Download Case 621F, 721F Service Manual –

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Wheel balancing is essential for ensuring optimal performance and longevity of the tires on equipment like the Case 621F and 721F wheel loaders. click here for more details on the download manual…..


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Here’s a detailed guide on how to perform wheel balancing on these machines:

– **Gather Necessary tools and Equipment:**
– **Jack or Forklift:** Use a hydraulic jack or forklift to lift the loader safely. Ensure it has the capacity to lift the weight of the wheel loader.
– **Wheel Balancer:** A portable or stationary wheel balancer designed for heavy machinery. This device spins the wheel to identify heavy spots.
– **Weights:** Use the appropriate wheel weights, which can be clip-on weights or adhesive weights, depending on the wheel design.
– **Torque Wrench:** Essential for properly tightening lug nuts to the manufacturer’s specified torque.
– **Tire Pressure Gauge:** To check that the tire pressure is within the recommended range.
– **Safety Equipment:** Wear safety glasses and gloves for protection during the process.

– **Prepare the Work Area:**
– Ensure you are working in a flat, stable area to prevent any accidents while lifting the loader.
– Clear the area of any obstructions to allow easy access to the loader’s wheels.

– **Secure the Loader:**
– Engage the parking brake and turn off the engine to prevent any movement.
– If using a jack, position it under the designated lifting points of the loader and carefully lift the wheel off the ground. If using a forklift, ensure it’s positioned safely and lift the loader as needed.

– **Remove the Wheel:**
– Using a breaker bar or impact wrench, loosen the lug nuts of the wheel.
– Remove the lug nuts completely and take off the wheel carefully, ensuring you do not damage any components.

– **Check Tire Pressure:**
– Before balancing, use a tire pressure gauge to check the tire pressure. Inflate or deflate the tire as needed to reach the recommended pressure specified in the owner’s manual.

– **Inspect the Wheel and Tire:**
– Check for any visible damage to the tire or wheel, such as cracks, bulges, or foreign objects embedded in the tire.
– Clean the rim and tire bead area to ensure that no dirt or debris interferes with the balancing process.

– **Mounting the Wheel on the Balancer:**
– Place the wheel on the wheel balancer according to the manufacturer’s guidance.
– Ensure that it is securely fitted and that the balancer is calibrated for heavy machinery tires.

– **Balancing Process:**
– Start the wheel balancer. The machine will spin the wheel and identify any heavy spots.
– The balancer will indicate where to place weights to achieve an even balance. Note the locations and amounts of weight required.

– **Applying Weights:**
– Attach the specified weights to the rim at the indicated points. Use clip-on weights for steel rims or adhesive weights for aluminum rims.
– Ensure that the weights are securely attached and that they do not interfere with the tire bead.

– **Rechecking Balance:**
– Spin the wheel again on the balancer to confirm that it is now properly balanced. Adjust the weights if necessary until the wheel is balanced.

– **Reinstalling the Wheel:**
– Carefully lift the wheel back to the loaderdownload Case 621F 721F workshop manual and align it with the hub.
– Hand-tighten the lug nuts to hold the wheel in place, then use a torque wrench to tighten them to the manufacturer’s specifications in a crisscross pattern to ensure even pressure.

– **Lowering the Loader:**
– Remove the jack or forklift once the wheel is securely fastened.
– Ensure that the loader is safely on the ground before removing any tools.

– **Final Checks:**
– After balancing and reinstalling the wheel, check the tire pressure again.
– Conduct a brief test drive in a safe area to ensure that the loader operates smoothly and that the wheel is balanced.

– **Documentation:**
– Keep a record of the balancing procedure, including any weights added or adjustments made, for future reference and maintenance tracking.

By following these detailed steps, you can effectively balance the wheels on a Case 621F or 721F loader, promoting better performance and extending the life of the tires.
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