Product Introduction
This series of replacement parts covers all core matching components of the LSNOI 3NB-1600 mud pump crank shaft assembly, including main bearing end caps, left & right bearing cages, high-strength bolts, locking wires, multi-specification outer retaining ring gaskets, head hole bolts, inner & outer race retainers, heavy-duty special bearings, spacers, connecting rods, left & right-hand gears, nuts, split pins, end cap gaskets, washers, snap rings, inner-hexagon screws and precision adjustment shims of varying thicknesses. Every part is made of high-strength wear-resistant alloy steel, high-load bearing materials and precision-machined sealing gaskets, processed by CNC precision machining to ensure perfect fit with original assembly interfaces, requiring no on-site modification, grinding or secondary processing. The parts are designed for standardized disassembly and assembly, suitable for daily routine inspection, periodic maintenance, emergency fault repair and full power end overhaul.
Core Functional Specifications
Each component is engineered to withstand extreme heavy-load drilling site operating conditions, with clear authoritative performance indicators to ensure stable and safe field operation:
- Heavy-Load Torsional Resistance: The integral forged crank shaft supports stable transmission of 1600HP rated power, with ultra-high torsional strength and no deformation or fracture under continuous heavy load and impact.
- Bearing Load Performance: Custom heavy-duty cylindrical roller bearings support ultra-high radial and axial loads, with low friction coefficient and excellent heat dissipation performance, avoiding high-temperature burnout under long-term operation.
- Stable Gear Transmission: Precision-machined left and right-hand gears achieve perfect meshing, with low noise, stable transmission and no tooth surface abrasion under high-speed rotation.
- Anti-Loosening & Sealing Performance: 12.9-grade high-strength fasteners matched with locking wires and split pins maintain stable locking torque; precision gaskets and snap rings realize reliable sealing, preventing lubricating oil leakage and external dust intrusion.
- Clearance Adjustment Accuracy: Multi-thickness precision shims enable accurate adjustment of bearing and retainer assembly clearance, ensuring optimal operation clearance and prolonging component service life.
Structural Design Features
These crank shaft assembly parts prioritize heavy-load durability, stable transmission and convenient on-site maintenance, fully adapting to harsh oilfield drilling and construction environments:
- Integral Forged Crank Shaft Design: The crank shaft adopts integral alloy steel forging with precision grinding processing, featuring uniform stress distribution, high torsional resistance and strong fatigue resistance, adapting to long-term heavy-load reciprocating transmission.
- Modular Bearing & Retainer Structure: Split-type inner and outer race retainers realize stable bearing positioning, avoiding bearing displacement under high load and reducing friction wear.
- Precision Clearance Adjustment System: A complete set of thin-wall shims of different thicknesses (δ0.05/δ0.1/δ0.2/δ0.25/δ5) supports micro-adjustment of assembly clearance, meeting strict API assembly standards.
- Reinforced Fastening Design: Multi-specification high-strength bolts and matching fasteners with dual anti-loosening designs (locking wires + split pins) effectively prevent fastener loosening under long-term strong vibration.
- Independent Connecting Rod Structure: Precision-machined connecting rods realize stable power conversion, with uniform stress and no eccentric wear during reciprocating motion.
Applicable Operating Conditions
This series of crank shaft assembly parts performs stably in various harsh heavy-load drilling scenarios, with strong environmental adaptability:
- Onshore Deep-Well Drilling: Land deep-well rigs, desert drilling platforms, mountain and frozen soil drilling sites, adapting to 24-hour continuous heavy-load operation, large temperature differences and dust erosion.
- Offshore Drilling Operations: Offshore platforms and jack-up drilling rigs, resisting salt spray corrosion, high humidity and continuous wave-induced vibration without performance degradation.
- Heavy-Load Continuous Operation: Adapting to long-term full-load power transmission, withstanding frequent instantaneous load impact and high-frequency torsional stress.
- Standard Lubrication System Environments: Suitable for conventional mud pump gear lubricating oil systems, with sealing components resistant to oil corrosion and long service life.
- We supply the following spare parts:
| 107.11.20.00 Crank Shaft Assembly | ||
| Item No. | Part No. | Description |
| 201 | 107.11.24.00 | Cap, main bearing end |
| 202 | 107.11.20.23-1 | Left-bearing cage |
| 203 | 107.11.20.08 | Bolt M20x50 |
| 204 | Wire φ2 | |
| 205 | 107.11.20.17 | Outer retaining ring gasket δ0.25 |
| 206 | 107.11.20.18 | Outer retaining ring gasket δ0.2 |
| 207 | 107.11.20.19 | Outer retaining ring gasket δ0.1 |
| 208 | 107.11.20.15 | Head hole bolt M30x50 |
| 209 | 107.11.20.10 | Inner race retainer |
| 210 | 3003776QU1Y | Main φ380xφ620×194 |
| 211 | 107.11.20.09 | Outer race retainer |
| 212 | 107.11.20.16 | Spacer |
| 214 | 107.11.20.29 | Head hole bolt M20x165 |
| 215 | 107.11.22.00 | Retainer |
| 216 | 107.11.20.30 | Gasket δ0.25 |
| 217 | 107.11.20.31 | Gasket δ0.10 |
| 218 | 107.11.20.32 | Gasket δ0.05 |
| 219 | 229/723Qu | Bearing φ723.795xφ908.65×120.65 |
| 220 | 107.11.20.01 | Left-hand gear |
| 221 | 107.11.20.02 | Right-hand gear |
| 222 | 107.11.20.03 | Bolt M30x170 |
| 223 | 107.11.20.04 | Nut M30 |
| 224 | GB91-86 | Split pin 6×60 |
| 225 | 107.11.20.05-1 | Gasket of end cap δ8 |
| 226 | GB5783-86 | Bolt M20x50 |
| 227 | GB97.1-85 | Washer 20 |
| 228 | GB93-87 | Washer 20 |
| 229 | 107.11.20.07-1 | Right-bearing cage |
| 231 | 107.11.21.00 | Crank shaft |
| 232 | 107.11.20.11 | Shim for retainer plate δ5 |
| 233 | 107.11.20.12 | Shim for retainer plate δ0.25 |
| 234 | 107.11.20.13 | Shim for retainer plate δ0.2 |
| 235 | 107.11.20.14 | Shim for retainer plate δ0.1 |
| 237 | 107.11.20.22 | Snap ring |
| 238 | 107.11.20.43 | Inner-hexagon screw M16x90 |
| 239 | 107.11.20.21 | Retainer |
| 240 | 107.11.20.20 | Connecting rod |
On-Site Fault Repair Case Studies
Case 1: Heavy-Duty Bearing Burnout Causing Abnormal Vibration
A land deep-well rig’s LSNOI 3NB-1600 mud pump experienced severe abnormal vibration and local overheating at the power end. On-site inspection revealed that the main heavy-duty bearing (3003776QU1Y) was burned out due to long-term heavy-load operation and insufficient lubrication. Maintenance personnel replaced the damaged bearing, matching inner and outer race retainers, replenished qualified lubricating oil, and eliminated abnormal vibration and temperature rise completely.
Case 2: Loose High-Strength Bolts Triggering Gear Misalignment
An offshore drilling site’s 3NB-1600 mud pump showed abnormal gear meshing noise and unstable power transmission. Long-term strong vibration caused multiple head hole bolts (M30x50) to loosen, leading to gear position deviation. Technicians re-tightened all bolts to standard torque, replaced damaged locking wires and split pins, and restored stable gear meshing.
Case 3: Worn Gasket Causing Lubricating Oil Leakage
A drilling team’s 3NB-1600 mud pump had serious lubricating oil leakage at the main bearing end cap. Long-term oil corrosion and temperature changes caused the end cap gasket (δ8) to age and lose sealing performance. Workers removed the damaged gasket, cleaned the mounting surface, installed a new OEM-standard gasket, and completely stopped oil leakage.
Frequently Asked Questions (FAQ)
| Question | Answer |
| Are these crank shaft parts exclusively compatible with LSNOI 3NB-1600 mud pump? | Yes, all parts in this catalog are precisely designed to match the LSNOI Lanzhou LS 3NB-1600 mud pump crank shaft assembly (107.11.20.00), with OEM-standard dimensions and perfect interface fitting, no on-site modification required for installation. |
| What is the recommended replacement cycle for main bearings and gears? | Under standard heavy-load drilling conditions, main bearings and gears are recommended to be replaced every 4000-4500 working hours; in harsh continuous full-load operation environments, shorten the replacement cycle to 3500-4000 working hours to avoid sudden failures. |
| How to adjust crank shaft assembly clearance correctly? | Use the matching multi-specification precision shims (δ0.05/δ0.1/δ0.2/δ0.25/δ5) for micro-adjustment, and control the standard assembly clearance within 0.12-0.20mm to ensure optimal bearing and gear operation. |
Procurement Guidance
This LSNOI 3NB-1600 mud pump crank shaft assembly parts list is a professional and reliable reference for oilfield drilling equipment management, power end transmission system maintenance and spare parts procurement teams, providing standardized, high-strength and heavy-load resistant spare parts solutions for daily routine maintenance, periodic overhaul and spare parts inventory preparation. Using these OEM-standard replacement parts can effectively avoid the risks of poor fitting, insufficient strength and short service life caused by non-standard parts, quickly resolve common power end transmission faults, and ensure stable and efficient operation of mud pump equipment.
