308C CR Excavator Hydraulic System – Swivel

Illustration 1 g00757869

Swivel

(1) Cover

(2) Port

(3) Port

(4) Housing

(5) Port

(6) Port

(7) Seals

(8) Seal

(9) Rotor

(10) Port

(11) Port

(12) Port

(13) Port

(14) Flange

(15) Port

(16) Port

(17) Port

(18) Port

(19) Port

(20) Port

(21) Port

(22) Port

(23) Swivel

(24) Front of the machine

(25) Dust seal
Table 1
Identification Of Port And Circuit    
Ports (Housing)     Ports (Rotor)     Circuit    
12     16     Right travel (reverse)    
11     15     Right travel (forward)    
5     22     Left travel (forward)    
6     21     Left travel (reverse)    
2     18     Drain    
13     20     Automatic travel speed change    
3     19     Blade (lower)    
10     17     Blade (raise)    

Swivel (23) accomplishes two functions. Swivel (23) 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. Swivel (23) returns oil from the swing motors and travel motors to the hydraulic tank.

Housing (4) is bolted to the upper structure by support. Rotor (9) is bolted to the lower structure through flange (14). The ports of housing (4) are open to the ports of rotor (9). The passages in housing (4) and the passages in rotor (9) connect the ports.

Seals (7) for high pressure and seal (8) for low pressure are provided between the sliding surfaces of housing (4) and rotor (9). Seals (7) and (8) prevent oil leakage between the passages.