"do all powertrols have the pump between the distributor?" ---- No, all powr-trols on A,B,&G tractors came from the factory with a pto driven pump located just in front of the pto seal housing. The pto had to be engaged to use the rockshaft or hydraulics. The governor driven "live" pump was developed for 50,60,&70 tractors. It could also be retrofitted on A,B,&G tractors.
how can I tell if the pump is turned on or off?" ---- The "little rollpin hickie that turns" is what turns the pump on and off. Look next to it and you'll see On and Off marks cast into the pump. ALWAYS turn the pump on BEFORE you start the tractor.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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