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Proper chain tensioning on a CAT 242 skid steer loader is essential for drivetrain longevity and smooth operation. The adjustment process involves repositioning the axle hubs within slotted mounts to achieve the correct chain deflection, with attention to torque specifications and lubrication.
CAT 242 Skid Steer Overview
The CAT 242 is a mid-frame skid steer loader developed by Caterpillar Inc., a global leader in construction machinery since 1925. Designed for compact job sites, the 242 features a vertical lift path, hydraulic quick coupler, and chain-driven final drives. The machine is widely used in landscaping, light construction, and agricultural support, with thousands of units sold across North America and Europe.
The drivetrain consists of a central hydrostatic motor driving chains that transfer torque to the front and rear wheels on each side. These chains are housed in sealed compartments filled with oil and require periodic inspection and adjustment to maintain proper tension.
Terminology Note
In Tennessee, an owner-operator noticed chain slap and found over 2 inches of deflection in the rear-right chain. After removing the side cover and wheels, he used a 4x4 and wedges to spread the axles. The adjustment restored smooth operation and eliminated the noise. He noted that RTV sealant held the cover so tightly it required careful prying to avoid damage.
In New York, a technician used a factory-style turnbuckle spreader to adjust both sides of a CAT 242. He emphasized the importance of rechecking torque after the initial tightening, as the axle can shift slightly under load.
Conclusion
Chain adjustment on the CAT 242 skid steer is a critical maintenance task that ensures drivetrain efficiency and prevents premature wear. With the right tools, accurate deflection measurements, and adherence to torque specs, operators can perform this service confidently. Whether using a factory spreader or a homemade wedge system, the key is even pressure, proper lubrication, and consistent inspection intervals.
CAT 242 Skid Steer Overview
The CAT 242 is a mid-frame skid steer loader developed by Caterpillar Inc., a global leader in construction machinery since 1925. Designed for compact job sites, the 242 features a vertical lift path, hydraulic quick coupler, and chain-driven final drives. The machine is widely used in landscaping, light construction, and agricultural support, with thousands of units sold across North America and Europe.
The drivetrain consists of a central hydrostatic motor driving chains that transfer torque to the front and rear wheels on each side. These chains are housed in sealed compartments filled with oil and require periodic inspection and adjustment to maintain proper tension.
Terminology Note
- Chain Box: The enclosed compartment housing the drive chains and axle hubs.
- Axle Spindle: The shaft and hub assembly that supports the wheel and allows for chain tension adjustment.
- Deflection: The vertical movement of the upper chain when the lower chain is taut.
- Turnbuckle Spreader: A tool used to push axle housings apart during adjustment.
- RTV Sealant: A silicone-based gasket maker used to reseal chain box covers.
- Access the Chain Box
Remove the side cover panels and wheels for better access. The chain box is sealed with RTV and secured with bolts. Carefully pry off the cover without damaging the mating surfaces.
- Check Chain Deflection
With the lower chain pulled taut, measure the vertical deflection of the upper chain. If it exceeds 1.6 inches, adjustment is required. The target deflection is 0.6 inches.
- Loosen Axle Spindle Bolts
The axle hubs are mounted in slotted holes. Loosen the spindle bolts evenly in a crisscross pattern, similar to lug nuts on a truck wheel.
- Spread the Axles
Use a turnbuckle-style spreader or a 4x4 wood block with wedges to push the axles apart. This increases chain tension. Some technicians use a ratchet binder with fabricated ends to apply outward force.
- Retighten and Torque
Once the desired tension is achieved, torque the spindle bolts to 37 ft-lbs in a crisscross pattern. Repeat the torque sequence and then apply an additional 90 degrees of rotation to each bolt.
- Recheck Deflection
Confirm that the upper chain deflection is within the 0.6-inch specification. Adjust again if necessary.
- Lubrication and Reassembly
Fill the chain box with 1.6 gallons of motor oil. Viscosity should match ambient temperature—typically SAE 15W-40 or 20W-50. Reseal the cover with RTV and reinstall all components.
- Inspect chain tension every 500 hours or if chain slap is heard during operation.
- Use a flashlight to inspect chain wear and oil condition during cover removal.
- Replace chain box oil annually or if contamination is observed.
- Keep a log of adjustments and oil changes for each side.
In Tennessee, an owner-operator noticed chain slap and found over 2 inches of deflection in the rear-right chain. After removing the side cover and wheels, he used a 4x4 and wedges to spread the axles. The adjustment restored smooth operation and eliminated the noise. He noted that RTV sealant held the cover so tightly it required careful prying to avoid damage.
In New York, a technician used a factory-style turnbuckle spreader to adjust both sides of a CAT 242. He emphasized the importance of rechecking torque after the initial tightening, as the axle can shift slightly under load.
Conclusion
Chain adjustment on the CAT 242 skid steer is a critical maintenance task that ensures drivetrain efficiency and prevents premature wear. With the right tools, accurate deflection measurements, and adherence to torque specs, operators can perform this service confidently. Whether using a factory spreader or a homemade wedge system, the key is even pressure, proper lubrication, and consistent inspection intervals.
