ENGINE AR 4P1223 - Caterpillar

Specifications
The following is a list of the ejector specifications for the model 623K machines:
Table 1
Ejector Forward Time (full stroke @ high idle) 3.46 0.3 sec
Ejector Return Time (full stroke @ high idle) 2.69 0.3 sec
Floor Forward Time (full stroke @ high idle) 7.00 0.3 sec
Floor Return Time (full stroke @ high idle) 3.07 0.3 sec
Max Ejector Cylinder Extension Force 245 kN (55078 lb)
Max Ejector Cylinder Retraction Force 145 kN (32597 lb)
Max Floor Cylinder Extension Force 342 kN (76885 lb)
Max Floor Cylinder Retraction Force 196 kN (44063 lb) Functional Overview (621K and 627K)
The 621K and 627K Implement control valve consists of the following components:1. Inlet manifold valve section.
Pressure reducing valve for pilot pressure.
Pilot pressure lockout solenoid.
Load-sense duplicator valve.
Load-sense relief valve.2. Bowl control valve section.
Bowl control directional valve.
Bowl raise solenoid valve.
Bowl lower solenoid valve.
Bowl cylinder cap-end anti-cavitation valve.
Bowl cylinder rod-end anti-drift valve.3. Right bowl control valve section.
Bowl control directional valve.
Bowl raise solenoid valve.
Bowl lower solenoid valve.
Bowl cylinder cap-end anti-cavitation valve.
Bowl cylinder rod-end anti-drift valve.4. Ejector control valve section.
"Ejector Control Directional" valve.
"Ejector Forward" solenoid valve.
"Ejector Retract" solenoid valve.5. Apron control valve section.
Apron control directional valve.
Apron lower solenoid valve.
Apron raise solenoid valve.
Apron cylinder rod-end work port relief valve.
Apron cylinder cap-end work port relief valve.6. Apron sequence valve.
Apron relief valve.7. Cover manifold valve section.
Margin relief valve.The inlet cover of the implement control valve contains the pressure reducing valve, pilot lockout solenoid, load-sense duplicator valve, and load-sense relief valve. The pressure-reducing regulates the maximum pressure that will be provided for implement pilot pressure. The fluid pressure from the pressure-reducing valve is provided to the pilot pressure accumulator for energy storage. The pressure from the valve also serves the implement solenoid control valve to allow for proper functionality of the implement directional valves. The pilot pressure lockout solenoid allows for the disabling of the implement controls. When the pilot lockout solenoid is engaged, pilot pressure from the pressure-reducing valve is sent to the implement control solenoids. When the pilot lockout solenoid is de-energized, pilot pressure from the pressure-reducing valve is sent to the implement control solenoids. The load-sense relief valve controls the maximum system pressure supplied to the implement control valve. System pressure from the working pressures of the implements reaches the load-sense relief valve. When the working pressure of one of the implements reaches the load-sense relief setting the valve shifts, causing the piston pump to de-stroke.The ejector control valve section controls the extension and retraction of the ejector implement function. When the ejector "Forward Retract" solenoid is proportionally engaged, the ejector directional valve sends hydraulic oil to the ejector cylinder cap-end extending the cylinder. When the ejector directional valve is in the ejector forward position,