THERMOSTAT (Reference) 615005B002 - Caterpillar

Illustration 2 g00925563
Location of the components at the rear of the machine (1) Saw motor valve (3) Saw activation valve (7) Load sensing valve (8) High pressure cutoff (9) Saw pump (12) Implement control valveThe cutoff system is controlled by saw pump (9), saw motor valve (1), and saw motor (5). The saw pump is mounted on the pump drive that is attached to the engine.Saw pump (9) supplies hydraulic oil to saw motor valve (1) and saw motor (5). Saw pump (9) is a variable displacement axial piston pump. Saw motor (5) is a variable displacement bent axis motor.ReferenceFor more information on the saw pump, refer to Systems Operation/Testing and Adjusting, "Piston Pump (Saw)" for the machine that is being serviced.ReferenceFor more information on the saw motor, refer to Specifications, Systems Operation, Testing and Adjusting, "General Information" for the felling head that is being serviced.ReferenceFor more information on the cutoff system, refer to Specifications, Systems Operation, Testing and Adjusting, RENR4370, "Cutoff System".Saw pump and Saw Motor in Standby Condition
Illustration 3 g00927736
Saw pump and saw motor (1) Saw motor valve (2) Bypass valve (saw pump) (3) Saw activation valve (4) Bypass valve (saw motor) (5) Saw motor (7) Load sensing valve (8) High pressure cutoff valve (9) Saw pump (10) Makeup valve (11) Displacement control valveThe Illustration 3 shows the major components of the saw pump and the saw motor in STANDBY condition. The saw pump is moved to the maximum displacement position by spring force. When the engine is running, bypass valve (2) is open to the hydraulic tank in order to keep the pump at maximum output.When the switch for the saw is not activated, saw activation valve (3) is in the OFF position. The spring chamber on bypass valve (2) drains through saw activation valve (3). Saw activation valve (3) blocks the flow of oil from the spring chamber of bypass valve (4). Spring force and pressure from saw pump (9) closes bypass valve (4). Bypass valve (2) opens in order to direct the flow of oil from saw pump (9) to the oil cooler and the return filter. Then, the oil flows to the hydraulic tank. No pump flow goes to saw motor (5) .Saw Pump and Saw Motor (Start-up and Running Position)
Illustration 4 g00927742
Saw pump and saw motor (1) Saw motor valve (2) Bypass valve (saw pump) (3) Saw activation valve (4) Bypass valve (saw motor) (5) Saw motor (7) Load sensing valve (8) High pressure cutoff valve (9) Saw pump (10) Makeup valve (11) Displacement control valveWhen the switch for the saw is pressed, an electrical signal energizes saw activation valve (3). Saw activation valve (3) blocks the oil flow from the spring chamber on bypass valve (2). The spring chamber on bypass valve (4) drains to the hydraulic tank. Bypass valve (2) closes and bypass valve (4) opens. This causes oil to flow from saw pump (9) through saw motor valve (1) to saw motor (5) .A signal pressure that is equal to the