2005 Yamaha F90TR 90HP Outboards Factory Service Manual, Page 183Get this manual
Bracket unit
Disassembling the gear pump
1Remove the manual valve, then the gear pump and filters
S6C17600
Checking the gear pump
S6D87370
2Remove the relief valve seat caps, then the up-relief valve seat and downrelief valve seat 23Remove the lever 3, then the shuttle pistons 4