Tensioner car 2.4 Excessive residual pressure The residual pressure is too large to disable the brake. The main reason is that the distance between the baffles on the control rod of the electro-hydraulic pressure regulator is too small; the orifice of the relief valve is too large. Treatment: adjust or replace the control rod on the baffle; replace the safety valve hole with a smaller diameter orifice.

2.5 two-stage brake oil pressure value pressure retention performance failure of the second brake oil pressure value is caused by pressure failure: the oil block on the large relief valve inside the dirt, so that the hydraulic tensioner spool is not tight; throttle valve opening is too large, discharging a large amount of oil; solenoid reversing valve inside the dirt, internal leakage is too large. For this type of failure, you can first remove the spool to clean, remove the dirt, put the spool in the appropriate position, and then adjust the one-way throttle valve so that the opening is as small as possible to play the role of throttling and supplement.