The aim of this study is to analyse two sliding contacts in a radial piston hydraulic motor and study their influence on the leakage and power losses. By the use of commercially available FEM software package the losses in the two contacts, the distributor valve and the piston cam-roller contact, are estimated by simulation and related to experimentally measured losses of the motor under different operating conditions. The estimated losses from the two contacts can not explain the total losses and seems also to be a smaller part of the total losses. As long as full film lubrication is present the power losses from the two studied contacts appears to be relatively small. The hydrostatic balancing effect contributes mostly to the external leakage in the piston cam-roller contact. Measured leakage dependency of speed can be related to the piston cam-roller contacts in the motor. At low speed and high load the piston cam-roller contact might enter mix lubrication regime.