HARNESS AS-ENGINE 2763104 - Caterpillar

Makeup Valves
There are two makeup valves in the lift and tilt control valve. Makeup valve (4) is in the rod end of the tilt circuit, and makeup valve (19) is in the rod end of the lift circuit. The makeup valves will permit oil from the return line to combine with pump oil when the cylinder rods are retracted faster than the pump can supply oil to the cylinders. The makeup valves make sure enough oil is available so there is no cavitation (vacuum) in the cylinders.Makeup valve (4) operates when the rod end of the tilt cylinder is retracted fast when the bucket is dumped. When the pressure in passage (5) decreases enough, the pressure in passage (13) will become greater than the force of spring (3). Makeup valve (4) will move up and oil from passage (13) will flow into passage (5) and combine with the oil in the rod end of the tilt cylinder. Makeup valve (4) will operate in the same way when an outside force on the bucket causes the tilt cylinder to be retracted.During LOWER operation, makeup valve (19) operates the same way as makeup valve (4). During FLOAT operation, makeup valve (19) provides the float operation of the lift circuit.Kickout Systems
Lift Kickout
Lift Kickout Components
(1) Magnet assembly. (2) Holder for electrical switch. (3) Lift arm on left side. (4) Electric switch in the holder.
Pilot Valves Location
(5) Lift and tilt pilot valves.
Control Levers
(6)