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Hydraulic drive motor for a 1974 646

9.5K views 24 replies 12 participants last post by  mawalker3733  
#1 ·
I don't want to pay for a new one. $$$$$$$$.... can still get parts for them or can I get a used one
 
#8 ·
Correctly me if I am wrong, but don't pretty much ALL of the tractors use the same hydraulic motor and rear ends? Yes, small wheels have 5 bolt axle shafts and hubs and large wheel and loaders have 6 bolt axles and hubs.

I checked the books, and the 76 - 446 parts tractors I picked up at auction for $150 has the SAME hydro motor and rear end under it that my 73 - 646 has.. Part number for the motor in all the manuals I have is C 14655..

So, IMHO, if you blew the motor, find a parts tractor of about any model for cheap and swap parts....

I already had to steal the steering wheel off the parts tractor for the 646, that saved me $75 right there.
 
#10 · (Edited)
Years ago on the old Yahoo group They said the 2xx H motor turned faster than the 4xx to make up for the size difference of the tires. And that Case made a few 2xx Torque models with the 4xxH motors, the ran slower but put more torque to the ground.

:cheers:
Gordy

PS; My local CI dealer (retired) told me to be careful on getting a H motor. As some of them had fine spines and some have coarse splines on the shaft.
 
#15 ·
FYI: if you have a motor separate from the case and don't know which it is, just measure the main motor case. The 2xxs are shorter than the 4xx motors. that is what changes the displacement and speed. I don't recall the length, but at least you can compare to a known motor.
 
#23 ·
Be aware, pre 74 motors mount at an angle off vertical(about -30 degree's I think, would like feed back if anyone knows actual angle), while newer mount vertically. I am in process of rebuilding a 72 646 and the new engine mount for the lovejoy/motor does not match the motor I removed. BTW-I went with a new replacement and it was expensive, about $500, as I remember.
Marty in Green Bay, WI
 
#24 ·
Thanks for that information, I saw a 222 for sale on craigslist and thought it may be a desirable spare. I currently have my engine out apart and at the machine shop. Compression was 105 on the right and 95 on the left. It smoked and had no power. It's a cck engine, heavy old dog with std pistons. Bores looked great, engine was filthy . The guy I bought it from last year said he replaced the bolts in the rear end and he stretched the frame 6", but he didn't want to fool around with the engine, So I finally "pulled the pin"and pulled out the engine. (Tried to use it in the last deep heavy wet snowstorm) it didn't have any power and just spun the wheels. I had summer oil in the hydraulics, and no chains. I've since bought a set of chains from case mike, and figured I'd refresh the engine. I pulled the quadrant gear and pinion last summer and tightened that up with a new bushing in the pinion and new brass thrust washers, I fabbed up a three point hitch and used the lower arm and links from Agri Supply, removed the midlift cylinder and hooked up the lines to the three point. Now as long as the engine is out and all the tin is off the front, I started on the "poor mans power steering" upgrade today. (Just. Ordered the thrust bearing and washers from McMaster - Carr.) I'm hoping the refreshed engine runs as good as it did before the tear-out. (It started great and ran good) just smoked allot and used oil. It's a fun machine, I can see why they are desirable and don't pop up for sale that often. (I believe mine is a 1975 646). Gary C