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Service & Maintenance Question

    Geoffrey Healy
    I have a HU775H rear powered mower. I hit a hard object...
    Service & Maintenance Question posted November 8, 2014 by Geoffrey Healy 
    319 Views, 3 Comments
    Question:
    I have a HU775H rear powered mower. I hit a hard object with the mower blade and sheared the pins off on the blade attachment adapter. I have tried to replace the blade adapter with two new units and each time as soon as I start the mower up the pins on the new blade adapter shear off. What gives?

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    Answer

     

    • Eugene Rounds

      Question are these the pins you wrote about?

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      • Geoffrey Healy
        Yes, I have sheared them off on two new blade adapters just by starting the mower.

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    • Eugene Rounds

      First make sure the blade isn't contacting anywhere the deck during it rotation.

      Also please review the following instructions on blade replacement.The first are about the blade adapter which you probably can skip. Making sure the blade is mount on the star correctly and not upside down is very important as is torquing the retaining bolt to spec.

      Below is quoted from the owners manual and may help.

      TO REPLACE BLADE
      1. Position the blade adapter on the engine crank shaft.
      Be sure key in adapter and crankshaft keyway are
      aligned; and that the drive belt is inside the tabs of the
      belt retainer (Figure 20).
      2. Install debris shield using screw.
      3. Position blade on the blade adapter.
      IMPORTANT: TO ENSURE PROPER ASSEMBLY, CENTER
      HOLE IN BLADE MUST ALIGN WITH STAR ON BLADE
      ADAPTER.
      4. Be sure the trailing edge of blade (opposite sharp edge)
      is up toward the engine.
      5. Install the blade bolt with the lock washer and hardened
      washer into blade adapter and crankshaft.
      6. Use block of wood between blade and lawn mower
      housing and tighten the blade bolt, turning clockwise.
      • The recommended tightening torque is 35–40 ft. lbs.
       

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