ENGINE AR 3949657 - Caterpillar

Illustration 8 g02722460
Electric Controls in the cab
(A) Joysticks with Thumb wheel
(B) Electric Foot Pedal
(C) Foot Switch Medium Pressure Hydraulic System
A machine configured with a Medium Pressure system is only found on machines with Combined Function with Electric Control and will have the following components:
Medium Pressure control valve located in the swing motor compartment.
Two proportional reducing valves located below the medium pressure control valve.
Electric control in the cab.Refer to Illustration 9 and 10 for component descriptions.
Illustration 9 g03618978
Medium pressure valve with proportional reducing valves for control located in the swing motor compartment (cab side)
Note: For Reduced Radius (RR) and Compact Radius (CR) machines, this valve is mounted on the boom.
Illustration 10 g02722564
Left Joystick with Thumb wheel
Combined Function - Hydraulic Control
A machine configured with a Combined Function with Hydraulic Control will have the following components:
Two variable relief valves located in the swing motor compartment above the boom foot.
Four proportional reducing valves to control the attachment control valves located in the main pump compartment.
Hydraulic controls in the cabRefer to Illustrations 11, 12, and 13 for component descriptions.
Illustration 11 g03618777
Two Variable Reliefs located above the boom foot
Note: For Reduced Radius (RR) and Compact Radius (CR) machines, these valves are mounted on the boom.
Illustration 12 g03620996
Four Proportional Reducing Valves located in the pump compartment
Note: For Reduced Radius (RR) and Compact Radius (CR) machines, these valves are located behind the main control valve.
Illustration 13 g02722595
Hydraulic foot pedals located in the cab
Combined Function - Hydraulic Control with Medium Pressure
A machine configured with a Medium Pressure system for Combined Function will have the following components:
Medium Pressure control valve located in the swing motor compartment.
Hydraulic control in the cab.Refer to Illustration 14 and 15 for component descriptions.
Illustration 14 g03620644
Medium pressure valve located in the swing motor compartment (cab side)
Note: For Reduced Radius (RR) and Compact Radius (CR) machines, this valve is mounted on the boom.
Illustration 15 g02722600
Hydraulic foot pedal located in the cab
One-Way / One or Two Pumps - Hydraulic Control
A machine configured with a One-Way flow from One or Two Pumps with Electric Control will have the following components:
One mechanical relief valve located in the swing motor compartment above the boom foot.
Two proportional reducing valves to control the attachment control valves located in the main pump compartment.
Hydraulic controls in the cabRefer to Illustrations 16, 17, and 18 for component descriptions.
Illustration 16 g03618842
Mechanical Tool Relief located above the boom foot
Note: For Reduced Radius (RR) and Compact Radius (CR) machines, this valve is mounted on the boom.
Illustration 17 g03621416
Two Proportional Reducing Valves located in the pump compartment
Note: For Reduced Radius (RR) and Compact Radius (CR) machines, these valves are located behind the main control valve.
Illustration 18 g02722605
Hydraulic foot pedal located in the cab