He says the correct gear # I need is part #7N8955 which changes to #2W7680, and the plate/cover part number is #4N3853. The part number on this gear I found is 7WO140 which is the gear on the air compressor, and the 4 bolt plate that bolts to the gear is part # 7W5516, it's a flat plate with the female splines.Īccording to the Cat parts man, that gear won't work off the B engine/compressor. Recently I removed the drive gear (and that adapter plate that bolts to it) off of another 3406B and thought I struck gold, but according to the Cat dealer I deal with, that drive gear that attaches to the 3406B air compressor is not what I'm looking for because the 3406A engine has an idler gear supposedly in the accessory drive train with the splines in it for the pump drive.? That said, I never got a visual on what/how the Vickers pump goes into that one to get driven from the front view. I replaced the air compressor, (It has existing power steering BTW.) The drive gear on the compressor is a cone-shaped one, and all I did was R&R it off the old and onto the new compressor.no messing with the pump drive at all. It's been 2 years since I had my eyes and hands on this same stuff, when I restored my other 1978 KW rollback truck. There needs to be a splined plate in there to accept the pump drive splines. I removed the 2 bolt plate and looked in there and found a blank plate. Research has told me that I need to find the gear that drives the pump, because this current engine doesn't have it. I have a nice, fairly new Vickers pump that I personally removed from a 3406B engine and kept it for future use. This A model Cat has a 2 bolt plate on the front of the accessory drive that is the place where a power steering pump would usually mount. So now another question for those seasoned Cat men here on the subject of Vickers power steering pumps, moreso on what I need to drive it. For now, I'm going to boost this 3406A with a turbo and a little more fuel to spin it and just deal with it. That's not my plan to rebuild a B and invest all that when the real plan is to buy a crate C motor in another year or thereabouts. Well, I passed on that 3406B due to the amount of work it'd take to make it a 400. Is there a site I can go to that I can punch that serial number in and see what that thing is, or do I have to call Cat in the morning and talk to them? I'd like to find out ASAP, before I have to commit to buying this thing and finding out it's a 310 or 350HP, and not able to get 400 or so out of it without spending crazy money on injectors, etc. The aluminum tag on the valve cover's long gone, but the casting is on the turbo side of the engine is as follows: 7FB 59727 He claims it is a "detuned" 3406B, around 350 or so according to his Cat man that worked for Cat for years, off the serial number.
It's tough going by what somebody selling something is telling you.
I came along and lo & behold, I needed one anyway.
Turned out he didn't use it because of different bell housing and other issues that wouldn't work for him, so he's listed it for sale. I am about 48 hours away from buying a used (85-86) 3406B Cat engine, one that's out of an old Autocar and the guy that's selling it to me was going to use it for a different application in a soil aerating machine.
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