MTS Model 512-14 Hydraulic Power Unit - Manual (Page 23)

Reducing the Fluid Temperature
512.14 Hydraulic Power Unit Operation 23
Adjusting the Water Flow
On water-cooled heat exchangers, the water control valve regulates the flow of
water through the exchanger. MTS sets this valve to keep the hydraulic fluid
temperature between 64 and 68ºC (147 and 155ºF).
An out-of-adjustment water control valve can cause rapid overheating.
Check the Heat Exchanger
Changes in your water supply’s temperature may require adjustment of this
valve.
1. Start with the hydraulic fluid at room temperature. Make sure the heat
exchanger’s water supply valves are open.
2. Turn the start switch to LOW PRESS. Then turn the switch to HIGH
PRESS.
Put the HPU into a no-flow condition (where no fluid is flowing to other
hydraulic equipment).
3. Run the HPU for approximately 15 minutes to stabilize the temperature.
Check the fluid temperature in the sight glass.
• If the temperature is between 64 and 68ºC (147 and 155ºF), stop.
• If the temperature is
outside the operating
temperature range, turn
the valve’s screw to raise
or lower the water
temperature and repeat
this step. (Do not turn the
valve screw more than 1/2
turn at a time).
–Adjust the valve screw clockwise to decrease the reservoir
temperature.
–Adjust the valve screw counterclockwise to increase the reservoir
temperature.
Water Valve
1/2 Turn Maximum
Increase Decrease