Owners of LS tractors with LB1100 series backhoes, such as the LB1104 or LB1106, might experience failures of the detent cap, located on the backhoe’s hydraulic valve. These failures often cause huge hydraulic oil leaks, leading to downtime and frustration. Previously thought to be operator errors, these issues are now recognized as design flaws.

Unlike the LB1100 series, the MT1 subcompact tractors from LS do not encounter this problem, as they come equipped with a factory-installed hydraulic return line.

What’s Going Wrong?

The primary issue involves the detent cap of the hydraulic system on LB1100 series backhoes. This cap fails due to pressure buildup, exacerbated by a faulty o-ring in the valve body intended to seal the valve spool. Without a sufficient pressure relief mechanism, the hydraulic system’s regular stress leads to repeated failures.

Temporary Fixes

If a detent cap failure occurs, a quick fix involves replacing the broken cap and o-rings, which temporarily gets the tractor back up but does not resolve the underlying issue. Commonly used parts include:

XANE228061 Ring
XCAP210725 Cap

You can usually get these components from Walvoil dealers and us.

Permanent Solutions

For a long-term solution, you’ll need to choose from one of two options:

1. Remote Valve Kit: Adds a dedicated valve for the backhoe. Can also be used for other things like a hydraulic top link.
2. Dedicated Return Line Kit (XJ2025 models only): Adds a direct return line, preventing pressure spikes that cause the detent cap failure.

DIY Installation Tips

If opting for a self-installation:

Confirm the have correct kit for your model.
The installation instructions for either kit leave a lot to be desired. If you haven’t done a project like this before it’s best to have your dealer do the install.
The installation itself isn’t difficult, either kit can be installed with simple hand tools.
Depending on how the backhoe was installed you might have to source new hydraulic hoses or fittings.
After installation, inspect for leaks and double check everything works correctly.

Finding the Right Parts

Locating the correct parts can be challenging. The repair kit from LS is horribly expensive and usually out of stock. However many dealers including us stock the correct OEM Walvoil valve parts.

Dealing with hydraulic valve cap failures is a real pain but it doesn’t have to be. By proactively installing either a dedicated return line or remote valve kit you can correct this issue once and for all. At Ag-Bag Forage Solutions, we are committed to providing the necessary parts to keep your LS Tractor going for the long haul. Contact us if we can help with replacement parts, filters or other service items.

Disclaimer

Always consult your factory service manual for specific installation instructions and safety guidelines before attempting any repairs or modifications to your tractor. Running with scissors is never a good idea, and similarly, taking shortcuts or ignoring proper procedures when working on heavy machinery can lead to accidents. If you decide to undertake repairs or installations yourself, please be aware that doing so is at your own risk. Ag-Bag Forage Solutions is not liable for any damage or injuries that may result from improper handling or installation of parts and kits. Safety first—ensure you are fully informed and equipped to handle the tasks you undertake.