What is typically checked by a mechanic when inspecting a transmission pump?

When inspecting a transmission pump, one of the key aspects a mechanic checks is the pump body to gear face clearance. This is critical because maintaining the correct clearance ensures that the pump operates efficiently and effectively, providing the proper hydraulic pressure needed for transmission function. If this clearance is too tight, it can lead to excessive friction and wear, while too much clearance may result in inadequate fluid pressure and potential slippage.

The pump body houses the gears and is integral to creating the necessary hydraulic force to drive the transmission. Therefore, ensuring that the clearance between the pump body and the gear face is within manufacturer specifications is vital for optimal performance and longevity of the transmission.

While other aspects like the pump driven gear tip clearance, pump body to case seal, and gear contact pattern are also important in the overall health and efficacy of a transmission system, the pump body to gear face clearance specifically relates to the function of the pump itself in creating the hydraulic necessary for fluid movement and pressure.