Product Introduction
This series covers all core replacement parts of the LSNOI 3NB-1600 mud pump crank shaft assembly, including integral forged crank shaft, heavy-duty special main bearings, left and right-hand gears, left and right bearing cages, main bearing end caps, connecting rods, various high-strength bolts, locking wires, split pins, inner and outer race retainers, spacers, snap rings, multi-thickness gaskets and shims, washers and other accessories. Each part is made of oil-grade wear-resistant and high-strength materials, processed by precision CNC machining and overall heat treatment, achieving 100% direct interchangeability with original assembly parts, without on-site modification, grinding or secondary processing, suitable for daily inspection, routine maintenance and comprehensive overhaul of the crank shaft assembly.
Core Function Specifications
Every part in this crank shaft assembly parts list is built to adapt to harsh heavy-duty drilling conditions, with clear and reliable performance indicators:
- High-torque Power Transmission: The integral forged crank shaft and precision gears stably transmit 1600HP rated power, with no torsional deformation under full load.
- Heavy-duty Load Bearing: Special industrial main bearings stably bear high-frequency cyclic load, with a service life of up to 8000 working hours under standard operating conditions.
- Precise Assembly Positioning: Multi-specification shims and spacers realize accurate adjustment of assembly clearance, ensuring stable operation of the crank shaft without axial movement.
- Anti-loosening Locking: High-strength bolts, split pins and locking wires form a dual anti-loosening structure, avoiding fastener loosening caused by long-term strong vibration.
- Stable Sealing & Positioning: Custom gaskets and retainers ensure internal lubrication sealing and axial positioning of bearings, preventing lubricating oil leakage and bearing displacement.
Structural Characteristics
These crank shaft assembly parts adopt an optimized structure suitable for oilfield field maintenance and long-term durable operation:
- Integral Forging Structure: The crank shaft is forged from integral alloy steel, with high torsional strength and fatigue resistance, avoiding fracture under heavy load.
- Modular Bearing Design: Split bearing cages and independent bearing retainers facilitate quick disassembly and replacement of bearings, simplifying overhaul operations.
- Adjustable Clearance Shim System: Multi-thickness shims are used to adjust the retainer plate clearance, compensating for component wear and prolonging service life.
- Reinforced Gear Connection: High-strength bolts and locking structures fix the left and right-hand gears firmly, ensuring stable gear meshing without slipping.
- Standardized Fastener Configuration: Unified thread specifications and positioning structures ensure easy installation and high compatibility of accessories.
Maintenance and Upkeep Suggestions
To ensure the stable operation of the crank shaft assembly and prolong its service life, follow these field-proven maintenance specifications:
- Daily Inspection: Monitor the operating temperature of the bearing (normal temperature ≤75℃), check for abnormal noise and vibration, and observe whether there is lubricating oil leakage.
- Weekly Maintenance: Check the tightness of all high-strength bolts, inspect the integrity of locking wires and split pins, and check the quality of lubricating oil.
- Monthly Inspection: Measure the axial clearance of the crank shaft, check the gear meshing wear, and check the aging of gaskets.
- Regular Overhaul: Replace worn bearings and gaskets every 12 months, calibrate the assembly clearance with matching shims, and replace severely worn connecting rods.
- Storage Requirements: Store precision parts in a dry and dust-free environment, apply anti-rust oil on metal surfaces, and avoid collision damage to the crank shaft journal and gears.
- 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 δ 0.25 |
| 206 | 107.11.20.18 | Outer retaining ring gasket δ 0.2 |
| 207 | 107.11.20.19 | Outer retaining ring gasket δ 0.1 |
| 208 | 107.11.20.15 | Head hole bolt M30x50 |
| 209 | 107.11.20.10 | Inner race retainer |
| 210 | 3003776QU1Y | Main Φ380x Φ 620×194 |
| 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 δ 0.25 |
| 217 | 107.11.20.31 | Gasket δ 0.10 |
| 218 | 107.11.20.32 | Gasket δ 0.05 |
| 219 | 229/723Qu | Bearing Φ723.795x Φ908.65×120.65 |
| 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 δ 8 |
| 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 δ 5 |
| 233 | 107.11.20.12 | Shim for retainer plate δ 0.25 |
| 234 | 107.11.20.13 | Shim for retainer plate δ 0.2 |
| 235 | 107.11.20.14 | Shim for retainer plate δ 0.1 |
| 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 Cases
Case 1: Bearing Burnout Caused by Poor Lubrication
A 3NB-1600 mud pump had sudden abnormal noise and rapid temperature rise on the construction site, and the bearing temperature exceeded 90℃. The main bearing (3003776QU1Y) was burned out due to lubricating oil blockage. Maintenance personnel replaced the damaged bearing, cleaned the lubrication channel, readjusted the assembly clearance with matching shims, and the equipment resumed normal operation.
Case 2: Crank Shaft Axial Movement Triggered by Loose Retainer
The crank shaft of the mud pump had obvious axial movement, resulting in unstable gear meshing and abnormal transmission. The inner and outer race retainers were loose, and the positioning gasket was worn. Workers replaced the worn gasket, reinstalled and fastened the retainer, readjusted the axial clearance, and eliminated the fault.
Case 3: Fastener Loosening Caused Gear Abnormal Wear
After long-term operation, the left-hand gear of the crank shaft showed severe wear and abnormal meshing sound. The high-strength bolts fixing the gear were loose under long-term vibration. Maintenance personnel retightened the bolts to the standard torque, installed new split pins for locking, and replaced the slightly worn gear to restore normal transmission.
Frequently Asked Questions (FAQ)
| Question | Answer |
| Are these parts fully compatible with LSNOI 3NB-1600 mud pump crank shaft assembly? | Yes, all parts in this list are specially designed for LSNOI Lanzhou LS 3NB-1600 mud pump crank shaft assembly (107.11.20.00), completely matching OEM dimensions, material standards and installation requirements, with 100% direct interchangeability. |
| What is the normal axial clearance range of the crank shaft assembly? | The standard axial clearance of the crank shaft is 0.10-0.20mm, and the clearance can be accurately adjusted by selecting matching thickness shims to ensure stable operation. |
| What is the standard tightening torque of M30 high-strength bolts? | According to API 7K industry standards, the tightening torque of M30 bolts is 850N·m, and a calibrated torque wrench should be used for uniform tightening to ensure locking effect. |
Procurement Guidance
This LSNOI 3NB-1600 mud pump crank shaft assembly parts list is a professional and reliable reference for oilfield equipment maintenance and spare parts procurement teams, providing clear and accurate part selection standards for daily maintenance, regular overhaul and emergency fault repair. All supplied parts undergo strict dimensional inspection, heat treatment quality testing and load performance testing, fully complying with API 7K industry standards and original equipment quality requirements, with ultra-high wear resistance, load-bearing capacity and stability.
