Honda HRB536C Owner's Manual page 51

7. MAINTENANCE
5. Loosen the top [1] and bottom [2] drive clutch cable locknuts with a 10 mm
wrench. Move the adjuster [3] up or down, as required, until the mower
operates as outlined in step 4. Tighten the locknuts.
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[3]
[4]
[5]
E