... the 32 5D MH and 33 0D MH did not change .- The nomenclature for the 32 5D FM and 33 0D FM did not change .- The 32 5D HD HW did not change into 32 9D HD HW. This model is being discontinued.However, ... discontinued.However, the 33 0D HD HW changed to the 33 6D HD HW.SERV185 2-0 2 - 5 - Text Reference10/01 Demand Fan SystemsINTRODUCTIONThere are two types of demand systems used on the 32 0D- 33 6D Hydraulic Excavator ... hydraulic demandfan system .- Visconic demand fan system (32 0D, 32 1D, 32 3D, 32 4D, 32 5D, 32 8D and 32 9D) : Thevisconic demand fan system uses a viscous coupling between the engine mounted, beltdriven...