Specifications

Dekker Vacuum Technologies, Inc. – DuraVane/12 19
11. Check to see if inlet check valve assembly is stuck in closed position due to contamination. Disassemble and
clean inlet check valve and screen as required.
12. Check back-pressure on pump. Exhaust element may need to be replaced. Refer to Installation and
Operations manual for maximum pressure and replacement instructions.
13. Internal parts may be worn or damaged. Contact authorized dealer.
14. One or more of the vanes in the rotor may be stuck. Contact authorized dealer.
Unit is not reaching ultimate vacuum level: (DuraVane Lubricated)
1. Stop unit and disconnect power.
2. Check vacuum gauge. Gauge may be faulty. Replace.
3. Check oil level. Oil level should be maintained at the middle of the top sight glass on the side of the pump
reservoir.
4. Check oil for excessive foaming. If foaming, replace.
5. Check to see if the oil is contaminated or varnished. Replace at once.
6. If the oil has been used longer than the recommended life expectancy (as specified in the Maintenance
Schedule in the Installation and Operations Manual), the pump will not draw ultimate vacuum. Allow pump to
cool before changing oil.
7. Check to see if system is holding vacuum. This can be done by shutting the unit down and observing for
about 30 minutes if the gauge on the receiver or pipe system is holding. If vacuum is not holding, check all
pipe connections for leaks using conventional leak detection methods.
8. Check to see if inlet screen and inlet filter (if installed) is blocked. If blocked, clean wire screen and filter
element and reinstall or replace. If an inlet filter has not been installed, and the problem persists, install an
inlet filter. Refer to Installation and Operations manual.
9. Check to see if inlet check valve assembly is stuck in closed position due to contamination. Disassemble
and clean inlet check valve and screen as required.
10. Check around pump for oil leaks. Oil tubing may be damaged or defective. Replace and/or tighten fittings
as needed.
11. Internal parts may be worn or damaged. Contact authorized dealer.
12. Check pump model and specifications. Pump may not be suitable for application. Consult authorized dealer.
OVERHEATING AND SMOKING PROBLEMS
Overheating problems: (DuraVane Lubricated)
1. Stop unit and disconnect power.
2. Check to see if the oil is contaminated or varnished. Replace at once.
3. Check hour meter (if installed). Oil should not be used longer than the recommended life expectancy (as
specified in the Maintenance Schedule in the Installation and Operations Manual). Allow pump to cool before
changing oil.
4. Check oil level. Oil level should be maintained at the middle of the top sight glass on the side of the pump
reservoir.
5. Check oil for excessive foaming. If foaming, replace.
6. Check oil-return valve inside pump. Valve may be clogged or may be functioning incorrectly. Contact
authorized dealer.
7. Check back-pressure on pump. Exhaust element may need to be replaced. Refer to Installation and
Operations manual for maximum pressure and replacement instructions.
8. Make sure that pump is being cooled correctly. Check that pump is located in a well-ventilated area.
Maximum ambient temperature for the rotary vane vacuum pumps is 100
o
F. All standard pumps are air-
cooled.
9. Inspect fan for damage.
10. Clean motor and pump air grills if needed.
11. Check heat-exchanger, clean if necessary.
Unit smokes at the exhaust side: (DuraVane Lubricated)
1. Stop unit and disconnect power.
2. Check back-pressure on pump. Exhaust element may need to be replaced.
3. Check internal exhaust element. Exhaust element may not be seated correctly with o-ring or may need to
be replaced. Refer to Installation and Operations manual for maximum pressure and replacement
instructions.
4. Check operating temperature. Excessive heat will cause smoking.
5. Check oil-return valve inside pump. Valve may be clogged or may be functioning incorrectly. Consult
authorized dealer.
6. Check oil return line. Line may be clogged or broken. If so, clean clogged line or replace line. Be sure to
use same size line when replacing. Consult authorized dealer.
NOISE AND VIBRATION PROBLEMS:
Unit is making excessive noise: (DuraVane Lubricated)
1. Check oil for excessive foaming. If foaming, replace.