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LABORATORY OIL-LESS DIAPHRAGM

VACUUM PUMP & COMPRESSOR

O

PERATION

& M

AINTENANCE

M

ANUAL

Product Use Criteria:

• Pump only clean, dry air.
• Operate at 32ºF - 104ºF (0ºC - 40ºC).
• Protect unit from dirt & moisture.
• Do not pump flammable or explosive gases or

use in an atmosphere that contains such gases.

• Protect all surrounding items from exhaust air.  This

exhaust air can become very hot.

• Corrosive gases and particulate material will

damage unit.  Water vapor, oil-based contaminants
or other liquids must be filtered out.

• Consult your Gast Distributor/Representative

before using at high altitudes.

• This pump is oil-less and requires NO lubrication.
• Laboratory units may be used for both pressure and vacuum.

IMPORTANT: PLEASE READ THIS MANUAL AND SAVE FOR FUTURE REFERENCE.

Thank you for purchasing this Gast product.  It is manufactured to the highest standards

using quality materials.  Please follow all recommended maintenance, operational

and safety instructions and you will receive years of trouble free service.

www.gastmfg.com

ISO 9001 & 14001 CERTIFIED

®Registered Trademark/™Trademark of Gast Manufacturing Inc., Copyright © 2002 Gast Manufacturing Inc.  All Rights Reserved.

PART NO. 70 - 5105 G471PL (Rev A)

Model DOA-P704 Shown

1

Summary of Contents for Gast DOA Series

Page 1: ... Consult your Gast Distributor Representative before using at high altitudes This pump is oil less and requires NO lubrication Laboratory units may be used for both pressure and vacuum IMPORTANT PLEASE READ THIS MANUAL AND SAVE FOR FUTURE REFERENCE Thank you for purchasing this Gast product It is manufactured to the highest standards using quality materials Please follow all recommended maintenanc...

Page 2: ...y way can cause the product to overheat Mounting This product can be installed in any orientation Mounting the product to a stable rigid operating surface and using shock mounts will reduce noise and vibration INSTALLATION Accessories Filters and mufflers are supplied with some models These should be checked periodically and replaced when necessary An optional liquid trap should be installed betwe...

Page 3: ...cal codes and ordinances Grounded Plug Grounding Pin Grounded Outlet 120 volt grounded connectors shown 220 240 volt grounded connectors will differ in shape G Model that is permanently wired This product must be connected to a grounded metallic permanent wiring system or an equipment grounding terminal or lead on the product Power supply wiring must conform to all required safety codes and be ins...

Page 4: ...fore handling Air stream from product may contain solid or liquid material that can result in eye or skin damage wear proper eye protection Clean this product in a well ventilated area Failure to follow these instructions can result in burns eye injury or other serious injury WARNING Check intake and exhaust filters after first 500 hours of operation Clean filters and determine how frequently filt...

Page 5: ...PRESSLY DISCLAIMS ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE OR PURPOSE WITH RESPECT TO THE GOODS SOLD THERE ARE NO WARRANTIES WHICH EXTEND BEYOND THE DESCRIPTIONS SET FORTH IN THIS WARRANTY notwithstanding any knowledge of Gast regarding the use or uses intended to be made of goods proposed changes or additions to goods or any assistance or suggestions that may have been made...

Page 6: ...AF809 16 DIAPHRAGM 1 AF818A AF818A 17 FELT SPACER 3 AA929 AA929 18 SPACER 1 AD996 AD996 19 FAN 1 AT837 AT837 20 GRILLE 1 AF807 AF807 21 RUBBER FOOT 4 AF584A AF584A 22 POWER CORD 1 AE941 AG320 23 REAR COVER 1 AF805B AG954 24 VALVE PLATE ASSEMBLY 1 AP519 AP519 25 RETAINER PLATE SCREWS 2 BB557 BB557 SERVICE KIT 1 K294J K294K DOA SERIES Please reference the exploded view on the next page for the follo...

Page 7: ...EXPLODED PRODUCT VIEWS MODEL DOA VALVE PLATE ASSEMBLY Valve Plate Assembly available separately Valve Plate Assembly also includes items 10 13 not shown 7 ...

Page 8: ...lves bent Clean or replace Worn diaphragm Repair or replace Relief valve set too high Inspect and adjust Relief valve set too low Inspect and adjust At pump At pump Plugged vacuum pressure line Inspect and repair At pump Collapsed vacuum line Inspect and repair Low voltage won t start Check power source Voltage wrong Check power source Worn diaphragm Replace Leaky hose or check valve Replace Dirt ...

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