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Case Tractors Discussion Forum

730 injector pump.

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02-28-2008 09:07:35

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Are the 730,830 pumps noisey..? Do they contain their own oil, or is it supplied by the tractor. Can I check it somehow to make sure it is getting lubrication? The service manual really does't say much about the injector pumps. The injector pump and injectors were supposedly rebuilt prior to my purchase. They have the new paint, fresh from the service shop look. Where as the rest of the tractor is faded and oil/dirt covered. I'm not sure there is a problem here, but this is my first "non-green" tractor and I don't know if this is normal. Any advice is appreciated. Thanks.

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02-28-2008 17:25:31

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 Re: 730 injector pump. in reply to Squirrel, 02-28-2008 09:07:35  
Squirrel, reread your post, a 68 definately should not have had that system on it they were pressure lubed fron the oil gallery by a small line visible under the pump and drained back through the gear train at the pump front. Unless I am wrong on this , maybe someone subbed another fuel system or perhaps a complete engine swap.

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02-28-2008 19:56:42

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 Re: 730 injector pump. in reply to mEl, 02-28-2008 17:25:31  
Ya, it is an engine swap, cause the crank is a 700/800 part number. I found that out when I pulled the bottom end to rebuild it. The chassis is CK, the serial number starts with 834.... The block is 11112. I figured they kept the CK filter and pump set up because it looks like the pictures in the service manual. This pump does have a breather type setup on the top rear end of the pump. It is tight, I was afraid to pull on it too hard incase it wasn't a breather/dipstick and I ended up with parts in my hand. According to the service manual I have the Robert Bosch PES external drive pump. The bottom line goes down through a clip by the oil pan too. Sounds just like the one you mentioned. Thanks for the help, I'm not a case guy, just always admired them, and finally got one.

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bradley martin

02-29-2008 16:43:53

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 Re: 730 injector pump. in reply to Squirrel, 02-28-2008 19:56:42  
Squirrel: Due to the engine swap, yours will not have the engine balancer either..late 730/830 had a counterbalancer that ran off the crankshaft (contained in the oil pan) that made for an estremely smooth running engine. Also, there were 2 different camshafts used, each with different valve clearance settings.

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02-28-2008 17:16:53

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 Re: 730 injector pump. in reply to Squirrel, 02-28-2008 09:07:35  
Hi J. I have an old 830 that is not engine lubed, This pump has a drip tube that goes down and the lower end is supported by a tab out from an oil pan bolt. These have a round flat "breather" type cap that is removed to fill the pump with oil. They have a drain plug to drain the pump and if overfilled they will simply "drip out" the drain line, the drain has a trap shape to it. I am not sure of the SN when the change was made but it was early, mine is a lo profile eagle hitch with the air cleaner on the LH side.

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02-28-2008 20:09:47

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 Re: 730 injector pump. in reply to mEl, 02-28-2008 17:16:53  
Mel, how does that breather on the pump come off ? I tried unscrewing it. I can't pull it off, so I tried prying with a screw driver, but it still doesn't want to budge. Thanks.

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02-29-2008 03:55:42

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 Re: 730 injector pump. in reply to Squirrel, 02-28-2008 20:09:47  
As Bradley stated it unscrews, lightly grab it with channel locks and unscrew in the normal direction. mEl

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02-29-2008 14:54:16

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 Re: 730 injector pump. in reply to mEl, 02-29-2008 03:55:42  
Thanks. I got it. The breather was just spinning on the plug, that's why I could unscrew it lastnight. I added a cup of oil, plowed the driveway and put it away. It's still pretty noisy. I can't see the oil in the pump, is there a plug somewhere I can take out and fill it to there..? Should I pull the pump and have it rebuilt, or can I just run it as is? I think I'm going to have my neighbors (case/IH guys) stop over and give it a listen. Thanks for all the help.

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bradley martin

02-29-2008 02:06:11

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 Re: 730 injector pump. in reply to Squirrel, 02-28-2008 20:09:47  
The breather cap will unscrew, normal threads, There are 2 drain plugs in the bottom of the pump. Resevoir only holds about a cup of oil. When pump gets worn, diesel fuel will leak past seals and dilute oil and excess will drain through tube mEl has mentioned.

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02-28-2008 16:22:31

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 Re: 730 injector pump. in reply to Squirrel, 02-28-2008 09:07:35  
It's a 1968, CK. I guess I should have mentioned that. I don't remember an oil tube connecting, I'll have to look again. 4 pressure lines on top, the feed from 3rd stage filter up top. 2 lines in and out of the "transfer pump" on the bottom in the back. And 1 line out the bottom of the pump, with a loop in it and then it just hangs. When it sits, diesel drips out of that line. I've got a can under it to catch that right now.

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bradley martin

02-28-2008 16:01:24

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 Re: 730 injector pump. in reply to Squirrel, 02-28-2008 09:07:35  
The early ones('60 &'61) had a separate oil resevoir that was to be changed at the same interval as the engine oil (& used the same grade of oil). After serial #8173401 or there abouts, the design was changed so that the injector pump was pressure lubricated by the engine lube system, via a tube running up from the oil galley to the injector pump. You can see that oil tube easily looking at the injector pump.

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02-28-2008 14:58:55

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 Re: 730 injector pump. in reply to Squirrel, 02-28-2008 09:07:35  
If I remember correctly injecton pumps are lubricated by the diesel itself.

mEL can you comment on this? Among a lot of us on here you are one that will know for sure. Been a long time since I have fooled with a diesel injection pump but I don't remember them making much more noise than just pumping at pretty high pressures.

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