Trace that leak with ultra-violet lamp
TRACTOR oil, hydraulic and water leaks are all detectable using an ultra-violet (UV) leak finding system, already used in the automotive industry.
When added to a faulty cooling/hydraulic circuit, the Primalec Glo-Leak liquid makes the escaping coolant/lubricant fluoresce as bright yellow-green under ultra-violet light. So if the leak is "travelling" along pipework etc and then dripping, it can easily be traced back to its source using a special UV lamp.
Price of the basic kit, which includes the lamp, starts at £115 (01474-854417).