RETAINER 7R6929 - Caterpillar

Illustration 1 g01162926
Hydraulic schematic for return circuit (1) Right travel motor (2) Left travel motor (3) Right swing motor (4) Left swing motor (5) Line (case drain) (6) Line (case drain) (7) Swing control valve (8) Back pressure valve (9) Main control valve (10) Passage (pump output flow) (12) Passage (pump output flow) (13) Neutral flow control valve (15) Passage (return oil flow from control valve spools) (16) Passage (return oil flow from control valve spools) (17) Makeup line (18) Return line (19) Return line (20) Bypass check valve (21) Back pressure valve (22) Return line (23) Case drain filter (24) Return filter (25) Hydraulic oil cooler (26) Case drain filter (27) Line (case drain) (28) Cooling pump (29) Front pump (30) Rear pump (31) Suction line (32) Hydraulic tank (33) Line (case drain) (47) Swing pump (48) Fan motor (49) Line (output flow from cooling pump) (50) Differential pressure relief valve (51) Differential pressure relief valveReturn Oil Flow
At NO-LOAD condition, the oil delivery from the front pump (29) , rear pump (30) , swing pump (47) , and cooling pump (28) returns to the hydraulic tank in the following manner.
The oil delivery from the front pump and the rear pump flows into passage (10) of main control valve (9) . Oil then flows through neutral flow control valve (13) . The return oil is then separated into the following two oil paths. Part of the return oil flows through return line (18) and (19) to bypass check valve (20) . The remainder of the return oil flows through return line (22) , back pressure valve (21) and oil cooler (25) . The return oil then flows through the return filters (24) into hydraulic tank (32) .
The oil delivery from swing pump (47) flows