MOTOR GP-SWING 2344535 - Caterpillar

Schematic
Illustration 1 g03136737
System for the oil return
(1) Left travel motor
(2) Right Travel Motor
(3) Swivel
(4) Travel motor drain line
(5) Swing motor
(6) Swing motor drain line
(7) Slow return check valve
(8) Breather cap
(9) Hydraulic oil filter
(10) Hydraulic tank
(11) Drain line
(12) Left joystick
(13) Line
(14) Changeover valve (Boom swing / Auxiliary hydraulics)
(15) Travel pedals
(16) Line
(17) Line
(18) Right joystick
(19) Pilot oil distribution block
(20) Line (Supply)
(21) Line
(22) Return passage
(23) Line
(24) Main control valve
(25) Line
(26) Main pump
(27) Secondary pump
(28) Pilot pump
(29) Pilot operated check valve
(30) Oil cooler The main pump (26), secondary pump (27), and the pilot pump (28) draw oil from the hydraulic tank (10) through line (20). The oil delivery from the pumps will enter the main control valve (24) and is used for machine operations. Once machine functions have been performed, the components must send return oil back to the hydraulic tank (10). The return oil flows out of the main control valve through return passage (22). Line (6) and line (21). These lines direct oil into the slow return check valve (7). Reference: For more information on the operation of the slow return check valve, refer to Systems Operation, "Return Hydraulic System - Slow Return Check Valve" Pilot operated check valve (29) returns oil to the pilot oil distribution block (19) though line (23)The return oil flow from line (11) flows directly to the oil cooler (20). This return oil must pass through oil cooler (20) before flowing through return filter (9).Drain lines from components of the machine allow low volumes of oil to flow into the pilot distribution block (19). The pilot oil distribution block sends return oil through line (25) and into the hydraulic tank (10). Drain oil from travel motors (1) and (2) flow through the swivel (3) and into line (4). This oil flows into the pilot distribution block (19). Drain oil from swing motor (5) flows through line (6) to the slow return check valve (7). Drain oil from pilot control valves (12), (15), and (18) flows to the pilot distribution block (19) and then into the hydraulic tank (10). Drain line (25) is not filtered before returning to the tank.Components
Breather cap
Illustration 2 g03136736
Breather cap
(8) Breather cap
(31) Filter screen
(32) Check valve
(33) Check valve
(34) Spring
(35) O-ring Breather (8) prevents hydraulic tank (10) from becoming pressurized. Atmospheric pressure will equalize inside hydraulic tank (10) through breather (8). Breather (8) also prevents contaminants from entering the tank (10) by using a filter screen (31).When the hydraulic fluid empties from the hydraulic tank (10), a vacuum condition occurs inside the hydraulic tank. Check valve (32) opens and allows atmospheric pressure into the tank.When fluid returns to the tank, there is an air pressure build-up inside the tank. Once the air pressure is greater than the pressure of the spring (34), check valve (33) opens. This action allows the built up air pressure to vent to the atmosphere.Slow Return Check Valve
Illustration 3 g03136739
Slow return check valve
(7) Slow return check valve
(36) Auxiliary hydraulics changeover valve
(37) Check valve
(38) Spring The slow return check valve (7) is located