INSULATION AS 3081811 - Caterpillar

Schematic of Main Hydraulic System
Illustration 1 g00920161
Hydraulic schematic (1) Left swing motor (2) Right swing motor (3) Left travel motor (4) Right travel motor (5) Boom cylinder (6) Boom lowering control valve (7) Stick cylinder (8) Left travel brake valve (9) Right travel brake valve (10) Bucket cylinder (11) SmartBoom valve (12) Boom load pressure switch (13) Swivel (14) Main control valve (15) Pressure switch (implement or swing) (16) Travel pressure switch (17) Travel pilot control valve (18) Main relief valve (19) Pilot control valve (swing or stick) (20) Accumulator (21) Pilot filter (22) Pressure sensor (23) Hydraulic activation control valve (24) Drain filter (25) Slow return check valve (26) Bypass check valve (27) Oil cooler (28) Return filter (29) Pilot oil manifold (30) Pilot control valve (boom or bucket) (31) Upper pump (32) Solenoid valve (fine control) (33) Solenoid valve (travel speed) (34) Solenoid valve (swing) (35) Lower pump (36) Radiator (37) Proportional reducing valve (38) Pilot relief valve (39) Cooling pump (40) Cooling pump relief valve (41) Fan motor (42) Hydraulic tank (43) Pilot pump Hydraulic Pump Flow
Introduction
Illustration 2 g00920302
Pump compartment (31) Upper pump (35) Lower pump (45) Housing (46) Outlet line (upper pump) (47) Outlet line (lower pump)This machine is driven and controlled by the following systems:
The main hydraulic system supplies oil to the cylinders and motors of the machine.
The pilot hydraulic system supplies oil to the control circuits.
The electronic control system controls the output from the engine and the pump.
The cooling system supplies oil from the cooling pump to the fan motor. The fan creates an air flow in order to cool the hydraulic oil and the coolant.The main hydraulic system oil is supplied by upper pump (31) and lower pump (35). The upper pump and the lower pump are variable displacement piston pumps that are identical in performance. Lower pump (35) is directly connected to the engine by a flexible coupling. The upper pump and the lower pump are mechanically connected in parallel through gears. Gear type pilot pump (43) supplies oil to the pilot hydraulic system. The pilot pump is directly connected to the lower pump by a gear. All engine output is used to drive these three pumps.Each of the main pumps delivers approximately 360 L/min (95 US gpm) of hydraulic oil at no load. The pilot pump delivers approximately 41 L/min (10.85 US gpm) of hydraulic oil at no load. When a load is placed on the machine, the hydraulic oil is supplied to the main hydraulic circuit.When the load increases, the main pumps increase the delivery pressure and the pumps decrease the flow rate. The system maintains constant hydraulic horsepower. The engine is maintained at the full available horsepower.The hydraulic oil of the cooling system is supplied by cooling pump (39). The cooling pump is a fixed displacement piston pump. Fan motor (41) rotates at high speed. High cooling capacity results because of the delivery pressure of the cooling pump.
Illustration 3 g00920305
Main control valve compartment (18) Main relief valve (48) Right