Newbie 990 Selectamatic questions

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Amended 27/10/18

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ollek
Posts: 4140
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

Re: Newbie 990 Selectamatic questions

Post by ollek » Sun Jun 28, 2020 1:37 am

The needle is there to slow down and make the adjustment of the 3-point linkage lowering speed possible. The lowering speed will be as fast as possible if the needle is missing. This will not harm the Selectamatic system but can lead to damage to a heavy implement of lowered down to a hard surface. Please be careful when lowering a heavy implement connected to the lower links.

ALANJ
Posts: 68
Joined: Wed Oct 11, 2017 9:13 pm
Location: Co. Durham

Re: Newbie 990 Selectamatic questions

Post by ALANJ » Sun Jun 28, 2020 8:39 am

Further to correspondence on this subject , when you obtain the said rate of lowering valve you will find a free fitting annular collar around the needle shank. This ring prevents the needle being Inadvertently,totally unscrewed from the valve chest.
This means that when fitting the valve to the chest the two 1/2” bolts retaining the high pressure oil fitting to the chest must be slackened off and the fitting moved slightly to the right to allow the collar to locate in a recess in the rear of the fitting.
This task must be done with the linkage fully lowered and any external hydraulic rams fully depressurised to avoid high pressure oil splash.Also take care not to disturb the two “O” rings located in the front face of the chest.
Thank you for the kind comments. AJK.

mike_cullum
Posts: 9
Joined: Tue Jun 16, 2020 10:35 pm
Location: Norfolk

Re: Newbie 990 Selectamatic questions

Post by mike_cullum » Sun Jun 28, 2020 6:56 pm

Alan, I'm eally glad to hear that there is a retainer around the needle, this absolves me of my worries that I had accidentally fully unscrewed the needle while i was fiddling with all the controls when I first got the tractor...

Ollek, don't worry, if she has to be pressed into service before parts are obtained I shall exercise all caution!

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