3340 injector pump

[guntar]

I am pretty sure my injector pump went on my 3340. I spoke with Zetor mechanic and he pretty much agrees. It was a mechanical one, he suggested an electric one. No more than 10 PSI output. Has anybody done this before and what are the thoughts on this. Money is tight, new kit from Zetor he said around 110. USD. I can get generic electric one for about half the cost.

Any thoughts on this would be appreciated.

I bought this Zetor used, 2250 hrs. I am very happy with my purchase. I found this forum while looking for Zetor info and have haunted it since (Nov 2006). I just haven't had a reason to post. However, now that I do, thanks for being here.

 

[dave_peters]

Guntar
It sounds to me that you are talking about the primary fuel pump otherwise known as the lift pump, not the injector pump.
Replacement lift pumps are not as expensive as a new electric pump would be in the UK at least, and are very easy to fit, so why alter from standard ?
Dave

 

[ixer0]

Hi Guntar

I've fitted electric pumps with no problems. Your lift pump is not complicated so try stripping it out and cleaning it first before you spend any money.

Regards

Mike

 

[tony_adrian]

If it is your lift pump I posted on this fairly extensively about a year ago.

Here's what worked for me: There is a little piston in there that has probably seized. If that is the case remove the pump and take the little piston out. Put the piston in an electric drill and put a little valve lapping compound on the piston, insert it back in the pump and let the drill do the hard work for you. Make sure you keep the drill moving. clean well when you are done, put a little engine oil in it, remount and get back to work.

TBoy

 

[guntar]

Yes it probably is the lift pump. I think Injector pump was mention and I got confused. Sorry about that.

It currently is "parked" at a hay field well away from my house. NO power is readily available.

I did locate an electric fuel pump/lift pump for 28.00 USD output is 4-7 PSI. I had to find it on the web, local parts store wanted 55.00 for one. They carry this one also. My Zetor dealer is 100 miles away so its not practical to head to them.

Ok I would like to pin point the pump I am talking about for my education. The pump I am talking about has the mechanical linkage for throttle setting.

I have no problem priming the system. It will run until what I primed is gone. Then I prime again and it runs. I can feel resistence after a couple of pulls on primer pump. I never had to use primer until this happened. The tractor would set for weeks and then it would start right up.

I don't have service manual either (its on the list now). I hope I have cleared up my messy description. Thanks for the help . I do believe I will try cleaning before spending money on a new electric pump.

Thanks
Guntar

 

[ixer0]

Guntar
In case you're confused the lift pump is the small pump bolted onto the main injection pump. It has the hand primer screwed into it.
Take the outlet off and check you can pump diesel through easily with the hand primer, to make sure you don't have a fuel block. The pipe into the lift pump sometimes gets a piece of grass in it. If this is okay then strip the lift pump. Dismantle it from the outside (the side where the large screwdriver slot is). Don't try to undo the inner nut as you'll distort it so the piston won't move freely.

Mike

 

[Renze]

It's also possible that you have dirt in the fuel line. when you prime it, you can gather some fuel, but when the tractor runs, it starves.

Try to take the hose off and put your mouth to it: If you cant hear bubbles in the fuel tank, the line is blocked. With an air compressor you can use some short blasts of air to clear it, then sneak into the cabinet of your girl and steal one of her nylon panties and put this over the fuel suction pipe as a coarse filter.

 

[ixer0]

Renze

You could get this fella into a lot of bother telling him to rummage through her nylons drawer !!!!!!!!!!!
She may think he's wearing the nylons himself.!!!!! Oooooopps

Regards

Mike

 

[guntar]

I removed the fuel delivery pump. It is held onto the bottom of the injector pump with two small nuts. Once the unit is removed from the injector pump you can see sticking out of the top of the fuel pump is a shiny metal pin that is driven by what appears to be a cam in the injector pump. In my case the pin was seized in its bushing. This pin drives the fuel delivery pump that is the bottom section.

After removing the seized pin I noted no scoring or signs of overheating. There is a little oil journal that appears to lubricate this pin. Using a 17mm wrench I removed the bushing with the pin. I lubricated everything well and drove the pin out with a brass drift. I got some valve lapping compound ($3.00 a tube) and smeared it all over the pin and the bushing. I secured the pin in an electric drill and used it to ream out the bushing. I went slow and every few seconds would clean everything and then test for fit after lubricating. After a while it was sliding smoothly but was not sloppy loose.

Cleaned and remounted the pump, bled the fuel lines at the injectors, and that baby is humming along like new as I type this message.

I wonder if that little oil journal might have been temporarily plugged causing the pint to overheat and expand.

I really do appreciate the elegant simplicity of this workhorse tractor.

Tony

I found this after some digging

I went and started tractor just fine. I emptied sediment bowl (I did this before), it had way more in it this time. Last time it was clean (basicly 1 or 2 particles). I primed it and it ran then died (as expected) I primed it again and it ran for about 25 minutes.

I shut off tractor and removed output hose of lift pump and used pimer to check flow. I didn't know these things could move so much fuel with one pump of the primer . I am guessing no blockage. I primed again to start and it died after running a bit (I expected this). I primed again and it ran for half an hour before I shut it off and had to leave.

I am going to get a few fuel filters sent to me and replace what is in it now. I believe in keeping it simple. The tractor only has 2300 hrs on it. Its 11 years old. If it stalls on me again I will remove lift pump and try the above process. I need to drive to where I need it, so hopefully if it has issues it will not be in the field on a hillside.

I moved the process to this post only for convience. Hopefully, somebody else will benefit from the post Tony made.

Thanks a bunch

 

[dgo3512]

seems like everytime someone posts a problem it happens to me. Fuel stopped flowing to injecter pump. To make a long story short checked everything , filters, etc. and thought it was my lift pump. Bought electric fuel pump same problem. Root problem was clogged pick up tube in tank. Was in the field cutting hay, engine would idle all day but stall when rev up. Quick fix was to swap pick up line with return line to finish baling.

MOTTO OF STORY:

KEEP IT SIMPLE STUPID. (STUPID WOULD BE ME)

Any body need a $50.00 fuel pump?

 

[guntar]

Ok tractor started stalling again. I am attempting to remove lift pump. Do I just unscrew the big "screw" or do I need to remove the two nuts holding the pump on.

Sorry, this is really frustrating me. However, thanks for all the help so far.

Guntar

 

[guntar]

To late. I took off the two nuts holding on assembly. This is either a good thing or really bad.