User manual TORO LAWN BOY

[. . . ] WALK BEHIND POWER MOWER DRIVE SYSTEMS SERVICE MANUAL ABOUT THIS MANUAL This service manual was written expressly for Toro servicing dealers. The Toro Company has made every effort to make the information in this manual complete and correct. This manual was written with the assumption that the reader has basic mechanical knowledge and skills. This book contains material covering the Toro and Lawn-Boy Walk Behind Mower Drive Systems models from 1990 through 2006, and may be specified for use on products built after 2006 that are similar in design. [. . . ] For information on removing the transmission from the unit, see Transmission ­ Removal, page 2-3, 4-5 or 4-6 depending on mower type. Remove the shoulder bolt securing the wheel and tire assembly to the pivot arm and remove the wheel and tire assembly complete with shoulder bolt, spacers, wheel cover, and nylon locknut. 5-4 WPM Drive Systems Manual WHEEL PINION CLUTCH 2. Remove the special retaining clip at the end of the output shaft and pull off the following six wheel pinion clutch components: · Spring · Internally tabbed thrust washer · Wheel pinion · Wheel pinion key · Clutch washer · Friction ring 3. Remove the inner special retaining clip from the output shaft and remove the following components: · Internally tabbed thrust washer · Externally tabbed thrust washer · Pivot arm and spring arm assembly · End cap (if desired) 4. Check all components at this time for damage and wear. Pay particular attention to the grooves at the end of the output shaft, the bearing surfaces on the output shaft, and the wheel pinion clutch components. Check the innermost groove on the output shaft which is located 2-1/4" (5. 7cm) in from the end of the shaft; make sure that the O-ring seal is present and intact. This seal is important to keep grease in and contaminants out. Press the needle bearing and the oil impregnated bushing from the pivot arm using an arbor press. Removal of the grease fitting is not recommended because it is pressed in. However, if damaged or lost, we suggest tapping and installing a threaded grease fitting. If the spring arm knob requires replacement, push in on the detent tab, then pull the knob straight off. Note: The detent rivet is not replaceable. Rear Height-of-Cut and Wheel Pinion Clutch - Assembly 1. Pack the caged needle bearing with grease, then press into the outside of the pivot arm until it is flush with the groove that houses the externally tabbed thrust washer. Press the oil impregnated bushing into the boss on the pivot arm until it is flush with the face of the boss. If spring arm disassembly was required, install the knob making sure that the detent is pressed out about . 060" (1. 5mm). Install the spring arm knob so that the concave side of the knob and the convex side of the rivet align. Fig 137 gearcase wheel assy 2 WPM Drive Systems Manual 5-5 WHEEL PINION CLUTCH 4. Assemble the spring arm and pivot arm as shown in Figure 138. Slide the externally tabbed thrust washer and the internally tabbed thrust washer onto the output shaft. Make sure that the tab on the internally tabbed thrust washer enters the keyway. Make sure that the center tab fits properly into the keyway. This will prevent rotation of the clip on the output shaft. [. . . ] Slip the belt off the crankshaft pulley. In some cases there might not be enough clearance between the blade and mower housing. It might be necessary to remove the blade to slip the belt off. Reverse the process to assemble. 21" Steel and Cast Deck Toro and Lawn-Boy Mowers Belt Replacement Drain the gasoline and oil before tipping the mower to avoid fuel spillage. [. . . ]