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Re: 574 Diesel fuel pump removal

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10-05-2013 11:15:52

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Hi Makin Hay,

Paragraph 55 gives the I&T 684 Shop Manual procedure for removal of injection pump involving setting the timing marks and a special tool to pull the injection pump drive gear off the drive shaft, etc,etc.

Now I will give you my method, if you decide to use it it is at your own risk. My method is only good if you repairing the present pump. If you are replacing the pump with a different pump then you have to use the I&T manual procedure of aligning the timing marks before removal of the old pump.

1) Shut off Fuel at tank.
2) Clean everything very well.
3)Remove the rectangular timing cover on the fan side of the pump.
4)With STOP/RUN lever in STOP position crank engine with starter and note the direction of rotation of pump drive gear. If you have to rotate the pump drive shaft, this will be the direction to turn it.
5) Remove Throttle and STOP/RUN control rods.
6)Remove fuel & injector lines at rear of pump and cover both pump and line end with plastic food rap and elastic band to hold in place.
7)Very Important - before loosening any nuts - Scribe a line on pump and mounting surface in at least 2 places.
This will be used to re-align pump when you re-install it. Also scribe a mark between the hub that is held by the 3 cap screws and the pump drive gear.
8)Remove the 3 mounting nuts and washers from pump mounting studs.
9)DO NOT LOOSEN the 3 cap screws on the pump drive gear. 10)Loosen the large nut on the end of the drive shaft until the nut is even with the end of the drive shaft.
11) If you have a friend have him/her hold onto the injection pump, now with a small piece of hardwood or other material that will not damage the drive shaft, drive the shaft rearward. It is a taperred shaft with a woodruff key so shaft should release from drive gear easily, then remove large nut and take pump out the rear.
12) BECAREFUL NOT TO ROTATE PUMP DRIVE SHAFT OR ROTATE ENGINE. If you have to rotate pump drive shaft be sure to always turn it 2 revolutions in the direction that you noted from the drive gear to keep it in time with engine. Reason pump only turns at 1/2 the speed of the engine.

13) Re-install pump with new gasket. Make sure to line up the scribe marks that you made.
14) Reconnect fuel & injector lines but leave the nut loose on 1 line.
15) Reconnect throttle and STOP/RUN control rod. Make sure STOP/RUN is properly adjusted. In STOP position back against plunger and RUN position all the way forward to horsepower adjusting screw.
16)Turn fuel on at the tank.
17) STOP/START/RUN in START position and throttle 1/2 open crank engine and see if it will start.
Caution do not crank starter motor for more than 60 secs at a time and then a cool down period
before cranking again. Engine should start, tighten remaining injector line nut. BECAREFUL NOT to get hit with high pressure fuel from injection lines as the Diesel fuel will penetrate you skin and cause serious injury.
Check for fuel leaks around fuel & injector lines.
18)Check tractor starting ability. If it is harder than normal to start or kicks back on the starter then you should check the injection pump static timing as per I&T Shop manual. Also if it smokes more than normal.

Good luck

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makin' hay

10-06-2013 11:32:52

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 Re: 574 Diesel fuel pump removal in reply to JimB2, 10-05-2013 11:15:52  

Im gonna give it a whirl. But I think the pump is shot. Bought tractor and the guy had a disassembled pump in a box. Tractor doesnt run and he said he tried to rebuild the existing pump, put it back on and it didnt run. If pump gets rebuilt is there a sequence to installing it?


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10-06-2013 17:19:26

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 Re: 574 Diesel fuel pump removal in reply to makin' hay, 10-06-2013 11:32:52  
Hi, do some reading first, search this site's archives for posts by Dieseltech and D-239 (engine that is installed in a 574,674,684 and many other models) or Bosch injection pumps.
First quick check, previous owner could have taken pump off without scribing marks and put the pump on 1 revolution out of time or loosened the 3 cap screws on the pump drive hub. If you loosen one of the injector lines at the rear of the pump and there is any fuel dripping when you attempt to start the tractor? If there is fuel dripping and white smoke out the exhaust and engine does not start then there is a possibility the pump is 180 degrees out of time. Solution is to scribe a mark on drive hub and drive gear, remove the 3 cap screws and rotate the hub 1 revolution in the direction of drive gear rotation, align scribe marks and re-install the 3 cap screws and try to start the tractor again.
If there is no fuel to injectors and the STOP/START/RUN control cable is adjusted correctly then there is most likely a more serious problem.

Send me an email at and I will email you a couple pages from 684 I&T Shop manual.


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