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Author
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Topic: JCB 3 /Super major skid
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Roadless63
True Blue Posts: 22
From: England
Registered: Mar 2007
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posted April 18, 2007 00:29
   
Sorry for so many messages in one go! At work we are rebuilding an early JCB3 based on a super major skid unit it has a mechanical industrial spec pump fitted but no obvious location for tacho drive, where the 90degree output drive would normally go is blanked off and looks to have been so for some years, also the industrial pump is a bit more bulky so routing the drive cable past looks tricky, however there is no drive off the back of the pump either similar to the minimec style. Any ideas? It has disc brakes but no diff lock or transmission brake, and the mainframe which sits on the skid was arc welded together not the prettiest of sights by todays welding standards! Its nice for a company to spend a bit of time and effort on its history quite rare these days I imagine!IP: Logged |
Brian
Rules All Things Blue Posts: 2824
From: United Kingdom
Registered: Feb 2002
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posted April 18, 2007 08:15
The engine you have fitted may be a replacement unit from another industrial application. As far as I know, the pump on the JCB was a normal agricultural style unit but you seem to have a rear mounted governor that was more commonly used on combines or stationary applications like compressors or generators. These need a constant power rather than the variable power found in loader or tractor applications. ------------------
Kind regards
Brian IP: Logged |
W 8H
True Blue Posts: 49
From: Essex UK
Registered: Dec 2005
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posted April 18, 2007 23:15
I am not sure whether or not Brian would agree but the major struggled a bit underneath heavy loaders/diggers. Pushed on the road they could get hot. Alternative engine very likely.
JCB appeared not to fit diff locks to any of the 3Cs and even later the 3CX. I have always assumed that this was to avoid abuse and warranty claims?? Any one got any ideas?
If any one is interested in a fairly complete Major skid 3C our neighbour has one in the nettles. (No financial interest for me).
PeterIP: Logged |
Brian
Rules All Things Blue Posts: 2824
From: United Kingdom
Registered: Feb 2002
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posted April 19, 2007 09:07
Take it from me Peter, I'm not hauling that anywhere on Rover and Gwynnith!The Major struggled with the load both running and stopping. But it seemed that the 4/65 Nuffield that they were built on later coped better. ------------------
Kind regards
Brian IP: Logged |
Roadless63
True Blue Posts: 22
From: England
Registered: Mar 2007
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posted April 20, 2007 00:18
The two governor types are max/min and all speed I always get the two mixed around one is designed so you can set the hand throttle and the governor will keep the revs constant regardless of engine load (ie tractors etc) the other requires movement of the throttle to fuel up the pump when load comes on(lorries etc). We are pretty sure from dating castings etc this m/c is late 61/early62 so would have had the pneumatic governor if agricultural but I believe a mechanical pump was offered (prior to minimec style being around) as it offered more acurate governing. But I dont know if this would have been used on the JCB?IP: Logged |
Brian
Rules All Things Blue Posts: 2824
From: United Kingdom
Registered: Feb 2002
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posted April 20, 2007 08:10
The "GM" and "GV" mechanical governor was certainly used on the engine but was only for industrial use. These governors were used where more acurate engine revs were required at a constant speed. The governors were available in three speed ranges depending on the required application. The only ones I have ever come across were on combines and generators. Thats why I would think yours is a replacement engine, there would be no advantage of a constant speed governor on a JCB. ------------------
Kind regards
Brian [This message has been edited by Brian (edited April 20, 2007).] IP: Logged |
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