1. Introduction & Core Purpose
All spare parts listed below are 100% compatible with the NATIONAL 7-P-50 equipment, covering key components critical to its stable operation. We target industrial maintenance teams, equipment operators, and procurement departments that rely on NATIONAL 7-P-50 for heavy-duty operations—solving pain points like hard-to-source genuine parts, frequent component wear, and unplanned downtime. The core purpose is to supply high-quality, model-specific spare parts that extend equipment service life, reduce maintenance costs, and ensure uninterrupted operation, complying with API 610 (American Petroleum Institute Standard for Centrifugal Pumps) and ISO 9001 quality management standards.
2. Classified Spare Parts with Detailed Specifications
2.1 Crosshead Assembly Parts
These parts form the crosshead assembly, a key component that converts rotational motion to linear motion in NATIONAL 7-P-50. Frequent friction and heavy loads cause easy wear, leading to equipment jamming. Our genuine parts ensure precise fit, reduce friction, and are ideal for high-load industrial scenarios like oil and gas pumping or chemical processing.
No. | Part Name | Part Number | Material | Main Wear Reasons | Usage Precautions to Avoid Damage |
1 | Pin of Crosshead | 1294028 | High-strength alloy steel (40Cr), quenched and tempered for hardness (HRC 55-60) | 1. Frequent rotational friction with crosshead; 2. Lack of proper lubrication; 3. Misalignment causing uneven stress. | 1. Apply high-temperature lubricating grease (complying with NLGI Grade 2) every 200 working hours; 2. Regularly check alignment to avoid eccentric wear; 3. Inspect for surface scratches monthly and polish promptly. |
2 | Crosshead | 1294015 | Ductile iron (QT600-3) with wear-resistant surface coating | 1. Sliding friction with crosshead bearing; 2. Contaminant entry causing abrasive wear; 3. Overload leading to structural deformation. | 1. Keep the assembly clean to prevent dust/metal particles from entering; 2. Avoid equipment overload (operate within rated load range); 3. Replace crosshead bearing timely to reduce friction damage. |
3 | Bearing, Crosshead | ZB-5620 | Chrome steel (GCr15) with sealed lubrication design | 1. Lubricant degradation or leakage; 2. Contaminant intrusion damaging bearing rollers; 3. High operating temperature accelerating wear. | 1. Replace lubricant every 500 working hours with API-certified lubricants; 2. Check seal integrity monthly to prevent contamination; 3. Monitor operating temperature (not exceed 80℃) to avoid lubricant failure. |
2.2 Connecting & Extension Components
These components transmit motion and force between key parts of NATIONAL 7-P-50, facing frequent tensile and compressive stress. Poor quality or worn parts cause motion loss and equipment inefficiency. Our parts ensure strong load-bearing capacity, precise connection, and are suitable for continuous industrial operation scenarios.
No. | Part Name | Part Number | Material | Main Wear Reasons | Usage Precautions to Avoid Damage |
1 | Extension Rod | 1294083 | High-carbon steel (45#) with corrosion-resistant zinc plating | 1. Tensile and compressive stress fatigue during operation; 2. Corrosion from harsh industrial environments; 3. Improper installation causing uneven stress. | 1. Inspect for surface corrosion quarterly and touch up with anti-corrosion paint; 2. Ensure proper installation torque (comply with NATIONAL 7-P-50 maintenance manual); 3. Avoid sudden load changes to reduce stress impact. |
2 | Connecting Rod | 1294007 | Alloy steel (40CrNiMoA) with heat treatment for fatigue resistance | 1. Cyclic stress leading to fatigue cracks; 2. Friction at connection points; 3. Overload causing bending deformation. | 1. Inspect for cracks with magnetic particle testing every 1000 working hours; 2. Lubricate connection points every 300 working hours; 3. Operate equipment within rated load to prevent bending. |
2.3 Gear & Shaft Components
These are core power transmission parts of NATIONAL 7-P-50, responsible for transferring rotational motion. Gear wear or shaft damage leads to power loss and equipment shutdown. Our parts feature precise tooth profiling, high hardness, and are designed for heavy-duty power transmission in industrial settings.
No. | Part Name | Part Number | Material | Main Wear Reasons | Usage Precautions to Avoid Damage |
1 | Pinion Shaft | 1294010 | Alloy steel (20CrMnTi) with carburizing and quenching treatment (HRC 60-65) | 1. Gear meshing friction causing tooth wear; 2. Bearing failure leading to shaft misalignment; 3. Contaminant entry damaging shaft surface. | 1. Check gear meshing clearance monthly (maintain 0.15-0.25mm); 2. Replace pinion shaft bearing timely to avoid misalignment; 3. Keep the gear box clean to prevent contaminant intrusion. |
2 | Bull Gear | 1294008 | Alloy steel (45CrNiMoV) with tooth surface quenching treatment | 1. Continuous meshing with pinion shaft causing tooth wear; 2. Improper lubrication leading to dry friction; 3. Overload causing tooth breakage. | 1. Use industrial gear oil (ISO VG 150) and replace every 1500 working hours; 2. Avoid equipment overload to prevent tooth stress; 3. Inspect tooth surface for wear monthly and replace if tooth thickness reduces by 10%. |
3 | Bearing, Pinion Shaft | ZB-6292 | Chrome steel (GCr15SiMn) with high-speed bearing design | 1. High rotational speed causing lubricant degradation; 2. Shaft misalignment leading to uneven load; 3. Contaminant intrusion damaging bearing races. | 1. Use high-temperature, anti-wear lubricant suitable for high-speed operation; 2. Check shaft alignment every 500 working hours; 3. Replace bearing seals annually to prevent contamination. |
2.4 Bearing & Bearing Accessories
These parts support rotational components of NATIONAL 7-P-50, ensuring smooth motion. Bearing failure is a common cause of equipment downtime. Our parts comply with ABMA (American Bearing Manufacturers Association) standards, featuring strong load-bearing capacity and long service life for industrial operating conditions.
No. | Part Name | Part Number | Material | Main Wear Reasons | Usage Precautions to Avoid Damage |
1 | Cage, Main Bearing | 1294011 | High-strength brass (H62) with precision stamping | 1. Friction between bearing rollers and cage; 2. Lubricant shortage causing dry friction; 3. Impact load damaging cage structure. | 1. Ensure sufficient lubrication to reduce roller-cage friction; 2. Avoid sudden startup/shutdown to reduce impact load; 3. Inspect cage for deformation during bearing replacement. |
2 | Cap, Bearing Right | 1294012 | Gray cast iron (HT200) with anti-rust coating | 1. Vibration during operation causing loose fasteners; 2. Corrosion from environmental moisture; 3. Improper installation leading to uneven pressure. | 1. Tighten fasteners every 300 working hours (comply with specified torque); 2. Keep the bearing housing dry to prevent corrosion; 3. Ensure even pressure during installation to avoid cap deformation. |
3 | Bearing, Eccentric | ZB-22000 | Chrome steel (GCr15) with eccentric design for load-bearing | 1. Eccentric load causing uneven wear; 2. Lubricant leakage or degradation; 3. High operating temperature reducing bearing life. | 1. Check lubricant level weekly and top up if necessary; 2. Monitor operating temperature (not exceed 85℃); 3. Inspect eccentric alignment every 600 working hours to avoid uneven load. |
4 | Bearing, Main | ZT-10003 | Chrome steel (GCr15) with double-row roller design | 1. Heavy radial load causing roller wear; 2. Contaminant intrusion damaging bearing surfaces; 3. Lubricant aging leading to increased friction. | 1. Replace main bearing every 2000 working hours (or as per wear condition); 2. Use clean, high-quality lubricant (comply with ABMA standards); 3. Check bearing seals monthly to prevent contamination. |
3. On-Site Fault Maintenance Case
Case: NATIONAL 7-P-50 Equipment Jamming Due to Crosshead Bearing Failure
Fault Phenomenon: A petrochemical plant’s NATIONAL 7-P-50 pump jammed suddenly during operation, with abnormal noise from the crosshead area and increased motor current. Inspection showed the crosshead bearing (ZB-5620) was severely worn, with rollers stuck and lubricant leaked.
Fault Cause: The bearing seal was damaged, allowing dust and metal particles to enter, which damaged the rollers and caused lubricant degradation. The maintenance team failed to check seal integrity regularly, leading to prolonged contamination.
Maintenance Method: Stop the equipment and disconnect the power; replace the worn ZB-5620 crosshead bearing with our genuine part; clean the crosshead assembly to remove contaminants; replace the bearing seal and refill with API-certified lubricant; restart the equipment—jamming and noise disappeared, and operation returned to normal.
Preventive Measures: Follow the usage precautions for ZB-5620 bearing, check seal integrity monthly, and replace lubricant every 500 working hours to avoid similar failures.
4. FAQ (Frequently Asked Questions)
The following FAQs address common doubts of users (maintenance teams, procurement departments) regarding NATIONAL 7-P-50 spare parts, providing practical, professional answers aligned with user intentions:
FAQ | Answers |
How to confirm that your spare parts are fully compatible with NATIONAL 7-P-50, especially for parts like ZB-5620 and 1294015? | All our parts are manufactured to match NATIONAL 7-P-50’s original specifications. You can provide the part number (e.g., ZB-5620, 1294015) or equipment model, and we will verify compatibility within 24 hours. We also supply technical drawings for comparison, ensuring 100% fit without modifications. |
What is the recommended replacement cycle for key parts like Bull Gear (1294008) and Main Bearing (ZT-10003) to avoid unplanned downtime? | For Bull Gear (1294008), replace every 3000-4000 working hours (or if tooth wear exceeds 10%). For Main Bearing (ZT-10003), replace every 2000 working hours. We recommend combining replacement with regular maintenance, as specified in our usage precautions, to reduce downtime. |
Why should I choose your genuine parts instead of aftermarket alternatives for NATIONAL 7-P-50? | Our parts use high-grade materials (e.g., alloy steel for shafts, chrome steel for bearings) and comply with API 610 and ABMA standards, ensuring longer service life (30% longer than aftermarket parts). Aftermarket parts often have poor fit and durability, leading to frequent failures and higher long-term maintenance costs. |
5. Procurement Reference Standards & Call to Action
5.1 Procurement Reference Standards
To ensure you purchase high-quality, compatible spare parts for NATIONAL 7-P-50 and comply with Google E-E-A-T standards, follow these guidelines:
• Compatibility Standard: Always confirm the part number and equipment model (NATIONAL 7-P-50) before procurement. Our parts are model-specific, so providing the exact part number (e.g., 1294007, ZB-6292) ensures you get the right part the first time.
• Quality Standard: Choose parts that comply with API 610, ISO 9001, and ABMA standards. We provide quality certificates for all parts, ensuring genuine quality, durability, and compliance with industrial regulations.
• Technical Support Standard: Select suppliers with professional expertise in NATIONAL 7-P-50 parts. Our team offers maintenance guidance, fault diagnosis, and procurement advice, helping you solve technical problems quickly.
5.2 Call to Action
If you are looking for a reliable supplier of genuine NATIONAL 7-P-50 spare parts—covering all listed components (Pin of Crosshead 1294028, Bull Gear 1294008, Bearings ZB-5620/ZT-10003, and more)—we are your ideal choice. We supply all the parts you need, ensuring 100% compatibility, high quality, and compliance with industrial standards.
We are committed to providing competitive prices, professional technical support, and stable supply, helping you extend NATIONAL 7-P-50’s service life, reduce maintenance costs, and ensure uninterrupted industrial operation. Whether you need routine maintenance parts, emergency replacements, or technical consultation, we can provide tailored solutions.
Contact us now with your required part numbers, procurement quantity, or maintenance needs. Our professional team will reply promptly with detailed quotes and technical guidance, helping you get the right parts quickly and efficiently to keep your NATIONAL 7-P-50 running at peak performance.
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Should you have any purchase intentions, please contact us – we will offer you our most favorable price.