I. Pay Attention to the Connection Between the Pump Truck Superstructure and Chassis
1. Check the connection between the front and rear axles and the transfer case of the chassis. Inspect the looseness
of the connecting flanges and check the fixing bolts of the transfer case.
2. Check the stability of some connecting bolts and seals.
3. Check for cracks in the boom support seat, focusing on the slewing bearing and the integrity of the slewing gear.
4. Check the wear of each connecting pin to prevent excessive clearance from causing cracks at the connection.
II. Regularly Check the Tightness of Connecting Parts
1. Regularly check whether connecting bolts, set screws, nuts, pins, and other connecting parts are loose. If loose,
tighten them with a torque wrench according to the torque provided in the table below.
2. Pay special attention to the fact that the bolts of the slewing bearing bear a huge alternating load. Therefore,
the original preload torque will be lost after every few hours of operation. The preload torque of the bolts must
be checked regularly with a torque wrench. The boom must be placed on the support to check the preload torque
to eliminate the axial force on the slewing bearing. Generally, new boom-type pump trucks must be inspected
after 100 working hours, and then every 500 hours thereafter.
3. When tightening bolts, there should be no pre-tension stress on the bolts. Therefore, the boom must be folded
and closed, and kept in a vertical position. When tightening the bolts on the slewing platform one by one, be sure
to lock the nuts completely. It is important to emphasize that high-strength bolts removed for structural repairs and
connecting bolts damaged due to fatigue, etc., cannot be reused. New connecting bolts of the same grade should
be used during reassembly.