Many people hear the abnormal sound of concrete mixer in the process of operation will not pay attention to it, which falls into a wrong area, often cause damage to mechanical equipment, so the sound of concrete mixer should pay attention to it!
Concrete mixer suddenly start the engine at low speed with speed, on cylinder body ministries send out the voice of “MAO MAO MAO MAO”， this is due to the large clearance between the piston pin and connecting rod bushing, or take the piston pin.
When the concrete mixer starts running at high speed, it will make a dull “crack, crack” sound, especially when the throttle suddenly decreases for a few hours, which is caused by the excessive axial clearance of the throttle.
When hearing the full length of the cylinder issued a rumbling, dull “empty thunk, empty thunk” knock sound, open the refueling cover, found that there are bubbles （indicating a leak）， this is the piston and cylinder. Because the sleeve clearance is too large.
If the same part of the crankshaft direction slightly hear the sound of “quack, quack, quack”， it is the vibration caused by the twist of the connecting rod when working. The latter two sounds are more pronounced when the speed changes. It is easy to distinguish; There is similar to the sound of a small hammer hitting the upper and lower iron blocks of the cylinder, the diesel engine exhaust pipe smoke blue （accompanied by burning oil phenomenon）， with a long handle screwdriver gently touch the cylinder if it is easy to hear in the body, you can judge that the piston ring side clearance is too large or ring fracture.
Diesel engine suddenly change the load, near the crankcase （from the middle of the cylinder block to the bottom） can clearly hear the rapid “empty, empty, empty” dull knocking sound, and with the increase of load or speed and rapid change, the voice increases, open the refueling cover can hear more clearly, no load is not obvious. This is because the connecting rod bushing wear is too large, resulting in connecting rod bushing and crankshaft connecting rod journal clearance is too large.
So you should know something about it. If you have any questions, you are welcome to come to our website www.zkhntjbj.com for consultation.