Dayton PPO9ZN021G Bushing, Carbon Graphite, PK6

Carbon graphite bushing pack

Dayton PPO9ZN021G bushings come in a package of six carbon graphite pieces built for rotary gear pumps. They are intended for maintenance technicians and plant engineers who need direct replacements for worn pump bushings. The material resists wear and handles the fluid temperatures typical of industrial gear pump service. Buyers who need a different material or a non-standard bore should look elsewhere.

Thermal and power behaviour

Carbon graphite runs self-lubricating so the bushings add minimal friction to the pump shaft. Normal operation stays within the pump’s original thermal envelope and does not increase motor current draw. Noise levels remain unchanged from the factory specification because the bushings match the OEM clearance. Installers who expect a measurable efficiency gain will not see one.

Replaces Grainger 4KHN5 4KHN6 4KHN9 4KHP3

These bushings replace Grainger part numbers 4KHN5 4KHN6 4KHN9 4KHP3 in compatible Dayton rotary gear pumps. The jump is worth it when the original bushings show scoring or excessive clearance that causes pressure drop. Shops that run pumps on abrasive fluids or at the upper end of the duty cycle will see longer intervals between overhauls. Teams that only need a single bushing or a different shaft size should order the exact part instead.