In the interest of using my newly purchased D4D this weekend (before locating a service manual), does someone have instructions they'd share on adjusting the main clutch and clutch brake? 6/7-'67 D4D 78A, direct drive. No idea at this point as to wet clutch or not, I suspect wet from trolling the archives. While I am asking for help, if it is a wet clutch, how much of what kind of oil does it take to change it? Noticed someone in the past has used a torch on the floor to increase the allowed travel of the clutch lever.....
Looked it up, 78A3369-up oil clutch is standard. Capacity 2-1/8 gallons SAE 30wt oil originally, TO-4 would be the current recommendation.
Amongst the other things that maybe you need to check is to take a very close look at all the pivots in the clutch control linkage in case one or more of them is excessively worn. That could easily be part (or all) of your clutch problem.
Someone did that on the machine I have been working on instead of adjusting the clutch. The guy who sold it demonstrated the machine by manually holding the clutch in.
Nige, looked at that very thing, worn linkage, yesterday after unloading. Thought while the floor was up to check adjustments a tally could be made of the various worn pins, forks/pivots and what-not. Old Magnet, where did you look? The more I looked, granted online only, the more conflicting info I found.. up to six gallons from one source. Plus, comments of dry clutches and wet ones during the same years production, dry being replaced with wet during rebuilds, dry ones with leaks looking like wet, etc. Blind leading the blind no doubt! You and Nige are the best informed I have run across in the last week, thanks for both your thoughts.
Capacities are listed in the back of the 78A1-up Parts Book. If you change the oil in the clutch you should pull and check the suction strainer while your there. It's under the bolted flange on the bottom of the housing.
Clutch oil change is on for Friday, as is an engine oil change. Will look for the strainer, access is from outside? Found a utube video on adjusting the clutch but haven't viewed it, nothing anywhere on the clutch brake in enough detail to follow.
The 78A series went through a fair amount of development. Most of the bugs were sorted out by the time they got to the high s/n's. The D330A was not one of Cat's finest.
Here you go.....
And one more...
Thank you, thank you, Old Magnet! Came to pass, accumulated crud was blocking the linkage, preventing the clutch brake from functioning. The clutch lever bushing (if it has one) is very badly worn. Once I work the machine a bit the plan is to pull the entire clutch linkage out and replace all pivot points and get everything adjustable to turn again. One last question, the clutch hand lever, how is clearance gained to extract the dang thing? The nuclear option (cutting torch) to obtain the room to the outside is the only thing I can see that will work within reason.
Take the shaft out of the hand clutch lever through the transmission case.
Uh, isn't it just a pivot, a machined boss on the housing the lever slides over... like the bolt-on version the forward reverse uses?
Question for Old Magnet ,you had a pdf file on how to adjust the dry clutch on a d4d dozer and now i cant find it , can you put it up again ? thanks