KIT-FASTENER 3357519 - Caterpillar

Illustration 1 g00661589
Top view of the transmissionLocation of the fan pumpThe vane pump supplies high pressure oil to the fan drive motor. The vane pump is coupled to the implement pump. The vane pump is located on the right rear side of the transmission.
Illustration 2 g00537840
Cartridge assembly for the vane pump (AA) Supply oil. (BB) Pressure oil. (1) Cam ring. (2) Rotor. (3) Outlet. (4) Vane. (5) Inlet. (6) Slot. (7) Passage. (8) Inlet. (9) Insert. (10) Outlet. (A-F) Different positions of the vanes.The following components are in the cartridges. inlet support plates, outlet support plates, seal packs, flex plates, cam ring (1), rotor (2), vanes (4) and inserts (9) .Note: For additional information on vane pumps, refer to Special Instructions, SMHS7047.Grooves in the flex plates allow pressure oil to flow to slots (6) in rotor (2). Oil from the slots then flows into the area between inserts (9) and vanes (4). The vanes are pushed out against cam ring (1) .As rotor (2) turns, the vanes in positions (E) and (F) move out. The vanes then follow the shape of the cam ring. As the chamber area between the vanes increases, a low pressure or a low vacuum is created in the chamber. This pressure difference causes oil to flow from the hydraulic tank through inlet (8). The oil fills the space between vanes at positions (E) and (D). The oil continues to fill the space through positions (D) and (A) .Oil between the vanes at positions (D) and (A) will be trapped when the vane at position (D) passes the end of inlet (8). As rotor (2) continues to turn, the vanes are pushed in by the contour of cam ring (1). The chamber area between the vanes now decreases. Oil between the vanes at positions (A) and (B) is pushed into outlet (3). The oil continues to be pushed out through positions (B) and (C). When the vane at position (B) passes the end of outlet (3), the cycle is completed.Both ends of the vanes are connected by passages (7) in the rotor. The oil in these passages will keep the pressure even on both ends of the vanes. This oil also permits the oil behind the vanes to escape as the vanes are pushed in.