20479279
9-2010/Rev 02
5-1
SECTION 5
RECIRCULATION SYSTEM
5.1 Overview
The oil recirculation circuit is a cooling and filtration system that provides properly conditioned
oil to the main hydraulic system. Hydraulic oil is maintained at the proper operating temperature
and condition by continuous recirculation.
5.2 Operation (Oil-to-Water Models)
Cooling water is introduced through the 1/2-inch NPT connection on the bulkhead of the
machine. A water modulating valve in the outlet line regulates the cooling flow through the heat
exchanger. The valve is factory set, but may require adjustment to maintain the operating oil
temperature at 115 F (46 C). Oil temperature can be visually monitored from a dual scale
level/temperature sight gauge on the side of the hydraulic oil reservoir.
Figure 5-1: Recirculation System Components (Oil-to-Water)
The recirculation pump pulls oil from the reservoir and sends it to the heat exchanger. The oil-to-
water heat exchanger controls heat build-up in the hydraulic oil. The plate style design allows
cooling water and oil to flow side by side through alternating plates.
The cooled oil then passes through the filter element and returns to the reservoir. The cooling
water either is discharged to the 1/2-inch NPT drain on the bulkhead or is routed to a customer
supplied water chiller.
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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