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| Defender 500
www.natvac.com | 800.253.5500
Defender 500
Vacuum Pump
Cause
Correction
Faulty lubrication
Check the lubrication
Oil missing
Re-fill the tank
RPM to high
Reduce RPM
Operation-time too long at
Stop the pump for a while and
high vacuum
let it cool down�
Clogged filters of “ballast port”
Thoroughly clean the filters
injection valves�
Cause
Correction
Drip-oiler/s badly adjusted
Adjustment as described
Oiler’s pin not sealing
Clean the related seat�
Cause
Correction
Broken vanes due to suction of
Dismount the pump and replace
damaged parts, foreign objects,
damaged parts� Check primary
or bad lubrication�
shut-off and lubrication system�
Frozen pump
Unfreeze the vacuum pump
Damaged drive system
Check and replace damaged
parts�
Flange bolts too tight
Loosen the bolts
TROUBLESHOOTING
Pump overheats
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Pump uses too much oil
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Pump doesn’t turn _______________________________________________