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Subject: 8n lift is slow to lower

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Model660    Posted 08-15-2017 at 20:02:52 [URL] [DELETE]        [Reply] [No Email]  
  • 8n lift is slow to lower
  • Hello, I'm working on a 48 8n with a slow lowering lift. New mineral type oil . Life has been rebuilt . Goes up great. Any ideas appreciated.

    BlasterStumps    Posted 08-15-2017 at 23:25:57 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8n lift is slow to lower
  • Control valve not moving as it should?

    K.LaRue-VA    Posted 08-15-2017 at 22:52:05 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n lift is slow to lower
  • If it's slow with no implement on the arms, that may be normal. Not a lot of weight for gravity to work with if there is no implement on there.

    Bruce (VA)    Posted 08-15-2017 at 21:39:38 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8n lift is slow to lower
  • What part of the "lift" was rebuilt? The top cover or the pump? Or both? What parts were replaced?

    Model660    Posted 08-16-2017 at 16:55:21 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n lift is slow to lower
  • New cylinder, piston , linkage tightened up, new follower pin. The pump was took apart and checked and found to be in good shape. I didn't take the control valve out to check it because the lift linkage was so worn , I figured that was the problem. Put it back together and it worked great. Six months pass and the lift was doing strange things, keeps going up even when you stop raising the handle in position . Draft works fine. I worked the control valve by hand on the pump and position works good now,just is real slow going down

    JMOR    Posted 08-17-2017 at 09:42:27 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n lift is slow to lower
  • There is not "a" control valve, but rather, two. One controls lift and the other controls lowering. Called intake control and exhaust control valves. Openings in valve bushings could be clogged or valve sticking.

    JMOR    Posted 08-17-2017 at 09:41:11 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n lift is slow to lower
  • There is not "a" control valve, but rather, two. One controls lift and the other controls lowering. Called intake control and exhaust control valves. Openings in valve bushings could be clogged or valve sticking.

    Model660    Posted 08-17-2017 at 16:53:45 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n lift is slow to lower
  • Can the lowering valve be removed without dropping the pump? If not, can the pump be dropped without removing the liftcover? I've did most of my tinkering on newer jubilees,600 and 801s. 8ns are not familiar to me. Thanks to all that are helping me on this.

    JMOR    Posted 08-18-2017 at 04:43:42 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n lift is slow to lower
  • You may be able to remove lowering (exh) valve with pump installed, but even if possible, the working space will make it difficult, plus not easy to be sure ports in bushing are clear. Pump can be dropped without top cover removal as I have done that.

    Model 660    Posted 08-19-2017 at 15:49:48 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n lift is slow to lower
  • I pulled the lift cover to check linkage and found some of that to be sloppy. Got that tightened up.and also removed the raise and lower valves. Does the lower valve have a spring behind it? This one didn't . I stretched the spring on the raise valve a little. To help push it back to neutral when you set the handle in position control. Hopefully won't have to drop pump. Even the pivot pin between the raise and lower valves was sloppy. No sense in a 70 year old tractor being this worn out 🙂

    Model660    Posted 08-16-2017 at 16:58:02 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n lift is slow to lower
  • I put the tsc mineral type gear/hydraulic oil in it. I just wonder if the 134 type would be better. The oil seems real thick

    Bruce (VA)    Posted 08-17-2017 at 08:34:14 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8n lift is slow to lower
  • Put a heavy implement, like a disc , on it & see what happens.

    The oil isn't an issue unless it's really cold outside. If you used the TSC oil that says it meets the 134 spec, you won't even have that problem.

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