Roller Assy (612738-A), Shifter Ring Assy (619319-A) & Gearbox/Clutch Spare Parts

Product Introduction

We specialize in the production and supply of high-precision, OE-compatible spare parts for industrial gearboxes, mechanical clutches, and transmission systems, covering core components such as 612738-A ROLLER ASSY, 619319-A ASSY SHIFTER RING, 628421 CLUTCH, GEAR TOOTH, ZS-7080 BEARING, and more than 30 other key parts listed. All our products are precision-engineered to match specific equipment models, including heavy-duty industrial gearboxes, mechanical transmission systems, and clutch assemblies for drilling rigs, construction machinery, and mining equipment—directly addressing the core operational needs of target users for reliable, compatible, and durable transmission and clutch spare parts.

Our target users are segmented into three core groups to meet their specific, tailored needs: 1) Industrial maintenance teams that require high-quality replacement parts (e.g., bearings, bushings, shifters) to repair gearboxes and clutches, minimizing unplanned downtime; 2) Equipment rental companies that prioritize long-service-life components (e.g., roller assemblies, sprockets, bearing races) to reduce replacement costs and enhance fleet availability; 3) Manufacturing and processing plants that need OE-compatible parts (e.g., retaining rings, thrust spacers, grease packing) to maintain the smooth operation of their transmission systems. We solve the industry’s common pain points of low-quality, mismatched replacement parts—such as poor fit, premature wear, gear slipping, clutch failure, and transmission jamming—which often lead to increased operational costs, production delays, and equipment damage.

Core Purpose

The core purpose of our full range of gearbox and clutch spare parts (including 612738-A Roller Assy, 619319-A Shifter Ring Assy, 628421 Gear Tooth Clutch, and ZS-7080 Bearing) is to provide 100% OE-compatible, high-performance replacements that ensure the safe, stable, and efficient operation of industrial transmission and clutch systems. Each part is manufactured in strict compliance with API Q1, ISO 9001:2015, and original equipment manufacturer (OEM) specifications, eliminating the need for modifications during installation. Our parts support the normal operation of key transmission functions—including gear shifting, power transfer, load bearing, and friction control—helping users reduce maintenance time, lower replacement costs, avoid unplanned downtime, and ensure compliance with industrial operational safety standards.

Function Description

Every part in our product range plays a critical role in keeping gearboxes, clutches, and transmission systems running smoothly, with key functions explained in simple, natural language (no technical jargon):

• 612738-A ROLLER ASSY: A key rotating component in gearboxes and transmission systems that reduces friction between moving parts (e.g., gears, shafts). It ensures smooth rotation, distributes load evenly, and prevents premature wear of adjacent components.

• 619319-A ASSY SHIFTER RING: Controls the engagement and disengagement of gears in the gearbox, allowing operators to switch between high and low gears smoothly. It ensures precise gear alignment, preventing gear slipping or jamming during operation.

• 628421 CLUTCH, GEAR TOOTH: Transmits or cuts off power between the engine and transmission system. It uses gear tooth engagement to ensure reliable power transfer, allowing the equipment to start, stop, and change speed without damaging the transmission.

• ZS-7080 BEARING: Supports rotating shafts in gearboxes and clutches, reducing friction and ensuring stable rotation even under heavy loads. It absorbs radial and axial forces, extending the service life of the entire transmission system.

• Other Key Parts: Components like 606660 Drilled Hex Head Screw (for securing parts), 612747 Grease Pipe Packing (for sealing grease pipes), 645857 High Clutch Sprocket (for power transfer), and 645895 Bushing (for reducing friction) work together to ensure the coordinated, safe operation of gearboxes and clutches.

Structural Features

General Structural Advantages

All our gearbox and clutch spare parts are designed with durability, compatibility, and ease of use as top priorities, featuring the following key structural benefits that meet industry standards:

• High-Quality Material Selection: Bearings (ZS-7080, 645845-1 Box Bearing) are made of high-grade alloy steel with heat treatment to enhance hardness, wear resistance, and load-bearing capacity. Sprockets (645857, 645858) and gears (628421 Gear Tooth Clutch) use carbon steel or alloy steel for strength and durability. Sealing parts (612747 Grease Pipe Packing) use high-temperature resistant rubber to prevent grease leakage.

• Precision Machining: We use CNC machining and precision grinding technologies to ensure all parts meet tight dimensional tolerances (±0.01mm for key dimensions), so they fit perfectly with OEM equipment. For example, 619319-A Shifter Ring Assy and 641013 Outer Race have precise dimensions to ensure smooth gear shifting and bearing rotation.

• Wear & Corrosion Resistance: Critical components (roller assemblies, bearings, sprockets) are treated with carburizing, nitriding, or zinc plating to enhance wear and corrosion resistance. This ensures they perform reliably in harsh industrial environments with dust, moisture, and high temperatures.

• Easy Installation & Maintenance: Parts are designed to match OEM installation structures, with standard interfaces, pre-drilled holes, and clear alignment marks—allowing maintenance teams to install and replace them quickly with common tools. For example, 645880 Bearing Box Cover and 606660 Drilled Hex Head Screw can be installed in minutes without special equipment.

Key Part-Specific Structural Features

• 612738-A Roller Assy: Precision-machined roller surface with a smooth finish to reduce friction. It features a robust core design to withstand heavy loads and high rotational speeds, ensuring long-term stability in gearbox operations.

• 619319-A Shifter Ring Assy: Ergonomic tooth design that ensures precise engagement with gears, preventing slipping. It has a durable coating to reduce wear from repeated gear shifting, extending service life.

• ZS-7080 Bearing: Double-row ball design for enhanced load-bearing capacity, supporting both radial and axial forces. It features a sealed structure to prevent dust and debris from entering, reducing maintenance frequency.

Applicable Working Conditions

Our spare parts are engineered to adapt to the harsh and complex working environments of industrial operations, including drilling, construction, mining, and manufacturing, with clear applicability to the following scenarios:

• Industrial Gearboxes: Suitable for heavy-duty gearboxes used in drilling rigs, construction machinery (e.g., excavators, loaders), and mining equipment. Parts like 612738-A Roller Assy, 619319-A Shifter Ring Assy, and ZS-7080 Bearing are optimized for high-load, high-speed operation.

• Mechanical Clutch Assemblies: Compatible with gear tooth clutches (628421), high/low clutch hubs (645848, 645854), and sprockets (645857, 645858) used in transmission systems, ensuring reliable power transfer and gear shifting.

• Harsh Industrial Environments: Resistant to dust, moisture, high temperatures (up to 120℃), and heavy vibration. Parts like 612747 Grease Pipe Packing and 645880 Bearing Box Cover prevent contamination and protect internal components.

• Continuous Operation Scenarios: Suitable for 24/7 continuous industrial operations, with high fatigue resistance. For example, 645857 High Clutch Sprocket and 645858 Low Clutch Sprocket are designed to withstand repeated power transfer without wear.

Maintenance and Care Recommendations

Proper maintenance of gearbox and clutch spare parts is essential to extend their service life and ensure the safe, efficient operation of transmission systems. Below are simple, practical tips (no professional tools required for daily checks):

Routine Inspection (Daily/Weekly)

• Check bearings (ZS-7080, 645845-1 Box Bearing) weekly for unusual noises, overheating, or vibration. If any of these occur, inspect for wear or damage and replace if needed to prevent transmission failure.

• Inspect 612747 Grease Pipe Packing and grease pipes (645861) daily for grease leakage. Add high-temperature gear grease regularly to keep moving parts lubricated, reducing friction and wear.

• Check 619319-A Shifter Ring Assy weekly for smooth gear shifting. If shifting becomes difficult or gears slip, inspect the shifter ring for wear and replace if necessary.

Cleaning and Lubrication (Monthly)

• Clean roller assemblies (612738-A), sprockets (645857, 645858), and gears (628421) monthly to remove dust, debris, and old grease. Use a soft brush and neutral detergent—avoid harsh chemicals that may damage the surface.

• Lubricate bearings (ZS-7080), bushings (645895), and shifter rings (619319-A) with high-temperature gear grease to ensure smooth operation. Apply grease evenly to all moving surfaces, and remove excess grease to prevent contamination.

• Clean 645880 Bearing Box Cover and inspect for damage. Replace the cover if it is cracked or worn to prevent dust and debris from entering the bearing box.

Storage Requirements (Long-Term Storage)

• Store spare parts in a dry, well-ventilated warehouse, away from direct sunlight and moisture. Use waterproof covers for bearings (ZS-7080), roller assemblies (612738-A), and sprockets to prevent rust or damage.

• Store small parts (e.g., 606660 Drilled Hex Head Screw, 645863 Key, 641440 Shim) in sealed plastic bags to prevent dust and moisture. Label each bag with the part number and model for easy retrieval.

• Store bearings and roller assemblies in a horizontal position on soft supports to avoid scratches or damage to their surfaces. Apply a thin layer of grease to protect them from rust during storage.

On-Site Fault Repair Cases (Real Scenarios)

Below are 3 real on-site repair cases, showing how our spare parts solve practical problems and reduce downtime for users:

Case 1: Roller Assy (612738-A) Replacement for Industrial Gearbox

Fault Description: A manufacturing plant’s industrial gearbox experienced increased noise and vibration, leading to reduced efficiency. The maintenance team identified that the original 612738-A Roller Assy was worn and damaged, causing friction between gear components.

Repair Process: The team replaced the worn roller assembly with our 612738-A Roller Assy. They disassembled the gearbox, removed the old roller, cleaned the installation area, and installed the new roller—no modifications needed. The entire process took 1 hour.

Result: The gearbox noise and vibration stopped completely, and efficiency returned to normal. Our roller assembly has maintained stable performance for 9 months, with no signs of premature wear, eliminating unplanned downtime and gearbox damage.

Case 2: Gear Tooth Clutch (628421) Replacement for Drilling Rig Transmission

Fault Description: A drilling rig’s transmission system failed to transfer power, causing the rig to shut down. The maintenance team found that the original 628421 Gear Tooth Clutch was worn, with damaged teeth that prevented proper engagement with gears.

Repair Process: Our 628421 Gear Tooth Clutch was used to replace the damaged one. The team removed the old clutch, cleaned the transmission cavity, and installed the new clutch. They tested the transmission to ensure smooth power transfer and gear engagement.

Result: The transmission system resumed normal operation, and the drilling rig was back to work within 2 hours. Our gear tooth clutch’s durable design has withstood heavy loads for 8 months, ensuring reliable power transfer and avoiding further downtime.

Case 3: ZS-7080 Bearing Replacement for Construction Machinery Gearbox

Fault Description: An excavator’s gearbox overheated and locked up, caused by a failed ZS-7080 Bearing. The old bearing was worn and seized, preventing the shaft from rotating and stopping the excavator from operating.

Repair Process: The maintenance team replaced the old bearing with our ZS-7080 Bearing. They removed the gearbox cover, extracted the seized bearing, cleaned the shaft and bearing seat, and installed the new bearing. The repair took 1.5 hours.

Result: The gearbox cooled down and resumed normal rotation, and the excavator was back in operation. Our ZS-7080 Bearing’s load-bearing capacity and heat resistance have kept the gearbox running smoothly for 7 months, eliminating overheating issues and unplanned downtime.

FAQ (Frequently Asked Questions)

Procurement & Technical Reference Standards

Procurement Reference Standards (For Easy Purchasing)

To ensure you buy the correct parts and get the best value, follow these simple procurement guidelines:

• Confirm Part Details: Provide the exact part number (e.g., 612738-A, 619319-A, ZS-7080) and equipment model when placing an order. If you don’t have the part number, share a photo of the old part or equipment model, and we will help you match the correct part.

• Check Quality Certifications: All our parts come with API Q1 and ISO 9001:2015 certifications. We can provide material test reports (MTR) and quality inspection certificates upon request, ensuring you get high-quality, reliable products that meet industrial standards.

• Bulk Order Benefits: For regular customers or large orders (e.g., bulk bearings, screws, shims), we offer competitive pricing and customized stock solutions to meet your long-term operational needs, reducing your overall procurement costs.

Technical Problem Reference Standards (For Troubleshooting)

For common problems during use, use these practical solutions to minimize downtime:

• Gearbox Noise/Vibration: If a gearbox makes unusual noise or vibrates, check the roller assembly (612738-A) or bearing (ZS-7080) for wear. Replace the faulty part to restore smooth operation.

• Clutch Failure: If a gear tooth clutch (628421) fails to engage or transfer power, inspect the clutch teeth for damage. Replace the clutch with our compatible part to ensure reliable power transfer.

• Gear Shifting Issues: If gear shifting is difficult or gears slip, check the 619319-A Shifter Ring Assy for wear or misalignment. Replace the shifter ring to ensure precise gear engagement.

Conclusion & Procurement Guidance

Our full range of gearbox and clutch spare parts—including 612738-A Roller Assy, 619319-A Shifter Ring Assy, 628421 Gear Tooth Clutch, and ZS-7080 Bearing—are designed to solve your core operational challenges: unplanned downtime, high replacement costs, and incompatible parts. With strict quality control, precision manufacturing, and 100% OEM compatibility, our parts ensure your industrial transmission systems, gearboxes, and clutches run safely, stably, and efficiently in even the harshest industrial environments.

We understand that reliable spare parts are critical to keeping your operations on track and reducing costs. Whether you need a single part for emergency repair, routine maintenance parts, or bulk stock for long-term operations, we have the solution to meet your needs. Our parts are backed by industry-leading quality certifications and professional technical support, ensuring you get the right part for the job every time.

To keep your industrial equipment running without interruption, we invite you to purchase our high-quality spare parts. Simply provide the part numbers you need (e.g., 612738-A, 619319-A, ZS-7080) or your equipment specifications, and we will provide you with competitive pricing and reliable supply solutions. We are committed to becoming your trusted partner for gearbox and clutch spare parts, supporting your success with durable, compatible, and cost-effective components.

contact us ：

Emeil: [email protected]   whatsapp: +86 15275658619

Should you have any purchase intentions, please contact us – we will offer you our most favorable price.