... drive type: 4x2,4x4,6x4, 6x6, 8x4, 4*2, 6*4, 8*4, 6*6, 4*43. concrete mixer truck hand drive type: left hand drive ... , right hand drive 4. Ensure the hydraulic oil clean. When concrete mixing ... .Need to replace the Hydraulic oil according to the user manual regularly.Once the inspection found when the hydraulic oil mixed ...