XCMG QAY220, Operation Manual, Page: 154 / 172

QAY220 All Terrain Crane Operation Manual
10-4
Inspection item
Brake:
1. Braking performance.
2. Lubrication.
Rotary Joint:
Electrical conductivity between carbon brush and slip ring.
Speed reducer and swing bearing:
1. Oil level and contamination.
2. Cracks, deformations and oil leakage of gearbox.
3. Abnormal noise and vibration.
4. Loose installation.
5. Hydraulic motor operating pressure.
6. Loose and leaking piping joints.
Elevating cylinder:
1. Wear and damage of pivot pins.
2. Tightness of bolts for pivot pin retaining plate.
3. Leakage.
4. Vibration and noise.
5. Erratic cylinder retraction during load lifting.
6. Deterioration, twisting and deformation of hoses.
Counterbalance valve:
1. Leakage.
2. Pulsation.
3. Loose and leaking piping joints.
Boom:
1. Cracks, deformation and damage
2. Tightness of bolts for boom pivot pin retaining plate.
3. Scratches on sliding surfaces.
4. Wear and damage of pivot pin bosses.
5. Lubrication of sliding surfaces.
6. Deformations and cracks of boom rest.
7. Cracks and bend of boom pin and boom position bolt.
Telescoping cylinders:
1. Movement condition, pulsation, and noise.
2. Operational sequence.
3. Leakage.
4. Function of counterbalance valve.
Slewing system
Boom elevating
system
Boom
telescoping
system
Periodic inspections
Chapter 10
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