Posted by Clint Dixon [172.68.58.86] on Friday, April 27, 2018 at 20:06:48 :
In Reply to: Re: more power stgeering questions posted by Clint Dixon [172.68.58.86] on Thursday, April 26, 2018 at 20:12:41 :
Another thing of interest that I find in the 1957 D-16325 parts list is the drive belt. Under Code 14-71-10, the drive belt for the mechanical governor (listed as "Variable Speed Governor" in the section heading) is shown as: PULLEY, Drive, part number 1117 609. This was the same belt that had been listed previously ever since a change took place at serial number 83913254. Under Code 19-54-90, two different belts are listed: BELT, Pump Drive and Governor and Pump Drive, with respective part numbers: 1676 312 and 1676 313.
This finding reinforces what I learned last night - that the W-300 could be ordered with a mechanical governor and manual steering and the same governor mounting bracket, governor drive pulley, and drive belt were used as the years prior. But, if a W-300 was ordered with a mechanical governor AND power steering, a different drive belt was needed along with a newly designed mounting bracket and an added adapter plate unique to the pair. And, if a W-300 was ordered with only power steering and no governor, the same new mounting bracket was used but with a different adapter plate unique to the power steering pump.
For 1958, parts list D-16452 was issued that covered both the 1957 KW300 and the 1958 LW300M. For 1959, parts list D-16887 replaced the prior lists and covered only the 1959 models - for this discussion, the M6-W300M. This list was then replaced in 1960 with 81-690-0005. This new list covered only the 1960 models - for this discussion, the P6-W300M. The special drive belts for both the governor and the power steering pump were dropped from the lists after 1958, as were most of the other part numbers I mentioned last night. The 1960 P6-W300M was shown as still being available with power steering, although most of the parts and part numbers were no longer shown. After 1958 the mechanical engine governor was also no longer listed.
For 1957 and 1958, in parts lists D-16325 and D-16452, nothing out of the ordinary is found in the generator sections of the lists. There is no mention of power steering in these sections. Then, starting with list D-16887 covering only the 1959 "M" series trucks, references to power steering start to show up next to specific generator part numbers. There are no specific references in this parts list to the M6-W300M model, but in 1960 list #81-690-0005, specific references to the P6-W300M are shown in the generator section along with references to power steering.
All of this evidence leads me to the conclusion that 1957 and 1958 model trucks (KW300 and LW300M) may have been the only ones to use a power steering pump, belt driven, and independent of the generator - at least according to the official parts lists. It also drives me to the conclusion that by 1960, the remote power steering pump had been replaced by the piggyback generator version. The 1959 list does not provide enough data to make a ruling on that years model M6-W300M.
I have seen at least one truck at a Rally with a power steering pump mounted where one would expect to find a mechanical governor - above the front right side of the cylinder head. It appeared to be original. I do not remember what year the truck was but now I will have to go searching through old film photos that I took back then.
If I find time I will search through 1961 and up lists to see what I find.
Junior