MTS Model 512-14 Hydraulic Power Unit - Manual (Page 22)

512.14 Hydraulic Power Unit 22
Reducing the Fluid Temperature
Operation
Adjusting the Air Flow
Air-cooled heat exchangers use louvers to control airflow through the exchanger.
You may have to adjust them to keep the fluid’s temperature between 64 and 68ºC
(147 and 155ºF).
Adjust the Louvers
Make sure the louvers are fully open.
1. Turn the start switch to LOW PRESS and
hold it there to override the shutdown.
If overheated fluid caused the shutdown,
the HPU will now start to run.
Keep holding the start switch to LOW
PRESS until the HPU stays running when
you let go of this switch. (It can take up to
two hours for the fluid to cool down if you
do not run the HPU.)
If the HPU still does not run, some other
condition has caused the shutdown.
2. Set the HPU’s output to HIGH PRESS. Put the HPU in a no-flow condition
(no fluid flowing to other hydraulic equipment).
3. Let the HPU run for 15 minutes to stabilize the fluid temperature. Check the
fluid temperature in the sight glass.
• If the temperature is between 64 and 68ºC (147 and 155ºF), stop.
• If not, open or close the louvers as needed and repeat this step.
Adjust
START
LOW
PRESS.
HIGH
PRESS.
hold