Gehl Boom Chain Adjustment: A Comprehensive Guide

Boom chains are a crucial component in the lift arms of skid steers, compact track loaders, and other heavy equipment. Adjusting the boom chain properly ensures the lift system operates smoothly and helps to extend the life of the machinery. This guide explores the importance of boom chain adjustment, the common issues associated with it, and how to properly adjust the boom chain on Gehl machines for optimal performance.

Understanding the Function of Boom Chains

The boom chain plays a key role in the lifting and lowering action of the machine’s arms. Located on the lift arms or boom structure, the boom chain is responsible for transmitting power from the hydraulic system to the boom. The chain is tensioned to maintain the correct lifting path and angle, ensuring that the bucket or other attachments stay stable and level during operation.

In Gehl machines, as in other skid steers and compact track loaders, the boom chain allows for controlled and balanced lifting. When these chains become worn or lose proper tension, the machine's lifting performance can be compromised. This may result in uneven lifting, difficulty raising or lowering the boom, or even unsafe conditions for the operator.

Signs of Improper Boom Chain Tension

Over time, the boom chains on a Gehl loader can wear out, stretch, or lose tension. This affects the lift arm function and may lead to a variety of problems:

Uneven Lifting: If the boom chains are too loose, the arms may lift unevenly, causing the attachment to tilt or sway as it is raised or lowered.
Difficulty Lifting Heavy Loads: When the boom chain is not tight enough, it can prevent the machine from efficiently lifting heavy loads, as it compromises the lift arm's ability to maintain the correct angle.
Increased Wear on Hydraulic System: Improperly adjusted chains can cause the hydraulic system to overcompensate, increasing strain on the pump, cylinders, and other hydraulic components, which may lead to premature wear and costly repairs.
Unusual Noises: Chains that are too tight or loose may cause unusual sounds, such as clanking or grinding, which often signal that the boom chain needs adjustment.
Inconsistent Boom Movement: If you notice that the boom doesn't respond as smoothly to control inputs, this could be a sign of chain problems. A lack of smooth movement can make operation difficult and less precise.

When to Adjust the Boom Chain

It is essential to regularly inspect the boom chain, especially if you notice any of the symptoms listed above. A proper adjustment will ensure that the lift arms are functioning as designed and prevent long-term damage to the machine. Some common situations when you may need to adjust the boom chain include:

After Extended Use: If you’ve been operating your loader for an extended period, particularly in challenging conditions, the boom chain may have loosened or stretched. Regular maintenance intervals should include checking the tension.
After Replacing Hydraulic Components: If you’ve had to replace hydraulic components such as cylinders or hoses, this might also affect the boom chain's tension, so an adjustment may be necessary.
Following a Repair: Any time a mechanical issue with the lift system has been addressed, such as replacing worn parts, it’s a good idea to inspect and adjust the boom chain.
Routine Inspections: During regular maintenance checks, it’s wise to verify that the boom chain is properly adjusted, as part of the overall preventive maintenance.

Tools Needed for Boom Chain Adjustment

To adjust the boom chain on a Gehl loader, you’ll need some basic tools. These tools ensure that the process is done correctly and safely:

Wrenches: To loosen or tighten the nuts securing the chain to the lift arm.
Torque Wrench: To ensure that all nuts are tightened to the correct specifications.
Lifting Equipment: You may need a hydraulic jack or jack stands to support the lift arm during adjustments.
Measuring Tape: To measure the correct tension or slack in the chain.
Screwdrivers: In case any fasteners need to be adjusted or removed.
Lubricant: To reduce friction and make sure that the chain moves smoothly after the adjustment is complete.

How to Adjust the Boom Chain on a Gehl Loader

Adjusting the boom chain on your Gehl machine is not overly complicated, but it should be done with care. Below are the general steps for making the necessary adjustments:

Lift the Machine Off the Ground:
To adjust the boom chain safely, lift the loader using its lifting arms. Use jack stands to secure the machine before starting any work. This step ensures you won’t be working under a load, which can be dangerous.
Locate the Boom Chain and Tensioner:
On most Gehl loaders, the boom chain is located on the lift arms and is tensioned with an adjustable mechanism, such as a tension bolt or nut. The exact location of the chain and tensioner may vary based on the model, so refer to the operator's manual for specifics.
Loosen the Tensioning Nut:
Using a wrench, loosen the tensioning nut or bolt that holds the boom chain in place. This will allow you to adjust the chain's tension. Be careful not to remove the nut completely, as you will need it to secure the chain back in place.
Adjust the Chain Tension:
If the chain is too loose, tighten the tensioner to increase the tension. If the chain is too tight, loosen the tensioner slightly to allow for a little more slack. You may need to adjust the chain on both sides to ensure the lift arms stay balanced.
Check the Chain’s Alignment:
As you adjust the tension, ensure that the chain runs smoothly and is aligned properly with the sprockets. Misalignment can cause the chain to wear unevenly or cause additional stress on the components.
Re-tighten the Tensioning Nut:
Once the chain is properly adjusted, re-tighten the tensioning nut. Use a torque wrench to tighten it to the specifications outlined in your operator’s manual.
Test the Boom Operation:
After adjustment, test the boom’s operation by raising and lowering the arms. Ensure that the boom moves smoothly and evenly. The load should stay level, and the machine should be able to lift as expected without any unusual noises or resistance.
Inspect for Further Issues:
Once you’ve completed the adjustment, inspect the boom chain for any signs of damage, wear, or corrosion. If the chain shows signs of significant wear, it may be time to replace it.

Common Issues with Boom Chain Adjustment

Incorrect Tension: If the boom chain is too tight, it may cause strain on the hydraulic system. If it’s too loose, the machine may not lift properly. It’s crucial to get the tension just right for smooth operation.
Uneven Adjustment: If you don’t adjust both sides of the chain evenly, the lift arms may become misaligned, leading to uneven lifting. Always ensure the chain is adjusted symmetrically on both sides.
Damaged Sprockets: The sprockets that the boom chain runs on can also wear down over time. If you notice that the chain skips or doesn’t move smoothly, inspect the sprockets for damage.
Worn Chains: Over time, chains can stretch or wear out. If adjusting the chain doesn’t resolve the issue, it may need to be replaced. A worn-out chain can affect the machine’s lifting ability and safety.

Conclusion

The boom chain on a Gehl loader plays an integral role in the machine’s lifting functionality. Regular inspection and proper adjustment are vital to maintaining the equipment's performance and safety. By ensuring the correct tension and making necessary adjustments, you can keep your Gehl loader operating smoothly and avoid costly repairs or downtime.

If you encounter any issues that go beyond simple adjustments, it’s important to seek professional help or refer to the machine’s service manual for more in-depth troubleshooting. Proper maintenance will ensure that your Gehl loader remains a reliable tool for years to come.