Manual - Formech 450DT V1.0 - 0317
33
Vacuum / Pressure Troubleshooting (continuation)
The possible causes of poor vacuum are:
• The mould baseboard is restricting the vacuum hole in the table.
• NOTE: If the mould baseboard is too soft it may pull down under vacuum and block the vacuum hole.
• The mould is inadequately vented to allow trapped air to be evacuated.
• The table and clamp seals are in poor condition or the table is not locking properly at the top of its travel.
• There are holes drilled in the table.
If all the above points are OK and you can hear the pump running when operated, then one of the following
points may be the cause of the problem. If the pump does not run, refer to the Electrical trouble shooting
section above.
• A pipe is loose, disconnected, damaged or blocked.
• The pump fi lter is blocked.
• The vacuum valve is blocked or not operating.
• The vacuum pump is blocked or faulty.
If the heater has been left in the forward position, with no plastic in the clamp frame, the table will start
to overheat. The pipe attached to the back of the table will shrink and constrict the passage of air. Pipes
become less fl exible over time and may loosen or crack.
If the Vacuum pump is running but there is no vacuum or very poor vacuum measured at the pump then it
may require maintenance. The Pump is a twin head diaphragm type. Each head consists of a diaphragm
valve confi guration operated by the motor. After considerable use the valve membranes and top washer may
become worn or damaged. Access to these parts is by disassembly of the pump heads.
The following provides drawings and parts data to assist with the maintenance and repair of the diaphragm
pump. Simply disassemble, inspect, replace parts if required and reassemble.
Service / Repair
