BRACKET AS 5364142 - Caterpillar

Load Check Valve
Load check valve (23) prevents reverse oil flow from the lift cylinders which can cause cylinder drift or load loss. The load check valve will not open until pump oil pressure in chamber (21) creates a force against load check valve (23) that is higher than the opposing force against the other side of the check valve. The opposing force is the sum of the force of spring (24) and the force that is created by the oil pressure in passage (22) .Makeup Valve
Makeup valve (6) is in the head end of the lift circuit. The makeup valve opens when cylinder oil pressure in passage (5) drops approximately 14 kPa (2 psi) below the return oil pressure in outlet passage (4) . Makeup valve (6) adds return oil in outlet passage (4) to cylinder oil in passage (5) . The additional oil prevents cavitation (vacuum) in the lift cylinders.Basic Valve Operation
Illustration 2 g00857205
Illustration 3 g00857124
When the control valve spool, all of the implement valve spools, and the steering valve spools are in the HOLD position, pump oil through the steering control valve flows to inlet passage (18) . Then, oil flows around the flow control valve and into metering slots (20) . Oil through metering slots (20) moves the flow control valve against spring (16) . This valve movement allows all the oil flow through inlet passage (18) to flow to the next control valve. Because all the valve spools are in the HOLD position, pump oil fills the parallel oil passage of the control valves. The pump maintains the pressure at approximately 3000 kPa (435 psi). Passage (2) , chamber (8) , passage (10) , resolver (11) , and passage (13) are drained. The oil that is in passages (3) , (5) , and (22) is blocked.
Illustration 4 g00857230
Illustration 5 g00857231
When pilot