I'm on hold with the CH company in Long Grove,IL. But finally spoke to a live human ! I just sent an email with a couple pictures.. hoping they'll get back to me.
I'm also hoping someone here on the forum may know of a compressor repair shop?(that has a type of old parts book,etc. with a picture/description of this cylinder head)that might have info on this style Air Pump and help me get a physical identification on which model# CH pump it is,then I can know what model to order parts for online.
There's no tag on the pump itself and Campbell Hausfeld was the manufacturer of the actual 'air pump' for many different makes of small air compressors back then for many years.
They made many good USA quality Homeowner/Light Duty and Semi-Commercial Duty air compressors,back in the day.. I would rather repair this older USA one compared to getting a new CH China-made pump.
The valuable employee over there at CH in Long Grove,IL. has came through(800-543-6400)and sent me an email about this compressor.
Sonya Stamm sent me a copy of the owners manual and it's badged as Montgomery Ward at the top;they use actual Campbell Hausfeld part numbers showing on the pages and as you can imagine,not all parts are still available.
The Campbell Hausfeld model number for my pump(from the 80's)is #VT232700JM:Campbell Hausfeld was the parent company of all these small Made in USA compressors back then and they still have some parts. She sent me to mastertoolrepair.com/757-547-8665 in Chesapeake,Va. and the Montgomery Ward PDF Owner's Manual part numbers are what I'm using. I think that's a great start to contact and information. Sonya has been very helpful.
I had a question about proper grade compressor oil as certain newer compressors(even the China-made replacement CH pump for this one,mod.#VT4923)use Non-detergent compressor oil.. The Monty Ward PDF owners manual(1981 copyright date)Sonya sent to me says to use standard 10/40wt. detergent engine/motor oil.
I called her and she said to do what that owners manual recommends,so I'll look to put some Quaker State or other 10/40 detergent motor oil in it.