MTS Model 512-04 Hydraulic Power Unit - Manual (Page 24)

Model 512.04 Hydraulic Power Unit 24 Maintenance
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).
If you have a water-cooled HPU, make sure both water supply valves are
open. 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 START/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. Let the HPU run. Wait 15 minutes for its temperature to stabilize.
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).
– Adjusting the valve screw counterclockwise increases the
reservoir temperature.
– Adjusting the valve screw clockwise decreases the reservoir
temperature.
Open Open
Water
(Out)
Water
(In)
1/2 Turn Maximum
Increase Decrease