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jdemaris
10-12-2003 17:14:14
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Re: Re: 1971 4020 injector pump rebuild in reply to Jake, 10-12-2003 10:57:10
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I don't entirely agree with your comments on the Roosa Master pumps. 4020 John Deeres were available with two totally different injection pumps, both made by Roosa Master - the model CB and the model DB (a.k.a. JDB). The CB was declared obsolete by Roosa Master back in the early 80s, and as a result, some major parts for it became unavailable. John Deere's answer to the problem was to supply a replacement pump kit. It consisted of a JDB pump and new lines. It wasn't cheap. Some pump shops have used parts available to fix the CBs, but they're getting scarce. The other pump that came as standard equipment, the aforementioned DB, it the one you are commenting on I suppose. I don't find it to be any more complicated, or any simpler than the CAV distributor pumps or the various inlines that are used today on ag. equipment. I suspect it got the repuation as being cheap to fix due to many minor problems it suffered, e.g. transfer pump regulator falling apart, plastic governor weight retaining shattering, pump roller leaf spring breaking, etc. In reality, if something major goes, like the head and rotor, the parts cost almost equal the price of a brand new pump . . . not cheap! I know of a few high-volume pump rebuilders that will sell rebuilt pumps at a set exchange price regardless of what your pump's needs. This is, perhaps, not the greatest deal if the pump you're sending in only has minor problems. On the other hand, if it has major problems, it can be a great deal. One other note on Roosa Master pumps. I pulled the pump off my '87 Chevy Suburban at 420,000 miles (DB pump). It was leaking, but other than that it worked fine. I pulled it apart, found a few "questionably" worn parts and commenced to order a seal kit, metering valve, transfer pump liner and blades, and few other small parts. Ended up, the cost of these minor parts exceeded the cost of an exchange rebuilt and guaranteed pump. So, I reluctantly bought the rebuilt for $395.
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