Super 90 injection pump leak

[northshorebeach]

Hello: just bought at auction super 90 diesel and it's leaking diesel from around injection pump. guy told me this is common if tractor is used in winter which it was. What's the best fix or is it easier to replace the pump if you can find it. Also no brakes at all. what should i look for first? thx in advance.

 

[Anonymous-0]

Is it a CAV pump?
If it is, clean it up real good with engine spray cleaner, and hose off, repeat, repeat. Take dry clean paper towel and check to find leak. Those CAV pumps are prone to leak around the throttle linkage pivot shaft, and around the fuel cut-off shaft. I will copy and paste my old instructions for fixing this. Tom


Is your pump a CAV? 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

 

[northshorebeach]

Tom Tex: thx for the reply. I will check it out this weekend according to your instructions. Greg

 

[SK Super90]

I managed to complete this same repair also using TomTex's detailed instructions. If I can do it, anyone can!

I took a couple of pictures while I was at it - perhaps you'll find them of use.

Good luck!

Cheers,
Paul
CAV injector pump