In order to guaranteeing maintenance man safety,it is necessary to build up a platform for checking and maintaining the concrete placing boom on the floor．

1. periodic inspection

1.1 Daily inspection

● Inspect if the electrical control system works normally or not before operating．

● Inspect whether the hydraulic oil level which is 1ower than the half of the oil tank or not，and the hydraulic oi1 is emulsified or not．

● Check if the hydraulic system lines leak。

● Check the direction of rotation of the pump．

● Check if the balance valve which work reliably or not．

1.2 Weekly inspection

● Check whether the connecting bolts，the end clamping plates，pins and 1ock nuts 1ooseness or not.

    ● Check the delivery pipes and change the pipes immediately when the thickness of the pipes is less than 2 millimeters．

    Act as the following to prolong the service life after approximately 6000m³pumped volume：

    Rotate the bends through180°of the delivery line．

    Rotate the all delivery pipes through  120°of the delivery line

    ● Check whether the cotter pins of the railing drop off or not．

1.3  Monthly inspection

● Check whether the slewing limit switch work normally or not．

● Check if the slewing reducer works abnormally．

● Tighten the connecting bolts of the tower section．

● Check the shaft coupling of the motor．

● Check the motor,the insulation resistance of the circuit，the metal shell of the electrical equipment，and the earthed resistance of the metal structure．

● Visual inspection of electrical cable，repair and change it after burn in or breakage．

● Fully check and maintain a11 the parts of the equipment including hydraulic and electrical components．

2. Lubricate

    Pour grease to the mobile pins periodically．