Toro 20351 Quality Guide - Page 39

Checking and Adjusting the Blade Level Adjusting Front-to-Rear Pitch The mower blade should be between 1/16- 5/16 inch (1.6-7.9mm) lower in front than in the rear. If adjustment is necessary, proceed as follows: 1. To adjust the front-to-rear blade pitch, remove the hairpin cotter from the front trunnion yokes and loosen the jam nuts (Figure 73). the same distance from the blade to the ground (Figure 74). 1. Measure here Figure 74 trclevel.TIF An alternate way to check this is to remove the mower housing and turn it over. Remove the blades and lay a straight edge on two blade saddles (Figure 75). It should lie flat. If not, either the spindle or the housing where the spindle mounts may be bent. 1. Front trunnion 2. Hairpin cotter Figure 73 3. Jam nut Z_F2R.TIF 2. Rotate the yokes on the rods to change the adjustment. To raise the front of the mower, tighten the yokes (shorten the rods). To lower the front of the mower, loosen the yokes (lengthen the rods). 3. After adjusting both trunnion rod yokes evenly, secure the yokes with the hairpin cotters. Check the front-to-rear pitch again. Continue adjusting the yokes until the front blade tip is within specification. 4. When the front-to-rear blade pitch is correct, tighten the jam nuts. 5. Recheck the side-to-side leveling and correct if necessary. 6. If the mower required substantial changes, check the anti-scalp rollers and re adjust if necessary. Adjusting Blade Tracking On mowers with multiple blades, not only do the blades need to be a minimum of 1/8 inch up from the bottom edge of the housing, but they must also line up where the tips come together. Take the two blade tips and point them towards each other. They must be within 1/8-3/16 inch of level with each other, or both must be Figure 75 altbltrk.TIF Yet another way to check this with the blades attached is to align the blades (two blades at a time on three blade mowers), then run a string across the cutting tips of the blades. The string should be straight. If it is not, the blade or spindle could be bent. If the saddles or blades do not line up and the spindles are not bent, a shim between the spindle housing and the mower housing may help align them. Loosen the spindle to mower housing bolts and insert shim washers until the saddles are in line. Then if you used washers to shim the spindle housing, remove the bolt and reassemble through the washer to secure it. Service Dealer's Guide to Great Quality of Cut 4 - 23