Joe I found the following 3 times I have written on this from the archives, these should help you.
Tom
1. I have written this one up before, but am having computer trouble. Might search MF board archives. Spray the area real good with engine cleaner gunk and hose off. Cleaner the better, if you drop a ball of grease/dirt into the top while the cover is off - big trouble. MOST important thing is to have some paper and pencil when you take off the cover. Just pull it up a little bit, look under it at the spring linkage. One end is a multi-hole flat shaft. Write down which hole it is hooked in. Other end is shaped like a tombstone (round topped) with multiple holes, again write down which hole it is hooked in. The tractor will not run right or put out correct power unless BOTH are reconnected in the proper holes. Now remove spring, remove top. Next remove the throttle shaft and kill shaft. Next remove the little O-rings on the throttle shaft and the kill shaft. There are 2 o-rings on each. Replace with new. Use a new gasket for putting the top back on. About 4 hands is nice to get the spring back in the right holes during reassembly. Fixed my MF-690 couple years ago. Absolutely no leaks now. Cost of job between 5 and 6 dollars. Good luck, post back if problems. Tom 2. Is your pump a CAV? If it is a CAV, I have been there done that. 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. Now using a white paper towel, start looking for your leak; it will show up real easy on the dry, clean paper towel. See if there are small leaks around the cutoff shaft and the throttle control shaft on top of the CAV pump. If so post back in new thread and I will give exact instructions on the repair.
Tom 3. Bob, I can't tell from the picture if it is a CAV pump. If so, the top is removable. 1. clean, clean before you start, one piece of crud dropped into the bottom of the pump will cost you about $600-700. 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 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. 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. 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 kill shaft. Each shaft has 2 o-rings. If the o-rings are not leaking now, they soon will so replace them by all means. Total cost of gasket and 4 o-rings is about $5. 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, not even enough to collect dust on the pump. Post back if you need more help. Tom
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