The Toro Dingo TX420 is a compact utility loader propelled by cleated rubber treads or tracks. The TX420 features walk-behind operator design with only three hand controls to execute all functions. Driven by a 20-horsepower gasoline engine, it offers maximum ground engagement power with very low ground pressure for use on delicate turf. More than 35 attachments are available for the TX420, including a backhoe, loader bucket, snowthrower and trencher. Toro's recommended maintenance schedule calls for yearly adjustment of rubber track tension. If track wear exceeds acceptable limits, tracks should be replaced instead.
Lower the loader arms to the ground and stop the Dingo TX420's engine. Take out the ignition key.
Jack up the side to be replaced at least three inches off the ground. Support it securely with a jackstand or blocks.
Remove the tension locking bolt and nut from the tensioner at the rear of the track adjustment chamber.
Rotate the tensioning screw clockwise with a 1/2-inch socket and socket wrench to release the tension in the track.
Move the fork tube against the frame by pushing the tension wheel toward the rear of the unit. Loosen the tension screw more if the fork tube does not touch the frame.
Turn the tension wheel in a forward direction, peeling the rubber track off the wheel from the top as the wheel turns. Remove the track from the tension wheel entirely.
Remove the rubber track from the drive sprocket at the rear of the TX420 and then from the road wheels in the center.
Wrap the new track around the drive sprocket, engaging the lugs on the track with the slots between the spacers.
Push the track under the road wheels.
Mount the track on the tension wheel beginning at the bottom of the wheel and rotating the track toward the rear, engaging the lugs on the track with the slots between the spacers on the wheel.
Rotate the tensioning screw counter-clockwise until the gap between the tension nut and the back of the fork tube is 2 3/4 inches.
Line up the nearest notch in the tensioning screw to the locking bolt hole. Install the locking bolt and nut and tighten them to secure the tensioning screw.
Lower the TX420 to the ground and repeat the procedure for the track on the other side.