1996 cat 426b hydraulic pump vibration issue. (With video)

[Alexp08]

Hello, can anyone point me in a direction as to why my hydraulic pump is vibrating out of control?

Link to YouTube is the video. First few seconds are regular speed then it cuts to slow motion for the rest of the video. Thanks.

1996 cat 426b hydraulic pump vibration - YouTube

 

[countrybumpkin]

Looks like the drive flange on the front of the crank is lose, cloud have a couple broken bolts and has turned off center.

 

[MHarryE]

Could you give the machine number prefix? It should be in the form of 8RF or something. You have a 17 digit PIN but the important ones are the last 8. I don't want the last 5 - they identify your machine. There are, however, several 426B's and I can't look up the right service info without the 3 characters/digits that identify which real model and which plant it came from. Your vintage should have a Tier 1 3054 engine, on my machines we ran the hydraulic pump off the engine front gear train (valves, water pump, injection pump and in our case hydraulic pump). For your BHL, however, that gear train is not substantial enough to power the larger higher pressure hydraulic pump so they created an adapter to drive from the crank pulley. I believe the other person is correct - something sheared in there; however, the adapter hub may pilot in the crank pulley so it may have broke something there. I'd like to look through my service info on your particular model.

 

[Alexp08]

I hope it was just a bolt, I'd hate for something yo habe gone wrong with the crankshaft.
I believe the number you're asking for is "6KL"
I appreciate all the help!

 

[skyhook]

You can see from this frame I took, the pulley on the pump is coming away from the other pulley. Look at the difference in spaces. Check for loose or broken bolts and nuts.