Walker MDD (20.9 HP) Owner's Manual

Also see for MDD: Owner's manual Owner's manual

Contents

Maintenance Instructions REPLACING/REPAIRING74Reinstall the blades following procedure fromSharpen Mower Blades instructions in CHECKING/SERVICING in this section. If blades are replaced,always use Walker original equipment blades toensure safety and optimum performance. Thequality and performance of replacement bladesoffered by other manufacturers cannot beguaranteed, they could be dangerous.Mower Deck Gearbox ReplacementNOTE: Deck gearbox(es) may be changed withthe deck mounted on the tractor. However, the deckmay be removed from the tractor making the overalljob of removing the gearbox assembly easier. Referto Deck Installation in Assembly Instructions and re-verse the procedure to remove the deck.To replace the mower deck gearbox(es), use the fol-lowing procedure:1. Remove mower blades. Refer to procedure inCHECKING/SERVICING the Sharpen MowerBlade in this section for instructions.2. Remove gearbox cover (two machine screws)and PTO shaft guard (two 1/4-20 bolts).3. Remove two (2) 3/8-16 mounting bolts fromeach blade drive gearbox and lift the entiregearbox assembly from the deck (includingPTO drive shaft).4. Remove the screws securing the cover plateson the gearboxes and remove the covers. Re-move all covers to be sure oil is completelydrained from all gearboxes.NOTE: With oil flow throughout the unitizedgear drive assembly; if one gearbox has internaldamage or excessive wear, the remaining gear-boxes and connector tubes should be complete-ly disassembled and thoroughly flushed out withsolvent before reassembly.5. Drain and properly dispose of oil.6. Remove the four (4) bolts mounting the gearboxto the connector tube and slide the gearbox offthe splined drive shaft coupling.7. Install the new gearbox on the spline coupling ofthe drive shaft. Establish correct timing of theblade drive gearboxes by setting flats on theoutput shaft at 90 degrees when connecting thegearbox(es) to the spline coupling. Make surethe timing is correct before proceeding with as-sembly.8. Reinstall the four (4) bolts mounting the gear-box to the connector tube but do not tightenthem at this time; leave connector tube bolts fin-ger-tight.9. Position the gear drive assembly on the deckand install the 3/8-16 bolts mounting the entireassembly. Leave the mount bolts finger-tight.10. Torque all the connector tube bolts to 80 in-lb(9 N·m); then tighten the deck mount bolts.NOTE: This fastener tightening sequencealigns the gearbox assembly with the deck hous-ing and eliminates the possibility of mounting theunitized assembly in a bind.11. Fill gearbox assembly with oil. Refer toLUBRICATION for Mower Deck GearboxLubrication in this section for instructions.12. Reassemble remaining items onto deck to com-plete installation. After installing blades, checkthat the blade timing is correct by moving theblades through one (1) complete revolution.Make sure blade tips pass clear of each other.Mower Deck Gearboxes(Shown with Gearbox Cover Removed for Clarity)CAUTIONALWAYS use genuine factory replacementparts. Substitute parts CAN result in prod-uct malfunction and possible injury to theoperator.Mower DeckGearboxesConnector Tubes