CYL GP-TEL 210 5475310 - Caterpillar

Swing angle sensor (38) is also part of the swing system. The swing angle sensor measures the angular rate of the upper structure as the machine swings. The sensor information is used as an input to the main control valve algorithm.Reference: For more information concerning the operation of the swing motor, refer to Systems Operation, "Swing Motor".Reference: For more information concerning the operation of the swing drive, refer to Systems Operation, "Swing Drive".Reference: For more information concerning the operation of the swing parking brake and the swing brake solenoid valve, refer to Systems Operation, "Pilot Valve (Swing Parking Brake)".
Illustration 3 g06197214
Main control valve
(2) Swing brake solenoid
(5) Swing control valve
(6) Swing left solenoid
(21) Swing right solenoidSwing control valve (5) consists of a swing right solenoid (6) and swing left solenoid (21) which are controlled by the machine ECM.
Illustration 4 g06196273
Compartment for the swing motor (typical example)
(10) Line
(17) Main control valve
(28) Swing motor
(31) Line
(32) Make-up line
(33) Line
(34) LineThe oil delivery from pump 2 (37) flows through parallel feeder passage (7) in main control valve (17) to swing control valve (5). The oil delivery from pump 1 (36) flows through center bypass passage (15) in main control valve (17). Illustration 1 shows main control valve (17) when only the swing hydraulic circuit is activated.The oil delivery from pump 2 (37) also flows through parallel feeder passage (7) to pressure reducing valve (12). Pilot oil then flows through check valve (14) to swing brake solenoid (2) and to hydraulic lockout solenoid (20). When the hydraulic lockout lever is in the UNLOCKED position, the machine ECM energizes hydraulic lockout solenoid (20). Pilot oil flows through hydraulic lockout solenoid to swing right solenoid (21) and swing left solenoid (6). During a swing operation the joystick position sensor sends an input signal to the machine ECM. The machine ECM then energizes swing brake solenoid (2). The swing brake solenoid valve shifts. Pilot oil flows through pilot line (10) to swing parking brake (27). The swing parking brake releases in order to enable a swing operation.When the swing joystick is moved to the SWING RIGHT position, the machine ECM energizes swing right solenoid (21). Pilot oil from pressure reducing valve (12) flows through passage (11), hydraulic lock solenoid (20), swing right solenoid (21), and to swing control valve (5). Pilot oil shifts the spool in swing control valve (5). The machine ECM also energizes swing brake solenoid valve (2). Swing brake solenoid valve (2) shifts. Pilot oil flows through line (10) to swing parking brake (27). Swing parking brake (27) releases in order to enable a swing operation.The oil delivery from pump 2 (37) flows through parallel feeder passage (7) and through swing control valve (5). The oil then flows through line (34) to swing motor (28). Swing motor (28) rotates and the upper structure swings to the right.Return oil from swing motor (28) flows through line (33) to main control valve (17). The return oil flows through swing control valve (5), return passage (4), and slow return