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Cub Cadet 7234 wont start after priming to injectors

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johnwill1
Join Date: Dec 2011
Posts: 7 oklahoma
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2011-12-28          181798


Help guys. I have a 7234 that will crank and crank, yet not start. I have voltage on the glow plugs, diesel primed to injectors, plenty of starter speed, good battery(even jumper cabled to my f250), and this little beast will not start. I can get it to run on WD40. Is there a pressure regulator that could be restricting pressure to injectors, or a kill possibly tripped? Any help will be greatly appreciated.



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Cub Cadet 7234 wont start after priming to injectors

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Larry Lutz
Join Date: Jul 2004
Posts: 23 St.Davids Ontario
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2011-12-28          181804


I have developed the same problem with my 7274 (new in 96)1078 hrs
Started up fine on Friday ran for 45 mins shut it off & cannot get it to start.Just like that run to no run
I think its my fuel shut off solenoid thats not working it has the fuel shut off.The part is $170 so I want to make sure its the problem.I have taken the cover plate off the injector pump & we are going to watch the solenoid tomorrow to see if its disengaging when the key is moved to start
I had no symptoms at all the tractor started & ran great & as you say now it will turn over but its not getting fuel so it can only be the solenoid or the injector pump as the fuel pump is delivering fuel to the to the injector pump & the injector pump is $1300 yikes ....


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kthompson
Join Date: Oct 2005
Posts: 5275 South Carolina
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2011-12-29          181813


First not a diesel mechanic; but have you tried lossing the line to an injector just a little to see if fuel it going to the injector? Do know enough to tell you very high pressure there and dangerous. ....


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Larry Lutz
Join Date: Jul 2004
Posts: 23 St.Davids Ontario
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2011-12-29          181815


Yes I did nothing coming out at all but the fuel pump is pumping fuel to the injector pump so I'm HOPING its the solenoid & not the injector pump or I think I will just sell it
Its funny someone else is having the same problem though at the same time hmmmmm ....


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johnwill1
Join Date: Dec 2011
Posts: 7 oklahoma
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2011-12-29          181816


Mine does have diesel to the injectors, I have bleed all lines all the way to the injectors themselves. I don't know if maybe I have insufficient pressure to the injectors, or what the issue is? ....


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Larry Lutz
Join Date: Jul 2004
Posts: 23 St.Davids Ontario
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2011-12-29          181818


Is your fuel pump working? ....


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johnwill1
Join Date: Dec 2011
Posts: 7 oklahoma
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2011-12-29          181819


Yes, Elec pump is working, injector pump seems to be. It will push fuel to the connections at the injectors on block, just will not start. Will run on wd40, makes no sense. ....


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Larry Lutz
Join Date: Jul 2004
Posts: 23 St.Davids Ontario
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2011-12-29          181820


Could the timing be out?
Dont know much about diesels either and it makes no sense to me why mine ran fine then nothing but I have no fuel going past the injector pump ....


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johnwill1
Join Date: Dec 2011
Posts: 7 oklahoma
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2011-12-29          181822


There is an inspection plate on the side of the pump where your throttle bracket is. It has 4 10mm bolts to remove it. You can look in there and see if your solenoid is operating when you turn the key on and off. More than likely the solenoid has failed on yours. If it is operating and no diesel is coming thru the injector pump, then it is the culprit.

As far as mine, I'm not experienced enough with this style pump to know if it could be a timing issue, but you may be on to something there. ....


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Larry Lutz
Join Date: Jul 2004
Posts: 23 St.Davids Ontario
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2012-01-12          182049


An update on the 7274
The Injection pump has 3 broken internal pieces which has resulted in a $550 rebuild but have been told it will be better than new.Apparently these pumps are extremely sensitive but tough also and one little issue can lead to other issues which happened and when I shut it off the break occurred no amount of preventative maintenance can prevent something like that from happening lesson learned.The man working on it is very impressed with the ruggedness of the tractor & said I should keep it.Hopefully he is right ....


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hormer1
Join Date: May 2012
Posts: 12 United States
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2012-05-08          183480


My cub cadet 7205 has developed this exact issue. I changed the glow plugs and fuel filter to no avail. Sometimes when I bleed the lines the machine starts, however now , though cranking strongly , the machine will not start. I also am hoping it not the injector pump. How did you solve your problem? Thanks ....


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hormer1
Join Date: May 2012
Posts: 12 United States
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2012-05-09          183488


Hi, Did you find the problem? My 7205 has the same issue. The fuel solenoid is engaging , the fuel pump is working, and diesel was dripping from the injector when I cracked it open a little. In fact the machine started when I did this, and it restarted after shutting off, that is , until I left it for an hour. Now experiencing the same issue. Thanks for any help you might offer. ....


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hormer1
Join Date: May 2012
Posts: 12 United States
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2012-05-09          183489


Quote:
Originally Posted by hormer1 | view 183488
Hi, Did you find the problem? I have the same issue. The fuel solenoid is engaging , the fuel pump is working, and diesel was dripping from the injector when I cracked it open a little. In fact the machine started when I did this. And it restarted after shutting off, that is , until I left it for an hour. Now experiencing the same issue. Thanks for any help you might offer.
....


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TxJoey
Join Date: May 2011
Posts: 29 East texas
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2012-05-11          183503


glow plugs good,fuel pump working,fuel solnoid working,
fuel to injectors,cranking strong,just will not start,
fuel good,bleed all lines,can bleed injector lines will start at times,cub cadet 7274. ....


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johnwill1
Join Date: Dec 2011
Posts: 7 oklahoma
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2012-05-11          183504


The issue with mine was the actual shaft part of the sylenoid. I had a slight bend in it, and was randomly cutting off the flow. ....


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TxJoey
Join Date: May 2011
Posts: 29 East texas
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2012-05-11          183505


of what solinod,what do you do? ....


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TxJoey
Join Date: May 2011
Posts: 29 East texas
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2012-05-11          183506


john will which solnoid and what did you do?Thank you in advance. ....


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Larry Lutz
Join Date: Jul 2004
Posts: 23 St.Davids Ontario
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2012-05-12          183511


I think the fuel shut solenoid has a "plunger" that slides into the injection pump and slides a "rail" in the pump.Mine had to be removed & rebuilt as it only takes a small amount of dirt or water to cause damage ....


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johnwill1
Join Date: Dec 2011
Posts: 7 oklahoma
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2012-05-12          183512


On the left side of injection pump you will find a solenoid with wires coming into it from the left side. I don't remember exactly how it attaches, but I think it threads in and has a jam nut to lock it. Someone had apparently taken the top of the injector pump apart to replace gasket without removing the solenoid and bent the plunger/shaft slightly causing it to periodically catch and shut off supply. I removed the solenoid and place the shaft in a vise. With a little pressure and love taps with a hammer, I was able to re-align the shaft and never had a problem again. I apologize for being vague, as I no longer have to tractor to look at for reference. ....


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hormer1
Join Date: May 2012
Posts: 12 United States
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2012-05-12          183513


Today's update. Took throttle plate off again and machine started. Blackish liquid came out of plate opening which did not look like 100 percent diesel. Is it possible a cylinder is cracked and this is a starting and performance issue? Thanks everyone for your assistance PS Maybe all these problems are associated with winter gel and or diesel additives. This was the first winter using these products and the start of the starting issues. ....


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TxJoey
Join Date: May 2011
Posts: 29 East texas
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2012-05-12          183517


thanks for the help everyone ....


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TxJoey
Join Date: May 2011
Posts: 29 East texas
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2012-05-23          183627


I have a cub cadet 7274 no shorts,good fuel,fuel shut off good,fuel to injectors,fuel pump working properly,it acts like a car or truck when the crank sensor goes out,it will almost start and doesnt.HELP PLEASE ....


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Cub Cadet 7234 wont start after priming to injectors

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Cyrus55
Join Date: Feb 2012
Posts: 58 W TN
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2012-05-30          183698


Bleed fuel lines at injector and repeat procedure until it starts. Make sure no more air bubbles appear at each injector line, before you tighten the line. I often try to bleed all cylinders at once, but with your situation, I'd do #1, then #2, and if you're lucky, it will start while you're bleeding #3. If this occurs regularly after you have done this, you have an air leak in the system somewhere. ....


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TxJoey
Join Date: May 2011
Posts: 29 East texas
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2012-06-02          183740


Quote:
Originally Posted by Cyrus55 | view 183698
Bleed fuel lines at injector and repeat procedure until it starts.Make sure no more air bubbles appear at each injector line, before you tighten the line.I often try to bleed all cylinders at once, but with your situation, I'd do #1, then #2, and if you're lucky, it will start while you're bleeding #3.If this occurs regularly after you have done this, you have an air leak in the system somewhere.
....


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TxJoey
Join Date: May 2011
Posts: 29 East texas
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2012-06-02          183741


Cyrus55

Thanks for the help. Sure sounds like that is my problem. Any idea where to start looking for the air leak?

Thanks Again,
TxJoey ....


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