PIPE AS-EXHAUST 2441047 - Caterpillar

Table 1 lists the operating parameters for the solenoid for torque control. When the solenoid is energized, the pump is in the high torque mode. When the solenoid is de-energized, the pump is in the low torque mode.When the direction selector is in the FORWARD or REVERSE, the new solenoid for torque control (4) will not be energized until a certain engine rpm is obtained. The solenoid for torque control (4) is not energized until the engine reaches a higher engine speed. Then, all of the power from the engine can be utilized by the power train.When you operate the machine, the power train system and the hydraulic system will utilize the engine horsepower. When the solenoid for torque control (4) is energized or de-energized due to the engine rpm, there is a slight delay in operation. The delay occurs when you change the direction selector. The delay will help stabilize the engine and the hydraulic system.Parameters for the Solenoid for Torque Control without the Direction Selector (Backhoe Operation)
Table 2
The New Solenoid for Torque Control Without the Direction Selector (Backhoe Operation)    
Model     The Solenoid is Energized.     The Solenoid is De-energized.    
    High Torque     Low Torque    
432E     1200 rpm     1100 rpm    
434E     1200 rpm     1100 rpm    
442E     1200 rpm     1100 rpm    
444E     1200 rpm     1100 rpm    Table 2 lists the operating parameters for the new solenoid for torque control (4) without the use of the direction selector. When the solenoid is energized, the pump is in the high torque mode. When the solenoid is de-energized, the pump is in the low torque mode.When the direction selector is in the NEUTRAL position, the new solenoid for torque control (4) will not be energized until a certain engine rpm is obtained.When the direction selector is in the NEUTRAL position, the solenoid for torque control (4) is de-energized in order to reduce the hydraulic demand on the engine. The solenoid for torque control (4) will also prevent the engine from a stall.When the solenoid for torque control (4) is energized or de-energized due to the engine rpm, there is a slight delay in operation. The delay will help stabilize the engine and the hydraulic system.Torque Limiter in the Open position
Illustration 9 g01293626
(1) Torque control (1A) Spring (2) Flow compensator (2A) Spring (3) Torque limiter (4) Solenoid for torque control (5) Pump controller (6) Pump (7) Bias piston (8) Spring (9) Swashplate (10) Actuator piston (12) Piston (intake) (13) Piston (14) Outlet manifold for the backhoe (15) Relief valve for the margin pressure (flushing valve) (16) Input for the Load signal (17) Drain valve for the signal pressure (18) Relief valve for the signal pressure (19) Orifice (20) Pump output (21) Stop for the minimum angle (22) Relay (23) ECMThe torque limiter (3) monitors the pump swashplate angle and the pump discharge pressure.