320 GX and 323 GX Excavator Systems Swivel Caterpillar

Swivel

320 GX and 323 GX Excavator Systems [M0120170]

320 GX and 323 GX Excavator Systems Travel Counterbalance Valve

320 GX and 323 GX Excavator Systems Solenoid Valve (Hydraulic Lockout)

HYDRAULIC SYSTEM

SWIVEL GP

320 GX and 323 GX Excavator Systems Swivel

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Illustration 1	g06609024
Swivel (1) Housing (2) Port "D" (3) Port "A" (4) Rotor (5) Port (Drain) (6) Port "B" (7) Port (Pilot) (8) Port "C" (9A) Port (Pilot) (9B) Port (Pilot) (10) Passage "D" (11) Passage "A" (12) Passage "C" (13) Passage "B" (14) Port (Drain) (15) Port "A" (16) Port "B" (17) Port "D" (18) Port "C" (19) Passage (Drain)

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Table 1
Identification of Port and Circuit
Ports (Housing)	Ports (Rotor)	Circuit
18	8	Right travel (reverse) "C"
17	2	Right travel (forward) "D"
15	3	Left travel (forward) "A"
16	6	Left travel (reverse) "B"
14	5	Drain
9A	7	Pilot (Left Travel Speed)
9B	7	Pilot (Right Travel Speed)

The swivel accomplishes two functions. The swivel supplies pump oil from the upper structure to the travel motors of the lower structure. The upper structure swings. The lower structure does not swing. The swivel returns oil from the travel motors to the hydraulic tank.

Housing (1) is bolted to the upper structure. Rotor (4) rotates within housing (9). A support arm is bolted to rotor (4) to prevent rotation. The ports of housing (1) are open to the ports of rotor (4). The passages in housing (1) and the passages in rotor (4) connect the ports.

Seals for high pressure and seals for low pressure are provided between the sliding surfaces of housing (1) and rotor (4). The seals prevent oil leakage between the passages.