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In Reply to: Re: 340 farmall hydralic problems! posted by rod on Sunday, January 06, 2008:
Rod: I'm a farmer, I do quite well on tractors I've owned as well as general question common to all. I never had a 340, however I do understand they are a bit unusual for IH as there was two hydraulic systems offered. I think the only difference is there were two different pumps offered. The other change is when IH moved from 30-50 series to 40-60 series hydraulics changed.
Proir to 1958 all pumps on all sizes of tractors were driven off timing gears and mounted between timing gears and distributor and those tractors had a reservoir separate from transmission. From 1958 onward the 140 and 240 remained much the same as 130 and 230. The 460 and 560 used the transmission and rearend as the hydraulic reservoir. The pump was mounted in the torque tube and driver off the IPTO driveline going to rear of tractor. Basically a submersable pump. Some 340 were exactly the same as the 460 and 560 with pump in the torque tube and apparently that was an option on the 340. Standard equipment was a pump driven off the timing gears, same as 140 and 240. I assume IH designed the rest of it same as 460 and 560. This is why I suggested putting tractor on the steep down grade. If they are using rearend transmission for reservoir, that places pump above reservoir. We quite often had to do point them downhill with older tractors like 300, 200, SA, 130, 140, etc. and their reservoir was close to level with pump. Problem occurs after the system has been drained, if one gets air between reservoir and pump, sometimes it takes a wee bit of graviety and bleeding of air at pump to make that oil flow. Add to that the filter, it is on the suction side of pump between pump and reservoir, and if the filter is plugged or close to it, that adds to the problem of getting oil moving to the pump. Most experts frown on flushing a system, other than the reservoir. Those products are hard on pumps and valves. A live hydraulic pump is much like a heart, it can't run out of the prescribed fluid, other than one can shut the tractor off. Try not to run the tractor anymore than you have to until you get hydraulic oil to that pump.
If your 340 uses rearend and transmission as hydraulic reservoir very likely the capacity is somewhere between 12 and 15 gallons. I know the 560 is 17 gallons, but that chassis is larger than the 340. If it uses some other tank as a reservoir, I have no idea what the capacity will be.