B7001 questions

[stuart]

I have a set of questions about my B7001, so I'll post them one at a time.

There is a decompression lever just left of the steering column withthe word "stop" on it. I can see no wat to shut off the fuel feed, and other postings suggest that you should not use the decompression lever to stop the engine.

I have also seen reference to a fuel feed solenoid, but I don't see such a beast, and the fuel continuesto feed with the ignition switched off.

In this case, what is the proper way to stop the engine?

[Service Dept Vic]

Hi Stuart,

The proper way to shut down your B7001 is:

Turn off the ignition Key
Move the hand throttle all the way forward as far as it will go.

This shuts off the fuel flow at the injector pump.

[stuart]

Hi Stuart,

The proper way to shut down your B7001 is:

Turn off the ignition Key
Move the hand throttle all the way forward as far as it will go.

This shuts off the fuel flow at the injector pump.

Thanks Vic

I tried that this morning. The tractor continues to run with the switch off and the hand throttle all the way forward. Of course it is now not pushing on the actual linkage, so I tried pulling on the throttle linkage - no change.

Have I got a non-standard fuel system on this thing? Why would the decompression control have 'stop' on the handle?

It is possible that the injector pump is faulty or non-standard, that might explain a separate problem. I had hydraulic fluid leaking into the engine crankcase, from a problem in the hydraulic pump, and into the injector pump. That was fixed by replacing the hydraulic pump.

Stuart

[joekimtkd]

Maybe requires throttle linkage adjustment~?:p

[John C]

My B7100 (North American B7001) has a yellow trigger under the dash below the throttle lever and the engine is killed by simply pulling the trigger which basicly moves the throttle linkage beyond the point that the throttle lever can at it's slowest setting! Mine also has the decompression lever which I've never used. Many people have told me not to use it apparently they have been known to stick and cause other problems. My OM says to use the decomp for cold weather starting but I just preheat for about 30-45 seconds and she always starts right up.

[Service Dept Vic]

Kubota Decomp knobs are void of any writing, so if the one on your Kubota says "STOP", then it's from another tractor brand or it's an aftermarket part of some kind.

Man, I've only had a million of those 7001's in the shop! Think.....think......think........

[John C]

I guess I'm an idiot! I tried to post a photo of the trigger that I mentioned in my previous post and can't seem to get it to work. anyway it is in the Gallery should you care to look. http://www.orangetractortalks.com/kubotagallery/?page=1&image=84
Vic is correct the decomp knob has no writing on it and the cable runs to a lever on top of the engine at the rear, right next to the divider for the battery and fuel tank. If someone has retrofitted a different injector pump perhaps they just used the spot on the dash that the decomp knob had occupied. as I stated earlier I've heard that the decomp is probably best left unused. Hope this helps!!

[stuart]

Thanks for the responses.

I have the same 'trigger' on the foot throttle linkage. Pulling on this has the same effect as pulling on the throttle linkage - namely no effect.

I loosened the linkage from the injectors to the throttle levers, so I could be sure it wasn't binding. This also had no effect. I did not remove the small rocker arm on top of the injector, as I did not want to mess up the throttle idle/max speed adjustment at this time. I believe I can hear this mechanism bumping (inside) against the end of its travel when i twist it. There is almost no travel past the natural return point set by the return spring.

Its too dark right now to get a pic of the top view of the throttle area, I'll do that in the morning. Could someone please post a pic of the injector area on a 'typical' d750 engine for comparison? Thanks

I seem to be very good at finding unusual problems these days.

Stuart

[Service Dept Vic]

Stuart,

Will post that picture tomorrow. Just happen to have a B7100HSTD in the shop right now!

Your 3 point hitch upgrade and top link bracket shipped via Greyhound to Langley yesterday. You'll be in the 3 point hitch business very soon!

[John C]

Here are links to pics of mine, Note the position of the arm in the engine kill position the small arm comes all the way to the stop. sorry for pic quality camera just didn't want to focus. also please forgive my dirty engine, I'm so ashamed!
http://www.orangetractortalks.com/kubotagallery/?image=86
http://www.orangetractortalks.com/kubotagallery/?image=87
http://www.orangetractortalks.com/kubotagallery/?image=88

[stuart]

Thanks - this explains the problem.

A dirty engine is a happy engine - clean ones like mine have not worked very much since importing.
On yours, the short end of the throttle rocker arm goes almost to the max rpm stop. Mine will not rotate that far.


http://www.orangetractortalks.com/forums/album.php?albumid=12&pictureid=112
http://www.orangetractortalks.com/forums/album.php?albumid=12&pictureid=112

http://www.orangetractortalks.com/forums/album.php?albumid=12&pictureid=111

http://www.orangetractortalks.com/forums/album.php?albumid=12&pictureid=111

[stuart]

Based on John C's pictures, I decided to take the cover off under the throttle rocker arm. There were two springs in the compartment. First was short, fat, of thin wire with both ends visible. Second was thinner, longer, of thicker wire and one end disappeared into the injector pump. I determined that the second was the high speed throttle return spring, so the first must have been the shut off return spring. The first looked a bit mangled, so I removed it and replaced the cover. Now the beast will stop when the throttle is all the way off, but it will not naturally go to the slow idle position. If I relax the throttle all the way, it shuts off.

Given the comments earlier about these engines preferring to idle a bit faster, I think I'll just manually control the idle for now, until I can get a replacement spring and a proper exploded view of the inside of the box.

Next step will be to paint over the word 'stop' on the decompression lever.

Thanks for the help on this one.

[Service Dept Vic]

Stuart,

One of those springs is there to aid the engine in starting and is called a govenor start spring.

Would do well to replace ASAP.

[stuart]

Thanks for the note, Vic.

I went in to the local Kubota dealer and asked about the springs for a D750 engine, and the computer printout exploded view was not very good. I was still a bit cautious about grey market, but the parts guy asked for a tractor model number - I told him, he just said "oh, grey market" and went into another room, came back with a B7001 shop manual. The views in it were much clearer.

There are two springs - the short fat one is the 'start spring', with a valid part number. I ordered one, it will be in from Toronto next week. The longer one is the governor spring.

I was there anyways, had to get 2 more bolts for the 3 point hitch top bracket. Total cost, $6

Stuart

[John C]

Stuart,
I'm glad your dealer didn't freak out when he found out it was a B7001. Should you ever need to disguise it's identity I believe that the North American version of your tractor is B7100. I don't know what if any difference there is between the two models. My B7100's serial # is B7001-60269. when I found this out I thought mine was a disguised gray but when I asked the dealer he looked it over and assured me it was a B7100 so there must be some small give aways. Not that it would have mattered one way or another I'm just curious that way!
John