Product Introduction
This complete series covers all core replacement parts for the LS-NOV 3NB-1300C mud pump crank shaft assembly, including the integral forged crank shaft, left and right bearing cages, main heavy-duty bearings, connecting rods, left and right drive gears, bearing end caps, inner and outer race retainers, precision adjustment shims and gaskets, high-strength bolts, nuts, split pins, locking wires, snap rings, and washers. Every part is forged from oilfield-grade high-strength alloy steel, processed via precision CNC machining and integral heat treatment, achieving 100% direct interchangeability with original crank shaft assembly components, requiring no on-site modification, grinding, or secondary processing, and suitable for routine maintenance, partial component replacement, and full power end overhaul.
Core Function Specifications
Every component in this crank shaft assembly parts lineup is designed to withstand extreme heavy-duty drilling conditions, with verified authoritative performance indicators:
- High-Torque Power Transmission: The forged crank shaft and matched gears stably transfer 1300HP rated power, with zero power loss and smooth mechanical transmission.
- Heavy-Load Bearing Support: Industrial-grade large-diameter main bearings support extreme radial and cyclic loads, eliminating premature bearing burnout under continuous operation.
- Precision Clearance Adjustment: Multi-thickness shims and gaskets enable precise clearance calibration, reducing friction and extending component lifespan.
- Reliable Sealing & Retention: Custom retainers and end cap gaskets prevent lubricating oil leakage and lock bearing positions firmly under high vibration.
- Anti-Loosening Fastening: High-strength bolts with split pins and locking wires form a dual anti-loosening system, maintaining stable fastening under long-term mechanical vibration.
Structural Characteristics
These crank shaft assembly parts feature optimized structures for oilfield field maintenance and long-term durable operation:
- Integral Forged Crank Shaft: One-piece forged alloy steel construction with uniform stress distribution, eliminating shaft breakage risks under heavy cyclic loads.
- Split Bearing Cage Design: Independent left and right bearing cages simplify disassembly, installation, and bearing replacement, cutting maintenance time significantly.
- Precision Adjustment Shim System: Multi-specification thin shims allow micro-clearance adjustment, ensuring optimal gear meshing and bearing fit.
- Reinforced Connecting Rod Design: Heavy-duty connecting rods with high fatigue resistance, matching the crank shaft’s reciprocating motion stably.
- Standardized Fastening System: Unified high-strength fasteners with universal compatibility, streamlining spare parts stocking and on-site replacement.
Applicable Working Conditions
All crank shaft assembly parts adapt to the harshest oilfield drilling scenarios matching the LS-NOV 3NB-1300C mud pump:
- Heavy-Load Continuous Drilling: 24-hour uninterrupted onshore drilling, workover, and deep-well operations, supporting full-load power transmission.
- High-Cyclic-Stress Environment: Resists continuous reciprocating cyclic stress and heavy radial loads generated by power end operation.
- Harsh Outdoor Environments: Desert, mountain, cold, and high-temperature drilling platforms, adapting to ambient temperatures ranging from -40℃ to 75℃.
- High-Vibration Operation Conditions: Withstands strong mechanical vibration from the mud pump and supporting equipment without fastener loosening.
We supply the following spare parts:
| 107.12.20.00 Crank Shaft Assembly | ||
| Item No. | Part No. | Description |
| 201 | 107.12.22.00-1 | Cap, main bearing end |
| 202 | 107.12.20.15-1 | Left-bearing cage |
| 203 | 107.11.20.08 | Bolt M20x50 |
| 204 | Wire φ1.6 L=1800M | |
| 205 | 107.12.20.11 | Outer retaining ring gasket δ0.25 |
| 206 | 107.12.20.12 | Outer retaining ring gasket δ0.2 |
| 207 | 107.12.20.13 | Outer retaining ring gasket δ0.1 |
| 208 | 107.05.20.34 | Head hole bolt M30x50 |
| 209 | 107.05.20.08 | Inner race retainer |
| 210 | 4053172H | Main φ360xφ540×180 |
| 211 | 107.12.20.06 | Outer race retainer |
| 212 | 107.12.20.31 | Spacer |
| 214 | 107.05.20.36 | Head hole bolt M20x165 |
| 215 | 107.05.26.00 | Retainer |
| 216 | 107.12.20.19 | Gasket δ0.25 |
| 217 | 107.12.20.20 | Gasket δ0.10 |
| 218 | 107.12.20.21 | Gasket δ0.05 |
| 219 | 228/666.75Q | Bearing φ666.75xφ838.2×114.3 |
| 220 | 107.12.20.01 | Left-hand gear |
| 221 | 107.12.20.02 | Right-hand gear |
| 222 | 107.12.20.32 | Bolt M24x156 |
| 223 | GB6178-86 | Nut M24 |
| 224 | GB91-86 | Split pin 5×45 |
| 225 | 107.12.20.03 | Gasket of end cap δ8 |
| 226 | GB5783-86 | Bolt M20x50 |
| 227 | GB97.1-85 | Washer 20 |
| 228 | GB93-87 | Washer 20 |
| 229 | 107.12.20.05-1 | Right-bearing cage |
| 231 | 107.12.21.00 | Crank shaft |
| 232 | 107.12.20.16 | Shim for retainer plate δ0.25 |
| 233 | 107.12.20.17 | Shim for retainer plate δ0.10 |
| 234 | 107.12.20.18 | Shim for retainer plate δ0.05 |
| 237 | 107.05.20.32 | Snap ring |
| 238 | 107.06.20.43 | Inner-hexagon screw M16x90 |
| 239 | 107.05.20.06 | Retainer |
| 240 | 107.12.20.14 | Connecting rod |
On-site Fault Repair Cases
Case 1: Bearing Burnout Caused by Excessive Clearance
The mud pump power end overheated rapidly and emitted harsh abnormal noise, forcing an emergency shutdown. The main bearing suffered burnout due to improper clearance and insufficient lubrication. Maintenance staff replaced the damaged bearing, installed precision adjustment shims to recalibrate clearance, and restored normal operation after lubrication system inspection.
Case 2: Oil Leakage Due to Damaged End Cap Gasket
Large-scale lubricating oil leakage occurred at the main bearing end cap, leading to insufficient oil level and accelerated component wear. The thick end cap gasket aged and deformed, losing its sealing performance. Workers replaced the matched gasket, retightened fastening bolts evenly, and completely eliminated the oil leakage fault.
Case 3: Loose Fasteners Triggering Abnormal Vibration
The crank shaft assembly produced severe abnormal vibration, with visible shifting of the bearing cage. High-strength fixing bolts loosened under long-term cyclic vibration, losing clamping force. Technicians replaced fatigued bolts and nuts, reinstalled split pins and locking wires, and retightened all fasteners to standard torque.
Frequently Asked Questions (FAQ)
| Question | Answer |
| Are these parts fully compatible with LS-NOV 3NB-1300C mud pump crank shaft assembly? | Yes, all parts in this list are custom-designed for theLS-NOV 3NB-1300C mud pump crank shaft assembly (107.12.20.00), fully matching OEM dimensions, material standards, and installation requirements with 100% direct interchangeability. |
| What is the normal operating temperature range for the crank shaft assembly? | The normal continuous operating temperature for the crank shaft and main bearings is ≤75℃; temperatures exceeding this indicate insufficient lubrication or excessive clearance issues. |
| How to adjust the bearing clearance using matched shims? | Use the provided δ0.05, δ0.10, and δ0.25 precision shims to fine-tune clearance, keeping the standard bearing clearance within 0.12-0.18mm for optimal performance and service life. |
Procurement Guidance
This LS-NOV 3NB-1300C mud pump crank shaft assembly parts list serves as a professional, reliable reference for oilfield equipment maintenance and spare parts procurement teams, providing clear, accurate part selection and procurement standards for routine maintenance, partial component replacement, and full power end overhaul. All supplied parts undergo strict dimensional verification, load-bearing performance testing, and fatigue resistance testing, fully complying with API 7K industry standards and original equipment quality requirements, with ultra-high strength, fatigue resistance, and operational stability.
