Product Introduction
This series covers all core replacement parts for the LS-NOV 3NB-1300C mud pump pinion shaft & crosshead assembly, including the main pinion shaft, left and right drive gears, left/right/middle crossheads, crosshead pins, high-precision rolling bearings, bearing cages and covers, oil seals, bushes, oil boxes, various gaskets and shims, locking keys, high-strength bolts, washers, pin retainers and locking wires. Each part is forged from oilfield-grade wear-resistant, fatigue-resistant and impact-resistant materials, processed by precision CNC machining and heat treatment, achieving 100% direct interchangeability with original assembly components, requiring no on-site modification, grinding or secondary processing, suitable for routine maintenance, partial component replacement and full power end overhaul.
Core Function Specifications
Every component in this pinion shaft & crosshead parts lineup is engineered to withstand harsh heavy-load drilling conditions, with verified authoritative performance indicators:
- High-Torque Power Transmission: Precision-matched gears and pinion shaft stably transmit 1300HP rated power, with zero power loss and smooth gear meshing.
- Accurate Motion Conversion: Crosshead assemblies complete stable rotation-to-reciprocating motion conversion, with minimal radial runout and high motion precision.
- Heavy-Load Bearing Capacity: High-precision heavy-duty bearings and bearing cages withstand extreme radial and impact loads, avoiding premature burnout.
- Reliable Lubrication Sealing: Custom oil seals and oil boxes realize closed lubrication, preventing lubricating oil leakage and external mud intrusion.
- Stable Anti-Loosening Fixation: High-strength bolts and locking wires form a dual anti-loosening structure, maintaining firm fastening under strong vibration.
Applicable Working Conditions
All pinion shaft & crosshead assembly parts adapt to various harsh oilfield drilling scenarios matching the LS-NOV 3NB-1300C mud pump:
- Heavy-Load Drilling Operations: Onshore deep well, conventional drilling and workover operations, adapting to 24-hour uninterrupted heavy-load operation.
- High-Friction Drive Environment: Suitable for continuous high-speed rotation and reciprocating motion working conditions of the power end.
- Harsh Outdoor Environments: Desert, mountain, cold and hot region drilling platforms, adapting to ambient temperatures ranging from -40℃ to 75℃.
- High-Vibration Working Conditions: Resistant to strong mechanical vibration and periodic impact load generated by mud pump operation.
Maintenance and Upkeep Suggestions
To ensure stable operation of the pinion shaft & crosshead assembly and prolong service life, follow these field-proven maintenance protocols:
- Daily Inspection: Monitor gear and bearing operating temperature (normal ≤75℃), check oil seal for lubricating oil leakage, listen for abnormal meshing noise.
- Weekly Maintenance: Retighten all high-strength bolts to standard torque, check locking wire integrity, inspect crosshead surface wear.
- Monthly Inspection: Check gear tooth abrasion degree, measure bearing clearance, adjust shim thickness to control assembly clearance.
- Regular Overhaul: Replace oil seals, gaskets and worn shims every 8 months, inspect crosshead pin wear annually, replace fatigued bearings.
- Storage Requirements: Store precision bearings in a dry, dust-free environment; apply anti-rust oil on gear and shaft surfaces, avoid collision damage to mating surfaces.
We supply the following spare parts:
| 107.12.10.00 Pinion Shaft & Crosshead Assembly | ||
| Item No. | Part No. | Description |
| 401 | 107.12.20.22 | Left-hand crosshead |
| 402 | 107.12.20.38 | Bolt M20x60 |
| 403 | Wire φ2 L=1800 | |
| 404 | 107.05.20.17-1 | Pin retainer |
| 405 | CG154836HU | Bearing φ180xφ280×219 |
| 406 | 107.12.20.26 | Oil conductor φ20×2 L=25 |
| 407 | 107.12.10.01 | Bush |
| 408 | 107.12.10.02 | Bearing cover |
| 409 | D7-1-67 | Oil seal 240x280x18 |
| 410 | 32844HU1 | Bearing φ220xφ350×98.4 |
| 411 | 107.12.10.07 | Bearing cage |
| 412 | 107.12.10.08 | Gasket δ1 |
| 413 | GB32.1-88 | Bolt M16x30 |
| 414 | Wire φ12, L=1500 | |
| 415 | 107.12.11.00 | Oil box |
| 416 | 107.12.10.09 | Shaft |
| 417 | 107.12.10.10 | Right-hand gear |
| 418 | GB1096-97 | Key (45X250) |
| 419 | 107.10.10.11 | Left-hand gear |
| 420 | 107.12.10.06 | Gasket δ2 |
| 421 | 107.12.10.03 | Gasket δ1 |
| 422 | 107.12.10.04 | Gasket δ0.5 |
| 423 | 107.12.10.05 | Gasket δ0.4 |
| 424 | GB5783-86 | Bolt M20x50 |
| 425 | GB93-87 | Washer 20 |
| 426 | 107.05.10.09 | Key 44.45×381 |
| 427 | 107.12.20.27 | Shim for pin retainer, δ2 |
| 428 | 107.12.20.28 | Shim for pin retainer , δ1 |
| 429 | 107.12.20.29 | Shim for pin retainer , δ0.5 |
| 430 | 107.12.20.30 | Shim for pin retainer , δ0.25 |
| 431 | 107.05.20.16 | Crosshead pin |
| 432 | 107.12.20.23 | Outer retainer |
| 433 | 107.05.20.18 | Inside retainer |
| 434 | 107.12.20.24 | Right, middle-hand crosshead |
On-site Fault Repair Cases
Case 1: Bearing Burnout Caused by Insufficient Lubrication
The mud pump power end generated severe heat and abnormal noise, forcing shutdown. The high-precision bearing burned out due to poor lubrication and long-term heavy-load operation. Maintenance staff replaced the damaged bearing, cleaned the bearing cage, replenished lubricating oil, and restored normal operation after clearance adjustment.
Case 2: Oil Leakage Due to Damaged Oil Seal
A large amount of lubricating oil leakage occurred at the bearing cover, leading to insufficient oil level and accelerated wear. The oil seal was aged and deformed, losing its sealing effect. Workers replaced the matched oil seal, installed new sealing gaskets, retightened fastening bolts, and completely eliminated the leakage.
Case 3: Abnormal Motion Due to Crosshead Wear
The crosshead assembly showed obvious vibration and unstable reciprocating motion, with excessive clearance. The crosshead surface and crosshead pin were severely worn. Technicians replaced the worn crosshead components, matched new pin retainer shims, adjusted the assembly clearance, and restored stable motion transmission.
Frequently Asked Questions (FAQ)
| Question | Answer |
| Are these parts fully compatible with LS-NOV 3NB-1300C mud pump pinion shaft & crosshead assembly? | Yes, all parts in this list are custom-designed for the LS-NOV 3NB-1300C mud pump pinion shaft & crosshead assembly (107.12.10.00), fully matching OEM dimensions, material standards and installation requirements with 100% direct interchangeability. |
| What is the standard operating temperature range for this assembly? | The normal continuous operating temperature of the pinion shaft and crosshead assembly is ≤75℃; temperatures exceeding this indicate insufficient lubrication or component wear. |
| How to adjust the clearance of the crosshead pin retainer? | Use the matched multi-thickness shims (δ0.25, δ0.5, δ1, δ2) to adjust clearance, ensuring the clearance is controlled within 0.08-0.12mm for optimal operation. |
Procurement Guidance
This LS-NOV 3NB-1300C mud pump pinion shaft & crosshead assembly parts list is a professional and 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 performance testing and wear resistance testing, fully complying with API 7K industry standards and original equipment quality requirements, with ultra-high strength, wear resistance and fatigue resistance.
