154 IH carb-throttle linkage not responding

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staninlowerAL
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154 IH carb-throttle linkage not responding

Postby staninlowerAL » Sat Mar 04, 2017 8:09 pm

Finally got my '72 154 LoBoy running and discovered that the throttle will not return to idle position when the dash control lever is moved back to idle position after advancing the rpm. All the parts/linkages moves freely and the engine rpm will advance or idle when the rod to the carb is manually moved to the desired position. It acts like there should be a spring to move the carb "butterfly" back to idle when the dash lever is lowered to idle. Maybe something inside the governor is sticking? TKS Stan

Eugene
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Re: 154 IH carb-throttle linkage not responding

Postby Eugene » Sat Mar 04, 2017 8:47 pm

Soak the governor rockshaft bearing and other parts immediately left of the governor housing/body with solvent for several days. Every so often gently move the lever for the throttle spring. While you are soaking parts in solvent soak the bracket and rock shaft. Parts manual, parts # 5,6,8,9 &10.

Can be done with hood on, easier to remove the hood.

Edit: Lubricate the throttle cable. Apply solvent on both ends of the cable as you move the dash throttle lever back and forth.
I have an excuse. CRS.

staninlowerAL
5+ Years
5+ Years
Posts: 3741
Joined: Fri Oct 29, 2010 11:34 pm
Zip Code: 36558
Tractors Owned: Cubs: (3)'49's, (1)'52, (1)'57 IH Cub LoBoy w/FH, (1)'72 154 Number Series Loboy, '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, '53 MM BG (offset), (2) '49 Avery V's, '51 JD M (regular), '56 JD 420C, with Blade and fire plow, '85 JD 850 (Yanmar) w/72" belly mower, '76 Yanmar 1500, Sears Surburban's, MTD's, Jeeps & other misc. "treasures"
Circle of Safety: Y
Location: AL (Southwest)

Re: 154 IH carb-throttle linkage not responding

Postby staninlowerAL » Sat Mar 04, 2017 9:43 pm

Thanks Eugene. Problem is all the linkage and throttle cable moves freely and has been soaked for a while with PB Blaster and KROL. I noticed that when the throttle lever by the governor is in the idle position, the spring connecting to the cross shaft has some slack. It's this slack that is preventing the shaft to the carb from moving back to idle. It is free and easily moved back to idle so that's why I asked about something sticking in the governor. Another possibility is that the cross shaft might be "wallowed" out on the key way. Probably have to take it apart to see.

Larry B
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Re: 154 IH carb-throttle linkage not responding

Postby Larry B » Mon Mar 06, 2017 12:10 pm

The spring on the throtitle linkage should not be slack. When the engine starts with the control in the idle position the govenor should push the linkage to the butterfly back to the idle stop on the carb. You may have stuck govenor weights. That can cause it not to push the linkage back. If you Rev the enginE by pushing on the linkage you should feel the govenor pushing back.

Als
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Re: 154 IH carb-throttle linkage not responding

Postby Als » Wed Jan 31, 2018 1:40 pm

Can anyone give me the governor shaft bearing #.
Thanks al
If you want something to change you must change something.

Larry B
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Re: 154 IH carb-throttle linkage not responding

Postby Larry B » Wed Jan 31, 2018 3:55 pm

IH 45753D. ROCKSHAFT BUSHING
IH 36152DA. GOVErNOR SHAFT BUSHING


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