VALVE A,CONT 1033650 - Caterpillar

Outputs
The ECM responds to decisions by sending electrical signals to the outputs. The outputs can create an action or the outputs can provide information to the operator or the service technician.Solenoids
Oscillating Axle Lock
Illustration 12 g03348759
Table 5
Rated Voltage     24 VDC    
Coil Resistance     32.0 3.2Ω (T=20 C)    The MH3059 is equipped with an oscillating axle lock. The oscillating axle improves the stability of the machine when the machine is traveling over rough terrain. The oscillating axle should be locked while the machine is digging or traveling at slow speeds.The oscillating axle is locked when the oscillating axle lock solenoid valves are de-energized. The oscillating axle lock solenoid valves are de-energized when the oscillating axle button is in the OFF position.When the oscillating axle lock solenoid is de-energized, oil is prevented from returning to the hydraulic tank.The oscillating axle is allowed to move when the axle lock solenoid valve is energized. The oscillating axle lock solenoid is supplied by a connection to anti-cavitation oil flowing from the pump. The pressure at the axle cylinder is approximately 690 kPa (100 psi).For more information on the Oscillating Axle, refer to Systems Operation, "Oscillating Axle".Brake and Shift Solenoids
Illustration 13 g03680741
Lower main control valve (10) Park brake solenoid (11) Travel speed solenoidWhen there is a request to disengage the park brake, the IQAN system sends a signal to park brake solenoid (10) . This action will send pilot oil to release the spring brakes at each wheel drive.The IQAN system shifts the displacement of all wheel motors simultaneously using travel speed solenoid (11) . When travel speed solenoid (11) is activated, pilot oil will be sent to each of the displacement change valves on the travel motors. When a displacement change valve receives a pilot oil signal, a change in displacement of the motor will occur by increasing or decreasing the angle of the swashplate. Propel Solenoids "A" and "B"
The machine propel speed is selected with the right joystick button. The signal for the creeper/standard speed button is sent to lower control module "1". The control module communicates the request to the master module via the J1939 Data Link. The master control module relays the signal to the propel solenoid. The propel solenoids are connected to the control valve and control the direction of travel. The travel speed solenoid will ultimately control the displacement of the travel motors. When the master control module activates the travel speed solenoid (high speed request), pilot oil is sent to the displacement change valve at each travel motor. The swashplate on the travel motor can now be controlled to a maximum angle. Under this condition, the machine will be driven by high speed and low torque. When the displacement solenoid is closed, the swash plate will move to the minimum angle. Under this condition the machine will be driven by low speed and high torque.The machine can travel at up to 5 km/h (3 mph) when in creeper mode. When the machine is in standard mode,