QB21 Crankshaft Piston Pump & QYB40-60L Pneumatic Hydraulic Pump Replacement Parts

Introduction

In onshore and offshore oilfield operations, crankshaft piston pumps and pneumatic hydraulic pumps are the backbone of drilling, well control, and fluid transfer systems. The QB21 crankshaft piston pump is widely used for high-pressure fluid delivery in drilling mud circulation and well cementing, while the QYB40-60L pneumatic hydraulic pump (with a nominal pressure of 40MPa and nominal displacement of 60ML/stroke) serves as a critical auxiliary pump for blowout preventer (BOP) control—activating when electric pumps fail, during power outages, or in areas where electricity is prohibited. The 150QMD series components further support the stable operation of QYB40-60L pumps, ensuring seamless power conversion and pressure control. The parts listed, including 3GB series packing rings, V-type packing, cylinder liners, GB297-64 32215 tapered roller bearings, and 150QMD series cylinder pistons and single head rods, are engineered as direct drop-in replacements, fully compatible with QB21 crankshaft piston pumps, QYB40-60L pneumatic hydraulic pumps, and 150QMD series auxiliary systems—all essential for maintaining operational continuity in harsh oilfield environments.

Oilfield teams face persistent, costly pain points with these pumps: Packing wear and leakage leading to pressure loss and fluid waste, cylinder liner deformation causing pump jamming and reduced efficiency, bearing failure triggering abnormal vibration and equipment shutdowns, and valve seat damage disrupting fluid flow. These issues not only cause unplanned downtime (costing thousands per hour) but also risk safety incidents, especially in high-pressure well control scenarios. Our parts are designed to eliminate these pain points—prioritizing perfect compatibility, exceptional wear resistance, and long service life to keep your QB21, QYB40-60L, and 150QMD systems running reliably, minimize maintenance costs, and ensure compliance with strict oilfield safety standards.

We tailor our parts to the distinct needs of oilfield professionals: Maintenance engineers need parts that install quickly on-site without modifications, resist premature wear in high-pressure, corrosive environments, and simplify repairs—critical for getting systems back online fast during urgent breakdowns. Procurement managers require parts that meet international safety and quality standards, have verifiable technical specifications, and come from a reliable supply source to avoid delays that disrupt operations. Oilfield operations teams depend on parts that prevent unexpected failures, maintain stable pressure (up to 40MPa for QYB40-60L), and stand up to extreme conditions—from freezing northern oilfields to scorching desert wells and offshore saltwater environments. The core purpose of these parts is to provide a comprehensive, one-stop replacement solution for QB21, QYB40-60L, and 150QMD systems, covering every essential component from seals and bearings to cylinders and valve parts. This ensures all equipment maintains optimal performance, complies with industry safety standards (including GB/T 31033-2025), and reduces operational risks.

Product Overview

Our product portfolio covers four key categories of replacement parts, all manufactured to meet the highest industry standards and tailored to the specific needs of oilfield operations: 1) 3GB Series Sealing & Pump Parts (for QB21 Crankshaft Piston Pump): 3GB-00-17C/17D Packing rings, 3GB-B4A-01 to 3GB-B4D-01 V-type packing, 3GB-B4A to 3GB-B4D graphite packing, 3GB-00-13A to 13D Packing sleeves, 3GB-00-15/15A Cylinder liners, 3GB-00-02 Pump head body, 3GB-00-06 Valve seat, 3GB-00-03 Suction valve bracket, and more; 2) 3GB Series Fasteners & Structural Parts: 3GB-00-19 Tie rod nut, 3GB-00-21 Nut, 3GB-00-26 Crosshead, 3GB-00-25 Pin shaft, 3GB-00-29 Connecting rod cover; 3) Bearing & Auxiliary Parts: GB297-64 32215 Tapered Roller Bearings (75×130×33.5mm), 3GB-00-39 Single round head ordinary flat key, 3GB-00-34 Bearing gland; 4) 150QMD Series Parts (for QYB40-60L Pneumatic Hydraulic Pump): 150QMD-00-09 Air baffle, 150QMD-00-18 Cylinder piston, 150QMD-00-23 Single head rod, 150QMD-00-22 Reversing spring, 150QMD-00-38 Seal ring, and more.

All parts comply with API 6A (21st Edition) for high-pressure wellhead and tree equipment, GB/T 31033-2025 (Technical requirements for well control technology of oil & gas drilling, implemented September 1, 2025), and ASME B16.34 for pressure-containing components—ensuring they meet the strictest safety and performance standards for oilfield operations. They also hold ISO 9001:2015 quality management system certification and ISO 14001:2015 environmental management certification. Our exclusive performance data sets us apart: The 3GB-B4A-01 V-type packing (HNBR material) has a service life of 4600 working hours—1100 hours longer than standard packing; the 3GB-00-15 Cylinder liner (forged alloy steel) can operate smoothly for 5100 hours without deformation, even under continuous 38MPa pressure; the GB297-64 32215 Tapered Roller Bearing (a heavy-duty bearing ideal for high axial and radial loads) withstands 42,000 vibration cycles without failure; the 150QMD-00-23 Single head rod (for QYB40-60L) maintains structural integrity for 4900 working hours, solving the common problem of rod bending in high-vibration environments. Each part undergoes 100% dimensional inspection (≤0.002mm tolerance) and pressure testing per API 6A PR2 standards, with a 100% qualification rate before shipment.

Function Description

3GB Series Parts (for QB21 Crankshaft Piston Pump)

The QB21 crankshaft piston pump relies on 3GB series parts for high-pressure fluid delivery, and each component plays a critical role in preventing failures. 3GB-00-17C/17D Packing rings and 3GB-B4A-01 to 3GB-B4D-01 V-type packing provide tight seals at plunger connections, preventing hydraulic fluid leakage even under 38MPa pressure—solving the common pain point of leakage in high-pressure circulation systems. 3GB-B4A to 3GB-B4D Graphite packing offers superior heat resistance, making it ideal for high-temperature fluid delivery (up to 140°C) in well cementing operations. 3GB-00-15/15A Cylinder liners form a smooth, wear-resistant surface for piston movement, reducing friction and preventing jamming that disrupts pump flow. 3GB-00-06 Valve seats control fluid flow direction, preventing reverse flow that can damage pump internals and reduce efficiency. 3GB-00-02 Pump head bodies withstand high pressure and corrosion, ensuring the pump’s core structure remains intact in harsh oilfield media like drilling mud and sour gas.

Bearing & Fastener Parts

GB297-64 32215 Tapered Roller Bearings (75×130×33.5mm) are designed to handle both radial and axial loads—critical for the QB21 pump’s crankshaft operation, where heavy loads and vibration are common. These bearings prevent shaft misalignment and reduce friction, ensuring smooth pump operation and extending service life. 3GB-00-19 Tie rod nuts and 3GB-00-21 Nuts secure pump components under high pressure, resisting loosening from vibration—meeting API 6A’s bolting standards. 3GB-00-39 Single round head ordinary flat keys transmit torque between the crankshaft and connecting rod, preventing slippage that can cause pump failure. 3GB-00-34 Bearing glands protect bearings from dust, debris, and corrosive media, extending their service life.

150QMD Series Parts (for QYB40-60L Pneumatic Hydraulic Pump)

150QMD series parts are essential for the QYB40-60L pneumatic hydraulic pump’s power conversion and pressure control. 150QMD-00-18 Cylinder pistons convert gas pressure into hydraulic power, ensuring the pump delivers stable pressure (up to 40MPa) for BOP control systems. 150QMD-00-23 Single head rods transmit power to the piston, maintaining structural integrity even under high vibration. 150QMD-00-22 Reversing springs and 150QMD-00-24 Spring seats ensure smooth piston reversal, preventing jamming and reducing wear. 150QMD-00-09 Air baffles direct airflow to cool the pump, preventing overheating in high-temperature environments. 150QMD-00-38 Seal rings provide reliable seals at various joints, preventing air and fluid leakage that reduces pump efficiency.

Structural Features

Each part is designed with structural features that directly address oilfield pain points, ensuring durability, performance, and ease of maintenance: 1) 3GB-B4A-01 V-type packing: Multi-lip HNBR design that auto-compensates for wear, reducing replacement frequency; precision-cut to ±0.01mm tolerance, with a Shore A hardness of 75 for optimal sealing without extrusion under 38MPa pressure. 2) 3GB-00-15 Cylinder liner: Forged alloy steel with a polished inner surface (Ra ≤ 0.5μm) to reduce friction, with a 12mm wall thickness (3mm thicker than standard parts) to resist pressure impact and corrosion. 3) GB297-64 32215 Tapered Roller Bearing: Double-row roller design with a hardened raceway (HRC 60-64) for wear resistance, capable of withstanding 42,000 vibration cycles and axial loads up to 280kN—ideal for heavy-duty pump operations. 4) 150QMD-00-23 Single head rod: Forged carbon steel with a heat-treated surface to prevent bending, with a precision-machined end (0.003mm tolerance) for perfect alignment with the piston. 5) 3GB-00-17C Packing ring: Flexible graphite material with a stainless steel reinforcement ring, ensuring a tight seal even under 38MPa pressure and temperatures up to 140°C. 6) 3GB-00-06 Valve seat: Hardened steel surface (HRC 58-62) with a precision-ground sealing face, preventing leakage and extending service life to 4800 working hours.

Applicable Working Conditions

These parts are specifically designed for QB21 crankshaft piston pumps, QYB40-60L pneumatic hydraulic pumps (40MPa nominal pressure, 0.65-0.8MPa air source pressure), and 150QMD series auxiliary systems, fully adapting to the harsh working conditions of onshore and offshore oilfields, in line with GB/T 31033-2025 requirements for oil & gas drilling well control. They meet the following key operational parameters: 1) Working Pressure: 0–40MPa (hydraulic systems), 0–1.6MPa (pneumatic systems), complying with API 6A PR2 requirements for high-pressure service. 2) Temperature Range: -40°C to 140°C, adapting to extreme temperature changes in northern oilfields (as low as -40°C) and desert environments (up to 50°C). 3) Media Compatibility: Resistant to hydraulic oil, drilling mud, seawater (salinity ≥35‰), hydrogen sulfide (H₂S concentration ≤1000ppm), and sour gas—meeting JB/T 11484-2025 anti-sulfide stress corrosion cracking (SSCC) requirements. 4) Vibration Resistance: Withstands ≤4.2 mm/s RMS vibration, typical of high-speed drilling (≥120rpm) operations. 5) Typical Applications: QB21 pumps in Daqing Oilfield’s mud circulation systems, QYB40-60L pumps in Bohai Bay Offshore Oilfield’s BOP control systems, and 150QMD parts in Sichuan shale gas wells—all relying on these parts for reliable performance.

Maintenance and Care Recommendations

Based on 40 years of on-site experience from our senior oilfield hydraulic maintenance engineers, and aligned with API 6A, GB/T 31033-2025, and industry best practices, these practical tips will help extend the life of your parts and prevent common failures—avoiding costly downtime: 1) Seal Inspection: Check 3GB-B4A-01 V-type packing, 3GB-00-17C Packing rings, and 150QMD-00-38 Seal rings every 2700 hours of operation. Replace them if the compression set exceeds 11% or if you notice surface cracks. Always clean the seal groove thoroughly before installation—even small scratches (depth greater than 0.03mm) will damage new seals. Apply a thin layer of high-pressure hydraulic lubricant to the seal before installing it. A common mistake we see is reusing old graphite packing, which almost always leads to leakage, especially in high-temperature applications. 2) Bearing and Cylinder Care: Inspect GB297-64 32215 Tapered Roller Bearings every 650 hours for wear or abnormal noise. Lubricate them with high-temperature grease every 300 hours to reduce friction—avoid over-lubrication, as this attracts debris. Check 3GB-00-15 Cylinder liners every 700 hours for deformation; if ovality exceeds 0.02mm, replace immediately to prevent piston jamming. 3) Fastener Torque: Tighten 3GB-00-19 Tie rod nuts and 3GB-00-21 Nuts to the specified values: 205 N·m for tie rod nuts and 100 N·m for standard nuts. Retighten them after 100 hours of operation to prevent loosening under vibration. 4) Storage: Keep unused parts in a cool, dry (≤30°C), dust-free environment. Coat metal parts (like 3GB-00-15 Cylinder liners and GB297-64 32215 Bearings) with anti-rust oil to prevent corrosion, and store packing and seals away from direct sunlight to avoid UV degradation (per GB/T 3512-2001 aging resistance requirements). For 150QMD-00-09 Air baffles, store them in a dry place to prevent internal moisture buildup.

Authority and Enterprise Endorsement

All parts comply with API 6A (21st Edition) for high-pressure wellhead and tree equipment, which sets strict technical requirements for design, material selection, processing, and testing to ensure safety and reliability in oilfield operations. They also meet GB/T 31033-2025 (Technical requirements for well control technology of oil & gas drilling), GB/T 20174-2019 for petroleum drilling well control systems, and ASME B16.34 for pressure-containing components. Dimensional accuracy is guaranteed to ≤0.002mm, and all materials meet API material specifications (AISI 4140 for cylinder liners and rods, HNBR/graphite for seals, high-carbon steel for bearings per GB297-64). Every part undergoes API 6A PR2 testing, including pressure cycle testing (1200 cycles at 40MPa) and leak detection testing (稳压时间不少于10min, 高压试验压降不超过0.7MPa), to ensure compliance with high-pressure service requirements.

With 46 years of experience manufacturing oilfield hydraulic and control parts, we serve over 250 global oilfield service companies, with parts installed in 6800+ oilfield systems worldwide. Our parts have been rigorously tested and proven in extreme oilfield conditions, including 40MPa high-pressure hydraulic circuits, sour gas environments (H₂S ≤1000ppm), and offshore saltwater environments (salinity ≥35‰). We actively contribute to 6 industry standard revisions, including input to the latest GB/T 31033-2025 standard, helping to improve safety and performance across the industry. Our exclusive performance data speaks to our quality: the 3GB-B4A-01 V-type packing outperforms industry standards by 1100 working hours, the GB297-64 32215 Bearing extends service life by 1400 hours, and the 3GB-00-15 Cylinder liner reduces pump jamming incidents by 80% compared to standard liners. We also provide API-compliant maintenance guidance and 24/7 technical support to help users extend equipment life and avoid safety incidents caused by component failure.

We supply the following spare parts:

On-Site Fault Maintenance Cases

The following are 4 real on-site fault maintenance cases, detailing oilfield locations, equipment models, load data, repair measures, repair effects, and customer feedback—showcasing how our parts solve common oilfield equipment problems and deliver reliable performance:

Case 1

Location: Daqing Oilfield, Heilongjiang Province, China
Equipment Model: QB21 Crankshaft Piston Pump (38MPa)
Fault: 3GB-B4A-01 V-type packing wear, leading to hydraulic fluid leakage (pressure dropped from 38MPa to 30MPa)
Load Data: Working pressure 38MPa, vibration 3.8 mm/s RMS, ambient temperature -32°C, hydraulic oil viscosity 50cSt
Repair Measures: Replaced the worn V-type packing with our 3GB-B4A-01 V-type packing, cleaned the seal groove, and conducted a pressure test (稳压10min, 压降0.05MPa)
Repair Effect: No leakage, pressure restored to 38MPa, stable operation for 2100 hours
Customer Feedback: "The new V-type packing fits perfectly with our QB21 pump and solved the leakage issue immediately. It’s durable in cold weather and has kept our mud circulation system running smoothly—avoiding costly downtime."

Case 2

Location: Bohai Bay Offshore Oilfield, China
Equipment Model: QYB40-60L Pneumatic Hydraulic Pump (40MPa)
Fault: 150QMD-00-23 Single head rod bending, causing pump inefficiency (flow rate dropped from 60ML/stroke to 42ML/stroke)
Load Data: Working pressure 40MPa, vibration 4.1 mm/s RMS, ambient temperature 34°C, seawater salinity 37‰, air flow rate 130L/min
Repair Measures: Replaced the bent single head rod with our 150QMD-00-23 Single head rod, aligned the piston, and calibrated flow rate
Repair Effect: Rod remains straight, flow rate restored to 60ML/stroke, stable operation for 2200 hours
Customer Feedback: "The new single head rod fixed our efficiency issue completely. It handles the offshore vibration perfectly and hasn’t bent at all—critical for our BOP control system. We’ll use these rods for all our QYB40-60L pumps."

Case 3

Location: Sichuan Oilfield, Sichuan Province, China
Equipment Model: QB21 Crankshaft Piston Pump (35MPa)
Fault: GB297-64 32215 Tapered Roller Bearing failure, causing abnormal vibration and pump shutdown
Load Data: Working pressure 35MPa, vibration 5.0 mm/s RMS (exceeding safe limit), ambient temperature 42°C, H₂S concentration 950ppm
Repair Measures: Replaced the failed bearing with our GB297-64 32215 Tapered Roller Bearing, lubricated the bearing housing, and adjusted shaft alignment
Repair Effect: Vibration reduced to 3.7 mm/s RMS, pump operates smoothly, no failure after 2000 hours
Customer Feedback: "The new bearing solved our vibration problem instantly. It withstands the sour gas and high temperature in our shale gas well perfectly—we haven’t had any issues since installation. Highly recommended."

Case 4

Location: Middle East Oilfield, Kuwait
Equipment Model: QYB40-60L Pneumatic Hydraulic Pump (36MPa)
Fault: 3GB-00-15 Cylinder liner deformation, causing piston jamming and pump shutdown
Load Data: Working pressure 36MPa, vibration 4.0 mm/s RMS, ambient temperature 49°C, hydraulic oil temperature 67°C
Repair Measures: Replaced the deformed cylinder liner with our 3GB-00-15 Cylinder liner, cleaned the pump body, and lubricated internal components
Repair Effect: No jamming, pump operates smoothly, pressure stable at 36MPa, stable operation for 1900 hours
Customer Feedback: "The new cylinder liner fits perfectly and handles the extreme heat of our desert oilfield. It doesn’t deform like the original part, keeping our QYB40-60L pump running without interruptions. We’ll be ordering these liners for all our pumps."

FAQ (Frequently Asked Questions)

Procurement Guide and Technical Reference Standards

Procurement Reference Standards

When purchasing these QB21, QYB40-60L, and 150QMD series parts, refer to the following standards to ensure quality, compatibility, and safety: 1. API 6A (21st Edition) for high-pressure wellhead and tree equipment parts; 2. GB/T 31033-2025 (Technical requirements for well control technology of oil & gas drilling); 3. GB/T 20174-2019 for petroleum drilling well control systems; 4. ISO 9001:2015 quality management system certification; 5. ASME B16.34 certification for pressure-containing components; 6. GB297-64 for tapered roller bearings. We provide quality inspection reports, API 6A PR2 test reports, dimensional drawings, and non-destructive testing reports for each batch of parts. For bulk orders, we offer customized inspection plans to meet your specific needs. Always confirm your equipment model (QB21, QYB40-60L, 150QMD) and part number to avoid mismatches—provide the equipment serial number for verification, and we will ensure the parts fit perfectly.

Technical Problem Reference Standards

For common technical issues (hydraulic leakage, pump jamming, bearing failure, rod bending), follow these solutions (aligned with API 6A, GB/T 31033-2025, and industry best practices): 1. Leakage: Replace with our 3GB-B4A-01 V-type packing, 3GB-00-17C Packing ring, or 150QMD-00-38 Seal ring, clean the affected components, and conduct pressure tests per API 6A PR2 standards (稳压10min, 高压压降≤0.7MPa); 2. Pump jamming: Replace the 3GB-00-15 Cylinder liner or 150QMD-00-18 Cylinder piston, clean the pump body, and lubricate internal components; 3. Bearing failure: Replace with GB297-64 32215 Tapered Roller Bearings and adjust shaft alignment; 4. Rod bending: Replace with 150QMD-00-23 Single head rod and align the piston. Our technical team provides 24/7 online support to help you troubleshoot and resolve issues quickly, minimizing downtime.

Procurement Guidance

If you need QB21 crankshaft piston pump parts, QYB40-60L pneumatic hydraulic pump components, 150QMD series parts, GB297-64 32215 tapered roller bearings, or any other listed replacement parts for oilfield pumps, contact us directly. We offer flexible procurement options—single parts or bulk orders—to meet your maintenance and operational needs. All products are 100% factory-tested, reliable, and compliant with API, GB, and ASME standards, ensuring your oilfield equipment operates safely and efficiently. We provide detailed specifications, dimension drawings, API test reports, and certification documents to help you make informed purchasing decisions. We do not promise delivery time, but we will prioritize production and supply based on your order urgency to meet your maintenance and operation needs. All parts come with a one-year quality guarantee—we replace defective parts free of charge, helping you reduce operational risks and maintenance costs. Whether you need a single replacement part for an urgent repair or a full set of spare parts for your QB21, QYB40-60L, and 150QMD pump fleet, we have the expertise and supply capacity to support you, ensuring your oilfield operations remain continuous and safe.

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