1955 Hough HA Payloader: Hydraulic Fluid Specifications and Maintenance

[MikePhua]

Introduction
The 1955 Hough HA Payloader, a product of the Frank G. Hough Company, marked a significant advancement in wheel loader technology during the mid-20th century. As the smallest model in Hough's lineup, the HA was designed for versatility and reliability in various material handling applications. Understanding the hydraulic fluid specifications and maintenance procedures is crucial for preserving the performance and longevity of this vintage machine.
Hydraulic System Overview
The Hough HA Payloader's hydraulic system is integral to its operation, powering the loader arms and bucket for efficient material handling. Maintaining the correct hydraulic fluid levels and using the appropriate type of fluid are essential for optimal performance.
Hydraulic Fluid Specifications

• Type of Fluid: The recommended hydraulic fluid for the Hough HA Payloader is SAE 10W motor oil. This choice ensures proper lubrication and operation of the hydraulic components.
  
• Initial Filling: Upon initial operation, after the first 32 to 48 hours, the hydraulic system should be drained and refilled with clean SAE 10W motor oil. This practice helps remove any contaminants and ensures the system operates efficiently.
  
• Operating Conditions: In hot weather or when the Payloader operates in temperatures above 90°F (32°C), it may be beneficial to refill the system with SAE 20 motor oil. This adjustment can improve operation under such conditions.
  

Maintenance and Service Intervals

• Drain and Refill: After the initial 32 to 48 hours of operation, drain the hydraulic system and refill with clean SAE 10W motor oil. Subsequently, drain and clean the system every 1,000 hours of operation or more frequently if working conditions are unusually dirty and dusty.
  
• Suction Line Strainer Cleaning: At each oil change, clean the suction line strainer to prevent debris from entering the hydraulic system, which can cause pump or valve failure.
  

Torque Converter and Transmission Fluid
The Hough HA Payloader utilizes a torque converter and transmission system that also requires proper lubrication.

• Fluid Type: Type "A" transmission fluid is recommended for use in the torque converter system. This fluid should be changed every 2,000 hours of operation.
  
• Filter Maintenance: The converter filter element should be changed every 500 hours to maintain optimal performance.
  

Conclusion
Proper maintenance of the hydraulic and transmission systems in the 1955 Hough HA Payloader is essential for ensuring its longevity and reliable performance. Adhering to the recommended fluid types and service intervals will help preserve the machine's functionality and efficiency. As with any vintage equipment, regular maintenance and attention to detail are key to keeping the Hough HA Payloader operating smoothly for years to come.