The stable operation of heavy duty mining truck is beneficial to safe production of mines. The failure rate of heavy duty mining truck in a mine is high and it is even higher in winter. It is found through analysis that the main causes are structural designs of accumulator and steering pump themselves for hydraulic system are not reasonable as well as control of mixture ratio of fuel to oil for engine is not accurate. The seal wear is reduced through changing single-point support to oriented multi-point support for piston of accumulator and adding unload groove; such problems as high pressure and temperature rise are solved as well as loss of parts is reduced through adding unloading valve on steering pump; temperatures of solidification point for different mixing ratios of 0^# and -35^# diesel are determined through experiments as well as auxiliary fuel tank is installed to choose different mixture ratios of fuel to oil and oil supply modes based on weather conditions. The failure rate of heavy duty mining truck is reduced through implementing the above measures.

heavy duty mining truck  /  technical transformation  /  hydraulic system  /  piston of accumulator  /  steering pump  /  solidification point