MANIFOLD ASSEM. (R.H.) 3N8363 - Caterpillar

Illustration 1 g06038525
Transmission Oil Pump
Illustration 2 g00878614
Components of the Oil Pump
(1) Cover assembly
(2) Body assembly
(3) Manifold assembly
(4) Gear
(5) Gear assemblyThe transmission oil pump is a single-section gear type. The transmission oil pump is mounted on the back of the hydraulic implement pump.The main components of the transmission oil pump are body assembly (2), cover assembly (1), gear assembly (5), gear (4), and manifold assembly (3).Drive gear (4) is connected by splines to the hydraulic implement pump, which is driven by the pump drive.When the pump is operating, oil comes from the reservoir in the output transfer gear case. After leaving the gear case, the oil goes through the magnetic screen. The oil then enters the pump through an opening in manifold assembly (3). The oil goes to the lower part of the body (2). The oil fills the spaces between the teeth of gears (4) and (5). As the gears turn, oil is pushed from body (2). The oil goes through another passage in manifold assembly (3) to an oil line. The oil then goes to the filter.When the engine is not running, air is present in the pump. When the engine is started, a line on the outlet side of the pump allows the air to leave the pump. This action prevents air from getting into the system. After all air is out of the pump, an orifice in the line allows a specific amount of oil to flow to the torque converter case. This oil is used to lubricate the components of the pump drive.