Here's how to decode the SN: STM = Sitemaster T4 = Turbo with 4WD 068 = build date, June of 1988 337350 = build number (also simply called serial number) 7 = centermount backhoe ("centermounts" are for the US market mostly, in England most are sideshift (these machines are made in Britain by the way) There are lots of people selling JCB manuals on ebay, I just bought a few myself (I just bought an 85 3C1550 a few weeks ago, similar to your machine). The Sitemaster is the same thing as a 1400B except it has the extendahoe and can dig deeper (18'3" vs 14'5"). The Sitemaster is 1000lbs heavier because of the hoe, but there are a few very minor variations other than that, otherwise it's the same. The 1550B is also nearly identical to the 1400B and sitemaster, except its standard hoe goes to 15'11". There's also the 1600B and the 1700B which have more powerful engines than the previously mentioned models, but again the basic tractor is the same unit. If you have more questions, there's a UK guy here named AJK who's an absolute JCB expert. I'm real new to them and trying to learn as much as I can, but would be glad to help if I can, just ask - good luck.
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