TM 5-5420-280-23&P
0002 00
EQUIPMENT DESCRIPTION (Contd)
PALLET EQUIPMENT FEATURES (Contd)
AU
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 solenoids. 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.
NOTE
Control valve numbers KY2 and KY3 are no longer used.
KY1* - Main control valve that supplies hydraulic pressure to hydraulic manifold. KY1 must be locked in
depressed position before manually operating 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 bridge quarters to travel
position.
KY13 - Operates four transverse handling unit expanding cylinders to extend bridge quarters to operating
width.
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 play-in and pay-out of wire
rope as controlled by remote control unit (RCU) or winch emergency switch. Manually depressing
KY21 alone will not play-in or pay-out wire rope.
KY22* - Provides low pressure to winch motor for play-in and pay-out of wire rope as controlled by RCU or
winch emergency switch. Manually depressing KY22 alone will not play-in or pay-out wire rope.
KY23* - Operates end stop hydraulic cylinder.
* Single spool valve.
NOTE
Swivel drive flow control valve not shown. Mounts with KY 18KY 19.
0002 00-18
