GEAR-SUN 1217630 - Caterpillar

Tow Point Manifold
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Right Side of Machine (1) Tow point manifold (2) Right hopper raise solenoid (3) Grade control pressure tap (4) Right tow point raise solenoid (5) Right hopper lower solenoid (6) Pressure reducing valve (7) Counterbalance valve (one of two) (8) Right tow point lower solenoid (9) Auxiliary pump pressure tapThe machine is equipped with two tow point manifolds. Right tow point manifold (1) is mounted to the front bulkhead which is on the right side of the machine. The front side cover provides access to the right tow point manifold. The left tow point manifold is mounted on the left side of the machine in the same relative position.The tow point manifolds contain four ports. Each port is identified with a letter which is stamped into the block next to the port. Each tow point manifold is equipped with four solenoids.The right tow point control switches operate right tow point raise solenoid (4) and right tow point lower solenoid (7). The left tow point control switches operate the left tow point raise solenoid and the left tow point lower solenoid.The active hopper control switch operates the left and right hopper raise solenoid and the left and right hopper lower solenoid.The solenoid can be identified by the wiring. The following wire numbers identify the solenoid:
A855-GY wire (left hopper raise solenoid)
A861-BR wire (left hopper lower solenoid)
A859-PU wire (right hopper raise solenoid (2) )
A861-BR wire (right hopper lower solenoid (5) )
K793-BU wire (left tow point raise solenoid)
K792-GN wire (left tow point lower solenoid)
K795-BR wire (right tow point raise solenoid (4) )
K794-YL wire (right tow point lower solenoid (8) )Pressure tap (3) can be used in order to measure supply pressure from the auxiliary pump.The tow point manifold is equipped with two counterbalance valves (7) (one shown). The counterbalance valves prevent the tow point from being raised or lowered unless the appropriate tow point solenoid is energized. The counterbalance valves are set at 13100 kPa (1900 psi).
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Right Side of Machine (1) Arc suppressor (2) Arc suppressorArc suppressors are mounted under the tow point manifold on the right side of the machine. The front side cover provides access to the right arc suppressors. The left arc suppressors are mounted on the left side of the machine in the same relative position. Each hopper solenoid has associated arc suppressor (1) and (2) .Truck Hitch Manifold
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Right Side of Machine (1) Pressure tap port "G" (2) Truck hitch manifold (3) Hitch open solenoid (4) Hitch close solenoid (5) Pressure reducing valveTruck hitch manifold (2) is mounted to the right side of the pump compartment on the right side of the machine. The deck plate on the platform of the machine provides access to this manifold. The ports in this manifold are marked for identification.Truck hitch manifold (2) is equipped with two solenoids. Hitch open solenoid (3) is the rear solenoid on the left face of the manifold. Hitch close solenoid (4) is the front solenoid on the left face of