SECTION 10
RECIRCULATION SYSTEM
Jan 2003
p. 10-1
05148424
Section 10 RECIRCULATION SYSTEM
10 Recirculation System
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 tank, 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 oil tank
• 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 (1) takes oil from the tank (6) and pumps it to
the oil to water heat exchanger (3), then to the oil filter (5) and back to
the tank.
Condition of the hydraulic filter is determined by analyzing gage
pressure. It should be read when both the water jet pump is running and
the oil temperature is approximately 115°F. Oil fill port must be used
when pumping oil into tank to assure cleanliness. By filling at this
point, the hydraulic oil must pass through the hydraulic filter to get to
the hydraulic tank, guaranteeing that the oil into the tank gets at least
one pass through a good filter.
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