PLUG 4646179 - Caterpillar

Illustration 1 g01370119
(1) Inlet from the fan motor (2) Outlet to the hydraulic tank (3) Location of the Override solenoid valve (4) Pilot oil outlet to the hydrostatic pumps (5) Location of the parking brake solenoid valve (6) Passages to the parking brakes (7) Outlet to the bearing of the hydrostatic motors (8) Inlet from the case drain of the back hydrostatic pump (9) Inlet from the case drain of the front hydrostatic pump (10) Inlet from the case drain of the hydrostatic motors (11) Outlet to the hydraulic oil cooler (12) Inlet from the hydraulic oil cooler (13) Plug assembly for the hydraulic oil flow to the cooler (14) Plug assembly for the hydraulic oil flow (15) Poppet (16) Poppet (17) Spring (18) Spring (19) Inlet from the case drain of the hydrostatic motors (20) Passages from the parking brakes (21) Pilot oil outlet to the hydrostatic pumps (22) Cold oil flow (23) Hot oil flow The hydraulic block is used to distribute all the return oil from the case drains of the pumps and motors in the power train system. The system is divided into four systems. The components are the oil cooler system, the brake system, the drive system, and the hydraulic tank. The oil cooler bypass valve maintains the hydraulic oil at the optimum operating temperature. For SAE 10W hydraulic oil, the oil cooler bypass valve maintains an operating temperature of 60 °C (140 °F). The oil flows from case drains of the pumps and motors to either the oil cooler or the hydraulic tank. When