EQUIPMENT DESCRIPTION (Contd)
PALLET EQUIPMENT FEATURES (Contd)
CONTROL VALVES The distribution system for all pallet hydraulic
functions that consist of five single and eight double spool-type valves of
which 12 are mounted on hydraulic main manifold and one on crossmember
adjacent to forward pin wheel drive. Each control valve is identified by
solenoid code KY followed by its assigned number. Solenoid codes are printed
on a white band on the electrical lead for each solenoid. Single control valves
actuate in one direction only and utilize one solenoid. Double control valves
actuate in both directions and utilize two solenods. Control valves can be
manually operated by depressing and holding button on valve. Control valves
KY1, KY22, and KY23 can be locked in depressed position. Control valve
KY20 does not have a button for manual operation.
Control valve numbers KY2 and KY3 are no longer used.
KY1* - Main control valve that supplies hydraulic pressure to hydraulic manifold.
KY1 works in conjunction with all other control valves.
KY4 - Operates forward pin wheel drive to deploy lower bridge half.
KY5 - Operates forward pin wheel drive to retrieve lower bridge half.
KY6 - Operates rear pin wheel drive to deploy lower bridge half.
KY7 - Operates rear pin wheel drive to retrieve lower bridge half.
KY8 - Extends driver's side supporting cylinder to lift pallet.
KY9 - Retracts driver's side supporting cylinder to lower pallet.
KY10 - Extends passenger side supporting cylinder to lift pallet.
KY11 - Retracts passenger side supporting cylinder to lower pallet.
KY12 - Operates four transverse handling unit expanding cylinders to retract
KY13 - Operates four transverse handling unit expanding cylinders to extend bridge
KY14 - Raises secondary boom.
KY15 - Lowers secondary boom
KY16 - Retracts lower support boom.
KY17 - Extends lower support boom.
KY18 - Operates swivel drive to lower launch boom.
KY19 - Operates swivel drive to raise launch boom.
KY20 - Operates lower support boom in conjunction with KY17 to increase flow rate
of hydraulic fluid.
KY21* - Provides high pressure to winch motor to increase lifting capacity for
pay-in and pay-out of wire rope as controlled by remote control unit (RCU)
or winch emergency switch. Manually depressing KY21 alone will not
pay-in or pay-out wire rope.
KY22* - Provides low pressure to winch motor for pay-in and pay-out of wire rope
as controlled by RCU or winch emergency switch. Manually depressing
KY22 alone will not pay-in or pay-out wire rope.
KY23* - Operates end stop hydraulic cylinder.
* Single spool valve.