74 stops dead when cutting will not start

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inairam
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Posts: 2843
Joined: Wed Jul 08, 2015 10:24 am
Zip Code: 19342
Tractors Owned: 1948 6v - Dozer
1949 with kub klipper belly mower. mag 6v - Mom
1950 with plow, 54 blade, mott mag 6v - Roxanne
1953 54 blade, c22, wood 42 6v
1957 6v - barn Queen
1965 lo-boy with c-3 mower 12 v - Loboy
1974 Horse II 12 v c-2
1975 with woods 42-6 12 v - Horse
1979 long strip 12 v stuck engine
130 with international 1000 loader 6 v
1969 140 with bush hog tow behind mower 12 v
Terramite T-6 4WD Backhoe Perkins diesel
Memberships: Rough and Tumble Engineers Historical Association;Chapter 8 IH Collectors; IH Collectors Worldwide
Circle of Safety: Y
Location: Glen Mills PA

74 stops dead when cutting will not start

Postby inairam » Sat May 20, 2023 7:28 pm

I was using my 74 today and was about 10-15 minutes into cutting and it stopped dead and will not start. I was in a field with no tools. I pulled the coil plug to the distributor and did not see a spark from the coil wire when I cranked it. I never replaced the coil on this tractor. It was a runner and I have had it for maybe 5-6 years so I suspected the coil.

I walked back to the barn a got a coil ( NAPA in the box) and some tools ( did not bring a multimeter to test 12v at the coil) I replaced the coil and no joy. ( BTY it was in IH Coil maybe from 1974!)

The tractor cranks very well and started several times today with no problem.
'
I know I have to test for 12v at the coil but after that any suggestions? This has been a very reliable tractor.

Could the key switch go back for ignition but not for starting?
When you only have 9 horsepower you need to know the names of all of the ponies!

tst
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Re: 74 stops dead when cutting will not start

Postby tst » Sat May 20, 2023 7:45 pm

was the old coil hot ?
points and condenser go bad also
check for 12 volts at coil
found several of the key style switches corroded and melt on the back of the switch

Eugene
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Re: 74 stops dead when cutting will not start

Postby Eugene » Sat May 20, 2023 8:13 pm

tst wrote:was the old coil hot ?
points and condenser go bad also
check for 12 volts at coil
found several of the key style switches corroded and melt on the back of the switch
And loose wire.

Put old coil back on and try to restart. Does, bad coils.

Didn't work, start checking for voltage at the distributor. No voltage work back towards ignition switch then the starter terminal.
I have an excuse. CRS.

staninlowerAL
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Tractors Owned: Cubs: (3)'49's, (1 is for parts), (1)'57 IH Cub LoBoy w/FH, (2)154 Number Series Loboys, (1 is for parts), '76 Longstripe w/FH, Mowers: C-22, Bush Hog 412, Pennington 59, Woods RM42CF, Woods 42, assorted FCub plows, planters, discs, etc. OTHERS: '49 AC B & Ind. Sickle mower, '61 AC D12 Ser 2, '52 8N, '56 Ferguson 35 Deluxe, '47 & '49 Avery V, '53 MM BG (offset), '51 JD M (regular), '56 JD 420C, with Blade and fire plow, '85 JD 850 (Yanmar) w/72" belly mower, '76? Yanmar 2TR15 1500 & Bush Hog SQ42S-2 mower, '78? FORD Dexta, '86 FORD LGT14D & 48" Mower, (2)Cub Cadets & Mowers (MTD), (4) Sears Surburban's, other MTD mowers, Jeeps & other misc. "treasures"
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Location: AL (Southwest)

Re: 74 stops dead when cutting will not start

Postby staninlowerAL » Sat May 20, 2023 9:36 pm

I recently had a no start condition from a cub that had previously started and ran well. Short version of the story is fire when the points opened and closed, no fire from the distributor cap center to ground. 2 hours later after trying a lot of options, I concluded that the coil was shorted internally on the high voltage side. Replaced it with a known good coil and immediately started and running well. JMHO. Stan
Stan in LA (lower AL)
USAF & Reserves, Reg ARMY, ARMY NG (AL)

Gary Dotson
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Tractors Owned: 48 Cub Diesel (Cubota)
53 Cockshutt 20 restored (Shooter)
52 Cockshutt 20 unrestored
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49 Leader "D" (Princess)
49 Leader "D" very rough
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Kubota B6200E
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Re: 74 stops dead when cutting will not start

Postby Gary Dotson » Sun May 21, 2023 7:30 am

For a no start, I always consider the point #1 suspect. Make sure they are clean and properly adjusted.

inairam
5+ Years
5+ Years
Posts: 2843
Joined: Wed Jul 08, 2015 10:24 am
Zip Code: 19342
Tractors Owned: 1948 6v - Dozer
1949 with kub klipper belly mower. mag 6v - Mom
1950 with plow, 54 blade, mott mag 6v - Roxanne
1953 54 blade, c22, wood 42 6v
1957 6v - barn Queen
1965 lo-boy with c-3 mower 12 v - Loboy
1974 Horse II 12 v c-2
1975 with woods 42-6 12 v - Horse
1979 long strip 12 v stuck engine
130 with international 1000 loader 6 v
1969 140 with bush hog tow behind mower 12 v
Terramite T-6 4WD Backhoe Perkins diesel
Memberships: Rough and Tumble Engineers Historical Association;Chapter 8 IH Collectors; IH Collectors Worldwide
Circle of Safety: Y
Location: Glen Mills PA

Re: 74 stops dead when cutting will not start

Postby inairam » Sun May 21, 2023 1:50 pm

I had 12v at the coil so I went into the distributor - broken spring on the points. replaced points and Condenser in the field started right up. this is why I switched to napa ignition products. 4th non napa point spring that broke on me. also put the ih coil back on!
When you only have 9 horsepower you need to know the names of all of the ponies!

cdahl383
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Tractors Owned: 1949 Farmall Cub

Re: 74 stops dead when cutting will not start

Postby cdahl383 » Tue May 23, 2023 2:35 pm

If it just cut out once warmed up it's likely ignition. Check coil, points, condensor, etc. I've had cars in the past do that and it was always ignition related (coil, ignition module, etc).


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