Maintenance Specifications for Pump Truck Boom

1. Routine Visual Inspection Items

1. Inspect connections between front/rear axles of the chassis and transfer case: check for loose connecting flanges and fastening bolts of the transfer case.

2. Verify the fastening condition of all connecting bolts and sealing components.

3. Check boom support bases for cracks; focus on slewing bearings and the integrity of slewing gears.

4. Measure wear of all connecting hinge pins to avoid excessive clearance that triggers cracking at joint positions.

   
   

2. Periodic Bolt Tightening Maintenance

1. Regularly check connecting bolts, set screws, nuts and hinge pins for looseness. Retighten loose fasteners with a torque wrench in accordance with specified torque values.

2. Bolts on slewing bearings bear heavy alternating loads, which will cause gradual loss of pre-tightening torque after running hours. Pre-torque inspection must be implemented periodically with a torque wrench. To eliminate axial load on slewing bearings during inspection, rest the boom fully on supporting stands. For brand-new pump trucks, complete the first inspection after 100 working hours, followed by routine inspection every 500 working hours thereafter.

3. Fold and retract the boom and fix it upright before tightening to eliminate pre-tensile stress on bolts. Lock all lock nuts one by one while tightening bolts on the slewing platform. Note that high-strength bolts removed for structural repair and bolts damaged from fatigue are non-reusable; replace them with new bolts of identical grade during reassembly.

3. Structural Crack Inspection & Repair Requirements

1. Boom, outriggers, undercarriage supports and other structural components sustain variable dynamic loads during operation. Stress concentration, rust corrosion and metal fatigue may induce structural cracks after long service. Conduct weld flaw detection on boom and related structural parts every 300 working hours.

2. All cracks on pump truck structural components are repairable; faults shall be detected and fixed at the earliest opportunity. Load-bearing parts such as booms and outriggers are made of high-strength steel. Unauthorized patch welding or drilling is forbidden, as such operations will reduce structural strength. Deliver the vehicle to professional maintenance shops immediately once cracks appear.