ENGINE AR-PRIM 1214066 - Caterpillar

Illustration 1 g03791368
Medium Pressure (1) Main control valve (2) Oil cooler (3) Main relief valve (4) Auxiliary control valve (5) Rotator motor (6) Pilot manifold (7) Line (8) Line relief valves (9) Line (10) Left hydraulic pedal (11) Distribution block (12) Pressure switch (13) Hydraulic tank (14) Main Pump (15) Auxiliary pump (16) LineMedium pressure is designed to provide oil to the work tool for tool rotation. An auxiliary valve is used to control the oil flow. This valve is shifted with the left hydraulic pedal that allow the operator control over the tool rotation. An auxiliary pump is used to supply oil flow for medium pressure. A typical example of a work tool that will use medium pressure is a shear.ReferenceRefer to Testing and Adjusting, "Work Tool Parameter - Program" for the tool control system to change the settings for work tool operation.ReferenceRefer to Testing and Adjusting, "Medium Pressure: Default Value of Work Tool Parameters" for the Tool Control System to reference the factory settings.
Table 1
Operation Lever List    
Control     Extension     Retraction    
Left Hydraulic Pedal     Push Forward     Push Backward    Auxiliary Valve Extended
Illustration 2 g03791398
Medium Pressure (Extend) (1) Main control valve (2) Oil cooler (3) Main relief valve (4) Auxiliary control valve (5) Rotator motor (6) Pilot manifold (7) Line (8) Line relief valves (9) Line (10) Left hydraulic pedal (11) Distribution block (12) Pressure switch (13) Hydraulic tank (14) Main Pump (15) Auxiliary pump (16) LineWhen the device for activation is operated in the extend position, pilot oil flows from pilot manifold (6) to left hydraulic pedal (10). Pilot oil then flow through line (9) to auxiliary control valve (4). Pilot oil then shifts auxiliary control valve (4) allowing medium pressure oil from auxiliary pump (15) to rotator motor (5) .Oil returning from the rotator motor flows through auxiliary control valve (4), oil cooler (2), and back to hydraulic tank (13) .The working pressure for rotation is limited by main relief valve (3) .Auxiliary Valve Retracted
Illustration 3 g03791436
Medium Pressure (Retract) (1) Main control valve (2) Oil cooler (3) Main relief valve (4) Auxiliary control valve (5) Rotator motor (6) Pilot manifold (7) Line (8) Line relief valves (9) Line (10) Left hydraulic pedal (11) Distribution block (12) Pressure switch (13) Hydraulic tank (14) Main Pump (15) Auxiliary pump (16) LineWhen the device for activation is operated in the retract position, pilot oil flows from pilot manifold (6) to left hydraulic pedal (10). Pilot oil then flow through line (7) to auxiliary control valve (4). Pilot oil then shifts auxiliary control valve (4) allowing medium pressure oil from auxiliary pump (15) to rotator motor (5) .Oil returning from the rotator motor flows through auxiliary control valve (4), oil cooler (2), and back to hydraulic tank (13) .The working pressure for rotation is limited by main relief valve (3) .