If the oil leakage still cannot be eliminated, pull out the shock absorber rod. If you feel stuck or the weight is different, further check whether the clearance between the piston and the cylinder barrel is too large, whether the piston connecting rod of the shock absorber is bent, and whether the surface of the piston connecting rod and the cylinder barrel are scratched or pulled
If there is no oil leakage in the keel electric butterfly valve, check whether the connecting pin, connecting rod, connecting hole, bushing, etc. of the keel electric butterfly valve are damaged, desoldered, cracked or fallen off