Transmission Grease Pump

  • 1748 S
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29 Apr 2018 00:11 #34527 by 1748 S
1748 S created the topic: Transmission Grease Pump
Today O continued the restoration on my trans "grease" oil pump... I had the usual deep cuts from trash being ground into the body by the gears. Someone before me has opened up the buching area where the drive gear shaft fits thru the body. I used my drill press and a special set of round cylinder grinding stones to clean up the wear in the driven and drive gear bores. Both the body and the cover were lapped flat last year. Now to start cutting the gears on the lathe. If I mess this machining up new gears are easy to find. Pictures to come later...

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29 Apr 2018 20:19 #34530 by 1748 S
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This is what I have accomplished so far. Made gears today. The last pic shows how I found my pump. No bushing to hold the drive gear and these were the gears in and out of it. the horribly worn gears were in a coffee can of spare parts.

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01 May 2018 23:43 #34548 by 1748 S
1748 S replied the topic: Transmission Grease Pump
Today I had a chance to pick up my bushing material from McMaster Carr. I purchased 3 inches of 1 1/4 inch soild bar stock 932 bronze material. Chucked it up in lathe and trued it up. Maybe tomorrow I can make enough time to finish it and install it in the pump body.I'm finally getting some much needed spare time. My wife is improving quickly from knee replacement and my help is not so much required every minute of every day. We are both hoping to be able to attend the West Coast Meet in June.We will see later.

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06 May 2018 02:31 #34573 by 1748 S
1748 S replied the topic: Transmission Grease Pump
Bushing machined and fitted. Then the real job of finding the center of the driven gear stud and measure 1 inch plus 2 thousands per the trans shop repair booklet from the club. Sadly there is no mention of how to "find" the center of where the driven gear hole in the bushing is to be drilled to .500 plus 5 thousands clearance. No matter. I got the demention of the cavity the gear rests in. Divided by 1/2. Painted on some blue layout ink and used my vernier calipers to scribe lines to locate the exact center. Drilled pilot holes but had issues with chatter on my garden variety drill press. so now chucking the pump case up in the 10 inch 4 jaw chuck and indicating the center before I continue drilling to .505... Pictures later...

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  • Terry Cockerell
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06 May 2018 05:56 #34575 by Terry Cockerell
Terry Cockerell replied the topic: Transmission Grease Pump
I am wondering about the radial clearance you will have on the gears as I feel this is critical to the pump working efficently.
Attached is a picture of a pump modified by Henry Portz although it has been extended with a spacer and longer gears the end view of the gears will be the same.

T cockerell
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06 May 2018 16:29 #34576 by 1748 S
1748 S replied the topic: Transmission Grease Pump
Thanks Terry. Henry did impressive machine work. I wish now I could have "shadowed" him on some of this work.Looking closely at this pump rebuild I see more of what he did. I see the "spacer" but further questions are what I would like to ask him. It appears Henry milled off the pump body where the flow channel and the gear bores were. Then a brass casting piece was installed. Then maybe a steel or cast iron housing around the brass piece was fitted. Nothing in the club booklet has any information on the axial clearance for the gears to the case they rotate in. It does mention we should have 2 to 3 thousands clearance between the gears and the cover. I like how Henry machined in the brass bushing in the cover. Doing that in my modest shop is very difficult but doable.. Lucky for me my cover is not worn out in this area. I wonder if Henry poured the cast brass piece under this steel piece too. Still very impressive work.

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