Second, electric stacker vacuum booster system failure should be judged and excluded the following method

1, electric stacker vacuum check
(A) manually checked: Remove Electric Stacker vacuum tube fittings, vacuum tube with your fingers to block interface, start the engine, if the finger is sucked, then vacuum well; if suction is weak, then the pump is faulty, shall overhaul.
(2) vacuum gauge testing: the vacuum gauge connected to the vacuum tube, start electric stacker engine, regardless of the electric pallet trucks at any speed, which shall not be less than 500mm vacuum mercury column, or should repair or replace the pump.
2, electric stacker vacuum booster check
(1) After examining the first hearing, which starts Electric Stacker engine stalling after a few minutes, depress the brake pedal several times, each can hear the vacuum booster issued a "hiss, hiss" sound, if this kind of loud, and with the increase in the number stampede gradually weakened, then almost certainly the vacuum booster good performance.
(2) Start the engine, one step on the brake pedal and hold it so that the control valve vacuum valve and air valve while closing, the brake is in equilibrium (this time with a wisp of cotton on electric stacker vacuum booster The air filter mouth, there should be no suction phenomenon); another person remove electric stacker power cylinder rear chamber air tube and quickly fingers were blocked after the air nozzle and cavity fittings, if there is suction nozzle , indicating that the vacuum valve does not seal, you should repair or replacement; if the joint has suction, then the power cylinder coating is damaged, must be replaced.
(3) Start Electric Stacker engine, do not step on the brake pedal, the wisp of cotton on the control valve air filter mouth, such as cotton yarn is sucked it indicates that the air valve leak, must be overhauled control valves, replace plastic ring or air valve.
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