WASHER 3802680 - Caterpillar

Construction
Illustration 1 g00700449
Main pumps (1) Port (negative flow control pressure) (2) Outlet port (pilot pump) (3) Idler pump (4) Outlet port (idler pump) (5) Inlet port (6) Port (power shift pressure) (7) Port (negative flow control pressure) (8) Drive pump (9) Outlet port (drive pump) (10) Housing (11) Pilot pump The main pumps consist of idler pump (3) and drive pump (8). The main pumps and the port block are bolted together in order to form one assembly. The idler pump and the drive pump are identical in construction and identical in operation. The pumps have identical control systems. Oil from the hydraulic tank flows into inlet port (5) of the port block. Idler pump (3) delivers oil through outlet port (4). Drive pump (8) delivers oil through outlet port (9). Pilot pump (11) draws oil through inlet port (5). Pilot pump (11) delivers oil through outlet port (2) .The power shift pressure is determined by the electronic controller. The power shift pressure flows into the main pumps through port (6). The negative flow control (NFC) pressure from the main control valve flows into idler pump (3) through port (1). The NFC pressure from the main control valve flows into drive pump (8) through port (7).
Illustration 2 g00814544
Main pumps (sectional views) (4) Outlet port (idler pump) (5) Inlet port (9) Outlet port (drive pump) (10) Housing (11) Pilot pump (12) Gear (pilot pump) (13) Plate (14) Pin (17) Regulator (18) Drive shaft (drive pump) (19) Center line (20) Trunnion (21) Housing (22) Center line (23) Gear (drive pump) (24) Piston (25) Cylinder (26) Valve plate (27) Piston (28) Gear (idler pump) (29) Shaft (idler pump) (30) Cylinder passage (31) Inlet passage (32) Inlet passage (33) Center hole (34) Outlet passage (35) Outlet passage (C) Radial direction (D) Radial directionIdler pump (3) and drive pump (8) are bent axial piston type pumps. The term "bent axial" describes the angular movement of the piston pump assembly. This movement is around the point of intersection of center lines (19) and (22). The output of the pumps changes depending on the angle of cylinder (25) .Drive shaft (18) of the drive pump is coupled with the engine flywheel. Gear (23) of drive shaft (18) engages with gear (28) of shaft (29). When shaft (18) is driven by the engine flywheel, shaft (29) is driven through a mechanical linkage between gear (23) and gear (28). Gear (23) has the same number of teeth as gear (28). Therefore, both pumps rotate at the same speed as the engine.Because gear (23) engages with gear (12) of the pilot pump, pilot pump (11) rotates with the main pumps.Main Pump Operation
The idler pump (3) and drive pump (8) are identical in operation. The drive pump is described below.Drive shaft (18) is driven by the engine. Drive shaft (18) turns seven pistons (24). Therefore, angle cylinder (25) rotates. Angle cylinder (25) is in contact with valve plate (26). Angle cylinder (25) rotates on valve plate (26). Angle cylinder (25) pivots