20412963
8-2012/Rev 07
6-1
SECTION 6
RECIRCULATION SYSTEM
6.1 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.
System components include the water modulating valve (oil-to-water models), recirculation
pump, heat exchanger, oil filter assembly and the hydraulic oil reservoir. A temperature/low
level switch, connected to the PLC, monitors temperature and oil level conditions in the hydraulic
oil reservoir and provides automatic shutdown protection.
Figure 6-1: Oil Recirculation Circuit
6.2 Operation (Oil-to-Water Models)
Cooling water is introduced through the 1/2-inch NPT connection on the rear 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.
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