2001-2003 Honda TRX500FA Factory Service Manual, Page 395Get this manual
TECHNICAL FEATURES AUTOMATIC TRANSMISSION UNIT CONSTRUCTION AND OPERATION OPERATING PRINCIPLES
This automa tic transmission unit is wi th fixed-volume pi ston pum and variab le-vo lume piston otor in po sit io on the same shaft (pumpm otor shaft)As the autom at ic transmission is cl osed ci rcu it, any excess hydrau lic flu id from he aut om at ic ransmis sion system is recircul ated to th tran smi ssion using separate cha rg pump (ieoil pum fo lubricat ion ).T he autom afic tra nsm issio uses standard engi ne oil or lubrication as hydraulic fluidUpon engagement by he cent rifugal clutch, the eng ine turns the ransm issio n's ump-side outer body lcall ed pump swash plate assembly ), causing the fixed -angle pump-side sw ash plate within to rotate, sequent ially st rok ing he pump side pistonsThis act ion draws low-pressure lu id int the isto nswh ich ischarge high-pressure flu id (co rrespo nd ing to the input orque)The flu id is istributed to the high-p ressure ci rcuit by the istributor valv on he pump side.The istribut or alv on the otor side ope ns and feeds the igh-pressu re fluid to he piston on he otor side for he suction strokeEach dist ribut or valve is eccent ricall synchronized the rotat ion of its respect ive swas plate ens ri ng tha lui is tran sferred at the proper im (see next page)ENG INE POWER (f ro cen rifugal cl utchCirculation of hyd aul ic fluid in the automatic rans ission