To reduce backlash in a PTO installation, what adjustment can be made?

• A. Install a gasket of different thickness between the transmission and PTO housings
• B. Defective overspeed switch
• C. Replace PTO drive gear
• D. Lubricate more

Answer: (A)

Backlash is the clearance between meshing gears. In a PTO installation, you control that clearance by changing how far apart the transmission and PTO housings sit. Installing a gasket of different thickness between the two housings adjusts their spacing, which changes how deeply the gears engage and reduces the lash. If the mesh is too loose, a thicker gasket can bring the gears closer together; if the mesh is too tight, a thinner gasket is needed, always within the manufacturer’s specified range. The overspeed switch, a worn gear, or simply adding more lubricant don’t adjust the gear engagement in the mesh, so they don’t address backlash.