Gast 74R Operation & Maintenance Manual Download Page 2

Motor Control
It is your responsibility to contact a qualified
electrician and assure that the electrical installation
is adequate and in conformance with all national
and local codes and ordinances.  The metal
capacitor must be grounded.

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 must be able 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.

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:

You will be killed or seriously injured if you don’t
follow instructions.

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.  

Correct installation is your responsibility. Make sure
you have the proper installation conditions and that
installation clearances do not block air flow.

Blocking air flow over the product in 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.  Consult
your Gast Distributor/Representative for additional filter
recommendations.

WARNING

DANGER

c

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.

WARNING

Electrical Shock Hazard

Plumbing
Remove plugs from the IN and OUT ports.  Connect
with pipe and fittings that are the same size or larger
than the product’s threaded ports.  Be sure to connect
the intake and exhaust plumbing to the correct inlet and
outlet ports.  Ports will not support plumbing.

Install relief valves and gauges at inlet or outlet or both,
to monitor performance.  Check valves may be required
to prevent back streaming through the pump.

Electrical Connection

c

This product must be properly grounded.

Do not modify the plug provided. If it will not
fit the outlet, have the proper outlet installed
by a qualified electrician.

If repair or replacement of the cord or plug is
necessary, do not connect the grounding wire
to either flat blade terminal. The wire with
insulation that is green or green with yellow
stripes is the grounding wire.

Check the condition of the power supply wiring.
Do not permanently connect this product to
wiring that is not in good condition or is 
inadequate for the requirements of this product.

Failure to follow these instructions can result in
death, fire or electrical shock.

WARNING

Electrical Shock Hazard

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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