Graco M680 Operation manual

Instructions - Parts List
M680 Pump 332650A
EN
Designed for spraying high viscosity materials, such as mortars, mastics, and epoxies.
For professional use only.
Model 262921
1000 psi (7 MPa, 70 bar) Maximum Working Pressure
100 psi (0.7 MPa, 7 bar) Maximum Air Inlet Pressure
Important Safety Instructions
Read all warnings and instructions in this
manual and all supplied manuals. Save all
instructions.
ti22250a
II 2 G

Related Manuals
2332650A
Contents
Related Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Flush Before Using Equipment . . . . . . . . . . . . . . 6
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Pressure Relief Procedure . . . . . . . . . . . . . . . . . 7
Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Flushing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Disconnect the Lower . . . . . . . . . . . . . . . . . . . . 10
Reconnect the Lower . . . . . . . . . . . . . . . . . . . . 10
Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Pump Mounting Hole Diagram . . . . . . . . . . . . . . . 13
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
M680 Pump Performance Chart . . . . . . . . . . . . 15
Graco Standard Warranty . . . . . . . . . . . . . . . . . . . 16
Graco Information . . . . . . . . . . . . . . . . . . . . . . . . . 16
Related Manuals
Component manuals in English. Manuals are available
at www.graco.com.
Manual Description
332649 680cc Pump Lower
312796 NXT Air Motor

Warnings
332650A 3
Warnings
The following warnings are for the setup, use, grounding, maintenance, and repair of this equipment. The exclama-
tion point symbol alerts you to a general warning and the hazard symbols refer to procedure-specific risks. When
these symbols appear in the body of this manual or on warning labels, refer back to these Warnings. Product-specific
hazard symbols and warnings not covered in this section may appear throughout the body of this manual where
applicable.
WARNING
FIRE AND EXPLOSION HAZARD
Flammable fumes, such as solvent and paint fumes, in work area can ignite or explode. To help prevent
fire and explosion:
• Use equipment only in well ventilated area.
• Eliminate all ignition sources; such as pilot lights, cigarettes, portable electric lamps, and plastic drop
cloths (potential static arc).
• Keep work area free of debris, including solvent, rags and gasoline.
• Do not plug or unplug power cords, or turn power or light switches on or off when flammable fumes
are present.
• Ground all equipment in the work area. See Grounding instructions.
• Use only grounded hoses.
• Hold gun firmly to side of grounded pail when triggering into pail. Do not use pail liners unless they
are antistatic or conductive.
•Stop operation immediately if static sparking occurs or you feel a shock.Do not use equipment
until you identify and correct the problem.
• Keep a working fire extinguisher in the work area.
+
SKIN INJECTION HAZARD
High-pressure fluid from dispensing device, hose leaks, or ruptured components will pierce skin. This
may look like just a cut, but it is a serious injury that can result in amputation. Get immediate surgical
treatment.
• Do not point dispensing device at anyone or at any part of the body.
• Do not put your hand over the fluid outlet.
• Do not stop or deflect leaks with your hand, body, glove, or rag.
• Follow the Pressure Relief Procedure when you stop dispensing and before cleaning, checking, or
servicing equipment.
• Tighten all fluid connections before operating the equipment.
• Check hoses and couplings daily. Replace worn or damaged parts immediately.

Warnings
4332650A
EQUIPMENT MISUSE HAZARD
Misuse can cause death or serious injury.
• Do not operate the unit when fatigued or under the influence of drugs or alcohol.
• Do not exceed the maximum working pressure or temperature rating of the lowest rated system com-
ponent. See Technical Data in all equipment manuals.
• Use fluids and solvents that are compatible with equipment wetted parts. See Technical Data in all
equipment manuals. Read fluid and solvent manufacturer’s warnings. For complete information
about your material, request MSDS from distributor or retailer.
• Do not leave the work area while equipment is energized or under pressure.
• Turn off all equipment and follow the Pressure Relief Procedure when equipment is not in use.
• Check equipment daily. Repair or replace worn or damaged parts immediately with genuine manu-
facturer’s replacement parts only.
• Do not alter or modify equipment. Alterations or modifications may void agency approvals and create
safety hazards.
• Make sure all equipment is rated and approved for the environment in which you are using it.
• Use equipment only for its intended purpose. Call your distributor for information.
• Route hoses and cables away from traffic areas, sharp edges, moving parts, and hot surfaces.
• Do not kink or over bend hoses or use hoses to pull equipment.
• Keep children and animals away from work area.
• Comply with all applicable safety regulations.
MOVING PARTS HAZARD
Moving parts can pinch, cut or amputate fingers and other body parts.
• Keep clear of moving parts.
• Do not operate equipment with protective guards or covers removed.
• Pressurized equipment can start without warning. Before checking, moving, or servicing equipment,
follow the Pressure Relief Procedure and disconnect all power sources.
TOXIC FLUID OR FUMES HAZARD
Toxic fluids or fumes can cause serious injury or death if splashed in the eyes or on skin, inhaled, or
swallowed.
• Read MSDSs to know the specific hazards of the fluids you are using.
• Store hazardous fluid in approved containers, and dispose of it according to applicable guidelines.
SUCTION HAZARD
Powerful suction could cause serious injury.
• Never place hands near the pump fluid inlet when pump is operating or pressurized.
WARNING

Installation
332650A 5
Installation
Grounding
Pump: Use the ground screw (X) and lockwasher on the
motor to attach ground wire 262908 (Y). Tighten the
screw securely. Connect the other end of the ground
wire to a true earth ground.
Air and fluid hoses: use only electrically conductive
hoses. Check electrical resistance of hoses. If total
resistance to ground exceeds 29 megohms, replace
hose immediately.
Air compressor: follow manufacturer’s recommenda-
tions.
Applicator: ground through connection to a properly
grounded fluid hose and pump.
Fluid supply container: follow local code.
Object being sprayed: follow local code.
Solvent pails used when flushing: follow local code.
Use only conductive metal pails, placed on a grounded
surface. Do not place the pail on a nonconductive sur-
face, such as paper or cardboard, which interrupts
grounding continuity.
To maintain grounding continuity when flushing or
relieving pressure: hold metal part of the applicator
firmly to the side of a grounded metal pail, then trigger
the applicator.
Accessories
NOTE: Accessory Air Control Kits are available for the
NXT Air Motor. The kits include a master air valve, air
regulator, and filter. Order the kit separately. See manual
312796 for more information.
Air Line
•Bleed-type master air valve: required in your sys-
tem to relieve air trapped between it and the air
motor when the valve is closed.
Be sure the valve is easily accessible from the pump
and located downstream from the air regulator.
•Pump air regulator: to control pump speed and
outlet pressure. Locate it close to the pump.
•Air Motor Pilot Valve (Optional): to control air flow
to the air motor pilot valve to turn air motor on and
off.
•Air line filter: removes harmful dirt and moisture
from compressed air supply.
•Second bleed-type air valve: isolates air line
accessories for servicing. Locate upstream from all
other air line accessories.
•Applicator air regulator: controls air pressure to
the applicator.
The equipment must be grounded to reduce the risk
of static sparking. Static sparking can cause fumes to
ignite or explode. Improper grounding can cause
electric shock. Grounding provides an escape wire
for the electric current.
FIG. 1
TI8250a
Y
X
Trapped air can cause the pump to cycle unexpectedly,
which could result in serious injury from splashing or
moving parts.

Installation
6332650A
Fluid Line
•Fluid drain valve: required in your system, to
relieve fluid pressure in the hose and applicator.
•Fluid shutoff valve: shuts off fluid flow.
•Fluid pressure regulator: for more precise adjust-
ment of the fluid pressure.
•Applicator or valve: to dispense fluid.
•Fluid line swivel: for easier applicator movement.
•Suction kit: enables the pump to draw fluid from a
container.
Flush Before Using Equipment
The equipment was tested with lightweight oil, which is
left in the fluid passages to protect parts. To avoid con-
taminating your fluid with oil, flush the equipment with a
compatible solvent before using the equipment. See
Flushing, page 8.
NOTICE
To prevent material hardening in the fluid drain
valve, flush the fluid drain valve after every time it is
used. See Flushing on page 8.

Operation
332650A 7
Operation
Pressure Relief Procedure
Follow the Pressure Relief Procedure whenever
you see this symbol.
1. If you are pumping fluid which dries, hardens, or
sets up, flush the system. See Flushing.
2. Engage applicator trigger lock, if equipped.
3. Close the bleed-type master air valve.
4. Disengage applicator trigger lock, if equipped.
5. Hold a metal part of the applicator firmly to a
grounded metal pail. Trigger the applicator to relieve
pressure.
6. Engage applicator trigger lock, if equipped.
7. Open all fluid drain valves in the system, having a
waste container ready to catch drainage. Leave
drain valve(s) open until you are ready to spray
again.
8. If you suspect the spray tip or hose is clogged or
that pressure has not been fully relieved after follow-
ing the steps above, VERY SLOWLY loosen
threaded fitting to relieve pressure gradually, then
loosen completely. Clear hose or tip obstruction.
9. Flush the fluid drain valve if it was used.
Shutdown
1. Stop the pump at the bottom of its stroke.
NOTE: This prevents fluid from drying on the rod and
damaging the throat packings.
2. If pumping fluid which dries, hardens, or sets up,
flush the system. See Flushing.
3. Perform Pressure Relief Procedure, page 7.
4. If pumping mortar or similar materials:
a. Disconnect the Lower, page 10.
b. Disassemble and clean lower with a brush and
solvent. See lower manual 332649.
c. Assemble lower.
d. Reconnect the Lower, page 10.
This equipment stays pressurized until pressure is
manually relieved. To help prevent serious injury from
pressurized fluid, such as skin injection, splashing
fluid and moving parts, follow the Pressure Relief
Procedure when you stop spraying and before
cleaning, checking, or servicing the equipment.
NOTICE
To prevent material hardening in the fluid drain
valve, flush the fluid drain valve after every time it is
used. See Flushing on page 8.
NOTICE
Never leave water or water-based fluid in pump
overnight. If you are pumping water-based fluid,
flush with water first, then with a rust inhibitor, such
as mineral spirits solvent (also called white spirit).
Relieve pressure, but leave rust inhibitor in pump to
protect parts from corrosion.

Maintenance
8332650A
Flushing
If you are pumping fluid which dries, hardens, or sets up,
flush the system with a compatible solvent as often as
necessary to prevent build up of dried fluid in the pump
or hoses.
1. Perform Pressure Relief Procedure, page 7.
2. Remove the spray tip.
3. Hold a metal part of the applicator firmly to the side
of a grounded metal pail.
4. Start the pump.
5. If pumping mortar or similar materials:
a. Circulate flushing fluid at 60-90 cycles per min-
ute for 3-5 minutes.
b. Perform Pressure Relief Procedure, page 7.
c. Drain flushing fluid then refill with clean flushing
fluid.
d. Circulate flushing fluid at 60-90 cycles per min-
ute for a 3-5 minutes.
e. Perform Pressure Relief Procedure, page 7.
f. Drain flushing fluid.
6. If not pumping mortar:
a. Use the lowest possible fluid pressure during
flushing.
b. When flushing is complete, perform Pressure
Relief Procedure, page 7.
Maintenance
Lubrication
The accessory air line lubricator provides automatic air
motor lubrication. For daily, manual lubrication, relieve
the pressure, disconnect the regulator, place about 15
drops of light machine oil in the pump air inlet, reconnect
the regulator, and turn on the air supply to blow oil into
the motor.
Verify pump lower packing nut is 1/2 full with Throat Seal
Liquid (TSL).
This equipment stays pressurized until pressure is
manually relieved. To help prevent serious injury from
pressurized fluid, such as skin injection, splashing
fluid and moving parts, follow the Pressure Relief
Procedure when you stop spraying and before
cleaning, checking, or servicing the equipment.
R
ti21631a

Troubleshooting
332650A 9
Troubleshooting
1. Relieve the pressure.
2. Check all possible problems and solutions before
disassembling pump.
This equipment stays pressurized until pressure is
manually relieved. To help prevent serious injury from
pressurized fluid, such as skin injection, splashing
fluid and moving parts, follow the Pressure Relief
Procedure when you stop spraying and before
cleaning, checking, or servicing the equipment. Never operate the pump with the air motor spring
guard removed. Moving parts can pinch or amputate
your fingers or other body parts.
PROBLEM CAUSE SOLUTION
Pump does not operate, or no fluid
flow.
Restricted line or inadequate air
supply.
Clear, increase.
Exhausted fluid supply. Refill and prime.
Clogged fluid hoses. Clean, or replace.
Damaged air motor. Repair.
Loose or broken pump parts. Disassemble, check, repair.
Pump operates, but output is low. Insufficient air supply. Increase. See M680 Pump Perfor-
mance Chart on page 15 for
required air pressure and flow for
desired pump output.
Exhausted fluid supply. Refill and prime.
Obstructed applicator or dispensing
valve.
Clear.
Packing retainer needs adjustment. Loosen or tighten screws as neces-
sary.
Damaged fluid pump packings. Replace.
Held open or worn piston intake
valve.
Repair.
Erratic or accelerated operation. Exhausted fluid supply. Refill and prime.
Fluid intake or piston valve worn. Repair.

Repair
10 332650A
Repair
Disconnect the Lower
1. Flush the pump. Perform Flushing, page 8.
2. Perform Pressure Relief Procedure, page 7.
3. With fluid pressure relieved, remove fluid inlet and
outlet connections from pump lower.
4. Disconnect pump rod (see FIG. 2):
a. Push piston rod protective spring up and away
from coupling assembly.
b. Remove clip (A), and slide coupling cover (B) up
to remove coupling (C).
5. Hold the tie rod flats with a wrench to keep the rods
(2) from turning. Unscrew the nuts (4). Remove the
lower (3). See Parts on page 11.
6. To service the lower, refer to lower manual 332649,
supplied. To service the air motor, refer to air motor
manual 312796, supplied.
Reconnect the Lower
1. Make sure the spring guard is in place over the air
motor shaft.
2. Use at least two people to hold the lower while
another reconnects it to the motor. Place the lower
(2) on the tie rods (6) then screw the nuts (4) onto
the tie rods (2). Torque to 50-60 ft-lb.
3. Install coupling (C), slide coupling cover (B) over
coupling, then install clip (A) to secure pump rod to
air motor rod.
4. Reconnect all hoses.
5. Reconnect the ground wire if it was disconnected.
6. Fill the wet-cup 1/2 full of Graco Throat Seal Liquid
(TSL).
7. Turn on the air power supply. Run the pump slowly
to ensure that it operates properly.
NOTICE
To prevent dropping the system and damaging it,
use at least two people when lifting, moving, or dis-
connecting the pump. If disconnecting the lower, be
sure to securely brace the pump, or have two peo-
ple hold it while another disconnects it.
This equipment stays pressurized until pressure is
manually relieved. To help prevent serious injury from
pressurized fluid, such as skin injection, splashing
fluid and moving parts, follow the Pressure Relief
Procedure when you stop spraying and before
cleaning, checking, or servicing the equipment.
FIG. 2
C
B
A
ti21656a