back tender cylinder Interview Questions and Answers

1. What is a back tender cylinder?

   • Answer: A back tender cylinder, also known as a rear tender cylinder or auxiliary cylinder, is a secondary hydraulic cylinder used in heavy machinery, typically in conjunction with a main cylinder, to provide additional force or control during specific operations. It often assists in the return stroke or provides supplementary power for tasks requiring higher force than the main cylinder alone can deliver.

2. What are the common applications of a back tender cylinder?

   • Answer: Common applications include assisting the return stroke of a boom on an excavator, providing extra power for clamping operations in a press, or aiding in the retraction of a lift mechanism in heavy equipment. They're often found in construction machinery, industrial presses, and other heavy-duty applications.

3. How does a back tender cylinder differ from a main cylinder?

   • Answer: The main cylinder performs the primary function, while the back tender cylinder offers supplemental force or control. The back tender cylinder is usually smaller than the main cylinder and is designed to assist, not replace, the main cylinder's function. They may also have different operating pressures and speeds.

4. What are the advantages of using a back tender cylinder?

   • Answer: Advantages include increased lifting capacity, faster return strokes, smoother operation, reduced strain on the main cylinder, and the ability to handle more complex tasks requiring variable forces.

5. What are the disadvantages of using a back tender cylinder?

   • Answer: Disadvantages include increased complexity of the hydraulic system, higher initial cost, potential for additional points of failure, and increased maintenance needs.

6. What types of seals are commonly used in back tender cylinders?

   • Answer: Common seal types include U-cups, O-rings, and various types of polyurethane seals. The specific seal type depends on the operating pressure, fluid type, and operating conditions.

7. How is the back tender cylinder mounted to the machine?

   • Answer: Mounting methods vary depending on the application but often involve brackets, clevis pins, or custom-engineered mounting solutions. The mounting must ensure proper alignment and secure attachment to withstand operating forces.

8. What are the common causes of back tender cylinder failure?

   • Answer: Common causes include seal failure due to wear or damage, rod bending or breakage, internal leakage, contamination of the hydraulic fluid, and improper maintenance.

9. How is the performance of a back tender cylinder monitored?

   • Answer: Performance is monitored through visual inspections for leaks, damage, or unusual wear. Pressure gauges can monitor operating pressure, while flow meters can assess fluid flow rates. Regular maintenance schedules also contribute to early detection of issues.

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