What’re the trial run of segmented assembly bridge girder launcher?
After finishing installing the bridge girder launcher, make a comprehensive check: A. Check whether connection parts are tight B. Check whether electric connection is right and 
whether limit switch is reliable C. Check whether each part for hydraulic system has a oil leakage phenomenon and a good lifting function D. Check whether the mechanical and structural parts work well E. Check whether rotating parts have a good lubrication F. Check whether oil level in oil tank can meet the demand and start a test run of hydraulic system: ① Infuse 32# (old brand 20#) hydraulic oil to oil tank through pouring orifice ② Do not mix together hydraulic oil with different mark and different category, according to the weather, the hydraulic oil brand can be changed. Filter hydraulic oil once half a year, replace it every two years ③Infuse certain oil to pump through oil drainage orifice of oil pump on fuel tank cap ④Completely loosen relief valve and plug in, start oil pump, run with empty load for 5-10 minutes to check whether oil pump rotation direction is correct, monitor whether oil pump is noisy ⑤Turn hand-operated direction valve and screw properly relief valve to make hydraulic cylinder begin to start, then keep cylinder stretch out and draw back 4-5 times in whole trip to remove air in the system, because the normal phenomenon is: after finishing installing the bridge girder launcher first time, air in hydraulic cylinder may sometimes make cylinder not move or move slowly, while the oil pump has run a long time. It should be avoided to adjust direction valve repeatedly. (that can not remove the air in the hydraulic cylinder) ⑥When control hand-operated direction valve to change direction, the force can not be too fast and too sudden. When change positive movement to counter movement, stop for a minute in the central place to avoid hydraulic shocks
