GAST LUBRICATED 65 SERIESPART NO. ROTARY70-500 (Rev. H)
VANE VACUUM PUMPS &
COMPRESSORS
OPERATION & MAINTENANCE MANUAL
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.
WARNING
PLEASE READ THIS MANUAL COMPLETELY BEFORE INSTALLING AND USING THIS MOTOR. SAVE THIS MANUAL FOR FUTURE REFERENCE AND
KEEP IN THE VICINITY OF THE MOTOR.
Product Use Criteria:
•Operate at 32ºF - 104ºF (0ºC - 40ºC).
•Protect unit from dirt & moisture.
•Protect all surrounding items from hot exhaust air. This exhaust air can become very hot.
•Product is not a consumer product and is for commercial applications only.
•Do not pump flammable or explosive gases or use in an atmosphere that contains such gases.
•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.
•Use Gast #AD220 or a detergent SAE#10 automotive engine oil for lubricating.
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®Registered Trademark/™Trademark of Gast Manufacturing Inc., Copyright ©2003 Gast Manufacturing Inc. All Rights Reserved.
Your safety and the safety of others is extremely important.
We have provided many important safety messages in this manual and on your product. Always read and obey all safety messages.
This is the safety alert symbol. This symbol alerts you to hazards that can kill or hurt you and others. The safety alert symbol and the words “DANGER” and “WARNING” will precede all safety messages. These words mean:
DANGER
You will be killed or seriously injured if you don’t follow instructions.
WARNING
You can be killed or seriously injured if you don’t follow instructions.
All safety messages will identify the hazard, tell you how to reduce the chance of injury, and tell you what can happen if the safety instructions are not followed.
INSTALLATION
WARNING
c 
Electrical Shock Hazard
Disconnect electrical power at the circuit breaker or fuse box before installing this product.
Install this product where it will not come into contact with water or other liquids.
Install this product where it will be weather protected.
Electrically ground this product.
Failure to follow these instructions can result in death, fire or electrical shock.
Correct installation is your responsibility. Make sure you have the proper installation conditions and that installation clearances do not block air flow. Proper guards should be installed to prevent contact with moveable parts of this pump. Do Not lift the unit by the fan shroud. Unit is to be lifted by means of eyebolts.
Blocking air flow over the product in any way can cause the product to overheat.
Mounting
Mounting the product to a stable, rigid operating surface and using shock mounts will reduce noise and vibration.
Plumbing
To prevent air flow restriction, use pipe and fittings that are the same size or larger than the threaded ports of the pump. The ports are marked "IN" and "OUT". If the distance is great, use lines with a larger diameter than the connections. Give lines a uniform slope, place drain cock at low point, and avoid extra elbows. For ease of servicing, use a union or hose with clamps near the pump (a hose helps eliminate noise and vibration). If a vacuum/pressure supply tank is used, slope the line towards tank, provide a drain at the bottom, and place a check valve between the tank and pump so the pump will not run backwards when turned off.
Accessories
Intake and exhaust filters are external to the pump and will provide adequate filtration for most applications. Check filters periodically and replace when necessary. Consult a Gast Representative for additional filter recommendations. Install relief valves and gauges at the inlet or outlet, or both, to monitor performance. Check valves may be required to prevent backstreaming through the pump.
Motor Control
It is your responsibility to contact a qualified electrician to assure that the electrical installation is
adequate and in conformance with all national and local codes and ordinances.
Determine the correct overload setting required to protect the motor (see motor starter manufacturer’s recommendations). Select fuses, motor protective switches or thermal protective switches to provide protection. Fuses act as short circuit protection for the motor, not as protection against overload. Incoming line fuses help to withstand the motor’s starting current. Motor starters with thermal magnetic overload or circuit breakers protect motor from overload or reduced voltage conditions.
The wiring diagram supplied with the product provides required electrical information. Check that power source is correct to properly operate the dual-voltage motors.
Electrical Connection
Grounded Plug |
Grounding Pin |
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120-volt grounded connectors |
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shown. 220/240-volt grounded |
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connectors will differ in shape. |
Grounded Outlet |
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2
Model with a power supply cord:
This product must be grounded. For either 120-volt or 220/240-volt circuits connect power supply cord grounding plug to a matching grounded outlet. Do not use an adapter. (See DIAGRAM A)
In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the electric current. This product may be equipped with a power supply cord having a grounding wire with an appropriate grounding plug. The plug must be plugged into an outlet that is properly installed and grounded in accordance with all local codes and ordinances.
Check with a qualified electrician or serviceman if the grounding instructions are not completely understood, or if you are not sure whether the product is properly grounded. Do not modify the plug provided. If it will not fit the outlet, have the proper outlet installed by a qualified electrician.
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 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. Make sure your extension cord is in good condition. Check that the gage wire of the extension cord is the correct size wire to carry the current this product will draw.
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Minimum gage for extension cords |
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Amps Volts |
Length of cord in feet |
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120v |
25 |
50 |
100 |
150 |
200 |
250 |
300 |
400 |
500 |
240v |
50 |
100 |
200 |
300 |
400 |
500 |
600 |
800 |
1000 |
0-2 |
18 |
18 |
18 |
16 |
16 |
14 |
14 |
12 |
12 |
2-3 |
18 |
18 |
16 |
14 |
14 |
12 |
12 |
10 |
10 |
3-4 |
18 |
18 |
16 |
14 |
12 |
12 |
10 |
10 |
8 |
4-5 |
18 |
18 |
14 |
12 |
12 |
10 |
10 |
8 |
8 |
5-6 |
18 |
16 |
14 |
12 |
10 |
10 |
8 |
8 |
8 |
6-8 |
18 |
16 |
12 |
10 |
10 |
8 |
6 |
6 |
6 |
8-10 |
18 |
14 |
12 |
10 |
8 |
8 |
6 |
6 |
4 |
10-12 |
16 |
14 |
10 |
8 |
8 |
6 |
6 |
4 |
4 |
12-14 |
16 |
12 |
10 |
8 |
6 |
6 |
6 |
4 |
2 |
14-16 |
16 |
12 |
10 |
8 |
6 |
6 |
4 |
4 |
2 |
16-18 |
14 |
12 |
8 |
8 |
6 |
4 |
4 |
2 |
2 |
18-20 |
14 |
12 |
8 |
6 |
6 |
4 |
4 |
2 |
2 |
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3
OPERATION
Injury Hazard
Install proper safety guards as needed. Pumps with glass jars need safety guards to protect against breaking glass.
Use only recommended air handling parts acceptable for pressure not less than 70 psi..
Keep fingers and objects away from openings and rotating parts.
When provided, motor terminal covers must be in place for safe operation.
Check that coupling guard and shroud are in place before operating.
Product surfaces may become hot during operation, allow product surfaces to cool before handling.
Do Not direct air stream at body. Air stream from product may contain solid or liquid material that can result in eye or skin damage, wear proper eye protection.
Do Not spray flammable or combustible liquid. Wear hearing protection. Sound level from product may exceed 85 dBA.
Failure to follow these instructions can result in burns, eye injury or other serious injury.
It is your responsibility to operate this product at recommended pressures or vacuum duties and room ambient temperatures. Do Not start against a vacuum or pressure load.
Start Up
If pump is extemely cold, let it warm up to room temperature before starting. If motor fails to start or slows down significantly under load, shut off and disconnect from power supply. Check that the voltage is correct for motor and that motor is turning in the proper direction. Turning in the wrong direction will drastically reduce vane life. Vane life will be drastically reduced if motor is not operating properly. Vanes can break or be damaged if motor/pump runs in the wrong direction.
MAINTENANCE
WARNING
c 
Electrical Shock Hazard
Disconnect electrical power supply cord before performing maintenance on this product.
If product is hard wired into system, disconnect electrical power at the circuit breaker or fuse box before performing maintenance on this product.
Failure to follow these instructions can result in death, fire or electrical shock.
Injury Hazard
Wear eye protection when flushing this product.
Air stream from product may contain solid or liquid material that can result in eye or skin damage.
Flush this product in a well ventilated area.
Do Not use kerosene or other combustible solvents to flush this product.
Failure to follow these instructions can result in eye injury or other serious injury.
It is your responsibility to:
• Regularly inspect and make necessary repairs to product in order to maintain proper operation.
• Make sure that pressure and vacuum is released from product before starting maintenance.
Check intake and exhaust filters after first 500 hours of operation. Clean filters and determine how frequently filters should be checked during future operation. This one procedure will help to assure the productʼs performance and service life.
Clean filters when necessary by removing and washing in a solvent or soap and water. After cleaning, dry with compressed air to make sure all moisture is removed before replacing filters.
Flushing
Flushing this product to remove excessive dirt, foreign particles, moisture or oil that occurs in the operating environment will help to maintain proper vane performance. If your pump is not getting the vacuum or pressure level expected, flushing is required. Vanes will stick when dirty and may cause pump to be noisy or inefficient.
Use only Gast recommended Flushing Solvent or other non-petroleum based flushing solvent. Do Not use kerosene or ANY other combustible solvent to flush product.
1. Disconnect electrical power supply.
2. Release all pressure and vacuum from pump.
3. Remove all accessories at the inlet and exhaust ports.
4. Remove filter.
5. Start product. Place towel over exhaust port to clean up solvent. If using liquid solvent, pour several tablespoons directly into inlet port. If using Gast recommended Flushing Solvent, spray solvent for 5-10 seconds into inlet port.
6. Block the inlet port and draw a deep vacuum for 15-20 seconds. Release the vacuum.
7. Listen for changes in the sound of the motor. If motor sounds smooth, go to next step. If motor does not sound like it is running smoothly, repeat steps 5 and 6 until you can hear a difference in the operating sound of the pump.
8. Start the pump and let it run for 1 minute, then turn pump off.
9. Replace all accessories at the inlet and exhaust ports.
10. Replace filter before resuming operation.
Check that all external accessories such as relief valves and gauges are attached to cover and are not damaged before re-operating product.
SHUTDOWN PROCEDURES
It is your responsibility to follow proper shutdown procedures to prevent product damage.
Failure to do so may result in premature pump failure. The Gast Manufacturing lubricated Vacuum Pumps and Compressors are constructed of ferrous metals or aluminum which are subject to rust and corrosion when pumping condensable vapors such as water. Follow the steps below to assure correct storage and shutdown between operating periods
1. Disconnect plumbing.
2. Operate product for at least 5 minutes without plumbing.
3. Cover inlet port (vacuum side) and run pump for 1-3 minutes. Shut the pump down under vacuum.
4. This unit requires lubrication. Refill oil reservoir to proper level before storage.
5. Be sure to plug open ports so dirt and other contaminants do not enter the unit. It is now ready for shutdown.
4
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