(Transmission Cooling, Basic Function - GF27.55-P-1000B)
Model All with Transmission 725
Transmission oil cooling circuit
Overview
This document contains information on:
- General
- Function requirements
- Function
General
Transmission oil cooling keeps the Transmission oil temperature constant. This prevents overheating damage to the automatic transmission.
Function requirements
- Primary pump
- Engine in operation
- Electric auxiliary oil pump
- Ignition ON (circuit 15)
Function
The Transmission oil is drawn out of the oil pan by a mechanical primary pump in the automatic Transmission and pumped to the oil thermostat (3) through the feed. The oil thermostat (3) routes the Transmission oil back to the automatic Transmission through the return line at a Transmission oil temperature < 90°C. At a Transmission oil temperature of > 90°C, the oil thermostat (3) opens and the Transmission oil flows through the additional oil cooler (2) and the oil cooler (1) before it flows back through the return line to the automatic transmission. In order to ensure needs-based cooling, the electric auxiliary oil pump is actuated in addition to the primary pump, depending on the situation.