PUSHER-STEM 5S2840 - Caterpillar

Illustration 1 g00577065
Resolver Valve Network (1) Pilot signal resolver valve (2) Pilot signal resolver valve (3) Switch assembly (pilot signal for the implement circuits) (normally closed switch) (4) Pilot signal resolver valve (5) Pilot signal resolver valve (6) Pilot signal resolver valve (7) Stick control spool (8) Boom control spool (9) Bucket bottom dump control spool (10) Front control valve (11) Load signal resolver valve (load signal network) (12) Load signal resolver valve (load signal network) (13) Signal duplication valve (14) Load signal resolver valves (load signal network) (15) Load sensing signal relief valve (16) Load signal resolver valves (load signal network) (17) Load signal resolver valves (load signal network) (18) Load signal resolver valves (load signal network) (19) Rear control valve (20) Switch assembly (pilot signal for the travel circuit) (normally closed switch) (21) Right travel control spool (22) Left travel control spool (23) Bucket bottom dump circuit (front shovel arrangement) (24) Pilot signal resolver valve (25) Pilot signal resolver valve (26) Pilot signal resolver valve (27) Load signal resolver valves (load signal network) (28) Load signal resolver valves (load signal network)The hydraulic system includes two systems of resolver valves. The network of pilot signal resolver valves ensures that the highest pilot signal which is generated during multiple function operation actuates the implement pressure switch (3). The network of load signal resolver valves ensures that the highest true load signal pressure which is generated in the implement or travel circuits goes to the signal duplication valve (13) .Operation of the Pilot Signal Resolver Valve Network
The network of pilot signal resolver valves ensures that the highest pilot signal which is generated during multiple function operation actuates the implement pressure switch (3) .Pilot signal oil enters the resolver valve network when any control spools are actuated. The network controls the path of the pilot signal oil. Each pilot signal resolver valve compares two pressure signals. The higher pressure signal of the two pressure signals passes to the next pilot signal resolver valve. The highest pressure signal passes to the implement pressure switch (3) after exiting the last pilot signal resolver valve.The pilot signal resolver valves are located in the left front housing of the front control valve (10). Additional pilot signal resolver valves are located in the rear control valve (19) . The pilot signal resolver valves for the front control valve perform the following functions:
Resolver valve (4) passes the