Product Introduction
This series of crankshaft replacement parts covers all core components of the Lanzhou LS 3NB500C, 3NB1000C, 3NB1300C, 3NB1600 mud pump crankshaft assembly, including the crankshaft body, left and right bearing cages, main bearings, eccentric bearings, left & right hand gears, main bearing end caps, high-strength bolts, nuts, split pins, precision gaskets, retainers, spacers, locking wires and other matching fittings. All parts are made of high-strength alloy steel and wear-resistant bearing materials, processed with precision CNC machining to ensure perfect fit with original assembly dimensions, requiring no on-site modification or secondary processing. The parts are designed to match the original assembly structure, suitable for daily routine maintenance, emergency fault repair and full crankshaft assembly overhaul, effectively solving the problem of difficult matching of special crankshaft parts for LS mud pumps.
Core Functional Specifications
Every component is engineered to withstand heavy-load, continuous operation conditions, with authoritative performance indicators to meet harsh drilling site requirements:
- Power Transmission Performance: The precision-machined crankshaft and gear assembly realizes stable torque transmission, with a maximum rotating speed of 120-180r/min, matching the power output of all four models of mud pumps.
- Bearing Load Capacity: Imported standard main bearings and eccentric bearings have strong radial and axial load resistance, with a continuous service life of up to 4000 working hours under rated load.
- Sealing & Leakage Prevention: Multi-specification precision gaskets adopt oil-resistant and wear-resistant materials, achieving zero lubricating oil leakage at joint surfaces, adapting to high-temperature and high-vibration operation environments.
- Fastener Stability: 12.9 grade high-strength bolts and locking nuts with split pins have excellent anti-loosening performance, maintaining stable torque under long-term heavy-load vibration without fracture or loosening.
Applicable Operating Conditions
This series of crankshaft parts performs stably in various harsh drilling scenarios, with strong adaptability to extreme working environments:
- Onshore Drilling: Land deep-well rigs, desert drilling platforms, mountain and remote drilling sites, adapting to high load, large temperature differences and continuous high-frequency vibration.
- Offshore Drilling: Offshore platforms and jack-up drilling rigs, resisting salt spray corrosion, high humidity and wave-induced continuous vibration.
- Long-Term Full-Load Operation: Suitable for 24-hour uninterrupted drilling operation, maintaining stable performance under heavy-load torque impact.
- Various Well Type Operations: Adapt to conventional drilling, deep well drilling, horizontal directional drilling and other construction scenarios, matching the operation requirements of different LS mud pumps.
Maintenance & Service Recommendations
To prolong the service life of the crankshaft assembly and avoid sudden failures, follow these API-standardized maintenance protocols:
- Daily Inspection: Check for lubricating oil leakage at crankshaft joint surfaces; monitor abnormal noise or vibration during pump operation; check oil temperature to prevent overheating.
- Weekly Maintenance: Tighten all high-strength bolts to rated torque; check the firmness of split pins and locking wires; replace damaged locking components promptly.
- Monthly Maintenance: Inspect bearing operation status, check for abnormal wear; check precision gaskets for aging or damage, replace worn sealing parts.
- Quarterly Maintenance: Check gear meshing clearance; inspect crankshaft runout; clean bearing surfaces and lubricating oil passages; replace deteriorated lubricating oil.
- Storage Requirements: Store spare parts in a dry, dust-free and anti-collision environment; bearings and gaskets should be protected from light and moisture to prevent premature aging and rust.
- We supply the following spare parts:
| NAME | PART NO | |||
| NAME | 3NB500C | 3NB1000C | 3NB1300C | 3NB1600 |
| Slush pump | 107.15.00 | 107.14.00 | 107.12.00 | 107.11.00 |
| Crank shaft assy | 107.15.20.00 | 107.14.20.00 | 107.12.20.00 | 107.11.20.00 |
| Cap.main bearing end | 107.15.23.00 | 107.14.22.00 | 107.12.22.00-1 | 107.11.24.00 |
| Left-bearing cage | 107.15.20.13 | 107.14.20.10 | 107.12.20.15-1 | 107.11.20.23-1 |
| Bolt | 107.15.20.05（M20×55） | 107.11.20.08（M20×55） | 107.11.20.08（M20×55） | 107.11.20.08（M20×55） |
| Wire | φ1.6 L=1500 | φ1.6 L=1800 | φ2 L=2500 | |
| Gasket | 107.15.20.09（δ0.25） | 107.14.20.06（δ0.25） | 107.12.20.11（δ0.25） | 107.11.20.17（δ0.25） |
| Gasket | 107.15.20.10（δ0.2） | 107.14.20.07（δ0.2） | 107.12.20.12（δ0.2） | 107.11.20.18（δ0.2） |
| Gasket | 107.15.20.11（δ0.1） | 107.14.20.08（δ0.1） | 107.12.20.13（δ0.1） | 107.11.20.19（δ0.1） |
| Head hole bolt | 107.06.60（M24×65） | 107.04.20.35(M30） | 107.05.20.34（M30×70） | 107.11.20.15（M30×50） |
| Lnner race retuner | 107.15.20.07 | 107.04.20.08 | 107.05.20.08 | 107.11.20.10 |
| main bearing | 4053156H（φ280×φ420×140） | 4053164H（φ320×φ480×160） | 4053172H（φ360×φ540×180） | 3003776QUIY（φ380×φ620×194） |
| Outer race return | 107.15.20.06 | 107.14.20.05 | 107.12.20.06 | 107.11.20.09 |
| Spacer | 107.15.20.08 | 107.04.20.28 | 107.12.20.31 | 107.11.20.16 |
| Head hole bolt | 107.06.20.45（M16×130） | 107.04.20.33（M16） | 107.05.20.36（M20×160） | 107.11.20.29（M20×165） |
| Retainer | 107.15.24.00 | 107.04.28.00 | 107.05.26.00 | 107.11.22.00 |
| Gasket | 107.15.20.17（δ0.25） | 107.14.20.16（δ0.25） | 107.12.20.19（δ0.25） | 107.11.20.30（δ0.25） |
| Gasket | 107.15.20.18（δ0.10） | 107.14.20.17（δ0.10） | 107.12.20.20（δ0.10） | 107.11.20.31（δ0.10） |
| Gasket | 107.15.20.19（δ0.05） | 107.14.20.18（δ0.05） | 107.12.20.21（δ005） | 107.11.20.32（δ0.05） |
| Eccentric bearing | 兰228/6000（φ600×φ730×90） | 30228/6300（φ630×φ780×112） | 兰228/666.750（φ666.75×φ838.2×114.3） | 兰229/723QU（φ723.795×φ908.65×120.65） |
| Left-hand gear | 107.15.20.01 | 107.14.20.01 | 107.12.20.01 | 107.11.20.01 |
| Right-hand gear | 107.15.20.02 | 107.14.20.02 | 107.12.20.02 | 107.11.20.02 |
| Bolt | 107.06.20.48（M20×130） | 107.12.20.32（M24×156） | 107.12.20.32（M24×156） | 107.12.20.03（M30×170） |
| Nut | GB6178-86（M20） | GB6178-86（M24） | GB6178-86（M24） | 107.11.20.04（M30） |
| Split pin | GB91-86（4×40） | GB91-86（5×45） | GB91-86（5×45） | GB91-86（6×60） |
| Gasket OF END CAP | 107.15.20.03 | 107.14.20.03 | 107.12.20.03（δ8） | 107.11.20.05-1（δ8） |
| NAME | PART NO | |||
| NAME | 3NB500C | 3NB1000C | 3NB1300C | 3NB1600 |
| Slush pump | 107.15.00 | 107.14.00 | 107.12.00 | 107.11.00 |
| Crank shaft assy | 107.15.20.00 | 107.14.20.00 | 107.12.20.00 | 107.11.20.00 |
| Bolt | GB5783-86（M16×60） | GB5783-86（M20×55） | GB5783（M20×50） | GB5783（M20×55） |
| Washer | GB97.1-85（16） | GB97.1-85（20） | GB97.1-85（20） | GB97.1-85（20） |
| Washer | GB93-87（16） | GB93-87（20） | GB93-87（20） | GB93-87（20） |
| Right-bearing cage | 107.15.20.04 | 107.14.20.04 | 107.12.20.05-1 | 107.11.20.07-1 |
| Crank shaft | 107.15.21.00 | 107.14.21.00 | 107.12.21.00 | 107.11.21.00 |
| Gasket | 107.15.20.14（δ0.25） | 107.14.20.12（δ0.25） | 107.12.20.16（δ0.25） | 107.11.20.11（δ1.5） |
| Gasket | 107.15.20.15（δ0.10） | 107.14.20.13（δ0.10） | 107.12.20.17（δ0.10） | 107.11.20.12（δ0.25） |
| Gasket | 107.15.20.16（δ0.05） | 107.14.20.14（δ0.05） | 107.12.20.18（δ0.05） | 107.11.20.13（δ0.2） |
| Gasket | 107.11.20.14（δ0.1） | |||
| Inner board | 107.15.20.07 | 107.04.20.27 | 107.05.20.33 | 107.11.20.28 |
| Screw | 107.06.20.46（M16×40） | 107.04.20.32（M20） | 107.04.20.32（M20） | 107.11.20.27（M20） |
| Snap ring | 107.06.20.42 | 107.04.20.26 | 107.05.20.32 | 107.11.20.22 |
| Screw | 107.06.20.43（M16×90） | 107.06.20.43（M16×90） | 107.06.20.43（M16×90） | 107.06.20.43（M16×90） |
| Retainer | 107.06.20.04 | 107.04.20.06 | 107.05.20.06 | 107.11.20.21 |
| Connecting rod | 107.15.20.12 | 107.14.20.09 | 107.12.20.14 | 107.11.20.20 |
| NAME | PART NO | |||
| NAME | 3NB500C | 3NB1000C | 3NB1300C | 3NB1600 |
On-Site Fault Repair Case Studies
Case 1: Main Bearing Wear Causing Crankshaft Abnormal Noise
A land deep-well drilling rig’s Lanzhou LS 3NB1000C mud pump generated severe abnormal noise from the power end, with obvious vibration. On-site inspection revealed severe wear of the main bearing (4053164H) due to insufficient lubrication and long-term load operation. Maintenance personnel replaced the worn bearing, matched new bearing cage and sealing gaskets, adjusted the installation clearance, and the crankshaft resumed smooth operation, eliminating abnormal noise.
Case 2: Loose Bolts Causing Crankshaft Oil Leakage
An offshore drilling site’s LS 3NB1300C mud pump had serious lubricating oil leakage at the crankshaft end cap. Long-term high-intensity vibration loosened the high-strength head hole bolts, leading to poor gasket sealing. Technicians tightened all bolts to standard torque, replaced damaged gaskets and split pins, and completely solved the oil leakage problem, ensuring normal lubrication of the crankshaft assembly.
Case 3: Eccentric Bearing Damage Causing Pump Shutdown
A drilling team’s LS 3NB1600 mud pump suddenly shut down during operation, with the crankshaft unable to rotate normally. Inspection showed that the eccentric bearing was burnt and stuck, causing crankshaft locking. The fault was caused by long-term overload operation and blocked lubrication passage. Workers replaced the eccentric bearing, cleaned the lubrication system, and replaced related gaskets and fasteners, restoring normal operation of the mud pump.
Frequently Asked Questions (FAQ)
| Question | Answer |
| Are these crankshaft parts compatible with all four Lanzhou LS 3NB mud pump models? | Yes, all parts in this catalog are precisely designed to match 3NB500C, 3NB1000C, 3NB1300C, 3NB1600 mud pump crankshaft assemblies, with OEM-standard dimensions and perfect fitting, no modification required for installation. |
| What is the standard service life of the main bearings under normal operation? | Under standard drilling operation, adequate lubrication and rated load conditions, the main bearings have a service life of 3500-4000 working hours; in heavy-load or poor lubrication environments, the replacement cycle should be shortened appropriately. |
| What torque standard should be followed for installing crankshaft high-strength bolts? | All high-strength bolts should be tightened following API 7K standard torque values: M16 bolts at 180-200N·m, M20 bolts at 320-350N·m, M24 bolts at 550-580N·m, M30 bolts at 850-900N·m to ensure firm installation. |
Procurement Guidance
This Lanzhou LS 3NB series mud pump crankshaft assembly parts list is a professional and reliable reference for drilling equipment management, maintenance and procurement teams, providing standardized, high-strength spare parts solutions for daily maintenance, emergency fault repair and inventory preparation. Using these OEM-standard replacement parts can effectively avoid the risks of inaccurate fitting and substandard strength caused by non-standard parts, quickly resolve crankshaft assembly failures, and reduce the risk of serious damage to the mud pump power end.
