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74R & 75R SERIES

ROCKING PISTON OIL-LESS PUMPS

O

PERATION

& M

AINTENANCE

M

ANUAL

Product Use Criteria:

• Pump only clean, dry air.
• Operate at 32

º

F - 104

º

F (0

º

C - 40

º

C).

• 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.  

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 - 6850 G496PL  (REV-D) 

Model 74R Shown

Model 75R6 Shown

Summary of Contents for 74R

Page 1: ...must be filtered out Consult your Gast Distributor Representative before using at high altitudes This pump is oil less and requires NO lubrication 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 ...

Page 2: ...any 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 The product s external intake and exhaust muffler will provide adequate filtration in most applications Check filters periodically and replace when necessary Consu...

Page 3: ...em or an equipment grounding terminal or lead on the product Power supply wiring must conform to all required safety codes and be installed by a qualified person Check that supply voltage agrees with that listed on product nameplate Extension cords Use only a 3 wire extension cord that has a 3 blade grounding plug Connect extension cord plug to a matching 3 slot receptacle Do not use an adapter Ma...

Page 4: ...ollow proper shutdown procedures to prevent product damage NEVER ADD OIL TO THIS OIL LESS PUMP Proper shutdown procedures must be followed to prevent pump damage Failure to do so may result in premature pump failure Gast Manufacturing Rocking Piston Oil Less Pumps are constructed of ferrous metals or aluminum which are subject to rust and corrosion when pumping condensable vapors such as water Fol...

Page 5: ...responsible for freight charges both to and from Gast in all cases This warranty does not apply to electric motors electrical controls and gasoline engines not supplied by Gast Gast s warranties also do not extend to any goods or parts which have been subjected to misuse lack of maintenance neglect damage by accident or transit damage THIS EXPRESS WARRANTY EXCLUDES ALL OTHER WARRANTIES OR REPRESEN...

Page 6: ...1 AP119 AT275 12 RETAINER SCREWS 2 AT283 AT283 13 RETAINER PLATE 1 AT715 AT566A 14 PISTON CUP 1 AT329 AT280 15 FAN 1 AP108A AP108A 16 GRILLE SHROUD 1 AP107A AP107A 17 VALVE PLATE ASSEMBLY 1 AP102A AP102A 18 FILTER 1 B300A B300A SERVICE KIT 1 K806 K806 EXPLODED PRODUCT VIEW PARTS ORDERING INFORMATION 74R shown Item not shown Denotes parts included in the Service Kit Parts listed are for stock model...

Page 7: ...3 13 RETAINER PLATE 2 AT566A 14 PISTON CUP 2 AT280 15 FAN 1 AP108A 15A FAN LEAD END 1 AP108 16 GRILLE SHROUD 1 AP107 17 O RING 4 AK846 18 TUBE 2 AP125A 19 VALVE PLATE ASSEMBLY 2 AP102A SERVICE KIT 1 K797 EXPLODED PRODUCT VIEW PARTS ORDERING INFORMATION Underside View 75R shown Item not shown Denotes parts included in the Service Kit Parts listed are for stock models For specific OEM models please ...

Page 8: ...ck power source Voltage wrong Check power source Worn cup piston hitting cylinder Replace Cylinder misadjustment Realign Leaky hose or check valve Replace Dirt or liquid on top of piston Inspect and clean Motor not wired correctly Check wiring diagram line voltage Blown head gasket Replace TROUBLESHOOTING CHART www gastmfg com ISO 9001 14001 CERTIFIED PART NO 70 6850 G496PL REV D World Headquarter...

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