SECTION 10
RECIRCULATION SYSTEM
Jan 2003
p. 10-1
05130497
Section 10 RECIRCULATION SYSTEM
10 Features
The recirculation system keeps the hydraulic oil at operating
temperature while using the minimum amount of cooling water flow. The
system also provides the necessary oil conditioning and filtration to
maintain oil cleanliness. The conditioning of the hydraulic oil includes
cooling it, cleaning it, and together with the hydraulic reservoir, removing
air bubbles entrained in the oil due to agitation and turbulent flow in the
main pump circuit.
10.1 Components
The cooling and filtration system (recirculation system)
is equipped with
the following:
• Recirculation pump (gear-type)–which receives oil from the hydraulic
reservoir
• Heat exchanger - cooling water is controlled by the water modulating
valve
• Oil filter assembly - includes a gage to show the filter element
condition. It also includes a bypass or relief valve, should the filter
element be allowed to become entirely clogged with
dirt/contaminants.
10.2 Operation
The recirculation pump takes oil from the hydraulic reservoir and pumps
it to the oil- to- water heat exchanger, then to the oil filter and back to
the reservoir.
Condition of the hydraulic filter is determined by analyzing gage
pressure. Hydraulic oil is pumped into the reservoir through a tee fitting
near the top of one end of the reservoir. On the 15 hp SL-IV fill oil
entering the reservoir does not pass through the filter. Use of an oil
filter/ transfer cart for filling is recommended to assure fluid cleanliness.
Operating Temperature Adjustment
The operating temperature is adjusted by turning the water modulating
valve (19) adjusting knob with a flat blade screwdriver. Clockwise
increases the oil temperature.
The water modulating valve regulates the cooling flow that enters the
heat exchanger (6) and then discharges to the drain.
The operating oil temperature is factory set at 46°C (115°F) based on the
temperature and flow of cooling water at the factory. Field adjustment
may be necessary.
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