CAT 236B3: No Aux Hydraulic Option – Understanding the Issue and Solutions

[MikePhua]

Introduction
The CAT 236B3 is a compact track loader known for its power, versatility, and maneuverability in construction and landscaping tasks. One of the key features many operators expect from their machines is the ability to use auxiliary hydraulics to power additional attachments. However, some users have reported that their CAT 236B3 does not have an auxiliary hydraulic option, which can limit the types of attachments that can be used effectively with the machine. This article discusses why the auxiliary hydraulic option may be unavailable on some models, and offers solutions for operators looking to add this functionality.
Understanding Auxiliary Hydraulics
Auxiliary hydraulics are crucial for running a wide range of attachments, such as augers, hydraulic breakers, grapples, and trenchers. These attachments require an additional hydraulic circuit, separate from the primary hydraulics of the loader, to function. The ability to power such attachments makes a compact loader like the CAT 236B3 more versatile and increases its overall productivity on job sites.

1. Primary Hydraulic System vs. Auxiliary Hydraulics
   • The primary hydraulic system is responsible for moving the loader arms and controlling the loader bucket.
     
   • Auxiliary hydraulics, on the other hand, are used to operate external hydraulic attachments, providing extra power and control for specialized work.
     

Why Some CAT 236B3 Models Lack the Auxiliary Hydraulic Option
There are several reasons why some CAT 236B3 models may not come with the auxiliary hydraulic option. Understanding these reasons can help operators find solutions if they wish to add or activate the feature.

1. Standard vs. Optional Features
   On many compact track loaders, auxiliary hydraulics may be an optional feature that needs to be specifically selected when purchasing the machine. Some base models of the CAT 236B3 may not include the auxiliary hydraulic system as standard, which means the loader will be limited to basic functions without the ability to run additional attachments.
   • Solution: If you have purchased a base model without auxiliary hydraulics, you may need to retrofit the machine with the required components.
     
2. Model Configuration Differences
   Not all model configurations of the CAT 236B3 may come equipped with auxiliary hydraulics. Depending on the year of manufacture, specific model variations, and market requirements, some loaders are built with or without the auxiliary hydraulic system.
   • Solution: Check the serial number and configuration of your CAT 236B3 to confirm whether the machine was built with the option. If not, you can consider adding the auxiliary hydraulic option through a retrofit.
     
3. Hydraulic System Limitations
   Some compact loaders, especially those from earlier model years or those with specific engine configurations, may have limitations in their hydraulic systems that prevent them from supporting the auxiliary hydraulic function. These limitations can be related to the hydraulic pump's size, flow rate, or overall power output.
   • Solution: For models with hydraulic limitations, you may need to upgrade the hydraulic system by installing a higher-flow pump or modifying the current system to provide the necessary power for auxiliary attachments.
     

Solutions for Adding Auxiliary Hydraulics
If you own a CAT 236B3 without the auxiliary hydraulic option, there are several solutions to retrofit or add the functionality.

1. Hydraulic Kit Installation
   CAT and other third-party manufacturers offer hydraulic kits designed to add auxiliary hydraulics to machines that were not originally equipped with them. These kits typically include all the necessary components, such as pumps, hoses, valves, and controls, to integrate auxiliary hydraulics into your loader.
   • Steps for Installation:
     • Purchase a hydraulic kit that is compatible with your CAT 236B3.
       
     • The kit should include detailed instructions, and installation may involve mounting a secondary hydraulic pump, running hoses, and wiring the control switch to the operator’s console.
       
     • Depending on the complexity of the kit, installation may be performed by a qualified technician.
       
2. Upgrading the Hydraulic System
   For loaders with limited hydraulic power, upgrading the hydraulic system is another viable option. This may involve replacing the hydraulic pump with one that provides a higher flow rate or adding a dedicated auxiliary pump to support attachments.
   • Steps for Upgrading:
     • Consult with CAT or a hydraulic specialist to determine the best pump upgrade for your machine.
       
     • The upgrade may also require modifications to the hydraulic lines and valves to handle the increased flow of fluid.
       
3. Auxiliary Hydraulic Valves and Controls
   In addition to installing a hydraulic pump, you will also need to add the necessary valves and controls for the auxiliary hydraulic circuit. This typically includes a joystick or switch on the operator's panel to control the flow of hydraulic fluid to the attachments.
   • Steps for Valve Installation:
     • Install the auxiliary hydraulic valve in a location that is easily accessible for the operator.
       
     • Connect the valve to the hydraulic lines, ensuring proper routing and no potential for leakage.
       
     • Set up the operator’s controls to operate the valve effectively, ensuring smooth and responsive attachment use.
       

Considerations Before Adding Auxiliary Hydraulics
Before you move forward with adding auxiliary hydraulics to your CAT 236B3, there are a few important considerations to keep in mind:

1. Compatibility with Attachments
   Ensure that the attachments you plan to use are compatible with the hydraulic flow rate and pressure of your machine. Different attachments may have specific requirements in terms of flow and pressure.
   
2. Cost of Retrofit
   Retrofitting the auxiliary hydraulic system can be expensive, especially if you need to upgrade the entire hydraulic system. Consider the costs involved and weigh them against the benefits of increased machine functionality.
   
3. Installation Time and Complexity
   Installing an auxiliary hydraulic system requires time and expertise. While some users may be able to complete the retrofit themselves, others may prefer to hire a professional for the job. Consider the time and effort involved in this modification.
   
4. Machine Warranty
   If your CAT 236B3 is still under warranty, check whether retrofitting or modifying the hydraulic system could void any aspects of the warranty. Consult with a CAT dealer before making any modifications.
   

Conclusion
The lack of an auxiliary hydraulic option on certain CAT 236B3 models can be a limitation for operators who require versatile attachment functionality. However, by retrofitting the machine with an auxiliary hydraulic system or upgrading the hydraulic components, you can easily add this functionality and increase the versatility of your loader. Whether through a hydraulic kit, system upgrade, or valve installation, there are several ways to enable auxiliary hydraulics on the CAT 236B3, allowing you to expand its capabilities and improve your productivity on the job site.