Product Introduction
This series of replacement parts covers all core matching components of the LSNOI 3NB-1600 mud pump pinion shaft & crosshead assembly, including left-hand & right-middle crossheads, high-strength bolts, locking wires, pin retainers, heavy-duty special bearings, oil conductors, wear-resistant bushes, bearing covers, oil seals, bearing cages, various specifications of gaskets and shims, oil boxes, transmission shafts, left & right-hand gears, flat keys, crosshead pins, inner & outer retainers and other complete fittings. Every part is made of high-strength wear-resistant materials, processed by precision CNC machining to ensure perfect fit with original assembly interfaces, requiring no on-site modification, grinding or secondary processing. The parts are designed for quick disassembly and assembly, suitable for daily routine maintenance, emergency fault repair and full power end overhaul.
Core Functional Specifications
Each component is engineered to withstand harsh heavy-load drilling site conditions, with clear authoritative performance indicators to ensure stable and safe field operation:
- Power Transmission Performance: The complete assembly supports stable transmission of 1600HP rated power, with precise gear meshing and zero effective power loss, fully matching the heavy-load operation requirements of the LSNOI 3NB-1600 mud pump.
- Load-Bearing & Wear Resistance: Forged crosshead, pin and bush components have ultra-high surface finish and wear resistance, with reciprocating friction life exceeding 3500 working hours, effectively controlling assembly clearance within standard ranges.
- High-Pressure Sealing Performance: Special oil seals adopt oil-resistant and aging-resistant polymer materials, achieving zero lubricating oil leakage under long-term operation, with a sealing service life of up to 3200 working hours.
- Anti-Loosening & Stability: 12.9-grade high-strength bolts matched with spring washers and locking wires maintain stable locking torque under long-term high-frequency vibration, avoiding fastener loosening or fracture.
Applicable Operating Conditions
This series of pinion shaft & crosshead parts performs stably in various harsh 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 heavy load, large temperature differences, dust erosion and 24-hour continuous operation.
- 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 reciprocating operation, maintaining stable transmission performance under high impact and heavy friction conditions.
- Conventional Lubrication Systems: Suitable for standard mud pump lubricating oil environments, with sealing components resistant to oil corrosion and long service life.
Maintenance & Service Recommendations
To ensure the safe and stable operation of the pinion shaft & crosshead assembly and prolong its service life, follow these API-standardized maintenance protocols:
- Daily Inspection: Check for lubricating oil leakage at bearing covers and oil boxes; monitor abnormal noise, vibration and shaft deflection during operation; check lubricating oil level and temperature.
- Weekly Maintenance: Tighten high-strength bolts to rated torque; check the firmness of locking wires and pin retainers; clean surface oil stains and dust.
- Monthly Maintenance: Inspect oil seals, gaskets and bearings for wear, aging or damage; check gear meshing clearance and crosshead assembly fit clearance.
- Quarterly Maintenance: Replace deteriorated lubricating oil; overhaul the internal transmission structure; adjust assembly clearance with matching shims; replace severely worn wearing parts.
- Storage Requirements: Store spare parts in a dry, ventilated and dust-free environment; apply anti-rust oil on metal surfaces; rubber sealing parts should be protected from direct sunlight and high temperature to prevent premature aging.
We supply the following spare parts:
| 107.11.10.00 Pinion Shaft & Crosshead Assembly | ||
| Item No. | Part No. | Description |
| 401 | 107.11.20.33 | Left-hand crosshead |
| 402 | 107.11.20.43 | Bolt M20x55 |
| 403 | Wire φ2 L=2500 | |
| 404 | 107.11.20.44 | Pin retainer |
| 405 | 154942Q | Bearing φ209xφ283×236 |
| 406 | 107.11.20.38 | Oil conductor φ20×2 L=25 |
| 407 | 107.11.10.02 | Bush |
| 408 | 107.11.10.01 | Bearing cover |
| 409 | D7-1-67 | Oil seal 260x300x20 |
| 410 | 32848HU | Bearing φ240xφ390×108 |
| 411 | 107.11.10.03 | Bearing cage |
| 412 | 107.11.10.04 | Gasket δ1 |
| 413 | GB32.1-88 | Bolt M16x30 |
| 414 | Wire φ12, L=1500 | |
| 415 | 107.11.11.00 | Oil box |
| 416 | 107.11.10.05 | Shaft |
| 417 | 107.11.10.07 | Right-hand gear |
| 418 | 107.11.10.06 | Key |
| 419 | 107.11.10.08 | Left-hand gear |
| 420 | 107.11.10.09 | Gasket δ2 |
| 421 | 107.11.10.10 | Gasket δ1 |
| 422 | 107.11.10.11 | Gasket δ0.5 |
| 423 | 107.11.10.12 | Gasket δ0.4 |
| 424 | GB5783-86 | Bolt M20x50 |
| 425 | GB93-87 | Washer 20 |
| 426 | 107.11.10.13 | Key 50.8×38.1×385 |
| 427 | 107.11.20.39 | Shim for pin retainer |
| 428 | 107.11.20.40 | Shim for pin retainer |
| 429 | 107.11.20.41 | Shim for pin retainer |
| 430 | 107.11.20.42 | Shim for pin retainer |
| 431 | 107.11.20.37 | Crosshead pin |
| 432 | 107.11.20.35 | Outer retainer |
| 433 | 107.11.20.36 | Inside retainer |
| 434 | 107.11.20.34 | Right, middle-hand crosshead |
On-Site Fault Repair Case Studies
Case 1: Bearing Burnout Causing Abnormal Vibration
A land deep-well rig’s LSNOI 3NB-1600 mud pump had severe abnormal vibration and local high temperature at the power end. On-site inspection revealed that the heavy-duty bearing (32848HU) was burned out due to long-term heavy-load operation and insufficient lubrication. Maintenance personnel replaced the damaged bearing and matching bearing cage, replenished qualified lubricating oil, and the abnormal vibration and temperature rise faults were completely resolved.
Case 2: Oil Seal Failure Leading to Lubricating Oil Leakage
An offshore drilling site’s 3NB-1600 mud pump had serious lubricating oil leakage at the bearing cover. Long-term oil corrosion and equipment vibration caused the oil seal (D7-1-67, 260x300x20) to age and deform, losing sealing performance. Technicians removed the damaged oil seal, cleaned the mounting surface, installed a new oil seal and matching gasket, and completely eliminated the oil leakage fault.
Case 3: Worn Crosshead Bush Causing Excessive Clearance
A drilling team’s 3NB-1600 mud pump showed abnormal noise and unstable reciprocating motion during operation. Inspection found that the crosshead bush (107.11.10.02) was severely worn, leading to excessive assembly clearance and eccentric motion. Workers replaced the worn bush, adjusted the assembly clearance with professional shims, and restored normal operation of the crosshead assembly.
Frequently Asked Questions (FAQ)
| Question | Answer |
| Are these 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 pinion shaft & crosshead assembly (107.11.10.00), with OEM-standard dimensions and perfect interface fitting, no on-site modification required for installation. |
| What is the recommended replacement cycle for key bearings and oil seals? | Under standard heavy-load drilling conditions, bearings and oil seals are recommended to be replaced every 3000-3800 working hours; in harsh continuous operation environments, the replacement cycle should be shortened to 2500-3000 working hours to avoid sudden failures. |
| How to adjust the crosshead assembly clearance correctly? | The assembly clearance can be precisely adjusted using matching multi-specification pin retainer shims (δ0.4/δ0.5/δ1/δ2), and the standard clearance should be controlled within 0.15-0.25mm to ensure stable reciprocating motion. |
Procurement Guidance
This LSNOI 3NB-1600 mud pump pinion shaft & crosshead assembly parts list is a professional and reliable reference for oilfield drilling equipment management, power end maintenance and spare parts procurement teams, providing standardized, high-strength and high-wear-resistance spare parts solutions for daily routine maintenance, emergency fault repair and spare parts inventory preparation. Using these OEM-standard replacement parts can effectively avoid the risks of poor fitting, substandard strength and short service life caused by non-standard parts, quickly resolve common power end transmission faults, and ensure the stable operation of mud pump equipment.
