Toro 20351 Quality Guide - Page 22

Checking and Adjusting the Blade Level Reinstall the pivot and wheel. When you reinstall the wheel, use the extra clearance to raise it to the position of the other front wheel. After reinstalling the wheel and pivot, verify that the blade is level side-to-side. Figure 22 2001-065.TIF Wheel Does Not Touch Ground If one of the wheels does not touch the ground on a level surface, verify that all four spring arms are in the same notch and that those notches are not worn. Make any necessary adjustments (for correcting worn notches, see "Slipping Height of Cut Adjuster" on page 4-5). If the spring arms are in the same notch and the notches are not worn, and the wheel that does not touch the ground is 1/8 inch (3.1mm) or less above the ground, you can correct the problem by lowering one of the front wheels. Remove the front wheel that is on the ground and its pivot arm. Use a round file to elongate the pivot bolt holes upward (Figure 23). Adjusting Side-to-Side Level If the blade is not level within 1/8 inch (3.1mm) side to side, the engine will need to be shimmed. Loosen the engine mounting screws on the low side of the blade. Slip a washer or other shim material between the engine and housing (Figure 24). On a 21-inch mower, use a shim about half as thick as the distance to be shimmed. For instance, if the blade is off 1/8 inch (3.1mm), use a 1/16 inch (1.5mm) shim. Re-measure the blade. If the blade is within 1/8 inch of being level from side to side, remove the engine mounting screw and reinstall it through the housing, shim, and engine. ! Caution ! The aluminum alloy on cast decks files away quickly. Be careful not to elongate the pivot bolt hole excessively. Figure 24 MVC-720X.JPG Adjusting Front-to-Rear Pitch Correction of front-to-rear pitch on a walk behind mower is rarely necessary. If the blade pitch is significantly out of specification, it is best to replace the mower housing. 4 - 6 Figure 23 MVC-718X.JPG Service Dealer's Guide to Great Quality of Cut