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Case Tractors Discussion Forum
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Case 188D cranking speed

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Patrick Dwyer

06-07-2010 18:07:44




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Can anyone tell me what the cranking speed of their 188D diesel is, or what it should be? Mine is cranking at about 100-130 rpms and it won"t fire.




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Patrick Dwyer

06-08-2010 17:58:14




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 Re: Case 188D cranking speed in reply to Patrick Dwyer, 06-07-2010 18:07:44  
What are some other reasons for slow cranking? The motor is freshly rebuilt and turns relatively easily (for a diesel). It's completely rewired, too.

I've been working on starting it for the past month and a half with no luck. I'm thinking that I will either have to find a reliable mechanic in the CT area, or dig a hole with the excavator and bury this thing (just kidding). It just sits in the yard staring at me... It ran great last year until it spun a bearing. I rebuilt the whole motor over the winter, had it machined, etc. Now - it just won't crank fast enough. I'm nearing the end of my patience.

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TimBinWV

06-07-2010 21:19:02




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 Re: Case 188D cranking speed in reply to Patrick Dwyer, 06-07-2010 18:07:44  
Check your starter out carefully. It may be a 24 volt starter. You have a crawler?



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Patrick Dwyer

06-08-2010 14:37:44




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 Re: Case 188D cranking speed in reply to TimBinWV, 06-07-2010 21:19:02  
Yes, its a Case 310F crawler. I just tried out the wiring:
starter to 1st battery +
1st battery - to 2nd battery +
2nd battery - to ground.

The starter just clicked. Any other ideas? I've tried a rebuilt starter and a newer one. no luck.



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TimBinWV

06-08-2010 20:12:19




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 Re: Case 188D cranking speed in reply to Patrick Dwyer, 06-08-2010 14:37:44  
Is the machine a + ground machine? I know some of the older stuff was, but not sure when it ended. Maybe the 24V fried the solenoid? Look for a 24V solenoid. My Dad's dozer was a late 60's model 450 and it was definately a 24V system.



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Patrick Dwyer

06-09-2010 04:33:32




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 Re: Case 188D cranking speed in reply to TimBinWV, 06-08-2010 20:12:19  
I put everything back together for the 12v system and the starter cranked again, but still only at 100 rpms.

For a positive ground system, what do I do? The machine is a 1963 or 64, I believe.



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TimBinWV

06-09-2010 06:53:30




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 Re: Case 188D cranking speed in reply to Patrick Dwyer, 06-09-2010 04:33:32  
Switch the terminals around for a + ground. I still think you have a 24V system, but had a lost connection somewhere. But, I may be wrong. My Dad's old 450 was a 67 or 68, I think.



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Patrick Dwyer

06-09-2010 17:31:05




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 Re: Case 188D cranking speed in reply to TimBinWV, 06-09-2010 06:53:30  
Well, I tired that, but when I tried to make the last connection, the cable stuck to the battery post. I'm sure it shouldn't do that, right?

Where should I ground this whole circuit out to? I have it bolted to one of the starter mounting bolts right now. I would take some pictures to show what I've got, but my digital camera doesn't work.

I feel like the solution is something very simple, but I just can't grasp this stuff.

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Patrick Dwyer

06-09-2010 07:56:03




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 Re: Case 188D cranking speed in reply to TimBinWV, 06-09-2010 06:53:30  
I'll give that a shot. I called the Case dealer and asked about getting a new starter and they said that the 310F OEM was discontinued. I asked about any other models that used the 188D and the salesman offered the starter from the 580C. Any idea if that would do me any better?



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TimBinWV

06-07-2010 21:23:05




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 Re: Case 188D cranking speed in reply to TimBinWV, 06-07-2010 21:19:02  
My dad had a 450 w/188 diesel in it. We went through the same stuff, only to find out that the starter was 24 volts. Hooked it up accordingly, and it spun normally.



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Patrick Dwyer

06-08-2010 04:40:33




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 Re: Case 188D cranking speed in reply to TimBinWV, 06-07-2010 21:23:05  
Thanks, Tim. How do you wire the 24 volt? I"m not familiar with any other than 12v.



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TimBinWV

06-08-2010 06:01:39




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 Re: Case 188D cranking speed in reply to Patrick Dwyer, 06-08-2010 04:40:33  
Like JGarner says..Hook your your chasis ground to one - on your first battery, then hook the + from that battery to the - on the second battery. Then hook your + cable to the starter.

(I know, if defies logic to hook + to -, but it works)



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TimBinWV

06-08-2010 06:04:50




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 Re: Case 188D cranking speed in reply to TimBinWV, 06-08-2010 06:01:39  
That should have been "hook the last + to the starter wire"



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Patrick Dwyer

06-08-2010 06:03:30




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 Re: Case 188D cranking speed in reply to TimBinWV, 06-08-2010 06:01:39  
Great! thanks guys. I will try this out tonight.



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TimBinWV

06-08-2010 20:00:44




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 Re: Case 188D cranking speed in reply to Patrick Dwyer, 06-08-2010 06:03:30  
schematic



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JGarner

06-08-2010 05:14:54




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 Re: Case 188D cranking speed in reply to Patrick Dwyer, 06-08-2010 04:40:33  
Hook up 2 12V batteries in parallel; ie, positive to negative between the 2 batteries and normal positive to starter, negative to ground on the other two posts, unless you have a Positive ground system.

Just think of it a two flashlight batteries two 1.5V batteries sitting - to + = 3V in your flashlight and so on for higher voltage lights.

Jim



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