Basic Fault Diagnosis and Treatment of Pump Truck Accumulator

Accumulatorproblems can be identified by observing whether the swing cylinder or S-cylinder valve changes quickly or slowly. Under normal circumstances, the S-cylinder valve change is instantaneous; if the change is slow or the swing cylinder lacks strength, it is often related to the accumulator.

Check the pressure drop on the change-over pressure gauge: before and after operation, a differential of 5-7 Mpa is normal. If the differential is less than 5 Mpa, the accumulator is not storing energy, and the air pressure in the accumulator bladder should be inspected next.

You can press the charging valve of the accumulator with a sharp object. If it opens easily or no air sound is heard after opening, the accumulator pressure is insufficient. There are two possibilities: the bladder is leaking air out through the valve, or the bladder is damaged and air is leaking internally. To check whether it is internal or external leakage, simply fill the bladder with air; if the pressure stays stable for a long time, it is external leakage. If the pressure drops quickly, the bladder is likely damaged and needs to be replaced.

Notes for replacing bladder-type accumulatorbladders:

1. Before disassembling or assembling the accumulator, release the distribution pressure and the air pressure in the bladder.

2. Before installing the accumulator, clean the inside of the accumulator and the bladder with gear oil, and do not wear gloves during the entire installation process