need help

[RonMar]

Blows when holding in the H position... I agree, it sounds as if one of your glow plugs is "running away" or pulling more current as it warms up. They are supposed to pull less current as they warm. As Greg suggests, disconnect the green wire from the glowplug bussbar(make sure the wire end is not touching anything) located along the left side of the valve cover. If it still blows, you have a problem in the harness or key switch.

If the fuse survives this test, You can reconnect that wire to the glowplugs one at a time(remove the bussbar) and see how much electrical current each glowplug is pulling in the "H" position using the installed AMP gauge on the instrunment panel. You are looking for the one that pulls more current than the others. Do not apply power to the glow plugs for more than about 15 seconds.

Normal operation for my tractor in the Heat position is about a 25+ Amp current draw indication on the amp gauge. As I count to 15, that amp draw drops closer to 20A. That is for 3 glowplugs in parallel, so each carries about 1/3 of the current. For a single plug, you should see about 8-9A of current initially, dropping to around 6-7A after about 15 seconds... Test each individually and see if you have an oddball...

 

[Licking]

Thanks ron
really appreciate the information.

 

[greg_g]

Greg
thanks sorry about the tractor its a farm pro 2420 2 cyl diesel year 2003
thanks again.

Understand. Just modify my advice above to reflect 2 glow plugs vice 3 then. But if it's a manifold heater, there's still one. It's far less common to get a short in a manifold heater though, but I suspect you've got regular glow plugs anyway.

//greg//

 

[Affordable]

If you need the glow plugs we keep them in stock, give us a call or order them online

979-865-4002


Tommy
Affordable Tractor Sales Co.
"Your Jinma Parts Superstore"
Home of compact Jinma, Foton, and Koyker Tractors and Parts, Wood Chippers, Backhoes - Affordable Tractor Sales Company

 

[Smalljobs]

Glow plugs are easy to replace. I've done it. You'll need a deep wall socket. Mine were difficult to extract after I unscrewed them and I made a crude puller with "Vise Grips" and a hammer. A little carefull tapping and wiggling set them free.

 

[greg_g]

Glow plugs are easy to replace.

As long as one is careful to extract the old copper crush washer. If that doesn't come out, and a new one is crushed on top, there's a good chance of ensuing compression loss. Other than that, it's hardly different than changing a skinny spark plug.

//greg//