M7040 Tractor hand throttle sticking..help!

[andalusia]

M7040 tractor about 10 years old. Stored under cover. Hand throttle is starting to stick. Handle moves easily but either tractor does not rev after handle moved forward or it sticks in high rev even when moving handle back. It seems to work if you move handle quicly to max or min but not slowly.
Any help to resolve would be appreciated. Note: the pedal works fine.

 

[SidecarFlip]

On both my M's (9000 and 105), the hand throttle is connected to the foot throttle with a mechanical linkage. Maybe you have a sticky joint. Mine are both 10 years old.

 

[russell.still.5]

Like stated before. There is a cable that runs from the hand throttle to the foot throttle. Then a cable from the foot throttle to the injector pump. Sounds like it’s the cable from the foot throttle to the injector pump sticking.


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[andalusia]

Thanks for the input!
If the pedal is working without sticking and the hand throttle connects to the foot cable and the hand throttle seems to be sticking....wouldn't it be more likely to be in the cable from the handle to the foot??

I'm no expert, just trying to understand how the cable would work via the pedal but then stick with handle.

Maybe I'm missing something. If you could tell me where I'm wrong in my thinking I would appreciate.
Thanks!

 

[andalusia]

Is it an easy access to the linkage by the pedal? I can easily see the forward end of the cable where it attaches to throttle.

 

[russell.still.5]

I can’t remember exactly how it works, but you can push the foot throttle and speed the tractor up without moving the hand throttle. That’s why I think it from the foot throttle and the injector pump.


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[Tx Jim]

My WAG is governor needs to be inspected. How many hrs are showing on speed-hour meter? Do engine rpm's respond similar with foot control? Another thought is hand throttle cable is rusty/dirty.

 

[andalusia]

Thanks for input. My foot pedal is responding normally. Just the hand throttle is sticking. I am out of town right now but will be back this weekend and will check the hrs on the tractor and post.
Also see if I can locate whre the cable connects to pedal and see if I can clean/lubricate anything I can find.

 

[fruitcakesa]

On my old L4630, when I broke the cable from the hand throttle, the foot pedal continued to work.
The cable connects to the pump

 

[Tx Jim]

Thanks for input. My foot pedal is responding normally. Just the hand throttle is sticking. I am out of town right now but will be back this weekend and will check the hrs on the tractor and post.
Also see if I can locate whre the cable connects to pedal and see if I can clean/lubricate anything I can find.

IF foot pedal controls engine rpm's then ignore what I stated about needing to inspect operation of governor. Engine hrs not necessary either.

 

[North Idaho Wolfman]

The cable from the hand throttle to the foot throttle is probably corroded / contaminated or damaged in some way so that it's not moving freely, if you disconnect both ends and remove the cable you can easily lube it or replace it.

To give you a more complete answer, I would need either the serial# of the tractor or the exact model as there is 21 sub models of that tractor series.

If you don't have the WSM (aka service manual ) you can get a copy here, it might not be 100% right depending on what version of tractor you have, but in general it should help.

https://www.kubota.cz/data/soubor/WSM_M6040_7040 EN.pdf

 

[andalusia]

Just got home and checked my tractor:

Model: KTC/M7040
Serial #: 60614

Used PB Blaster on area where I could get to but made little difference.
I can easily remove the top cover from around the hand throttle. Not sure how to remove the side panel. I do have the bucket controls mounted anterior to the hand throttle case and from what I can tell it looks like removing the side panel screws will not allow me to remove the panel.

I am noticing that I can gradually throttle up now but when I try to reduce RPM's with handle it only drops to 1200RPM and to slow further I have to manually move the throttle linkage.
Access to the throttle cables to adequately force some lubricant in is not really possible. Looks like I can remove front cable at throttle, but access to remove at foot pedal is limited. What panel/panels can I remove to get to this end of cable easily?
Thought I would remove and clean cables if I can get to. Thanks for the link to the servicing manual but I am not finding much on throttle cable access or repair.
Thanks for helping.

 

[Russell King]

I don’t know if this can work for the cable arrangement but try this if you can.

Get a plastic squeeze bottle with a nozzle tip. Like ketchup in restaurant or honey comes in. Clean it out and check the tip will fit into the cable housing. Put some PB Blaster or other penetrating oil in the bottle. Take the end of the cable and insert it into the nozzle and push the nozzle into the cable housing. Squeeze the fluid into the cable housing and hopefully out the far end of the housing so cover that with a rag.

Work cable if possible

If not wait an hour, repeat until freed


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[andalusia]

Here is a picture of the photo in the repair manual of the accelerator cable connected to the throttle. If I disconnect the cable by removing the cotter pin, what else do I need to remove/undo to be able to lubricate the cable.
Not sure what parts at the end of the cable need to come off?
Also don't want to change the cable settings.
Thanks for your input.

PS I have seen those motorcycle cable lubers. See attached photo.
Just not sure what to remove to use something like this.

 

[andalusia]

Here are parts manual images of both cables

 

[North Idaho Wolfman]

Your problem is not the cable that runs to the injection pump as the foot throttle works fine, your problem is in the rear cable that runs from the hand throttle to the foot throttle.

 

[russell.still.5]

Your problem is not the cable that runs to the injection pump as the foot throttle works fine, your problem is in the rear cable that runs from the hand throttle to the foot throttle.

Agreed!


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