MTS Model 512-01 Hydraulic Power Unit - Manual (Page 20)

Model 512.01 Hydraulic Power Unit 20 Maintenance
Reducing the Fluid Temperature
The hydraulic power unit (HPU) will be shut down if the hydraulic fluid
reaches a temperature of 55°C (130° F).
1. Check the thermometer. The HPU shuts down when fluid gets hotter
than about 55ºC (130ºF).
2. Press the Start button. Hold it down to override the overtemperature
sensor.
• If overtemperature fluid caused the shutdown, the HPU will now
start to run.
• Keep holding the Start button until the HPU stays running when
you let go of this button. This could take several minutes.
If the HPU still does not run, something else caused the shutdown.
3. Once the HPU is running, put the HPU in a no-flow condition (where
no fluid is flowing to other hydraulic equipment).
4. Let the HPU run. Wait 15 minutes for its temperature to stabilize.
Check the fluid temperature.
If the temperature is between 43 and 52ºC (109 and 126ºF), stop.