Section 5
Recirculation System
20479279
9-2010/Rev 02
6-2
If the element is not replaced, and fills with debris, the bypass relief in the filter head will open to
prevent over pressurization. The relief valve opens at 50 psi (3.4 bar). When the valve opens, the
oil bypasses the filter and unfiltered oil is allowed to return to the reservoir.
The temperature/low level switch monitors the oil temperature and level in the reservoir.
NOTE
To conserve water usage it is recommended that the cooling water be shut off at
the end of the day. A sensor bulb from the modulating valve is submerged in the
reservoir. Even when the control power is off, the valve will remain open,
allowing water to flow until the oil is cooled.
5.3 Operation (Oil-to-Air Models)
The recirculation pump pulls oil from the hydraulic oil reservoir and sends it to the heat
exchanger. The oil-to-air heat exchanger controls heat build-up in the hydraulic oil. Oil
temperature can be visually monitored from a dual scale level/temperature sight gauge on the side
of the reservoir.
Figure 5-2: Recirculation System Components (Oil-to-Air)
The temperature switch mounted on the reservoir monitors the oil temperature and regulates the
air flow to the heat exchanger through a signal to the control panel to initiate power to the fan.
The cooled oil then passes through the filter element and returns to the reservoir.
The hydraulic oil filter assembly consists of the filter head, a filter element, pressure gauge,
bypass relief valve and the oil fill port. The filter element should be changed when the gauge
reads 40 psi (2.8 bar) at normal operating temperature.
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