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Classic Machinery
MF148 hydraulics...
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<blockquote data-quote="Cowabunga" data-source="post: 9253206" data-attributes="member: 718"><p>On another tack. Vicon single acting ram to open the orifices has a gas accumulator return spring. This is a very strong spring, certainly when new and most cheap spool valves are not ‘zero leak’. This means that the accumulator tries to open the hopper exists at all times and oil pressure from the tractor keeps it closed. Unfortunately most cheap spool valves, including two out of three types fitted by MF from the factory, do leak back internally, which results in the hopper holes opening themselves at a significant rate [by the time you have travelled half a mile from yard to field] unless you keep pulsing the spool lever to maintain pressure in its pipes and ram every minute or two. </p><p>The good news is that with a Vicon, you will only fill the bowl to which the spout is attached, not run an expensive trail of fertiliser along the road as some spreaders would do.</p></blockquote><p></p>
[QUOTE="Cowabunga, post: 9253206, member: 718"] On another tack. Vicon single acting ram to open the orifices has a gas accumulator return spring. This is a very strong spring, certainly when new and most cheap spool valves are not ‘zero leak’. This means that the accumulator tries to open the hopper exists at all times and oil pressure from the tractor keeps it closed. Unfortunately most cheap spool valves, including two out of three types fitted by MF from the factory, do leak back internally, which results in the hopper holes opening themselves at a significant rate [by the time you have travelled half a mile from yard to field] unless you keep pulsing the spool lever to maintain pressure in its pipes and ram every minute or two. The good news is that with a Vicon, you will only fill the bowl to which the spout is attached, not run an expensive trail of fertiliser along the road as some spreaders would do. [/QUOTE]
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MF148 hydraulics...
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