What issue is typically associated with hydraulic motors that are not producing full torque?

In the context of hydraulic motors not producing full torque, the primary concern is often centered around hydraulic system performance and efficiency. When a hydraulic motor fails to reach its full torque capabilities, one of the common culprits is the relief valve being set too low.

If the relief valve's setting is insufficient for the demands of the system, it will prematurely redirect or relieve pressure from the hydraulic circuit, causing the motor to operate under lower hydraulic pressure than required for optimal performance. Consequently, this reduced pressure directly impacts the torque output, as hydraulic motors rely on adequate pressure levels to generate higher torque.

Considering the other issues mentioned: internal leakage can lead to reduced efficiency of the motor, and shaft seal leaks can result in a loss of fluid, both of which can also hinder performance but are not the primary cause for not achieving full torque. A low relief valve setting is a more critical and direct cause in this specific scenario where torque output is compromised.