SCREW-RHM 1050152 - Caterpillar

Introduction
Smart Boom function is an attachment to make following operations easier and more effective:
Ground rock removal using a stick operation only
Hammer operation by using only the weight on the front structure
Material handling operation with a grapple work tool
Illustration 1 g06231523
Smart Boom hydraulic schematic
(1) Port from main control valve to boom lowering control valves
(2) Boom 2 control valve
(3) Boom 1 control valve
(4) Port from main control valve to boom cylinder rod ends
(5) Hydraulic tank
(6) Pump 1
(7) Pump 2
(8) Boom cylinders
(9) Boom lowering control valve
(10) Boom rod end pressure sensor
(11) Boom up electrical check solenoid
(12) Smart boom unload valve
(13) Smart boom down EPRV
(14) Boom head end pressure sensor
(15) Shuttle valve
(16) Swing makeup lineComponent Locations
Illustration 2 g06232088
SmartBoom system layout
(8) Boom cylinders
(9) Boom lowering control valve
(10) Boom rod end pressure sensor
(11) Boom up electrical check solenoid
(12) Smart boom unload valve
(13) Smart boom down EPRV
(14) Boom head end pressure sensor
(15) Shuttle valve
(16) Swing makeup lineThe SmartBoom system is able to select from the following modes using the monitor:
UP and DOWN (Boom Float)
DOWN Only
SmartBoom OffIf the machine has the SmartBoom system, the machine will be equipped with the following:
Boom rod end pressure sensor (10)
Boom up electrical check solenoid (boom float UP solenoid) (11)
Smart boomdown EPRV (13)
Boom head end pressure sensor (14)During operation of the SmartBoom function, the operator may wish to apply downward force to the boom. The operator can disable the SmartBoom function temporarily with the SmartBoom disable switch. While the trigger switch is pressed, BOOM RAISE and BOOM LOWER will operate in the normal modes. The SmartBoom disable switch is a configurable switch."Down Only" mode: The boom will lower by the weight of the boom when the control lever is moved to the BOOM LOWER position. This mode prevents the boom from moving upward. To move the boom upward, the operator must use the boom control joystick to activate the BOOM UP mode."Up & Down" mode: When the joystick is moved to the BOOM DOWN position, the boom will lower by the weight of the boom. The boom can move upward freely.Boom DOWN Only Mode
Illustration 3 g06231165
SmartBoom hydraulic schematic (boom down only)
(1) Port from main control valve to boom lowering control valves
(2) Boom 2 control valve
(3) Boom 1 control valve
(4) Port from main control valve to boom cylinder rod ends
(5) Hydraulic tank
(6) Pump 1
(7) Pump 2
(8) Boom cylinders
(9) Boom lowering control valve
(10) Boom rod end pressure sensor
(11) Boom up electrical check solenoid
(12) Smart boom unload valve
(13) Smart boom down EPRV
(14) Boom head end pressure sensor
(15) Shuttle valve
(16) Swing makeup lineIf the joystick is moved to a boom DOWN position while in "Boom DOWN Only" mode the Boom 1 control valve (3) does not shift and the valve stays in the NEUTRAL position.While a "Boom DOWN Only" mode operation is being performed, Smart boom down EPRV (13) provides pilot pressure to boom lowering control valve (9) and Smart boom unload valve (12). Hydraulic oil flows from the head end of boom cylinders (8), through boom lowering control valves (9), and through valve (12). The oil then