MK111 relay not working properly at first cycle

I have weird problem with MK111 pulse timer which is used for lubrication system with solenoid pump.
Anyway when I turn circut on relay is switched into closed position and stays on untill I shake or hit it it and after that everything is working normal. This appears only at first cycle.
Because I have 3 MK111 kits I tried to change relay with new one but nothing has changed.

What is the problem?



We are not familiar with this problem, which has never been reported before.
Check the complete assembly for mechanical problems.
Are you sure the unit gets 12VDC. If it gets less, the relay might not attract properly.