LEVER-ACTUATING 1323821 - Caterpillar

Illustration 1 g02408816
Right travel motor (FORWARD TRAVEL)
(1) Rotary group
(2) Gauge port (service)
(3) Swashplate control piston
(4) Gauge port (stroking pressure)
(5) Line relief valves
(6) External supply port
(7) Counterbalance valve
(8) Check valves
(9) Shuttle valve
(10) Brake pilot valve
(11) Port (pump oil)
(12) External port (parking brake)
(13) Port (pump oil)
(14) Travel motor circuit
(15) Case drain port
(16) Displacement change valve
(17) Gauge port (service)
(18) Internal port (parking brake)
Illustration 2 g02408817
Rotary Group
(3) Swashplate control piston
(19) Drive shaft
(20) Bearings
(21) Housing
(22) Pin
(23) Pistons
(24) Retainer
(25) Adjustment screw (output flow)
(26) Barrel
(27) Spring
(28) Swashplate Small Displacement Change Operation
When the travel speed control switch on the control panel is set at the HIGH SPEED position, the travel speed solenoid valve that is located on the pilot manifold is de-energized. The pilot system oil flows through a port to displacement change valve (16) in the motor head.The pilot oil forces a spool in displacement change valve (16) to shift. Oil from the pump moves swashplate control piston (3). The angle of swashplate (28) decreases. As a result, the motor displacement is decreased and travel speed is increased.Large Displacement Change Operation
When the angle of swashplate (28) in the travel motor increases, the displacement of the travel motor increases. The angle of swashplate (28) in the travel motor will increase and the travel speed will decrease when the travel speed control switch is moved to the LOW SPEED position.When the travel speed control switch on the control panel is moved to the LOW SPEED position, the travel speed solenoid is energized. The pilot system oil is blocked. The spool in displacement change valve (16) is shifted by the force of the spring in displacement change valve (16). Oil from the pump moves swashplate control piston (3). This increases the angle of swashplate (28). The angle of swashplate (28) increases and the displacement of the travel motor increases. The travel speed decreases.