Are Auxiliary Hydraulics a Dealer Option or Factory Standard

[MikePhua]

The Role of Auxiliary Hydraulics in Modern Equipment
Auxiliary hydraulics are essential for powering attachments beyond the base functions of a machine. Whether operating a hydraulic hammer, auger, grapple, or brush cutter, auxiliary circuits provide the flow and pressure needed to drive external tools. These systems typically include additional valves, hoses, couplers, and controls integrated into the machine’s hydraulic architecture.
In compact excavators, skid steers, and backhoes, auxiliary hydraulics have become a defining feature of versatility. Without them, the machine is limited to its bucket or blade. With them, it becomes a multi-tool platform capable of adapting to dozens of tasks.
Factory Install vs Dealer Option
Whether auxiliary hydraulics are included from the factory or added later depends on the manufacturer, model, and market. Some machines—especially those in premium or high-spec configurations—come with auxiliary hydraulics as standard. Others offer them as optional packages, either installed at the factory or by the dealer before delivery.
Typical configurations include:

• Primary auxiliary circuit: Single-direction flow for tools like breakers
  
• Secondary circuit: Bi-directional flow for rotating attachments
  
• High-flow package: Increased GPM for demanding tools like cold planers
  
• Case drain line: Low-pressure return for motor-driven attachments
  

Manufacturers like Caterpillar, Kubota, and Bobcat often offer multiple hydraulic packages tailored to specific industries. In Shanghai, a contractor purchasing a mid-range compact track loader found that the base model lacked auxiliary hydraulics, but the dealer offered a retrofit kit with factory-grade components.
Dealer-Installed Systems and Retrofit Considerations
Dealer-installed auxiliary hydraulics can be a practical solution, especially when upgrading an existing fleet. However, several factors must be considered:

• Compatibility: Ensure the machine’s pump and control system can handle the added flow
  
• Routing: Hoses must be protected from abrasion and heat, especially near pivot points
  
• Control integration: Joystick buttons or foot pedals must be mapped correctly
  
• Warranty impact: Confirm that dealer-installed systems do not void factory coverage
  
• Component quality: Use OEM or high-grade aftermarket valves and couplers
  

Some dealers offer plug-and-play kits with pre-bent lines, quick couplers, and electronic control modules. Others fabricate custom setups based on the machine’s configuration and intended use.
In Ohio, a fleet manager retrofitted auxiliary hydraulics to a dozen compact excavators to support mulching operations. After standardizing the kits and training operators, attachment productivity increased by 40%.
Hydraulic Flow and Pressure Parameters
When adding auxiliary hydraulics, matching flow and pressure to the attachment is critical. Key parameters include:

• Flow rate: Typically 10–30 GPM for compact machines
  
• Pressure: Usually between 2,500–3,500 psi
  
• Return line capacity: Must handle full flow without restriction
  
• Cooling: High-flow systems may require additional oil coolers
  

Attachments often specify minimum and maximum operating ranges. Exceeding these can damage seals, overheat motors, or reduce tool life. Some operators install inline pressure gauges and flow meters to monitor performance in real time.
Control Systems and Operator Interface
Modern machines use electro-hydraulic controls to manage auxiliary functions. These may include:

• Joystick thumb rollers
  
• Foot pedals
  
• Toggle switches
  
• Touchscreen menus with flow adjustment
  

Advanced systems allow proportional control, flow modulation, and memory presets for different attachments. In Alberta, a contractor equipped his fleet with programmable joysticks, allowing operators to switch between grapple and auger modes without leaving the cab.
Maintenance and Troubleshooting
Auxiliary hydraulic systems require regular inspection and care:

• Check couplers for leaks and wear
  
• Replace filters every 500 hours
  
• Inspect hoses for cracking or abrasion
  
• Flush the system annually to remove contaminants
  
• Monitor fluid temperature during extended use
  

Some operators install magnetic traps or inline screens to catch debris before it reaches the attachment. Others use color-coded couplers to prevent misconnection.
Conclusion
Auxiliary hydraulics are both a factory option and a dealer-installed upgrade, depending on the machine and market. Whether included at purchase or added later, they unlock the full potential of construction equipment by enabling a wide range of attachments. With proper design, installation, and maintenance, auxiliary systems transform machines into adaptable, high-performance tools ready for any jobsite challenge.