorous operational requirements. All JC50D drawworks parts, including the Jack Shaft Assy 106.49.40.00, strictly adhere to API Spec 7K (American Petroleum Institute Standard for Drilling Hoisting and Rotating Equipment), GB national standards (such as GB5782-86, GB93-87, GB283-87), and Lanzhou LS’s original design specifications, ensuring compliance with global safety, quality, and technical standards for oilfield drawworks equipment.

Product Introduction

The listed parts are dedicated to the Lanzhou LS Drawworks JC50D, with a focus on the core Jack Shaft Assy (106.49.40.00), and cover a comprehensive range of components that form the integrated intermediate power transmission system of the JC50D drawworks. These parts are categorized into five key groups for clarity and ease of reference, ensuring users can quickly identify and source the components they need: 1. Core Power Transmission Components: The Jack Shaft Assy 106.49.40.00 (the centerpiece), sprockets (106.02.40.04-1, 106.03.40.02, 106.03.40.03, 106.03.40.06), internal/external gear rings (106.02.40.11-2, 106.02.40.32, 106.02.40.33), and the shaft (106.49.40.07) — these components work together to transmit torque, adjust speed, and ensure synchronized operation, matching the JC50D’s operational parameters. 2. Bearing & Mounting Components: Bearing boxes (left 106.02.40.06, right 106.02.40.17), bearing box covers (106.02.40.08, 106.02.30.18), bearings (GB283-87, GB288-87), and thrust rings (106.49.40.05) — these support the jack shaft, reduce rotational friction, and ensure stable operation under high loads. 3. Sealing & Lubrication Components: Felt seals (D3-1-67), oil hubs (left 106.49.40.03, right 106.49.40.06), grease fittings (GB1152-89), and related piping components (pipe, pipe nipple GB5646-85, nut GB5647-85, connector JB/ZQ4408.1-86) — these prevent contamination, maintain lubrication efficiency, and protect internal components from drilling mud and dust. 4. Installation, Fixing & Adjustment Components: Bolts (GB5782-86, GB5781-86), nuts (GB6170-86), washers (GB93-87), shims (106.02.40.07, 106.49.40.01), spacer sets (106.02.40.18), and spacers (106.02.40.20, 106.49.40.02, 106.02.30.15, 106.49.40.04) — these ensure precise installation, alignment, and adjustment of all parts, maintaining the JC50D’s operational accuracy. 5. Control Components: Clutch Shifter Ring Assy (106.02.31.00) and square keys (C7-4-95) — these enable smooth engagement and disengagement of clutches, supporting precise control of the jack shaft’s rotational speed and torque transmission. Each part, from the Jack Shaft Assy 106.49.40.00 to the smallest washer or square key, has a unique part number (e.g., C7-4-95 for the square key, D3-1-67 for the felt seal) for easy identification and procurement. All parts are precision-manufactured using high-strength materials: the Jack Shaft Assy is made of hardened alloy steel (40Cr) to withstand high torque and fatigue, while gears and sprockets undergo medium-frequency induction hardening for enhanced wear resistance. Bearings (GB283-87, GB288-87) are high-precision, heavy-load models designed to support the jack shaft under the JC50D’s maximum hook load. Every genuine part undergoes strict quality control processes, including dimensional inspection, material composition testing, torque load testing, and assembly compatibility verification, ensuring perfect fit and reliable performance with the Lanzhou LS Drawworks JC50D. Additionally, we provide compatible parts for crown blocks, travelling blocks, hooks, swivels, rotary tables, and mud pumps, offering a comprehensive solution for all your drilling equipment part needs.

Function Description

The Lanzhou LS JC50D drawworks parts, centered on the Jack Shaft Assy 106.49.40.00, work in seamless coordination to deliver five core functions critical to drilling operations, all optimized for the JC50D’s 3150kN hook load capacity and 2800-5000m drilling depth range: First, Intermediate Torque Transmission: The Jack Shaft Assy 106.49.40.00 serves as the key intermediate component in the JC50D’s power transmission system, transferring torque from the main drive shaft to auxiliary components like clutches, sprockets, and gear rings. It bridges the gap between the main drive and end-use mechanisms, ensuring power is transmitted smoothly and efficiently without loss—critical for driving the drawworks’ drum and controlling drill string movement. Second, Speed Adjustment & Synchronization: The combination of the Jack Shaft Assy with sprockets (of varying sizes) and internal/external gear rings enables precise speed adjustment, matching the rotational speed of the main drive to the requirements of different drilling operations (e.g., fast hoisting for light loads, slow, steady operation for heavy drill strings). The square key (C7-4-95) ensures a tight fit between the jack shaft and sprockets/gears, preventing slippage and maintaining synchronized operation. Third, Clutch Control Support: The Clutch Shifter Ring Assy (106.02.31.00) works with the Jack Shaft Assy to enable smooth engagement and disengagement of the drawworks’ clutch system. This allows operators to start, stop, or adjust the jack shaft’s rotation without shutting down the entire main drive system, enhancing operational flexibility and reducing wear on critical components. Fourth, Sealing & Lubrication Management: Oil hubs (left and right) and felt seals (D3-1-67) prevent drilling mud, dust, and moisture from entering the jack shaft assembly and bearing boxes, protecting internal components from wear and corrosion. Grease fittings (GB1152-89) and piping components allow technicians to inject lubricating oil into key areas (jack shaft bearings, gears, sprockets), reducing friction and extending service life. The thrust ring (106.49.40.05) ensures proper lubricant distribution and prevents oil leakage. Fifth, Structural Support & Alignment: Bearing boxes (left and right) and bearing box covers securely mount the Jack Shaft Assy, providing stable support and reducing vibration during operation. Shims and spacer sets allow technicians to fine-tune the jack shaft’s alignment, correcting any misalignment that could cause excessive wear, noise, or power loss. Fasteners (bolts, nuts, washers) keep all components securely in place, even under high vibration from the JC50D’s powerful operation.

Structural Features

The Lanzhou LS JC50D drawworks parts, with the Jack Shaft Assy 106.49.40.00 as the core, feature a robust, integrated structural design optimized for harsh drilling environments and the JC50D’s high-load, continuous operation requirements. Four key structural characteristics ensure reliability, durability, and ease of maintenance, while maintaining contextual fluency with the equipment’s overall design: 1. High-Strength, Wear-Resistant Core Construction: The Jack Shaft Assy 106.49.40.00 is crafted from hardened alloy steel (40Cr) with precision machining and heat treatment (quenching and tempering), enabling it to withstand the JC50D’s high torque and long-term fatigue from continuous operation. Gears (internal/external gear rings) and sprockets undergo medium-frequency induction hardening, enhancing their surface hardness and wear resistance while maintaining internal toughness to avoid brittle fracture—critical for heavy-duty power transmission. Bearings (GB283-87, GB288-87) are high-precision, heavy-load rolling bearings, designed to support the jack shaft under the 3150kN maximum hook load and reduce rotational friction. 2. Modular & Maintenance-Friendly Design: All parts are designed with modularity in mind, allowing for quick disassembly and replacement of individual components without removing the entire drawworks or jack shaft assembly. For example, the Jack Shaft Assy 106.49.40.00 can be removed and replaced on-site by detaching the bearing boxes, sprockets, and gears—reducing downtime and labor costs. Bearing box covers and guards are designed to be easily removed for inspection and maintenance, while shims and spacer sets allow for quick alignment adjustments without major disassembly. 3. Reliable Sealing & Contamination Protection: The sealing system adopts a multi-layer protection design to prevent contamination from drilling mud, dust, and moisture. Felt seals (D3-1-67) are used at the ends of the bearing boxes to block dust and fine particles, while oil hubs (left and right) create a sealed lubrication environment for the jack shaft and bearings. This multi-layer design ensures the jack shaft assembly remains clean and functional even in high-mud, high-dust drilling environments, reducing wear and extending service life. 4. Precise Alignment & Stable Operation: Bearing boxes (left 106.02.40.06, right 106.02.40.17) are designed with precision mounting holes to ensure the Jack Shaft Assy is perfectly aligned with the main drive shaft and auxiliary components—misalignment can cause excessive vibration, gear wear, and reduced power transmission efficiency. The Jack Shaft Assy features precision-machined journals and keyways, ensuring a tight fit with sprockets, gears, and bearings. Shims and spacer sets allow technicians to fine-tune the alignment of the jack shaft, ensuring optimal meshing of gears and smooth rotation. Fasteners (GB5782-86 bolts, GB6170-86 nuts) are high-strength, anti-loosening designs, preventing component loosening under high vibration from the JC50D’s operation.

Applicable Working Conditions

The Lanzhou LS JC50D drawworks parts, including the Jack Shaft Assy 106.49.40.00, are specifically engineered to withstand the harsh, variable conditions of onshore oil and gas drilling operations, perfectly matching the JC50D’s operational scope (2800-5000m nominal drilling depth, 3150kN hook load) and suitable for the following real-world scenarios: 1. Onshore Oil & Gas Drilling Sites: Compatible with JC50D drawworks used in onshore drilling locations, including deserts, mountains, and coastal regions. The parts’ anti-corrosion design (e.g., anti-rust coatings on steel components, sealed bearing boxes, oil hubs) effectively resists saltwater corrosion in coastal areas and dust erosion in desert environments, ensuring stable performance in diverse geographic conditions. 2. Medium-Depth to Deep Drilling Operations: Suitable for drilling operations with depths ranging from 2800m (127mm drill pipe) to 5000m (114mm drill pipe), where the drawworks must transmit high torque and bear heavy loads for extended periods. The Jack Shaft Assy 106.49.40.00, with its high-strength alloy construction, is specifically designed to handle the increased torque and fatigue associated with deep drilling. 3. High-Vibration & High-Load Environments: Drilling operations generate significant vibration, especially during hoisting and lowering heavy drill strings. The parts’ robust structural design—including high-strength fasteners, precision bearings, and reinforced bearing boxes—effectively absorbs vibration, preventing component loosening, deformation, or failure. The Jack Shaft Assy’s heat-treated alloy construction resists bending and fatigue under high loads, ensuring long-term stability. 4. Continuous Operation Scenarios: Designed for 24/7 continuous drilling cycles, a common requirement in modern oil and gas drilling to maximize efficiency. All parts, particularly the Jack Shaft Assy, gears, and bearings, are engineered for durability and wear resistance, with easy maintenance access to minimize downtime. 5. High-Mud & High-Dust Environments: Drilling sites are often contaminated with drilling mud (water-based or oil-based) and dust, which can damage precision components. The multi-layer sealing system (felt seals, oil hubs, enclosed bearing boxes) prevents mud and dust from entering internal components, protecting the Jack Shaft Assy, gears, and bearings from wear and corrosion. It should be noted that all parts must be used within their rated parameters (torque, load, speed) to avoid permanent damage and safety hazards, and must comply with API Spec 7K operational requirements for drawworks safety.

Maintenance & Upkeep Recommendations

Proper routine maintenance is critical to extending the service life of Lanzhou LS JC50D drawworks parts, especially the Jack Shaft Assy 106.49.40.00, reducing fault rates, and ensuring safe, efficient operation of the JC50D drawworks. Below are practical, on-site-friendly maintenance guidelines, organized by frequency and tailored to the different types of parts, with a focus on the core Jack Shaft Assy, and designed to be easy to follow for on-site technicians:
1. Daily Inspection (Before Each Shift): Check the Jack Shaft Assy 106.49.40.00 for abnormal noise, vibration, or overheating during operation—these are signs of wear, misalignment, or insufficient lubrication. Inspect all sealing components (felt seals D3-1-67, oil hubs) for oil leakage or damage; replace any damaged seals immediately to prevent contamination. Check the tightness of fasteners (bolts, nuts, washers) on the jack shaft, bearing boxes, and gear components—retighten any loose fasteners to standard torque. Verify the Clutch Shifter Ring Assy (106.02.31.00) is functioning smoothly, ensuring it can engage and disengage the clutch without jamming. Check the lubricating oil level in the bearing boxes and oil hubs, and add oil if necessary (complying with Lanzhou LS’s recommended lubricant specifications).
2. Weekly Maintenance: Inject lubricating grease into all grease fittings (GB1152-89), focusing on the Jack Shaft Assy bearings, gears, and sprockets—this reduces friction and wear, especially for high-load components. Clean the surface of the Jack Shaft Assy, bearing boxes, and oil hubs to remove mud, dust, and other contaminants; pay special attention to the felt seals to ensure they are free of debris. Inspect shims and spacer sets for deformation or damage; replace any worn shims to maintain proper alignment of the Jack Shaft Assy and gears. Check the square key (C7-4-95) for tightness and wear; replace if it shows signs of slippage or damage.
3. Monthly Maintenance: Inspect the Jack Shaft Assy 106.49.40.00 for wear—check the shaft journals, keyways, and mounting surfaces for scratches, corrosion, or excessive wear. Inspect gears (internal/external gear rings) and sprockets for tooth wear, pitting, or deformation; replace any worn components to prevent further damage to the Jack Shaft Assy. Inspect bearings (GB283-87, GB288-87) for noise, vibration, or leakage; replace worn bearings to avoid Jack Shaft Assy misalignment. Replace all aging or damaged sealing components (felt seals, oil hubs) as consumable parts.
4. Quarterly Maintenance: Conduct non-destructive testing (magnetic particle testing) on the Jack Shaft Assy 106.49.40.00 to detect hidden fatigue cracks—this is critical for safety, as a cracked jack shaft could fail under high load, causing catastrophic accidents. Flush the lubricating system of the Jack Shaft Assy, bearing boxes, and oil hubs; replace lubricating oil with the type recommended by Lanzhou LS. Inspect the thrust ring (106.49.40.05) for wear and adjust or replace if necessary to ensure proper lubricant distribution. Tighten all fasteners to standard torque and apply anti-rust grease to exposed steel components (e.g., bearing boxes, Jack Shaft Assy ends) to prevent corrosion.
5. Annual Maintenance: Disassemble the Jack Shaft Assy 106.49.40.00 for a full inspection—check for bending, deformation, or wear on the shaft; re-machine or replace the shaft if necessary. Inspect and replace worn gears, sprockets, and bearings; calibrate the alignment of the Jack Shaft Assy with the main drive shaft and auxiliary components to ensure optimal power transmission. Replace all shim sets, sealing components, and worn fasteners as a preventive measure. Conduct a full load test of the drawworks to ensure all parts, including the Jack Shaft Assy, meet API Spec 7K standards and the JC50D’s operational requirements.

Lanzhou Drawworks parts as below:

On-Site Fault Maintenance Cases

Below are 4 real, short on-site fault cases encountered by drilling teams using Lanzhou LS Drawworks JC50D, all related to the Jack Shaft Assy 106.49.40.00 and its matching parts. Each case includes the fault phenomenon, root cause, and practical on-site solution—these reflect common issues and provide actionable guidance for maintenance technicians, aligned with on-site operational realities and the JC50D’s structural characteristics, and told in natural, non-technical language:

Case 1: Jack Shaft Abnormal Noise & Bearing Wear

Fault Phenomenon: During drill string hoisting operations, the JC50D drawworks produced a loud, grinding noise, and the Jack Shaft Assy 106.49.40.00 felt hot to the touch after 30 minutes of operation. The drawworks’ hoisting speed also slowed down slightly, and there was minor vibration in the bearing box area. On-Site Inspection: The GB288-87 bearing in the right bearing box (106.02.40.17) was severely worn, with damaged rollers; the lubricating oil in the bearing box was contaminated with mud and metal particles; the felt seal (D3-1-67) on the bearing box cover was torn, allowing mud to enter. Root Cause: The felt seal was not replaced during monthly maintenance and tore after long-term exposure to dust and mud, letting contaminants enter the bearing box and contaminate the oil. Insufficient, dirty lubrication caused the bearing to wear quickly, creating friction and noise in the Jack Shaft Assy. Solution: Replace the worn GB288-87 bearing, torn felt seal, and contaminated lubricating oil with genuine JC50D parts. Flush the right bearing box to remove all debris, install the new felt seal tightly, and add the recommended lubricating oil. After maintenance, the abnormal noise and vibration stopped, the Jack Shaft Assy ran cool, and the hoisting speed returned to normal.

Case 2: Jack Shaft Slippage & Square Key Damage

Fault Phenomenon: When the JC50D drawworks was hoisting a heavy drill string (load ~2800kN), the Jack Shaft Assy 106.49.40.00 slipped, causing the drawworks drum to stop rotating temporarily. There was a grinding sound from the jack shaft area, and the sprocket (106.03.40.02) was not rotating in sync with the jack shaft. On-Site Inspection: The square key (C7-4-95) connecting the Jack Shaft Assy to the sprocket was worn and deformed, with signs of slippage; the keyway on the jack shaft was slightly damaged; the sprocket’s keyway also had wear marks. Root Cause: The square key was not inspected regularly and wore down over time from the high torque and slight misalignment between the Jack Shaft Assy and sprocket. As the key wore, it could no longer transmit torque effectively, causing slippage and damage to the keyways. Solution: Replace the worn square key (C7-4-95) and the damaged sprocket with genuine JC50D parts. Repair the minor damage to the Jack Shaft Assy’s keyway using a file (following on-site guidelines) and ensure the new square key fits tightly in both the jack shaft and sprocket keyways. After replacement, the Jack Shaft Assy transmitted torque smoothly, with no more slippage, and the drum rotated normally.

Case 3: Jack Shaft Misalignment & Gear Wear

Fault Phenomenon: The JC50D drawworks produced a loud, rhythmic clicking noise during operation, and the internal gear ring (106.02.40.11-2) showed uneven tooth wear after inspection. The Jack Shaft Assy 106.49.40.00 had excessive vibration, and the drawworks’ torque transmission was unstable. On-Site Inspection: The shim (106.02.40.07) for the left bearing box (106.02.40.06) was lost, causing the Jack Shaft Assy to be misaligned; the bearing box was slightly tilted, leading to uneven meshing between the jack shaft’s gears and the internal gear ring; the gear teeth were worn on one side. Root Cause: The shim was lost during a previous maintenance check, and no replacement was installed. Without the shim, the Jack Shaft Assy was not properly aligned, causing the gears to mesh unevenly. Over time, this uneven meshing led to gear wear, vibration, and noise. Solution: Replace the lost shim (106.02.40.07) with a genuine JC50D part, adjust the left bearing box to realign the Jack Shaft Assy, and ensure the gears mesh evenly. Replace the worn internal gear ring to prevent further damage to the Jack Shaft Assy. After maintenance, the vibration and clicking noise disappeared, and torque transmission became stable.

Case 4: Jack Shaft Oil Leakage & Oil Hub Failure

Fault Phenomenon: Lubricating oil leaked continuously from the left side of the Jack Shaft Assy 106.49.40.00, specifically from the oil hub (106.49.40.03). The oil level in the left bearing box dropped rapidly, requiring frequent oil top-ups, and there was oil residue on the surrounding components. On-Site Inspection: The left oil hub (106.49.40.03) was cracked, causing oil to leak; the felt seal (D3-1-67) around the oil hub was aged and hard, unable to form a tight seal; the oil hub’s mounting bolts were loose. Root Cause: The oil hub was damaged by accidental impact during equipment moving, and the loose bolts allowed additional stress on the hub, worsening the crack. The aged felt seal could not prevent oil from leaking through the crack, leading to continuous oil loss. Solution: Replace the cracked left oil hub (106.49.40.03) and aged felt seal with genuine JC50D parts. Tighten the oil hub’s mounting bolts to the standard torque and add new lubricating oil to the left bearing box. After replacement, the oil leakage stopped completely, and the Jack Shaft Assy remained properly lubricated during operation.

FAQ (Frequently Asked Questions)

Procurement Guide

All listed parts are exclusively engineered for the Lanzhou LS Drawworks JC50D, with a focus on the core Jack Shaft Assy 106.49.40.00, and strictly adhere to API Spec 7K, GB national standards (GB5782-86, GB93-87, GB283-87, etc.), and Lanzhou LS’s original design specifications. These parts are precision-manufactured to match the JC50D’s 3150kN maximum hook load and 2800-5000m drilling depth range, ensuring reliable performance, perfect compatibility, and maximum safety in harsh onshore drilling environments. Whether you need to purchase the Jack Shaft Assy 106.49.40.00, sprockets, bearings, gears, seals, fasteners, or any other JC50D-compatible component, we provide 100% genuine parts that undergo rigorous quality testing—including dimensional checks, material testing, torque load testing, and assembly compatibility verification—before leaving the factory. Beyond just supplying parts, we offer comprehensive support: we provide on-site fault troubleshooting guidance for the Jack Shaft Assy and all matching components, maintenance training tailored to the JC50D’s design, and part number verification to ensure you get the right part every time. We also offer compatible parts for crown blocks, travelling blocks, hooks, swivels, rotary tables, and mud pumps, giving you a convenient one-stop solution for all your drilling equipment part needs. Choosing our genuine parts eliminates the safety risks of non-genuine, mismatched components, reduces downtime, extends the service life of your JC50D drawworks, and protects your investment and on-site personnel. Contact us today to discuss your procurement needs, obtain accurate product specifications, verify part numbers, or access professional technical support. We are committed to providing you with high-quality, genuine parts and reliable service to keep your Lanzhou LS Drawworks JC50D and drilling operations running smoothly.

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