310 Utility Dash Throttle-VTA 655

[Dennis Zembower]

This message is a reply to an archived post by Joe Wa on February 27, 2011 at 21:58:13.
The original subject was "Re: 310 Utility Dash Throttle".

Joe-What function does the part number VTA 655 perform. It looks like a diaphragm of some sort?-DZ

 

[Joe (Wa)]

This is the pic I posted on that thread. Perhaps your nr is VTA855?

VTA855 is the metal piece that moves in and out with the flywheights as engine speed changes and acts upon lever VT3553 to rotate the gov linkage.

Joe

 

[Jeff B.]

I don't mean to steal your post, but I have another question:
My 311 has the identical linkage. There's a ton of play in the lever. I have to pull it nearly halfway down before the slack comes out and the engine speeds up. There is no apparent wear in the rods or swivels that I can see. It that normal, and is there a way to adjust the slack?
Thanks in advance.

 

[320B]

I have a 320 with the same problem.Looking at the picture I think you would adjust it by putting in stronger springs.

 

[Joe Young]

Jeff B and 320B

Actually there are several points of adjustment. It is possible someone has put the wrong governor spring (VT 4588) on your tractor. The strength and size of that spring is important to the correct operation of the governor. Someone had cobbled the wrong spring on my 312 which caused the system to work improperly. The correct spring is available from Case. The current part number is A30572.

I've found that this throttle linkage system actually works very well when it is cleaned and adjusted properly. Three key points that tend to get "gummed up" or rusted are:

1. The rod which is held in place by the cast frame under the battery box (part number G10745) needs to be free and loose. The best way to ensure this is true is take the entire assembly apart and clean all parts, which may include the use of a wire brush and/or emory paper.

2. The rod (part number G11203) and guide (G1226) are often gummed up or greasy enough that movement is restricted. A good cleaning and a slight application of silicon spray have always solve the problem for me.

3. There are ball joints on each end of two rods (G45128 & VT4589) that have proven to be a problem on a couple of my tractors. If the ball joints are worn; replacement them. In a couple of cases, the ball joints have just been stuck. If that is the issue, a little penetrating oil for cleaning and a little silicon before reinstallation seam to solve the problem. These two rods are also adjustment points for the system.

I've had several of these systems "Modified" by a previous owner by using a number of different spring concoctions, but those are just compensating for a problem somewhere in the system. Get the entire system functioning properly and no additional "engineering" will be necessary.

I have a couple of pages from the Service Manual that discusses the adjustment of the system as well. If you would like a copy please drop me an email. [email protected] - Joe

 

[Joe (Wa)]

As you move the throttle lever down check that bellcrank G1079 on the lower end moves equal distance. If not then friction disc G10786 is worn out or more likely the friction plate support G1077 is broken (very common) and adrift from the steering column.

Less likely is a weak or wrong gov spring VT4588 or binding in the gov that requires excessive spring tension to overcome. The other two springs VT5113 & VT2434 are linkage return springs only.

Joe

 

[320B]

(quoted from post at 08:32:58 11/06/11) As you move the throttle lever down check that bellcrank G1079 on the lower end moves equal distance. If not then friction disc G10786 is worn out or more likely the friction plate support G1077 is broken (very common) and adrift from the steering column.

Less likely is a weak or wrong gov spring VT4588 or binding in the gov that requires excessive spring tension to overcome. The other two springs VT5113 & VT2434 are linkage return springs only.

Joe

hanks Joe and Joe,next chance I get I'm going to put your info to use.

 

[Jeff B.]

Joe and Joe Y. Thank you both for your excellent information. I have overhauled the motor 2 years ago and addressed everything along the side of the block. All that stuff works great. I"m inclined to believe MY problem lies upstream in the dash area. I see what needs to be looked at though. It well could be that the friction plate is broken if that"s a common problem. I"ll concentrate my efforts there.
Thanks again,
Jeff