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656 Hydro Fix Up


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I bought this 656 Hydro from my place of employment after they bought another tractor to replace it. It’s lived at a fertilizer plant since 1974 and on the owner of the plants farm before that. It has 2700 Hours and spent most of its life dragging anhydrous wagons between the scale and the ammonia rack. 
 

It developed a miss a year or two ago and the decision was made to side line it and replace it. I caught the guy that runs the place in a good mood and picked it up very reasonable. I have always wanted something to tinker with and hopefully paint eventually as I learn how to. 
 

It has a couple known problems:

1. Miss on the #5 and possibly #4 Cylinder. Fairly certain it’s a valve issue.

 

2. Hydro range selector stuck in low. It seems to be stuck in the iron next to the lever as it shifts at the transmission. 
 

3. The wiring is horrid. The key switch terminals sometimes touch and only 2 fender lights work.

Started working on it this weekend by ordering new ignition parts and pressure washing it, until my high pressure hose burst…. What do you guys use to degrease tractors before working on them? Oven cleaner? 

I don’t know where this one will end up but we’ve started now! 

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Nice! If the miss is a valve a quick compression test will reveal that. I've used various de-greasers, never found one that is the greatest. Never tried oven cleaner, persistence with the power washer is as important as anything.

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Your 656 is an early one like mine.  No hydro decals on the hood and a decal instead of a metal plate on the hydro quadrant.   Does yours have a hydro filter down by the starter?  The early ones (including mine) do not.

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Congrats on the purchase. 

I am somewhat of a hydro fan as I am on my second 656H and have one more for parts. 

I wish you well on the stuck high low lever. 

Mine is extremely stiff and have like you figured it to be on the shaft itself where it goes through that last housing. 

All other linkages are free. 

Someday when I get time I am going to try to pull it out and clean it up. 

Good luck on fixing her up. 

Here is a shot of mine

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On 7/31/2022 at 1:48 PM, nepoweshiekfarmalls said:

Your 656 is an early one like mine.  No hydro decals on the hood and a decal instead of a metal plate on the hydro quadrant.   Does yours have a hydro filter down by the starter?  The early ones (including mine) do not.

No it does not have a filter. I’ve seen some of your threads of rebuilds on here and it seems you do a nice job! 
 

Tonight’s update: 

Replaced the plugs, wires, points, condenser, and cap. Still missing on the number 5 cylinder. Started soaking the manifold bolts with PB Blaster. Need to move some equipment around to get this in the barn. I’m afraid the next step is to remove the head. Of course will start with valve cover and look for obvious signs first.. Maybe get to that this weekend. 

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Update 8/6/2022

 

Did a compression test on the tractor this morning and found only 25ish psi on 4 and 5. 
 

pulled the head off to find a blower gasket between the two. Looks to have been done for a long time as I could not find any pieces of gasket. We accidentally bent a push rod pulling the head of so I guess we are looking for a set of push rods and a head gasket kit. 
 

If anyone has push rods they would like to sell or knows a good source I would be interested. 
 

 

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