If the vacuum pump is not achieving the expected level of vacuum within the receiver tank, check to ensure that all drain valves are closed. If all drain valves are closed, then check the oil level, oil quality and all filters on pump. Replace the oil and filters as needed. If this does not resolve the issue, please contact us for further technical assistance. Pumps should be overhauled periodically. Overhaul and filter kits can be purchased directly from Midland Technologies. Please have your pump model number ready when contacting us.
If the vacuum pump is not achieving expected vacuum levels in the die cavity, see the section above on troubleshooting Poor Cavity Fill as these are similar issues. We recommend placing vacuum gauges on either side of the filters in the system to monitor vacuum levels on the die cast machine side of the solenoid. You may also put a t-pipe at the vacuum block(s) and connect a gauge to monitor vacuum at the block when the solenoid is open.
Note that significant die leakage can introduce enough air to overcome the ability of the vacuum pump to achieve expected vacuum levels. For this reason it is critical to evaluate vacuum levels within the cavity by using the method of covering the pour hole described in the Poor Cavity Fill troubleshooting section above.