INSULATOR 4808340 - Caterpillar

Illustration 1 g00796352
Location of Components on Bank Valve (1) Valve for quick coupler (pins) (2) Gallery (return) (3) Passage (4) Adjusting screw (boom lower) (5) Passage (load sensing) (6) Adjusting screw (boom retract) (7) Line to dual relief valve (8) Relief valve for quick coupler (tilt) (9) Dual relief valve (10) Relief valve for auxiliary services (11) Signal relief valve (12) Port (return from stabilizer control valve) (13) Passage (return) (14) Regulator valve (15) Port (load sensing from stabilizer control valve) (16) Port (supply to stabilizer control valve) (17) Gallery (supply) (18) Orifice (19) Load check valve (20) Resolver valve (21) Flow control valve (22) Port (steering supply) (23) Port (inlet) (24) Pressure reducing valve (25) Port (load sensing to pump) (26) Port (return to hydraulic tank) (27) Port (load sensing from steering) (28) Port for quick coupler (pins) (29) Inlet section (30) Implement section for boom raise/lower (31) Implement section for boom extend/retract (32) Implement section for quick coupler (tilt) (33) Implement section for auxiliary services (34) Implement section for frame leveling (35) End section
Illustration 2 g00760218
Location of Bank ValveThe bank valve is located on the right side of the machine in the engine enclosure.The pump delivery line is connected to port (23) of inlet section (29). The inlet section is equipped with pressure reducing valve (24), flow control valve (21) and valve (1) for the quick coupler.Pressure reducing valve (24) supplies the pilot control system by way of the joystick control. The pressure reducing valve also supplies the service brake boost pressure. The pressure reducing valve is preset at 2650 150 kPa (385 20 psi). This is not adjustable.Flow control valve (21) provides priority flow to the steering from port (22). When the flow requirements of the steering system have been met, supply oil flows through gallery (17) which passes through implement sections (30), (31), (32), (33), and (34) to end section (35). Port (27) is connected to a load sensing line from the steering system in order to provide a pilot signal to the flow control valve.The main return of oil to the hydraulic tank is through gallery (2) that is connected from the end section of the bank valve through the implement sections to port (26) .Valve (1) increases the auxiliary system pressure in order to disengage the pins for the quick coupler. Port (28) for the valve is externally connected to dual relief valve (9) through line (7). The valve is operated by a solenoid which is controlled by a switch on the instrument panel. The dual relief valve, which operates at a lower pressure for the auxiliary services, operates at a higher pressure when the solenoid is energized. The stem of the valve is held by spring force in order to close the port when the solenoid is de-energized.All the implement sections are equipped with a directional spool that is spring centered. When the controls are in the HOLD position, the directional spool is in the NEUTRAL position and the directional spool