3843855 WIRING GP-PLATFORM Caterpillar parts
Rating:
Alternative (cross code) number:
CA3843855
384-3855
3843855
CA3843855
384-3855
3843855
Weight: 28 pounds 12 kg.
Number on catalog scheme:
25
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Information:
Boom Raise Operation
Illustration 1 g00309329
Boom Cylinder Lines Group (1) Supply line for boom cylinder head end. (2) Boom lowering control valve. (3) Supply line and return line for boom cylinder rod end.
Illustration 2 g00309334
Hydraulic Schematic of Boom Lowering Control Valve (4) Check valve. (5) Port to head end of boom cylinder.When the boom pilot control valve is moved to the BOOM RAISE position pump oil from line (1) flows into the boom lowering control valves (2) . The pump oil passes through check valve (4) and flows into the head end of the boom cylinders.The oil in the rod end of the boom cylinders goes through line (3) , and back to the hydraulic tank through the boom control valve.When the implement control lever is moved to the NEUTRAL position, the boom cylinders are held in the raised position. Check valve (4) prevents the oil in the head end of the boom cylinders from flowing out of the boom cylinders.Boom Lower Operation
Illustration 3 g00309443
Lines Group (Pilot Oil and Boom Cylinders) (2) Boom lowering control valve. (3) Supply line and return line for boom cylinder rod end. (6) Pilot oil supply line. (7) Return line for head end of boom cylinder.
Illustration 4 g00309403
Hydraulic Schematic of Boom Lowering Control Valve (8) Check valve. (9) Pressure relief valve.When the boom pilot control valve is moved to the BOOM LOWER position, pilot oil is sent through line (6) to the boom lowering control valve. The pilot oil shifts control valve (9) . Oil from the head end of the boom cylinders flows through the boom lowering control valves (2) and line (7) to the hydraulic tank.At the same time, main pump oil from the main control valve flows through line (3) to the rod end of the boom cylinders. Relief Operation Of The Cylinder Head End
Illustration 5 g00309403
Hydraulic Schematic of Boom Lowering Control Valve (8) Check valve. (9) Pressure relief valve.When the boom is pushed downward by an outside force the oil pressure in the head end of the cylinder increases. The oil pressure is sensed at relief valve (9) of the boom lowering control valve. When the relief valve opens the oil flows back to the hydraulic tank. Note: The relief valve is set to open at 36300 500 kPa (5265 72.5 psi) .Manual Boom Lower Operation
Illustration 6 g00317607
(10) Locknut. (11) Piston.This function is used to manually lower the boom when the engine is shut down and when no pilot oil pressure is supplied to the pilot circuit for boom lowering.When locknut (10) and piston (11) are loosened, oil flows from the head end of the cylinder to the bleeder valve. The oil flows through the bleeder valve to the rod end of the cylinder. The rod end of the cylinder fills with oil. The excess oil returns to the hydraulic tank.
Illustration 1 g00309329
Boom Cylinder Lines Group (1) Supply line for boom cylinder head end. (2) Boom lowering control valve. (3) Supply line and return line for boom cylinder rod end.
Illustration 2 g00309334
Hydraulic Schematic of Boom Lowering Control Valve (4) Check valve. (5) Port to head end of boom cylinder.When the boom pilot control valve is moved to the BOOM RAISE position pump oil from line (1) flows into the boom lowering control valves (2) . The pump oil passes through check valve (4) and flows into the head end of the boom cylinders.The oil in the rod end of the boom cylinders goes through line (3) , and back to the hydraulic tank through the boom control valve.When the implement control lever is moved to the NEUTRAL position, the boom cylinders are held in the raised position. Check valve (4) prevents the oil in the head end of the boom cylinders from flowing out of the boom cylinders.Boom Lower Operation
Illustration 3 g00309443
Lines Group (Pilot Oil and Boom Cylinders) (2) Boom lowering control valve. (3) Supply line and return line for boom cylinder rod end. (6) Pilot oil supply line. (7) Return line for head end of boom cylinder.
Illustration 4 g00309403
Hydraulic Schematic of Boom Lowering Control Valve (8) Check valve. (9) Pressure relief valve.When the boom pilot control valve is moved to the BOOM LOWER position, pilot oil is sent through line (6) to the boom lowering control valve. The pilot oil shifts control valve (9) . Oil from the head end of the boom cylinders flows through the boom lowering control valves (2) and line (7) to the hydraulic tank.At the same time, main pump oil from the main control valve flows through line (3) to the rod end of the boom cylinders. Relief Operation Of The Cylinder Head End
Illustration 5 g00309403
Hydraulic Schematic of Boom Lowering Control Valve (8) Check valve. (9) Pressure relief valve.When the boom is pushed downward by an outside force the oil pressure in the head end of the cylinder increases. The oil pressure is sensed at relief valve (9) of the boom lowering control valve. When the relief valve opens the oil flows back to the hydraulic tank. Note: The relief valve is set to open at 36300 500 kPa (5265 72.5 psi) .Manual Boom Lower Operation
Illustration 6 g00317607
(10) Locknut. (11) Piston.This function is used to manually lower the boom when the engine is shut down and when no pilot oil pressure is supplied to the pilot circuit for boom lowering.When locknut (10) and piston (11) are loosened, oil flows from the head end of the cylinder to the bleeder valve. The oil flows through the bleeder valve to the rod end of the cylinder. The rod end of the cylinder fills with oil. The excess oil returns to the hydraulic tank.