PLATE-REINFORCEMENT 2543520 - Caterpillar

Illustration 1 g01400526
(1) Pressure compensator spool
(2) Flow compensator spool
(3) Load sensing signal
(4) Margin spring
(5) Cutoff spring
(6) Case drain passage
(7) Pump output
(8) Large actuator
(9) Swashplate
(10) Drive shaft
(11) Small actuator and bias spring
(12) Piston and barrel assembly
(13) Signal passage to large actuator
(BB) Cutaway section
(CC) Component surface
(FF) Activated component
(GG) Tank pressure The implement hydraulic pump is a variable displacement axial piston pump. The pump is load sensing, pressure compensated, and flow compensated. The output of the pump is dependent upon the system demands that are sensed by the compensator valve.The pump compensator valve has the following components:Pressure compensator spool (1) and cutoff spring (5) - When the output pressure of the pump is great enough to overcome the force of the cutoff spring, the pressure compensator spool shifts upward which allows oil into the large actuator in order to destroke the pump.Flow compensator spool (2) - The load sensing signal and the margin spring apply pressure on the top of the spool. The pump output pressure acts on the bottom of the spool. The flow compensator spool shifts upward in order to regulate pressure in the large actuator.Margin spring (4) - When the engine is OFF, the flow compensator spool does not have oil pressure on either end. The margin spring pushes the flow compensator spool downward in order to keep the large actuator open to the case drain line. When the engine is started, the bias spring applies force to the swashplate in order to push the swashplate toward the maximum angle.The implement hydraulic pump has the following components:Large actuator (8) - When oil pressure increases behind the large actuator piston, the piston will overcome the force of the small actuator and bias spring which causes the angle of the swashplate to be reduced.Swashplate (9) - The displacement of the pump is controlled by the angle of the swashplate. When the swashplate is at a maximum angle, the pistons move the maximum volume of oil in and out of the rotating barrel.Drive shaft (10) - The rotation of the pump is clockwise when the pump is viewed from the drive end. The piston and barrel assembly is splined to the drive shaft.Small actuator and bias spring (11) - When the oil pressure behind the small actuator piston becomes greater than the force of the oil pressure behind the large actuator, the angle of the swashplate will be increased. If there is no pressure behind the large actuator piston, the bias spring will hold the swashplate at the maximum angle.Piston and barrel assembly (12) - The barrel contains nine pistons. The piston and barrel assembly rotates whenever the engine is running. The pistons move oil into the barrel and out of the barrel.
Illustration 2 g01400569
Compensator valve (engine off)
(1) Pressure compensator spool
(2) Flow compensator spool
(3) Load sensing signal
(4) Margin spring
(5) Cutoff spring
(6) Case drain passage
(7) Pump output
(13) Signal passage to large actuator
(14) Adjustment screw
(15) Orifice
(BB) Cutaway section
(CC) Component surface
(FF) Activated component
(GG) Tank pressure The compensator valve is bolted to the implement pump. The compensator