Model 4700 Maintenance Manual Optional Fingertip Controls
Section 8. Theory of Operation Auxiliary Functions
Sideshift When sideshift is requested, the sideshift switch (SW21 or SW22) closes, which is sensed by the Armrest Board. Output voltage from the sideshift pot (P6) is also sensed by the Armrest Board. The Armrest Board encodes the sideshift request into a digital message and communicates it to the Hydraulic Control Board via the CAN-Bus. The Hydraulic Control Board relays the RPM to the PPA. The PPA generates the correct voltage to the pump motor to run the pump. The Hydraulic Control Board interprets the message and provides controlling voltage to the sideshift solenoids (EV5 or EV6) from a coil driver located on the board. Oil is pumped through the energized sideshift solenoid (EV5 or EV6) to the sideshift cylinders. A flow restrictor in the solenoid valve provides correct flow for sideshift. When sideshift is not requested, all fluid bypasses the sideshift valve and is either available for use by other functions or returned to the reservoir.
Publication 1160093, Issued: 20 May 2013
8-11
