WELCH-ILMVAC DUOSEAL 1374 User Manual

WELCH-ILMVAC DUOSEAL 1374

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WELCH-

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OWNER’S MANUAL FOR

DUOSEAL® VACUUM PUMP MODELS:

1374, 1374B-01, 1374B-10, 1374M-01, 1397, 1397B-01, 1397B-10,

1397B-80, 1397C-03, 1397J-01, 1397M-01, 1397W-01, 3Z657

WARNING

Never Block the Exhaust Port

If the exhaust is blocked, pressure will build up in the pump with the potential of

the oil reservoir bursting and causing possible injury to personnel in the area

Welch-Ilmvac

5621 W. Howard Street

Niles, IL 60714

Phone: (847) 676-8800 (Technical Support)

Fax: (847) 677-8606

E-Mail: gdwelchvacuum@gardnerdenver.com

Web-Page: www.welchvacuum.com

Part No. 67-2076

Printed in USA

SAVE THESE INSTRUCTIONS

Questions and Answers:

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Cathy HamiltonAug 4, 2025
Why is my WELCH-ILMVAC Water Pump producing excessive oil mist?
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  Bill RobinsonAug 5, 2025
  Excessive oil mist in your WELCH-ILMVAC Water Pump can occur due to several reasons. Maintaining the oil level between the two lines on the oil window during operation is crucial. System leaks or degassing can also cause this issue, so locate and seal any vacuum leaks. Additionally, contaminants in the oil can contribute to the problem, so perform a forced oil flush if contamination is found. If you have an oil mist eliminator, check the element and replace it if it's saturated with oil. Consider installing an oil eliminator to coalesce the oil mist from the exhaust gases.
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warneroscarAug 19, 2025
How to fix a noisy WELCH-ILMVAC DUOSEAL 1374 Water Pump?
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  Patricia WoodardAug 19, 2025
  A noisy WELCH-ILMVAC Water Pump can stem from several causes. Check for loose bolts on the motor mount and tighten them. The motor may need replacement. If the pulley is bent, replace it. Tighten a loose belt by loosening the bolts on the motor and moving the motor away from the pump until the belt exhibits a 1/2 inch deflection. If the vanes are sticking, perform a forced oil flush.

WELCH-ILMVAC DUOSEAL 1374 Specifications

General

Model	DUOSEAL 1374
Manufacturer	WELCH-ILMVAC
Type	Rotary Vane
Voltage	230 V
Inlet Port Size	16 mm
Outlet Port Size	16 mm

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