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3600 3 Cylinder Injection Pump

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Apple Farmer

10-25-2006 18:54:15




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I was wondering if any body knows where i can get a rebuilt injection pump fairly cheap. mine is leaking around the seal. Tractor still runs fine just leaks alot of fuel.




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TomTX

10-26-2006 08:51:00




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 Re: 3600 3 Cylinder Injection Pump in reply to Apple Farmer, 10-25-2006 18:54:15  
If it is a CAV, I have been there done that. The CAV is prone to leaking around the throttle shaft and the cut-off shaft. First you will need to get 2 or 3 cans of engine cleaner. Clean, clean, and clean again the whole area. After each spraying, hose off, let dry and do it again. Cleaner the better, if you drop a ball of grease/dirt into the top while the cover is off - big trouble, one piece of crud dropped into the bottom of the pump will cost you about $600-700. Now using a paper towel, start looking for your leak; it will show up real easy on the dry, clean paper towel. 1. MOST important thing is to have some paper and pencil BEFORE you take off the cover.
2. Remove shut-off linkage and throttle linkage. 3. Remove screws or nuts holding lid on. 4. DO NOT just lift up the top. Lift it just a little, very carefully so you can peek under it. A spring is attached from the lid to the bottom part of the pump. One end of spring is hooked on a wide post looking like a tombstone. The tombstone has several holes in it. Write down which hole the spring is hooked in before you remove it. The other end is through one of the holes in the flattened end of the control rod. Again write down the hole it is in before you remove it. This step is VERY IMPORTANT. If the spring is not reassembled to EXACTLY the same holes on both ends, the tractor will never run right again. The same pump can be used on different model tractors with the only difference being how the spring is hooked. My MF dealer mechanic can tell the proper holes by using the 3 numbers on the CAV. Now remove the spring, and lift off the lid. 5. Write down the model/year of tractor, and the model of the CAV pump and serial number. There are 3 different numbers on my CAV pump.
6. Take the cover with you and head to MF dealer and purchase a new gasket and four (4) tiny o-rings that fit around the throttle shaft and the shut-off shaft. Each shaft has 2 o-rings. If the o-rings are not leaking now, they soon will so replace all of them. Total cost of gasket and 4 o-rings is about $5 or $6. 7. You will need a little patience and two extra hands to get the spring attached on both ends and the new gasket fitted. I did this complete procedure on my MF 690 and now it has NO LEAKS.
Tom

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RodInNS

10-26-2006 07:40:23




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 Re: 3600 3 Cylinder Injection Pump in reply to Apple Farmer, 10-25-2006 18:54:15  
Depending on where the leak is at, you might fix it yourself. If the throttle shaft is leaking, then you can CLEAN the are very well, then carefully cut the wire tamper seals and then remove the top of the pump. Inside that cover there will be a govenor spring attached to the throttle linkage. There are 3 holes in this linkage for that spring, so carefully note which hole the spring is in, and then remove it. The throttle shaft and the fuel shutoff shaft will then slip free of the cover and you can replace the O-Rings on the shafts. Reassemble in reverse.
If the leak is on the pump drive shaft then the pump can be removed and the seal changed... but I haven't done that so I can't fill you in on the details. The other option is sending your pump out for a rebuild/repair at an injection shop. If that's all that's wrong with the pump then it shouldn't be an expensive fix. Personally I would sooner do that than buy a used pump. For what it's worth....

Rod

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