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In my collection of documents I have 2 which may OR may not apply to your machine. I will attach them and insist you do your homework before making any changes based upon these documents. Dave

When owners suspect fuel issues they often rig up a small fuel supply directly to the injection pump intake port. A squeeze mustard bottle is one thing used. The goal is to bypass any fuel system problems which informs you if the problem is in the fuel delivery system or injection...

Are you using the glow plugs? Have you checked the GP's with a multi meter? Have you bleed the fuel system? Follow this link and find the Owners and Workshop manual both free. Kubotabooks Dave

These problems are almost always associated with battery cables and the battery ground cable connection to the tractor frame. Don't mess about with replacement cable ends but follow Jay's advice and buy two new cables Here are a few photos from my collection provided by other owners who have had...

Self bleeding as you usually do. Dave

Thanks for the update. A number of people were suggesting this cause. Dave

Another question: Does the system respond to the "Mode Motor" This is the middle knob on the AC control panel which directs air out different outlets. Dave

It sounds like you do not know of the second cabin air filter which is outside located under the overhang of the roof on the left rear. This may not be your probblem but it is a filter which picks up lots of stuff in the air around the tractor. The condenser located in front of the rad needs...

You need to send me info in a private way. Click on my name at the left of any post I have made Select 'Start a Conversation." In the conversation you need to remind me what you want and provide an email address. Never post an email in the public section Dave

Joe I don't know your tractor so my comments are more generic and based upon the WSM. The WSM shows there are different wiring systems, some with OPC i.e. Operator Presence Controller. Having a cab changes the complexity of the wiring. Do you have a cab.? When I read your post, battery and cable...

The loader has a Brantley Manufacturing label, Oklahoma. A google search shows Brantley, 51 years ago made loaders and backhoes for small tractors. There is a Facebook Group for Brantley stuff at this link Brantley Companies often made implements for tractor companies and painted and labelled...

Forum member Lugbolt put together a page of diagnostic instructions re dynamo/rectifier. What 85Hokie has told you is similar. Dave

I suggest you look over the Smyth Welding web site. They have outlets in the USA. On their site you will see front mounted blowers on many different models of tractors. Smyth I have had one of their 90" pull type blowers for at least 10 years. Dave

Please tell us how you decided two of the three GP's are bad. Follow NIW's advice regarding name brand GP's. This is not the item to buy cheap as failure destroys your engine Dave

I did a little more research on B21. Some have 2 wire solenoid like the one in the wiring diagram I posted previously. These may be OPC equipped tractors although others may correct me. The tractor serial number would be equal or greater than 62889. Tractors without opc have 3 wire shop...

You first need to establish if your machine has an Operator Presence controller i.e. OPC. OPC machines have the two internal coils on the stop solenoid connected together as you will see in the image below. If you do not have the OPC system the sequence to the stop solenoid would be key to...

Try and come up with a small reservoir where the fuel passes thru a Golden Rod fuel/water separator before going into your tractor. I have used one for decades and never have water appear in my tractor's water separator. Watch this video: Golden You could pump the fuel thru the goldenrod or let...

Kubotabooks has a WSM which is where you will find the wiring info Check this link: M5700HD Dave

I found I had saved a copy of this psb. and have attached it here Dave

Take the post by Whitetiger extremely seriously. He is on the "inside" when it comes to Kubota so I suggest you do nothing more until you get your dealer to read the service bulletin. Dave