b7200 HST Starting problem

[iper]

Hi Everybody,
Thanks in Advance for your help!

I have a B7200 HST 1992 around 620Hrs that sometime does not start well! I would say once every six Cold Start! Before starting the tractor I always give a good 60 seconds Pre-Heating the GoPlug! My tractor is really hard to turn like if something was engaged! The clutch is working good in the released possition! Also the batterie is new and the Alternator is working well too!

Here`s a few question I am wondering!

#1: should a give more engine power so there`s more oil going to the Go plug when I am starting it ?

#2: there`s a Decompression Plug, when I pull it out and holding it in a polled Out possition I can see that the tractor is making a different noise but it does not start when I do this!

#3: It seems that when the bucked is in a Lifted possition the RPM on the tractor reduce and when I pull it down the tractor RPM goes faster! Does it change anything how the Bucket is possitioned ?

Any other Idea Let me know thanks!

 

[Orangefox40]

I too have had starting problems with my B7200HST. The first thing I did was to change the fuel filter. This does require you to bleed the fuel system, first at the filter, (mine has a automatic air bleed hose that runs back to the fuel tank)then at the fuel injector pump with a thumb screw needle valve, (here another hose runs up to the #1 injector) and lastly at the injectors themselves. Here you have to loosen the top most nut on all 3 injectors and turn the engine over several times to pump fuel and air through the system, (I packed rags around the valve cover to catch the fuel otherwise it runs all over the place) then tighten the nuts. You may have to do this a couple of times to get all the air out of the steel pipes between the fuel injector pump and the fuel injectors.
The Decompression knob is designed to allow the engine to gain rpms prior to compression. So, you want to pull the decomp knob out then crank the engine. While the engine is cranking slowly push the decomp knob in to provide compression. If your engine still seems to be labouring while cranking you may want to check that you are using the correct engine oil, i.e. 10W30 and that the oil filter is clean. Also may want to heat the engine oil in cold weather with and external magnetic block heater. Depressing the clutch pedal while cranking will of course take some strain off the engine.
Hope some of this helps.
Ron

 

[Theekillerbee]

Like was said earlier, a block or coolant heater will help you out quite a bit.

For ? #1, no oil goes to the glo-plug in any phase of starting or running your tractor. You can re-heat the plugs at any time while starting your tractor. In fact, if it is running rough while cold, you can turn the plugs back on for 10-15 secs to improve "firing" of your fuel.

#2 The engine will spin at a faster RPM, thus sounding different with the decompression knob pulled out. Since diesel "fires" on compression, the tractor will not run with the lever out. In a cold starting situation, you can pull the knob, engage the starter, the engine will be spinning faster, then push in the knob to regain compression. Sometimes this helps start a cold engine.

#3 Unless you have some kind of flow problem with your hydraulic system, bucket position shouldn't matter, that is unless the cylinder is fully extended, and the valve is still trying to send fluid to the cylinder, this will tax the motor and reduce the rpms, thus when you let the pressure off the cylinder, the rpms increase.

Also do some of the things Ron suggests, and I think you'll have a better starting little machine.