Idler tensioner pulley banging
I have a problem with my idler tensioner pulley bangs against the hydraulic pulley on the hydraulic pump when cold just started doing this . It bangs against the pump pulley for about 1/2 A minute and then every thing is normal till the next cold start I removed the belt and turn the pulley on the tensioner it spins freely both ways and it seems to have plenty of tension I turn the pulley on the pump it turn free and smoothly turning clockwise if I turn it counter clockwise it turns with a jumping movement not a roughness like a bad bearing but in a jump free jump free there is no end play and it is not noisy is this the way the pump is designed the tensioner was change three years ago has about 21000 miles on it.
The first time it happened it bang so hard at start up I figured it had dropped a valve or a rod but by the time I got to the back it had stop the next time again at cold start I had time to get to the back I could see the tensioner going back and forth hitting the pump pulley and then stop then the tensioner works perfect and every time I restart it runs as smooth as can be. This has happened two morning in a row the rest of the day the best.
My first thought is to change the tensioner but wondering if the jumping is normal for the pump. It's not a binding movement making me think it's normal
Topic: Idler tensioner pulley banging