Product Introduction
This series of fluid end replacement parts covers all core matching components suitable for Lanzhou LS 3NB500C, 3NB1000C, 3NB1300C, 3NB1600 mud pumps, including fluid end frame assemblies, upper and lower crosshead guides, intermediate rods, packing boxes, water retainers, spray pump systems, window covers, cover plates, single-lip oil seals, various sealing gaskets, retaining rings, high-strength bolts, nuts, washers, spring washers, positioning pins, locking wires and other matching fittings. All parts are made of high-strength alloy steel, wear-resistant and oil-resistant polymer materials, processed by precision CNC equipment to ensure complete consistency with original assembly interfaces, requiring no on-site modification or secondary processing. The parts are designed for universal matching across four pump models, simplifying spare parts inventory management and procurement work, and meeting the needs of daily routine maintenance, emergency fault repair and full fluid end overhaul.
Core Functional Specifications
Each component is engineered to withstand harsh drilling site high-pressure and high-wear operating conditions, with clear and reliable authoritative performance indicators:
- High-Pressure Bearing Performance: The overall fluid end assembly supports a rated working pressure of 0-35MPa, fully adapting to the high-pressure mud delivery requirements of all four models of LS mud pumps, resisting continuous hydraulic impact and pressure fluctuation damage.
- Sealing Stability: Multi-specification sealing gaskets and single-lip oil seals adopt special mud-resistant and oil-resistant materials, achieving zero leakage under long-term high-pressure mud contact, with a service life of up to 3200 working hours.
- Wear Resistance: Intermediate rods and crosshead guides are made of high-hardness alloy steel with surface strengthening treatment, featuring excellent mud erosion resistance, and the wear rate is reduced by more than 40% compared with ordinary parts.
- Fastener Anti-Loosening Performance: High-strength bolts matched with spring washers and locking wires have stable torque retention, maintaining firm connection under long-term high-frequency vibration without loosening or fracture.
Structural Design Features
These fluid end parts prioritize high-pressure safety, wear resistance and convenient on-site maintenance, fully adapting to harsh drilling site operating environments:
- Reinforced Frame Structure: The fluid end frame assembly adopts integrated welding and forging process, with high rigidity and pressure resistance, not easy to deform under high-pressure impact, ensuring stable operation of the whole assembly.
- Precision Positioning Design: Crosshead guides and positioning pins adopt precision matching design, ensuring accurate alignment of moving components, reducing eccentric wear and prolonging service life.
- Combined Sealing Structure: Multi-layer gaskets and oil seals are used for key sealing parts, double guaranteeing sealing effect, effectively preventing mud leakage and lubricating oil loss.
- Quick Replacement Structure: Quick disassembly design is adopted for wearing parts such as packing boxes, sealing rings and cover plates, reducing on-site maintenance and replacement workload.
- Anti-Vibration Design: All fasteners are equipped with anti-loosening washers or locking wires, effectively avoiding fastener failure caused by long-term pump vibration.
Maintenance & Service Recommendations
To ensure the safe and stable operation of the fluid end assembly and prolong its service life, follow these standardized maintenance protocols in line with API industry standards:
- Daily Inspection: Check all flange and joint connections for mud leakage; monitor abnormal noise and vibration during pump operation; check the sealing condition of oil seals and packing boxes.
- Weekly Maintenance: Tighten high-strength bolts and nuts to rated torque; clean mud deposits on the surface of the fluid end; check whether locking wires are intact and damaged.
- Monthly Maintenance: Inspect sealing gaskets, oil seals and retaining rings for aging, wear and damage, and replace damaged parts promptly; check the wear degree of intermediate rods and crosshead guides.
- Quarterly Maintenance: Overhaul the internal structure of the fluid end, clean the spray pump system; check the firmness of all fasteners; replace severely worn wearing parts.
- Storage Requirements: Store spare parts in a dry, ventilated and dust-free environment; rubber sealing parts should be protected from direct sunlight and high temperature to prevent premature aging.
- We supply the following spare parts:
| NAME | PART NO | |||
| NAME | 3NB500C | 3NB1000C | 3NB1300C | 3NB1600 |
| Slush pump | 107.15.00 | 107.14.00 | 107.12.00 | 107.11.00 |
| Description | 107.15.01.00 | 107.14.01.00 | 107.12.01.00 | |
| Bolt | GB5783-86(M12×20) | GB5783-86(M20×55) | GB5783-86(M20×55) | GB5783-86(M20×55) |
| Washer | GB93-87(16) | GB93-87(20) | GB93-87(20) | GB93-87(20) |
| Gasket | 107.06.90.15（δ5） | 107.14.01.00 | 107.11.90.33 | 107.11.90.33 |
| Windows cover | 107.06.90.16（δ6） | 107.01.90.02（δ3） | 107.01.90.03（δ3） | 107.01.90.03（δ3） |
| Bolt | GB5783-86(M16×45) | GB5783-86(M20×55) | GB5783-86(M20×55) | GB5783-86(M20×55) |
| Washer | GB93-87(16) | GB93-87(20) | GB93-87(20) | GB93-87(20) |
| Bolt | GB5783-86(M16×35) | GB5783-86(M16×30) | GB5783-86(M16×30) | GB5783-86(M16×30) |
| Washer | GB93-87(16) | GB93-87(16) | GB93-87(16) | GB93-87(16) |
| Gasket | 107.15.96.02（δ5） | 107.11.96.02（δ5） | 107.11.96.02（δ5） | 107.11.96.02（δ5） |
| Packing box | 107.15.96.03 | 107.11.96.03 | 107.11.96.03 | 107.14.96.03 |
| Gasket | 107.15.96.01（δ5） | 107.14.96.01（δ5） | 107.12.96.01（δ5） | 107.11.96.01（δ5） |
| Intermediate rod | 107.15.01.01 | 107.11.01.02 | ||
| Water retainer | 107.06.39.00 | 107.11.70.00 | ||
| Frame assy | 107.15.90.00 | 107.14.90.00 | ||
| Spary pump system | 107.15.101.00 | 107.14.101.00 | ||
| crosshead guide lower | 107.15.90.07 | 107.14.90.06 | ||
| Bolt | 107.15.90.08 | 107.14.90.07 | ||
| Gasket | GB95-85(24) | GB97.1-85(24) | GB97.1-85(24) | GB97.1-85(24) |
| Wire | φ3 L=5280 | φ3 L=5280 | φ3 L=5400 | φ3 L=5400 |
| Gasket | 107.11.90.26（φ40×φ26） | 107.11.90.26（φ40×φ26） | 107.11.90.26（φ40×φ26） | 107.11.90.26（φ40×φ26） |
| Bolt | 107.06.60(M24×65) | 107.11.01.01M30 | 107.11.01.01M30 | 107.11.01.01M30 |
| Wire | φ3 L=2400 | φ3 L=2400 | φ3 L=2400 | φ3 L=2400 |
| Bolt | GB5782-86(M24×100) | GB5782-86(M24×100) | GB5782-86(M24×90) | GB5782-86(M24×90) |
| Nut | GB6170-86(M24) | GB6170-86(M24) | GB6170-86(M24) | GB6170-86(M24) |
| NAME | PART NO | |||
| NAME | 3NB500C | 3NB1000C | 3NB1300C | 3NB1600 |
| Slush pump | 107.15.00 | 107.14.00 | 107.12.00 | 107.11.00 |
| Description | 107.15.01.00 | 107.14.01.00 | 107.12.01.00 | 107.11.01.00 |
| Spring washer | GB93-87（24） | GB93-87（24） | GB93-87（24） | GB93-87（24） |
| Plate | 107.15.96.05 | 107.14.96.02 | 107.12.96.06 | 107.11.96.06 |
| Pin | GB119-86（A10×50） | GB119-86（A10×50） | GB119-86（A10×50） | GB119-86（A10×50） |
| Single lipoil seal | 107.15.97.00 | 107.11.97.00 | 107.11.97.00 | 107.11.97.00 |
| Ring | 107.15.96.04 | 107.11.96.04 | 107.11.96.04 | 107.11.96.04 |
| Ring | 107.15.96.05 | 107.11.96.05 | 107.11.96.05 | 107.11.96.05 |
| Plate | 107.15.96.07 | 107.11.96.07 | 107.11.96.07 | 107.11.96.07 |
| Bolt | GB5783-86（M10×25） | GB5783-86（M10×25） | GB5783-86（M10×25） | GB5783-86（M10×25） |
| Washer | GB93-87（10） | GB93-87（10） | GB93-87（10） | GB93-87（10） |
| Crosshead guide upper | 107.15.90.05 | 107.14.90.16 | 107.11.90.05 | 107.11.90.05 |
| Cover plate | 107.11.90.10 | 107.11.90.10 | 107.11.90.08-1 | 107.11.90.08-1 |
| Gasket | 107.11.90.11（δ8） | 107.11.90.11（δ8） | 107.11.90.09-1 | 107.11.90.09-1 |
| Bolt | GB5783-86（M10×35） | GB5783-86（M10×35） | GB5783-86（M16×40） | GB5783-86（M16×40） |
| Bolt | GB93-87（10） | GB93-87（10） | GB93-87（16） | GB93-87（16） |
On-Site Fault Repair Case Studies
Case 1: Worn Gasket Causing High-Pressure Mud Leakage
A land deep-well drilling rig’s Lanzhou LS 3NB1000C mud pump had serious high-pressure mud leakage at the fluid end joint. On-site inspection found that the sealing gasket (107.11.96.02, δ5) was severely worn and lost sealing performance due to long-term mud erosion and high-pressure impact. Maintenance personnel replaced the damaged gasket, re-tightened the matching high-strength bolts to standard torque, and completely eliminated the leakage fault, restoring normal mud pressure output.
Case 2: Single-Lip Oil Seal Failure Leading to Oil Leakage
An offshore drilling site’s LS 3NB1300C mud pump had lubricating oil leakage at the fluid end intermediate rod position, resulting in insufficient lubrication and mud contamination. The fault was caused by damage to the single-lip oil seal (107.11.97.00) due to long-term wear. Technicians removed the damaged oil seal, cleaned the mounting surface, installed a new oil seal, and the oil leakage problem was completely solved.
Case 3: Loose Bolts Causing Crosshead Guide Vibration
A drilling team’s LS 3NB1600 mud pump showed obvious abnormal vibration and noise during operation. The inspection found that the M24 high-strength bolts connecting the crosshead guide were loose due to long-term high-frequency vibration, leading to poor component fitting. Workers re-tightened all bolts, replaced damaged spring washers and locking wires, and eliminated vibration and noise, ensuring stable operation of the fluid end.
Frequently Asked Questions (FAQ)
| Question | Answer |
| Are these fluid end 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 fluid end assemblies, with OEM-standard dimensions and perfect interface fitting, no on-site modification required for installation. |
| What is the maximum pressure resistance of these fluid end components? | All fluid end core components are designed and manufactured with a rated pressure resistance of 35MPa, fully meeting the high-pressure mud delivery requirements of the four models of Lanzhou LS 3NB series mud pumps. |
| How often should the fluid end sealing gaskets be replaced? | Under normal drilling conditions, sealing gaskets are recommended to be replaced every 2800-3200 working hours; in high-abrasion, high-corrosion mud environments, the replacement cycle should be shortened to 2000-2500 working hours to prevent leakage failures. |
Procurement Guidance
This Lanzhou LS 3NB series mud pump fluid end assembly parts list is a professional and reliable reference for drilling equipment management, maintenance and procurement teams, providing standardized, high-strength and high-wear-resistance spare parts solutions for daily 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 fluid end failures, reduce equipment downtime and maintenance costs.
