Heat Exchangers – are used to remove the heat from the fluid. Typically either oil-to-air or oil-to-water are utilized. Oil-to-water is most efficient however requires large quantities or water, or local cooling tower.
Oil-to-air is becoming most common today as it is environmentally friendly, requires no water or coolant additives, and is readily available. The downside is on particularly high thermal systems they can become quite large and noisy.
Filters – are used to clean the fluid of carbon particles produced by heating the fluid, and impurities getting into the system. Commonly used are screw on filters for quick change out and low cost. Strainers are also included in the tank to catch larger particles.
Pressure Switch – is used to monitor the fluid pressure going into the brake. It is typically wired to the prime mover to stop the operation with a loss of pressure meaning fluid is not flowing to the brake.
Over Temperature Switch – Usually wired into an alarm system or light to warn of fluid temperature exceeding operating levels.
Fluid Reservoir – is used to hold the transmission fluid long enough to settle any sediment, and allow aeration to dissipate.
Kidney Filtration System – This is an external filtering system that includes a small pump and motor continuously circulating a portion of the fluid through a filter system. This allows use of smaller filters on very large systems. In addition it is used for draining and re filling the reservoir were a complete fluid change needed. New fluid put into the reservoir if filtered assuring clean fluid in the brake system.
Actuation System – When hydraulic actuation is used for the brakes the actuation pump can be located on the reservoir of the forced lube cooling unit using the same fluid.
Multiple Brakes on One Cooling Unit – When operating more than one brake from a single reservoir it is critical that a separate cooling fluid pump system be used for each brake.
Internal fluid heaters – Sometimes it is necessary to heat the fluid before operating. The fluid should be near 100 degrees F for best operation.