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Hazelton, Kansas | Bell,
On my 4720, the plastic sleeve over the drive shaft (between the engine and hydro) warped and threw the shaft out of balance. I cut it off, declaring to myself that the shaft was "guarded by position".
There was a NAT thread on this topic within the last year. I'm not at all sure the 4730 has the same setup. They may have added an intermediate plastic bearing to hold the outer sleeve in alignment.
Also, these engines develop a rumble when an injector hangs up. When that happens, the lights shake at idle. You can locate the bad injector by checking exhaust manifold temps with an IR gun. Methinks you don't have enough hours for that, though.
Regards.
MDS
Edit: I found the previous thread.
http://talk.newagtalk.com/forums/thread-view.asp?tid=405569&posts=4...
Edited by crowbar 4/11/2014 18:21
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4730 vibration and new low rumble ?
