What are the reasons why the Mercedes-Benz A200L cannot move when shifted to D gear?
1 Answers
The reasons why the Mercedes-Benz A200L cannot move when shifted to D gear include loosening of the linkage between the control handle and the manual valve rocker arm; clogging of the oil pump inlet filter screen; severe leakage of the main oil circuit; and damage to the oil pump. Loosening of the linkage between the control handle and the manual valve rocker arm: Check whether the linkage or cable between the automatic transmission control handle and the manual valve rocker arm is loose. If it is loose, it should be reinstalled and the position of the control handle should be readjusted. Clogging of the oil pump inlet filter screen: If only a small amount of hydraulic oil flows out from the main oil circuit side pressure hole, and the oil pressure is very low or basically non-existent, open the oil pan and check whether the oil pump inlet filter screen is clogged. If it is not clogged, it indicates that the oil pump is damaged or there is severe leakage in the main oil circuit, and the automatic transmission should be disassembled for inspection. Severe leakage of the main oil circuit: Remove the plug from the main oil circuit pressure test hole, start the engine, shift the control handle to the forward or reverse gear position, and check whether hydraulic oil flows out from the pressure test hole. Damage to the oil pump: If there is a certain oil pressure in the main oil circuit when starting the engine cold, but the oil pressure drops significantly after the engine warms up, it indicates that the oil pump is excessively worn and should be replaced.