This site uses cookies to maintain login information on FarmallCub.Com. Click the X in the banner upper right corner to close this notice. For more information on our privacy policy, visit this link: Privacy Policy
NEW REGISTERED MEMBERS: Be sure to check your SPAM/JUNK folders for the activation email.
B with Exhaust lift
Forum rules
Notice: For sale and wanted posts are not allowed in this forum. Please use our free classifieds or one of our site sponsors for your tractor and parts needs.
Notice: For sale and wanted posts are not allowed in this forum. Please use our free classifieds or one of our site sponsors for your tractor and parts needs.
-
- Posts: 8
- Joined: Sun Mar 31, 2024 9:48 am
- Zip Code: 99130
- Tractors Owned: Cub -1948
Cub -1949 (w/rear lift)
A – 1941
B (w/exhaust lift) – 1947
C (narrow frontend) – 1950
200 – 1946
H – 1940
Super H (narrow frontend) – 1940
M (narrow frontend) – 1951
M – 1950
400 –1956
B with Exhaust lift
So, I have a B that has the exhaust lift on it (and 2 one way plows). We rebuilt the cylinder leather cup seal, and reassembled. I read on here that we should add a little oil daily to the cylinder. I am currently rebuilding the carb, as it was not working good, and am thinking that may be one reason the lift is not lifting the plow. Attached is a picture, of part of the exhaust lift, what is it?
-
- Team Cub
- Posts: 17351
- Joined: Sun Feb 02, 2003 2:59 pm
- Zip Code: 55319
- Circle of Safety: Y
- Location: MN
Re: B with Exhaust lift
That is the control valve. In simple terms, it is a check valve. The system has 3 main components: pressure valve, control valve, and cylinder.
The pressure valve is located on top of the exhaust manifold. When closed, it forces exhaust to pass through the control valve to the cylinder. Failure of this valve to close tightly is a main cause of failure to lift. Rust is the main problem. It needs regular maintenance.
The control valve has a check valve with a neoprene washer as the valve seat. When operated to lower the lift, a disk is pushed off the seat. Deterioration of the washer can keep the lift from staying up. Swelling of the washer can sometimes prevent the lift from lowering. Running the engine with the hose that connects to the cylinder open tends to overheat this valve and contribute to deterioration of the washer.
The cylinder is fairly self-explanatory. It needs a regular dose of oil to keep the leather seal in condition.
The pressure valve is located on top of the exhaust manifold. When closed, it forces exhaust to pass through the control valve to the cylinder. Failure of this valve to close tightly is a main cause of failure to lift. Rust is the main problem. It needs regular maintenance.
The control valve has a check valve with a neoprene washer as the valve seat. When operated to lower the lift, a disk is pushed off the seat. Deterioration of the washer can keep the lift from staying up. Swelling of the washer can sometimes prevent the lift from lowering. Running the engine with the hose that connects to the cylinder open tends to overheat this valve and contribute to deterioration of the washer.
The cylinder is fairly self-explanatory. It needs a regular dose of oil to keep the leather seal in condition.
-
- Posts: 8
- Joined: Sun Mar 31, 2024 9:48 am
- Zip Code: 99130
- Tractors Owned: Cub -1948
Cub -1949 (w/rear lift)
A – 1941
B (w/exhaust lift) – 1947
C (narrow frontend) – 1950
200 – 1946
H – 1940
Super H (narrow frontend) – 1940
M (narrow frontend) – 1951
M – 1950
400 –1956
Re: B with Exhaust lift
so, I rebuilt the carburetor, and put some oil in the exhaust lift cylinder. The B will lift the plow to latch, if someone gooses the throttle linkage above what the governor is having it run at. I tried adjusting, and have the low idle at 560, but with full throttle it only goes up to 1260, and I believe it should be up to 1400ish. I tired lengthening the rob from the governor linkage to the carb (2 turns), to push the throttle more open. It did not appear to help.
-
- Team Cub
- Posts: 17351
- Joined: Sun Feb 02, 2003 2:59 pm
- Zip Code: 55319
- Circle of Safety: Y
- Location: MN
Re: B with Exhaust lift
DoubleJFarmsWA wrote:. . . I tired lengthening the rob from the governor linkage to the carb (2 turns), to push the throttle more open. . . .
Yeah, that won't help. That link is adjusted with the engine off. Remove the pin, push the throttle control fully forward and pull the disconnected linkage fully back. This sets both at wide open. Adjust the length of the link so the pin will just slide in without moving the other parts.
You should easily get high speed idle up to 1,540. (1,400 is rated speed at full load.) You adjust fast idle speed with the high speed adjusting screw, a cap screw on top of the governor housing. It will be screwed in part way with a lock nut holding it in place. Loosen the lock nut then back the screw out a little at a time until you get the right speed. Then lock it in place with the lock nut.
My experience is that you need the engine pretty well rev'ed up for the lift to work. If it doesn't after you tweak the engine speed, you may need to clean up the pressure valve. Rust causes problems with them.
-
- Posts: 8
- Joined: Sun Mar 31, 2024 9:48 am
- Zip Code: 99130
- Tractors Owned: Cub -1948
Cub -1949 (w/rear lift)
A – 1941
B (w/exhaust lift) – 1947
C (narrow frontend) – 1950
200 – 1946
H – 1940
Super H (narrow frontend) – 1940
M (narrow frontend) – 1951
M – 1950
400 –1956
Re: B with Exhaust lift
Ok, got back at it. Found the thrust bearing in the governor was bad. On the exhaust lift, the pressure valve needs some work. What was the gasket? And does the linkage, supposed to go thru a bushing or something? Mine has about 1/4 inch of slop.
-
- Posts: 8
- Joined: Sun Mar 31, 2024 9:48 am
- Zip Code: 99130
- Tractors Owned: Cub -1948
Cub -1949 (w/rear lift)
A – 1941
B (w/exhaust lift) – 1947
C (narrow frontend) – 1950
200 – 1946
H – 1940
Super H (narrow frontend) – 1940
M (narrow frontend) – 1951
M – 1950
400 –1956
Re: B with Exhaust lift
got it working! Just went out and plowed a little to test it all out!
-
- Team Cub
- Posts: 17351
- Joined: Sun Feb 02, 2003 2:59 pm
- Zip Code: 55319
- Circle of Safety: Y
- Location: MN
Re: B with Exhaust lift
Just looking at your follow-up question. You probably figured out by now, no gasket or bushings in the pressure valve.
-
- Posts: 8
- Joined: Sun Mar 31, 2024 9:48 am
- Zip Code: 99130
- Tractors Owned: Cub -1948
Cub -1949 (w/rear lift)
A – 1941
B (w/exhaust lift) – 1947
C (narrow frontend) – 1950
200 – 1946
H – 1940
Super H (narrow frontend) – 1940
M (narrow frontend) – 1951
M – 1950
400 –1956
Re: B with Exhaust lift
So, with using the plow this weekend, my cylinder sealed up better and lifts the plow pretty well. However, now it will not lower (unless I disconnect the hose). So, I am assuming the washer/valve in the control valve is messed up. Any tips on rebuilding that?
-
- Team Cub
- Posts: 17351
- Joined: Sun Feb 02, 2003 2:59 pm
- Zip Code: 55319
- Circle of Safety: Y
- Location: MN
Re: B with Exhaust lift
No complicated stuff in there. Take it apart, clean it, put it back together with a new neoprene washer if needed. Since rust can be a problem, I have lightly coated the entire inside with a little grease.
Don't overlook a possible simple fix. -- Make sure the lever on the side is actually being pushed to the drop position when the control handle is pushed forward. As I recall, it depends on a cotter pin in the control rod.
Don't overlook a possible simple fix. -- Make sure the lever on the side is actually being pushed to the drop position when the control handle is pushed forward. As I recall, it depends on a cotter pin in the control rod.
Who is online
Users browsing this forum: No registered users and 0 guests