Product Introduction
This series of pinion shaft and crosshead replacement parts covers all core matching components suitable for Lanzhou LS 3NB500C, 3NB1000C, 3NB1300C, 3NB1600 mud pumps, including pinion shafts, left & right-hand gears, crosshead assemblies, crosshead pins, bushes, high-precision special bearings, bearing cages, bearing covers, oil boxes, oil seals, various gaskets, locking wires, screws, bolts, keys, pin retainers, adjusting shims and other matching fittings. All parts are made of high-strength alloy steel, wear-resistant cast iron and high-performance polymer sealing materials, processed with precision CNC machining and heat treatment processes to ensure perfect fit with original assembly interfaces, requiring no on-site modification or secondary processing.
Core Functional Specifications
Each component is engineered to withstand harsh heavy-load drilling site operating conditions, with clear authoritative performance indicators to ensure stable field operation:
- Power Transmission Performance: The complete assembly supports stable transmission of rated power up to 1600HP, with precise gear meshing and zero power loss, fully matching the power output requirements of all four LS 3NB series mud pump models.
- Wear Resistance Performance: Forged crosshead pins and bushes feature high surface smoothness and wear resistance, with a reciprocating wear life of over 3200 working hours, effectively reducing clearance deviation caused by friction wear.
- Bearing Load Capacity: Special heavy-duty bearings adopt rolling friction design, with a maximum radial load capacity of up to 1200kN, adapting to long-term heavy-load and high-impact reciprocating motion.
- Sealing Stability: Special oil seals adopt oil-resistant and wear-resistant polymer materials, achieving zero lubricating oil leakage under long-term operation, with a service life of up to 3000 working hours.
- Fastener Anti-Loosening Performance: High-strength screws and bolts matched with locking wires have stable torque retention, maintaining firm connection under long-term high-frequency vibration without loosening or fracture.
Applicable Operating Conditions
This series of pinion shaft and crosshead parts performs stably in various harsh drilling scenarios, with strong environmental adaptability:
- Onshore Oilfield Drilling: Land deep-well rigs, desert drilling platforms, mountain and frozen soil drilling sites, adapting to high load, large temperature differences, dust erosion and continuous long-term operation.
- Offshore Drilling Operations: Offshore platforms and jack-up drilling rigs, resisting salt spray corrosion, high humidity and wave-induced continuous vibration without performance degradation.
- Heavy-Load Continuous Operation: Adapting to 24-hour uninterrupted drilling construction, maintaining stable transmission performance under long-term heavy-load and high-impact reciprocating motion.
- Various Lubrication Conditions: Suitable for conventional and high-performance 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 and 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 pump operation; check lubricating oil level and quality.
- Weekly Maintenance: Tighten high-strength screws and bolts to rated torque; check the firmness of locking wires and pin retainers; clean surface dust and oil stains.
- 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.
- We supply the following spare parts:
| NAME | PART NO | |||
| 3NB500C | 3NB1000C | 3NB1300C | 3NB1600 | |
| Slush pump | 107.15.00 | 107.14.00 | 107.12.00 | 107.11.00 |
| Pinion shaft & crosshead | 107.15.10.00 | 107.14.10.00 | 107.12.10.00 | 107.11.10.00 |
| crosshead assy | 107.06.20.30-1 | 107.12.20.22 | ||
| crosshead center & L H | 107.14.20.19 | 107.11.20.33 | ||
| Screw | 107.06.20.38（M20×60） | 107.06.20.38（M20×60） | 107.06.20.38（M20×60） | 107.11.20.43（M20×55） |
| Wire | φ1.6 L=4000 | φ1.6 L=15000 | φ1.6 L=1800 | φ2 L=2500 |
| Pin retainei | 107.06.20.51 | 107.04.20.17-2 | 107.05.20.17-1 | 107.11.20.44 |
| Bearing | 3549350（φ175×φ245×160） | CG154734HU（φ170×φ260×192） | CG154836HU（φ180×φ280×219） | 1549420（φ209×φ282× 236） |
| Oil cinductor | 107.15.20.20（φ20×2 L=30） | 107.14.20.20（φ20×2 L=30） | 107.12.20.26（φ20×2 L=25） | 107.11.20.38（φ20×2 L=25） |
| Bush | 107.06.10.10 | 107.14.10.01 | 107.12.10.01 | 107.11.10.02 |
| Bearing cover | 107.15.10.02 | 107.14.10.02 | 107.12.10.02 | 107.11.10.01 |
| Oil seal | D7-1-67（190×230×15） | D7-1-67（220×260×18） | D7-1-67（240×280×18） | D7-1-67（260×300×20） |
| Bearing | CG32836HU1（φ180×φ280×82.6） | CG32840HU（φ220×φ320×88.9） | 32844HU1（φ220×φ350×98.4） | 32848HU（φ240×φ390×108） |
| Bearing cage | 107.15.10.04 | 107.14.10.04 | 107.12.10.07 | 107.11.10.03 |
| Gasket | 107.15.10.10（δ1） | 107.14.10.05（δ1） | 107.12.10.08（δ1） | 107.11.10.04（δ1） |
| Screw | GB32.1-88（M12×25） | GB32.1-88（M12×25） | GB32.1-88（M16×30） | GB32.1-88（M16×30） |
| Wire | φ1.2 L=600 | φ1.2 L=600 | φ1.2 L=600 | φ12 L=1500 |
| Oil box | 107.15.11.00 | 107.14.11.00 | 107.12.11.00 | 107.11.12.00 |
| Shaft | 107.15.10.06 | 107.14.10.06 | 107.12.10.09 | 107.11.10.05 |
| Right-hand gear | 107.15.10.07 | 107.14.10.07 | 107.12.10.10 | 107.11.10.07 |
| key | 107.15.10.08 | 107.14.10.08（45×240） | gb1096-79（45×250） | 107.11.10.06 |
| Left-hand gear | 107.15.10.09 | 107.14.10.09 | 107.10.10.11 | 107.11.10.08 |
| Gasket | 107.15.10.05（δ2） | 107.14.10.03（δ2） | 107.12.10.06（δ2） | 107.11.10.09（δ2） |
| Gasket | 107.15.10.03（δ0.1） | 107.14.10.10（δ0.1） | 107.12.10.03（δ1） | 107.11.10.10（δ1） |
| Gasket | 107.12.10.04（δ0.5） | 107.11.10.11（δ0.5） | ||
| Gasket | 107.12.10.05（δ0.4） | 107.11.10.12（δ0.4） | ||
| Seal | D4-4-66(290×5.7) | D4-4-66(330×5.7) | ||
| Bolt | GB5783-86(M16×55) | GB5783-86(M20×50) | GB5783-86(M20×50) | GB5783-86(M20×50) |
| Master | GB93-87(16) | GB93-87垫圈(20) | GB93-87(20) | GB93-87(20) |
| key | 107.15.10.01(44.45×38.1×290) | 107.04.10.10(44.45×360) | 107.05.10.09(44.45×381) | 107.11.10.13(50.8×38.1×385) |
| shim for pin retainer | 107.15.20.21（δ2） | 107.14.20.21（δ2） | 107.12.20.27（δ2） | 107.11.20.39（δ2） |
| shin for pin retainer | 107.15.20.22（δ1） | 107.14.20.22（δ1） | 107.12.20.28（δ1） | 107.11.20.40（δ1） |
| shin for pin retainer | 107.15.20.23（δ0.5） | 107.14.20.23（δ0.5） | 107.12.20.29（δ0.5） | 107.11.20.41（δ0.5） |
| shim for pin retainer | 107.15.20.24（δ0.25） | 107.14.20.24（δ0.25） | 107.12.20.30（δ0.25） | 107.11.20.42（δ0.25） |
| Crosshead pin | 107.06.20.34 | 107.14.20.11 | 107.05.20.16 | 107.11.20.37 |
| Crosshead right | 107.15.20.31-1 | |||
| Crosshead center(right) | 107.12.20.23 | 107.11.20.34 | ||
| outer retainer | 107.06.20.32 | 107.04.20.24(170) | 107.05.20.18 | 107.11.20.36 |
| Inside retainer 107.06.20.28 | 107.06.20.28 | 107.04.20.18(260) | 107.12.20.24 | 107.11.20.35 |
On-Site Fault Repair Case Studies
Case 1: Bearing Burnout Causing Abnormal Vibration
A land oilfield drilling rig’s Lanzhou LS 3NB1300C mud pump had severe abnormal vibration and high temperature at the pinion shaft bearing position. On-site inspection revealed that the special bearing (32844HU1) 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 problems were completely resolved.
Case 2: Oil Seal Failure Leading to Lubricating Oil Leakage
An offshore drilling site’s LS 3NB1600 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) 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 Clearance Deviation
A drilling team’s LS 3NB1000C mud pump showed abnormal noise and unstable reciprocating motion during operation. Inspection found that the crosshead bush (107.14.10.01) 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 pinion shaft & crosshead parts fully compatible with all four Lanzhou LS 3NB mud pump models? | Yes, all parts in this catalog are precisely designed to match 3NB500C, 3NB1000C, 3NB1300C, 3NB1600 mud pump pinion shaft and crosshead assemblies, with OEM-standard dimensions and perfect interface fitting, no on-site modification required for installation. |
| What is the recommended replacement cycle for bearings under normal operation? | Under standard drilling conditions, adequate lubrication and rated load operation, the special heavy-duty bearings have a recommended replacement cycle of 3000-3500 working hours; in heavy-load or continuous operation environments, the inspection and replacement cycle should be shortened appropriately. |
| How to adjust the crosshead assembly clearance correctly? | The assembly clearance can be precisely adjusted by using the matching multi-specification pin retainer shims (δ0.25/δ0.5/δ1/δ2), and the clearance should be controlled within the API 7K standard range of 0.15-0.25mm to ensure stable operation. |
Procurement Guidance
This Lanzhou LS 3NB series mud pump pinion shaft and crosshead assembly parts list is a professional and reliable reference for oilfield drilling equipment management, maintenance and 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 transmission assembly failures, reduce equipment downtime and maintenance costs.
