DESCRIPTION AND OPERATION TRANSMISSION CASE OIL COOLER LINE PLUGS An integral oil cooler pump system has been developed for MACK T300 series transmissions. The oil cooler is optional for engine ratings under 400 hp and chassis ratings under 80,000 GVW. The oil cooler system is required when the engine rating is equal to or exceeds 400 hp, or the chassis rating is greater than 80,000 GVW. On T313/T318 series transmissions that are not built with oil cooler pump systems, the tube line openings are plugged or capped. The main suction tube area contains a metal plug and the outlet fitting area receives a plastic cap.
MAGNETIC OIL FILTER A magnetic oil filter assembly is built into the right side of the main case. It consists of a magnetic plug which removes ferrous metallic particles from the passing oil. After passing the magnetic plug, the oil is channelled upward to an outlet, where it returns (by gravity) down into the transmission case sump. The magnetic plug is removable from the outside of the transmission, without the necessity of draining the oil since this plug is above the oil level. The drain plug at the bottom of the case is also magnetic. 11
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Figure 10 — Transmission Case Oil Cooler Line Plugs 1. Outlet Plastic Cap
2. Suction Tube Plug Figure 11 — Plug Locations 1. Magnetic Filter Plug 2. Oil Temperature Sensor
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3. Oil Drain Plug 4. Oil Fill and Level Plug
