Excavator arm is weak how to do?

Dig friends know that the big arm in the excavator parts is the place where the whole car produces the most force. No matter what work, "the big arm waved" is naturally not a word!But if something goes wrong with this big thing, it's the most "fatal" breakdown.If you want to keep your big arms healthy, you have to start from the following aspects.
Volvo construction machinery accessories Xiaobian thinks that it is necessary to check whether the pilot pressure of excavator arm rise full stroke or high throttle is about 3MPa.(Measure the pilot pressure of the gear pump of excavator accessories (the measuring position is shown in the figure), connect the plug of measuring pressure at A3, and connect the pressure gauge of 7MPa for testing.)
Check whether the low pressure sensor of the big arm (under the air filter) is faulty. If damaged, please replace it.

Excavator arm
Test whether the secondary pressure of P1 and P2 pump proportional valve of excavator accessories is 1.8-3.0MPa when the full stroke of the big arm is rising and the throttle is high. If not, the proportional valve should be replaced.
When the arm rises full stroke and the throttle is high, check whether the pressure of the relief valve at the arm port is above 32Mpa, check whether there are impurities in the valve core of the excavator accessories and whether the valve seat is abnormal.
Check the safety suction valve for damage (safety suction valve is a more complex spool that protects the tubing and cylinder from damage when subjected to a large impact).
1. The multi-way valve spool (holding valve) of the excavator accessories is damaged, leading to internal pressure relief.
2, big arm relief valve failure, check and replace.
3. The oil seal of the big arm cylinder is damaged. Check and replace it according to the model.
4. The piston of the cylinder is worn, the gap is increased, and the oil channeling in the large cavity and small cavity is increased
Small make up summary
If the arm is unable to drop the arm, the pressure of the above parts should be measured first, checked and simply cleaned.If the fault is still not solved after cleaning and installation, the excavator accessories need to be replaced.