Toro Greensmaster Flex 21 Service Manual

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Greensmaster Flex 21Traction and Reel Drive System (Rev. C) Page 4 ñ 34Differential Assembly1. RH (short) axle2. LH (long) axle3. Retaining ring4. Differential bevel gear set5. Drive pin6. Washer7. Thrust washer8. Roll pin9. Input gear/housingFigure 501 8643425476FRONTRIGHT9The differential assembly is an integral component ofthe gearbox assembly. Service of the differential assem-bly requires removal and disassembly of the gearbox.Disassembly (Fig. 50)1. Remove gearbox from mower (see Gearbox Remov-al) and disassemble gearbox (see Gearbox Disassem-bly) to remove differential assembly.2. Support differential assembly and drive out roll pinthat locates drive pin. Discard roll pin.3. Remove drive pin, two thrust washers, and two bevelgears.4. Remove both retaining rings from each axle. Discardretaining rings.5. Pull each axle free from gear, thrust washer, and dif-ferential input gear housing. Note that axle thrust wash-ers are different from thrust washers used on drive pin.Inspection (Fig. 50)1. Clean all differential components.2. Inspect all differential gears carefully looking forchipped teeth, wear, or other damage. Because geartooth damage is rarely isolated to one gear, the four bev-el gears are only available as a complete set.3. Scoring or wear on axle shafts or drive pin requirecomponent replacement.4. Damage to the input gear/housing requires the re-placement of the entire differential assembly. Inspectgear teeth, axle bearing areas, and drive pin bores.Assembly1. Insert RH (short) axle into input gear/housing on thegear side. Install thrust washer, gear and two new retain-ing rings on short axle. Install LH (long) axle into remain-ing side of input gear housing using the sameprocedure.2. Through the open sides of the input gear housing,align remaining two bevel gears and rotate axle to movethem into their correct position.3. Place a thrust washer between input gear/housingand each bevel gear. Install drive pin with grooved endlocated at roll pin hole.4. Check gear and shaft alignment by rotating one axle.The other axle should turn in the opposite direction with-out any binding. Once free axle movement is checked,install new roll pin to secure drive pin.5. Install differential assembly in gearbox and re-assemble gearbox (see Gearbox Assembly). Installgearbox to mower (see Gearbox Installation).