Free Problem Diagnosis Mercedes-Benz C220 1996 Auto Transmission

Content:
Brake bands control function of planetary gear sets. A hydraulic system, pressurized by a primary gear type pump and a secondary piston type pump provide working pressure required to operate friction elements and automatic controls. Reverse Gear In reverse, brake B-3 is applied, one-way converter clutch is locked, and clutch K-2 is engaged.

Both planetary gear sets are involved in gear reduction. Valve body receives inputs from selector lever position, mode selector switch, accelerator pedal position (control pressure), intake manifold vacuum, kickdown function (if activated) and vehicle speed. Primary and secondary pump : Primary pump is housed in front transmission cover and is driven by engine through torque converter. Primary pump operates as long as engine is turning, and supplies pressurized oil to entire hydraulic system. Drive of secondary pump is switched off by cut-off piston, by means of primary pump pressure. Secondary pump : Secondary pump is required only for towing and tow-starting vehicle. Working pressure circuit consists of working pressure control valve, basic pressure control valve, 2 two-way check balls, a modulating pressure relief valve, a one-way valve and restrictor.