Honda BF35A-BF45A Outboard Motors Shop Manual., Page 413Get this manual
cASSEMBLY VALVE BODY ASSEMBLY
CAUTION: Do not reuse the O-ringDo not use shop towel, cloth, gloves, etcwhen reassemblya Assemble the parts with care not to let the foreign particles and dirt enter the valve body and gear pump assembly1) Clean the parts in the fresh ATF, and blow each port of the parts with compressed airCheck that the parts are free from contamination with dust and dirt before reassembly