|
1944JDA -- The first post you see is sound stuff. And, here is an excerpt from the JD-H Restoration Guide, 2nd Edition (pp62-63) that may also give you some added insight. Floppy weights can be trouble, and there is a really great chance to throw a weight if things are loosy goosy in there -- its been done, in which case the engine will have a tendancy to race on you, and you hope no other damage is done. See Field Service Bulletin 113-S (Sep 1940) for more on the internals of that governor, and if you do not have access to this bulletin, contact me for this part of it (through the JD-H Restoation Site listed below). I would e-mail it to you.(PatB)
----- ----- ----- ----- -
THE GOVERNOR General -- The JD "H" governor is a multi-function assembly. Its primary function is to control engine speed over a wide range of varying load conditions. For best governor action, there should be no significant play in the fly-weight mounting brackets nor in the weight pins. Bearings are to be examined in accord with criterion set forth at the beginning of this chapter. Look for excessive wear of the lever driving the throttle control shaft. Finally, quality performance depends on the linkage adjustment between the governor and carburetor throttle. Secondary functions are to drive the cooling fan (plus the generator if tractor is so equipped), and the magneto via a coupling at the end of the governor shaft. Inspect the magneto flange and renew as needed. As always, a thorough cleaning makes inspection more effective. The governor-fan shaft interface is a complex and challenging area to restorers of JD tractors. WARNING -- The left-hand (L.H.) governor bearing housing should NEVER be removed and then reinstalled without first removing the magneto from the tractor. When the L.H. governor bearing housing is loosened from the governor, the governor bearing spring forces the governor drive flange away from the impulse coupling of the magneto. When this separation occurs, the impulse coupling on the magneto rotates to release any pressure built up by the impulse spring, changing the alignment of these parts. Most likely, the impulse coupling drive lugs are no longer in mesh with the drive slot of the governor drive flange. To install and tighten the L.H. governor bearing housing under this condition produces sufficient force to break the magneto mounting flange, body or impulse coupling (FSB 96-S, 4-15-39). DISSASSEMBLY AND OVERHAUL -- Overhaul (mainly renewal of governor bearings) requires more than an average over-the-counter gear puller. After six decades together, these parts are likely to resist being separated. Disassembly of the governor was almost as challenging to JD technicians; so much so as to warrant issue of Field Service Bulletins describing special tooling and detailing its use. For removing and installing fan drive and governor gears, FSB 84-S (4-15-38) was issued for A, B and G tractors. This FSB was cited in FSB 121-S (5-15-41) for use with the "H" with an additional instruction to remove a particular snap ring not found on the other tractors. In view of this guidance from Deere & Co. to its repairmen, it is concluded that governor overhaul is a job best farmed out to a machinist having pulling and pressing equipment on hand for this mission. It is always my recommendation to prepare a Statement of Work (SOW) whenever you seek the specialized services of a service provider. This SOW should document in detail what you want done and specify the parts that accompany the SOW. This written document fosters understanding and agreement. Ambiguities will be ironed out as you consult with your machinist. WARNING: In the SOW, spell out the significance of the three woodruff keys and the three snap rings because the resultant position of key parts like the magneto drive flange depends on their use. The magneto drive flange must end up in a precise position. This is to preclude magneto drive issues during final assembly. Attach a copy of applicable pages of PC304 Parts Catalog, and I&T Shop Service Manual paragraph # 149 to the SOW. ++++
|
