LUYU's self loading concrete mixer trucks sell well all over the world, and the production line of mixer trucks is very busy every month at present. Our business sales have received numerous favorable comments when dealing with customers' after-sale problems. In order to ensure the customer's experience, LUYU has compiled a list of common self loading concrete mixer truck troubleshooting methods, hoping to help you.

The oil pump is abnormal

1.Check the hydraulic oil level. From the oil level gauge on the tank or reducer, check for lack of oil.
2. Check whether the oil becomes dirty, check the negative pressure gauge pointer, if the pressure gauge reading is greater than 0. 3Mpa, please replace the hydraulic oil and filter element immediately.
3. Check whether there is air in the system. Hold the high-pressure tubing in your hand to detect intermittent shaking. Tremors must be abandoned.
4. Check the quality of hydraulic oil. Unscrew the oil screw plug to check the oil product, whether the oil is spoiled or emulsified.
5. Check whether there is any leftover material agglomeration in the cylinder body and carry out clear treatment.
6. Check whether the oil pump oil replenishment valve is blocked and clean it up.
7. The oil pump is empty, the oil suction filter is blocked, and the oil filter is cleaned or replaced.

There are impurities such as iron filings in the oil pump, which can be cleaned or overhauled.

The reducer is abnormal
1. Check the oil level of the reducer. Oil level gauge from the reducer. Check for lack of oil.
2. Check whether the reducer oil is deteriorated, and if it deteriorates, it is replaced.
3. Check whether there is a lack of butter at the connecting flange of the reducer, such as lack of oil and filling butter.
4. Check whether the reducer bearing is damaged, and the abnormal sound is intermittent.
5. Check whether the bolt between the connecting flange and the cylinder is loose.
6, serious wear, maintenance.

Oil leakage in the oil circuit system
1. Check whether the pipeline sealing ring is damaged.
2. Oil leakage at the threaded connection, check whether it is loose, and tighten it.
3. Oil leakage at the eccentric shaft of the oil pump, check whether the limit bolt is loose.
4. Control valve oil leakage, check whether the fixing bolt is loose.
5. Oil pump oil seal oil leakage, replace. The replacement steps are as follows:
(1) Unscrew the oil pump connection flange to tighten the bolt and remove the washer.
(2) Remove the connecting flange with a three-prong pull horse.
(3) Remove the circlip.
(4) Remove the oil pump oil seal placement.
(5) Clean the oil pump oil seal placement.
(6) After lubricating the inner and outer rings of the new oil seal with oil or grease, load them.
(7) Load the circlip.
(8) Turn the output shaft of the oil pump and carry out the closing.

The drive shaft is abnormal
1. Check whether the flange connection bolts at both ends of the transmission shaft are loose and must be tightened.
2. Check whether the spline and universal joint pumping are lacking grease lubrication.
3. Check whether the cross bearing is damaged, replaced or overhauled.
4. Check whether the spline connection part is seriously worn.

The radiator fan motor does not spin
1. measure the oil temperature, whether it is higher than 65 °C.
2. Check whether the heat dissipation circuit line connection is good.
3. Check whether the heat dissipation circuit insurance is intact.
4. Check whether the heat dissipation circuit relay is intact.
5. Check whether the temperature control switch is intact (check the resistance at both ends of the temperature control switch, and the temperature control switch is normally open)

The mixing tank cannot be turned
1. Insufficient oil supply to the diesel engine causes insufficient output power. Replace the diesel filter, overhaul the tubing, check that there is enough diesel in the diesel tank, and check whether the diesel tank suction joint is leaking.
2. Dirty hydraulic oil, leakage or damping hole in the manual servo valve, insufficient pressure of hydraulic pump, leakage of hydraulic motor. Replace hydraulic oil, clean hydraulic tank, hydraulic pump, hydraulic motor, replace seals.
3. The internal pin shaft or feedback stem of the manual servo valve is cut, the hydraulic pipeline is damaged, and the operation fails. If the concrete has been loaded into the mixing tank and the fault cannot be immediately eliminated, the human hole of the mixing tank should be opened immediately, the concrete should be removed from the outside of the tank with a tool, and the concrete should be flushed with high-pressure water at the same time so that the concrete will not solidify in the mixing tank; or the emergency oil pipe should be connected to the hydraulic oil pump of another vehicle of the same type and the hydraulic motor of the faulty car to form a temporary circuit to drive the mixing tank to unload the concrete.
4. When the engine or plunger pump fails, the motor or reducer can be used normally.
Connect the emergency drive hose (the two pumps and motors are the same) and rely on the power of other mixer trucks to drive the mixer to rotate and drain the concrete. However, this method cannot be used when the motor or reducer fails.
The specific steps are as follows:
(1) Prepare the three emergency drive hoses and remove the nozzle and joint cover.
(2) Operation of faulty cars (driven vehicles).
a. Turn off the engine of the faulty car; Loosen the fastening nut (one on each side) towards the left;
b. Rotate the knob to the right again until it can no longer be rotated;
c. Remove the high-pressure hose from the motor joint;
d. Connect the emergency drive hose to the motor connector;
e. Connect the nozzle on the emergency drive hose with the high-pressure hose unloaded by the faulty car to prevent oil leakage.
(3) Operation of rescue vehicle (drive vehicle).
a. Put the operating handle to the neutral position;
b. Turn off the engine;
c. Remove the high pressure hose from the high pressure tubing;
d. Connect the emergency drive hose to the high pressure tubing;
e. Cover the high-pressure hose of the drive vehicle with the joint cover on the emergency drive hose to prevent oil leakage.
(4) Start the engine of the rescue vehicle.
(5) Pull the operating handle of the rescue vehicle to the "discharge" position so that the concrete in the faulty car is discharged.
After the emergency drive is completed, the two vehicles are restored to their original state. Note: Emergency drive hoses need to be ordered separately.
5. When the motor or reducer fails
Open the hole cover of the mixer manhole and pull the concrete out of the mixer manhole as soon as possible.