Simon:
Hydraulic rams don’t normally need a permanently operating pump to keep them pressurised, unless there is a leak somewhere.
They have air rams, that’s why there’s electric compressor. Crappy design.
Reading this thread, there are several different trailer builders, each with there own ideas on how to do it. Or possibly how to copy a competitors method but change it enough so they don’t have to pay patent costs. Some may be hydraulic, some air, some using another alternative method altogether, some heated, some not, and so on.
We all seem to be able to learn something new (to us), here in this thread, provided we actually read it. What any of us do with that new information is entirely up to the individual.
Simon:
Hydraulic rams don’t normally need a permanently operating pump to keep them pressurised, unless there is a leak somewhere.
They have air rams, that’s why there’s electric compressor. Crappy design.
Reading this thread, there are several different trailer builders, each with there own ideas on how to do it. Or possibly how to copy a competitors method but change it enough so they don’t have to pay patent costs. Some may be hydraulic, some air, some using another alternative method altogether, some heated, some not, and so on.
We all seem to be able to learn something new (to us), here in this thread, provided we actually read it. What any of us do with that new information is entirely up to the individual.
Reason they use air rams is they wanted them to work without that electric power cable from the tractor, fine for road use but not for ferries.