D-17 IV Hydraulic Change

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   Hi guys, first post so pardon the length: Trying to decide if I need to change hydraulic oil again....  Recently bought a '67 D-17 with loader. I don't have service manual. Guys told me when they sold it to me it had a leak so they just added oil each time they used it (which I don't think was often). After using it some, the leak was clearly just a worn disconnect. I changed it in five minutes and pressure was back.  
However, when i drained the fluid i only did so from the drain under the left foot clutch.. looking on this forum it sounds like there is a plug in the sump as well. (Would explain why only two gallons came out - which seemed way too few). Furthermore, the guy gave me what he said were Hyd filters, but after removing the current filter and trying to put it on, it doesn't fit. I think it's the engine oil filter. So, the old filter is back on as well. 

My questions are: Are there two plugs on a series IV? Would you drain the whole system again, change the filter and add fresh fluid?.. I'm telling myself (to justify saving money) that since they had a leak, they kept the fluid pretty fresh - but at the same time I don't know what they were putting in there so i might have a mix now. Also, what oil should I use if/when i drain it again?

Thanks!

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Jkhill1984 Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 27 Aug 2017 Location: New Glarus, Wis Points: 9	Post Options Post Reply Quote Jkhill1984 Report Post Thanks(0) Quote Reply Topic: D-17 IV Hydraulic Change Posted: 30 Aug 2017 at 9:17am
	Hi guys, first post so pardon the length: Trying to decide if I need to change hydraulic oil again.... Recently bought a '67 D-17 with loader. I don't have service manual. Guys told me when they sold it to me it had a leak so they just added oil each time they used it (which I don't think was often). After using it some, the leak was clearly just a worn disconnect. I changed it in five minutes and pressure was back. However, when i drained the fluid i only did so from the drain under the left foot clutch.. looking on this forum it sounds like there is a plug in the sump as well. (Would explain why only two gallons came out - which seemed way too few). Furthermore, the guy gave me what he said were Hyd filters, but after removing the current filter and trying to put it on, it doesn't fit. I think it's the engine oil filter. So, the old filter is back on as well. My questions are: Are there two plugs on a series IV? Would you drain the whole system again, change the filter and add fresh fluid?.. I'm telling myself (to justify saving money) that since they had a leak, they kept the fluid pretty fresh - but at the same time I don't know what they were putting in there so i might have a mix now. Also, what oil should I use if/when i drain it again? Thanks!

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DiyDave Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 11 Sep 2009 Location: Gambrills, MD Points: 54240	Post Options Post Reply Quote DiyDave Report Post Thanks(1) Quote Reply Posted: 30 Aug 2017 at 6:48pm
	Use universal hytran, it'll work in all compartments, IIRR. series 4 should have a unified compartment, but its possible that somebody rebuilt something, at some point in time, and put a seal in. There are at least 2 drain plugs, the 2 for hyd are real close together, in the area you described in your op. The rear end takes 80w90, IIRR...