[frmhrt]

I have a 1949 ford f5 truck my dad bought new. He installed an after market dump hoist and box. I need to find specs and manual on the dump hoist but cannot find a brand or marking on the unit, except the lever to engage the pump is labeled "Chelsea" and the valve lever is labelled "Schwartz valve".

Anyone have an idea of what this is or how I can get information to service the hoist?
thx much
alan