The bucket pins for the Yanmar B50 excavator typically have a diameter of around 35 millimeters. However, the exact length can vary depending on the bucket model and the manufacturing year of the machine.
When replacing bucket pins, it is recommended to first measure the existing pin dimensions precisely to avoid installation issues caused by size mismatches.
To ensure durability and proper fit, it is best to use genuine OEM parts. If opting for generic replacement pins, one must confirm that the specifications match exactly and pay close attention to material quality to maintain operational safety and efficiency.

This article summarizes a forum thread where multiple users discussed common error codes encountered on Yanmar excavators and their troubleshooting methods. The focus was mainly on engine faults and hydraulic system warnings.
1. Common Error Codes and Their Meanings

• Error Code A: Engine sensor fault, which may involve the intake pressure sensor or temperature sensor abnormalities.
  
• Error Code B: Insufficient hydraulic system pressure, possibly caused by hydraulic pump failure or oil circuit blockage.
  
• Error Code C: Electronic Control Unit (ECU) communication failure, which might be due to loose cable connections or ECU malfunction.
  

• Check Sensors and Wiring
  Verify the sensors’ functionality and ensure all wiring connections are secure, without looseness or breaks.
  
• Hydraulic Oil Inspection
  Regularly check hydraulic oil levels and quality to prevent alarms caused by low oil or degraded oil condition.
  
• Read Error Codes with Diagnostic Tools
  Use professional diagnostic equipment to retrieve precise fault codes rather than guessing or disassembling blindly.
  
• Software Updates
  Some models may resolve electronic faults and false alarms by updating the ECU software.
  

• Users recommend contacting authorized dealers or professional repair technicians when facing complex electronic faults to avoid secondary damage caused by improper disassembly.
  
• Experienced mechanics shared repair workflows and precautions for various Yanmar excavator faults.
  
• Some users suggest purchasing official service manuals and diagnostic tools for quicker and more accurate troubleshooting.
  

This summary is based on an old forum thread where multiple users shared their experiences, pros and cons, and buying advice regarding the Yanmar SV40 excavator.
1. Model Overview
The Yanmar SV40 is a medium-sized crawler excavator suitable for small to medium civil construction, agriculture, and landscaping projects. It balances power and agility, typically offering around 4 tons of operational capacity, making it versatile for various applications.
2. User Experience and Feedback
Power Performance
Users generally agree that the SV40 delivers good power. The engine responds quickly and meets daily construction demands effectively.
Hydraulic System
The hydraulic system runs smoothly and operates responsively. Some users mentioned the need for regular maintenance of hydraulic hoses and seals to prevent oil leaks.
Mobility
The machine offers good maneuverability with precise steering, making it suitable for working in tight or complex environments.
Operator Comfort
The cab is moderately spacious, equipped with a comfortable seat and good visibility, making long hours of operation more manageable.
3. Common Issues

• Hydraulic Oil Leaks
  Some users reported minor hydraulic oil leaks. Regular inspection of hydraulic hoses and connectors is recommended.
  
• Spare Parts Availability
  Certain parts may have longer supply cycles in overseas markets. Buyers should verify parts availability before purchase.
  
• Maintenance Costs
  Overall maintenance costs are moderate, though some parts are slightly more expensive compared to similar brands.
  

• Purchase Channels
  Choose reputable dealers and confirm after-sales service support.
  
• Used Market
  Second-hand SV40 units are reasonably priced, suitable for users with limited budgets but in need of reliable equipment. When buying used, focus on inspecting the hydraulic system and engine condition.
  
• Application Scenarios
  Ideal for diverse work needs, including small to medium earthmoving, landscaping, and farm operations.
  

This summary is based on an old forum thread where multiple users shared their experiences, pros and cons, and buying advice regarding the Yanmar Vio27-3 excavator.
1. Model Overview
The Yanmar Vio27-3 is a popular compact tracked mini excavator suited for landscaping, agriculture, and light construction work. It features a small body and agile operation, capable of working efficiently in confined spaces.
2. User Experience and Evaluation
Power and Operation
Many users find the Vio27-3 has sufficient power for daily tasks. It is easy to operate, especially effective in complex terrain or tight working conditions. The machine is responsive, and steering is flexible.
Durability and Maintenance
Generally, users consider the machine durable. However, some components, such as parts of the hydraulic system, require regular inspection and replacement. Yanmar is noted for good parts supply and after-sales support, although some specific parts may have longer lead times.
Hydraulic System
The hydraulic system performs stably and supports various attachments. Users advise timely hydraulic oil changes to avoid system faults.
Mobility and Comfort
The cab is well-designed with a comfortable seat and ergonomically arranged controls, reducing operator fatigue during prolonged use.
3. Buying Recommendations
Used Market
Many recommend buying a used Vio27-3 due to its reasonable price and stable performance. However, it is important to carefully check the hydraulic system, engine condition, and track wear, and avoid machines with accident damage or severe wear.
Parts and After-Sales
Prospective buyers should understand the local availability of spare parts and quality of after-sales service to prevent maintenance difficulties later.
Suitable Applications
This model is suitable for small-scale construction, landscaping, orchards, and farms, but is not designed for heavy-duty or long-term large-scale projects.
4. Common Issues and Solutions

• Hydraulic Oil Leaks
  Regularly inspect hydraulic lines and promptly repair leaks to prevent larger damage.
  
• Engine Starting Problems
  Some users report difficulties starting the engine in cold regions; using season-appropriate fuel and maintenance can help.
  
• Track Maintenance
  Due to the machine’s light weight, tracks wear relatively easily, so regular adjustment and cleaning are important.
  

A user posted on an old forum seeking advice about buying a used Hitachi UH083LC excavator — a model from the late 1980s to early 1990s. Because of its age, he was unsure about maintenance costs, operational performance, and parts availability, so he asked experienced members for their opinions.
1. Main Concerns from the Original Poster

• The machine is inexpensive but has high working hours.
  
• Concerned whether old machines tend to leak oil or have loose structures.
  
• Worried about the difficulty of sourcing spare parts.
  
• Curious about how this model performs compared to other excavators in the same tonnage class.
  

A user on an old forum asked whether Yanmar mini excavators are worth purchasing, especially for farm use, site maintenance, and basic earthwork. He also wanted to know how Yanmar compares with other brands like Kubota, Hitachi, and Komatsu.
1. Advantages of Yanmar Mini Excavators
Several users with Yanmar experience shared highlights:
✅ Reliable Engine Performance
Yanmar is well-known for its diesel engines. Many users find Yanmar mini excavators to have powerful, fuel-efficient, and durable engines.
✅ Good Build Quality and Smooth Operation
Most praise Yanmar’s mature hydraulic system design for smooth, responsive movements and stable operation, making them easy to handle.
✅ Ideal for Small-Scale Site Work
Users generally agree that Yanmar mini excavators have a compact structure, perfectly suited for farms, small homesteads, orchards, and other limited-space operations.
2. Comparison with Other Brands
Some users shared their views comparing Yanmar to Kubota, Hitachi, and Komatsu:

• Compared to Kubota:
  Many feel Yanmar and Kubota are similarly reliable. However, Kubota has a wider dealer and parts network in North America and some regions, while Yanmar’s network is somewhat smaller.
  
• Compared to Hitachi and Komatsu:
  Yanmar tends to be cheaper and simpler for smaller tonnage machines. For larger excavators, Komatsu or Hitachi may offer more options.
  

• Digging ditches, laying pipes, or pond excavation on farms
  
• Site repair and surface leveling
  
• Light grading with dozer blade attachments
  

A user posted on an old forum seeking advice. He plans to buy a mini excavator mainly for digging ditches and site clearing on his own property. Since it’s his first time dealing with such equipment, he’s unsure which brand or size to choose and what details to watch out for. He asked experienced members for help.
1. The User’s Needs
The original poster described:

• Mainly for personal use, occasionally helping neighbors with small jobs.
  
• Wants easy operation and low maintenance.
  
• Has a limited budget and prefers buying secondhand.
  

• Some pointed out that if you only occasionally dig ditches, a tractor with a rear backhoe attachment can suffice. It costs less and is multi-purpose.
  
• However, compared with a genuine mini excavator, a backhoe attachment has much lower efficiency, power, and operational flexibility.
  
• For slightly bigger workloads, most recommend going straight for a proper mini excavator, which is easier to use in the long run.
  

• Most suggest choosing mini excavators around the 3–4 ton class. This weight won’t damage your yard or lawn much, but is much more practical in terms of digging depth and efficiency compared to smaller 1–2 ton models.
  
• Very small machines (around 1 ton) tend to have weak power and slow actions, and can struggle in hard soil or rocky conditions.
  

• The majority recommend mainstream brands like Kubota, Hitachi, and Komatsu because:
  • Reliable quality
    
  • Easier to find parts
    
  • Plenty of repair shops
    
• Users advise avoiding obscure brands or “gray market” imports, which can be difficult to maintain due to scarce spare parts.
  

• Always test the machine yourself: check smooth startup, hydraulic performance (no shaking or leaks), track wear, and swing rotation flexibility.
  
• Inspect hydraulic hoses and cylinders carefully for welding repairs or oil leaks.
  
• Verify the hour meter authenticity, as some machines have tampered low hours.
  
• Reserve budget for maintenance like track replacement and hydraulic pump repairs, which can be costly.
  

• It’s recommended to pick a model with a dozer blade, which helps level the ground and stabilizes the machine on soft terrain.
  
• If you plan to handle logs or rocks, a hydraulic thumb attachment is very helpful for gripping materials.
  

Quote:“Spend time comparing and testing upfront, so you won’t regret it later.”

A user posted on an old forum expressing interest in two machines spotted at an auction: a John Deere (JD) 190E excavator and a JD 450B bulldozer. He asked other members whether these two machines are worth buying and what precautions he should take.
1. The Original Question
The poster mentioned planning to try his luck at the auction after seeing these two machines in seemingly good condition. He wanted to know if they would be suitable for personal use or small-scale construction. He also admitted limited knowledge about these models and sought advice from experienced users.
2. Forum Members’ Discussion and Suggestions
Several experienced members responded actively:
JD 190E Excavator

• Some pointed out that the JD 190E is actually a model produced by Hitachi (a variant of the Hitachi EX60 series) but rebranded with the John Deere name. Hitachi’s small excavators have a good reputation and are relatively easy to maintain.
  
• Users advised confirming parts availability before buying. Since the JD 190E is an older model, some parts overlap with North American John Deere machines, but others require sourcing Hitachi-compatible or imported components.
  
• If in good condition, this model is very suitable for small earthworks, ditch digging, or farm maintenance. It offers high cost performance and is relatively simple to operate.
  

• Members noted that the JD 450B bulldozer is a classic model popular in the 1970s–80s, known for its simple, durable structure and relatively easy-to-find parts.
  
• However, due to its age, special attention should be paid to undercarriage wear, track tension, and hydraulic system leaks.
  
• It was emphasized that excessive undercarriage wear can lead to expensive repairs (replacing tracks, sprockets, rollers, etc.). Therefore, it is crucial to carefully inspect these areas on-site during the auction rather than judging by appearance alone.
  

• Auction prices are often below market value. Sometimes, well-maintained equipment can be found, saving significant purchase costs.
  

• Machines are usually sold “as is” without warranties or after-sales support.
  
• Auctions provide limited inspection time, often without the chance for a thorough test run, increasing the risk of hidden defects.
  

• Attend the auction in person, test the machine when cold, listen to the engine, check hydraulics, and verify operational responsiveness.
  
• Bring along a mechanically knowledgeable friend to assist with inspection.
  
• Research comparable machines’ prices on the secondhand market to avoid overbidding.
  

• If in good condition and reasonably priced, the JD 190E excavator and JD 450B bulldozer are classic, reliable machines well-suited for farm work and small construction projects.
  
• However, buying at auction requires caution. Don’t be lured by low prices without thorough inspection. Always reserve budget for future maintenance.
  
• Pay particular attention to undercarriage wear (especially for bulldozers) and hydraulic component aging.
  
• For first-timers at auctions, thorough preparation and bringing a trusted expert can greatly reduce the risk of buying a problematic machine.
  

Quote:“Auction prices may be cheap, but inspect carefully and bid cautiously. Only then can you enjoy peace of mind and save costs in the long run.”

A user on an old forum posted asking for advice about purchasing a 1993 CAT 307 SSR excavator. However, this machine is a “gray market” model imported unofficially. The user wanted to hear others’ opinions and suggestions.

1. What Is a “Gray Market” Machine?

Experienced users explained that a “gray market” machine refers to a used excavator imported through unofficial channels from Japan or other countries. These machines typically:

• Are not certified or authorized by the original manufacturer.
  
• Lack official warranty and after-sales support.
  
• Are usually cheaper than genuine local models, but pose challenges for parts, service, and technical support.
  
• Often have configurations, nameplates, and manuals in Japanese.
  
• May use parts that differ from the North American models.
  

• ✅ First confirm if there is a reliable CAT repair shop nearby willing to service a gray market machine.
  
• ✅ Before buying, bring a professional mechanic to do a thorough inspection, focusing on hydraulics, oil lines, swing gear wear, and track tension.
  
• ✅ Try to obtain the machine’s Japanese or English service manual to aid future parts sourcing.
  
• ✅ Older machines require extra caution: a 1993 model is already 30+ years old, so be prepared financially for possible major overhauls.
  

In an old thread from the previous forum, several users engaged in an in-depth discussion about "Mini Excavators." They shared their experiences regarding selection, usage, advantages, disadvantages, and compared them with tractor-mounted backhoes. This provides valuable insights for newcomers considering purchasing such machines.
1. Comparison Between Mini Excavators and Tractor-Mounted Backhoes
Participants in the discussion generally believe that mini excavators (also known as "crawler mini excavators") offer advantages over tractor-mounted backhoes in terms of digging efficiency, flexibility, and operational comfort:

• Operational Flexibility: Mini excavators can rotate 360 degrees and have independent boom designs, making them particularly convenient for working in narrow spaces or close to walls. In contrast, tractor-mounted backhoes are limited by their fixed installation, restricting their working range.
  
• Superior Digging Capacity: For machines of similar size, mini excavators typically have stronger digging force, greater digging depth, and better reach compared to tractor-mounted backhoes.
  
• Versatility: With additional attachments like bulldozer blades and thumb grabs, mini excavators perform excellently in tasks such as forestry, site leveling, and trenching.
  

• Selection Based on Usage: If the task is occasional digging on personal land or clearing drainage, a tractor-mounted backhoe may suffice. However, for complex sites requiring frequent deep digging or challenging soil conditions, investing in a mini excavator would be more efficient and hassle-free.
  
• Track Type: For operations in forests and uneven outdoor terrains, some users prefer steel tracks for their durability, though they can cause more damage to lawns and surfaces. Rubber tracks are suitable for landscaping and tasks that require ground protection.
  
• Attachments and Maintenance: Users emphasize the importance of considering whether the machine comes with attachments like bulldozer blades and thumb grabs, as these are highly practical in real-world usage. Additionally, when dealing with imported second-hand mini excavators, it's crucial to check the compatibility of spare parts and ease of maintenance. It's advisable to confirm these details with local dealers beforehand.
  
• Operational Safety: One user shared their experience: before starting work, always ensure the working surface is level. Otherwise, there's a risk of the tracks slipping or the machine tipping over. Using a tilt indicator, stabilizing supports, and adopting cautious operating habits are essential.