Graco GT 750 User manual

Instructions
GT 750 Grease
Pump 3A5363B
EN
For transferring grease using a medium pressure, high volume pump. For professional use
only.
Model No.:
24W337, Series A: 400 lb (180 kg) drum length
25D116, Series A: 120 lb (55 kg) drum length
24W498, Series A: stubby length
3600 psi (24.8 MPa, 248 bar) Maximum Working
Pressure
100 psi (0.7 MPa, 7 bar) Maximum Air Inlet Pressure
Related Manuals
3A1211 SaniForce™Air Motor
Important Safety Instructions
Read all warnings and instructions in this
manual. Save these instructions.

Warnings
23A5363B
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
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 surgi-
cal 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.
FIRE AND EXPLOSION HAZARD
When flammable fluids are present in the work area, such as gasoline and windshield wiper fluid, be
aware that flammable fumes can ignite or explode. To help prevent fire and explosion:
• Use equipment only in well-ventilated area.
• Eliminate all ignition sources, such as cigarettes and portable electric lamps.
• Ground all equipment in the work area.
• Keep work area free of debris, including rags and spilled or open containers of solvent and gaso-
line.
• Do not plug or unplug power cords or turn lights on or off when flammable fumes are present.
• Use only grounded hoses.
•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.

Warnings
3A5363B 3
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
component. See Technical Specifications in all equipment manuals.
• Use fluids and solvents that are compatible with equipment wetted parts. See Technical Specifi-
cations in all equipment manuals. Read fluid and solvent manufacturer’s warnings. For complete
information about your material, request Safety Data Sheets (SDSs) from distributor or retailer.
• 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 man-
ufacturer’s replacement parts only.
• Do not alter or modify equipment. Alterations or modifications may void agency approvals and cre-
ate 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 equip-
ment, 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 Safety Data Sheets (SDSs) 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.
PERSONAL PROTECTIVE EQUIPMENT
Wear appropriate protective equipment when in the work area to help prevent serious injury, including
eye injury, hearing loss, inhalation of toxic fumes, and burns. Protective equipment includes but is not
limited to:
• Protective eyewear, and hearing protection.
• Respirators, protective clothing, and gloves as recommended by the fluid and solvent manufac-
turer.
WARNING

Installation
43A5363B
Installation
Typical Installation
Key:
A Grounded Air Line
B Bleed-type Master Air Valve
CAirFilter
D Air Line Oiler
E Air Regulator
F Fluid Hose
G Elevator Assembly
H Ground Wire
J Follower Plate
K Drum Cover
L Air Motor
FIG. 1
A
B
C
D
E
F
H
K
J
G
L

Installation
3A5363B 5
Installation Instructions
NOTE: The reference letters in the following instructions
refer to the Typical Installation illustration, page 4.
Grounding
Pump: use ground wire and clamp (as shown in FIG. 2).
Connect the other end of the ground wire to a true earth
ground.
1. Remove the ground screw (Z) and insert through
eye of the ring terminal at end of ground wire (Y).
2. Fasten the ground screw (Z) back into the pump and
tighten securely.
Air and fluid hoses: use only electrically conductive
hoses.
Air compressor: follow manufacturer’s recommenda-
tions.
Dispense valve: ground through connection to a prop-
erly grounded fluid hose and pump.
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 non-conductive 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 dispense
valve firmly to the side of a grounded metal pail, then
trigger the valve.
Mounting the Pump
• Select a convenient installation location for the
equipment to ensure easy operator access to the
pump air controls, sufficient room to change supply
containers, and a secure mounting platform.
• If you are mounting the pump directly on the supply
tank, position the pump so its intake valve is no
more than 1 in. (25 mm) from the bottom of the con-
tainer. Mount the pump to the cover or other suitable
mounting device.
• Mount the pump to suit the type of installation
planned. Very heavy lubricants may require an
inductor plate.
• Install the air line accessories as shown in the Typi-
cal Installation, page 4. Install a bleed-type master
air valve (B) within easy reach of the pump,
upstream from the air regulator. Install an air filter
(C) to remove harmful dirt and moisture from your
compressed air supply. For automatic air motor
lubrication, install an air line oiler (D) close to the
pump air inlet. Install an air regulator (E) to control
pump speed.
• Be sure the air hose is properly sized to deliver an
adequate supply of air to the motor. Refer to the
Technical Data on page 15.
• Connect a dispensing hose to the pump outlet.
Install an appropriate dispensing valve to the hose.
• Ground the pump as explained on page 5.
The equipment must be grounded to reduce the risk
of static sparking. Static sparking can cause fumes to
ignite or explode. Grounding provides an escape wire
for the electric current.
FIG. 2
Z
Y
Mount the pump securely so that it cannot move
around during operation. Failure to do so could
result in personal injury or equipment damage.
A bleed-type master air valve (B) is required to shut
off and relieve air pressure that may be trapped in the
air motor. Trapped air could cause the pump to cycle
unexpectedly and cause serious bodily injury, includ-
ing amputation.

Operation
63A5363B
Operation
NOTE: The reference letters in the following instructions
refer to the Typical Installation illustration, page 4.
Pressure Relief Procedure
Follow the Pressure Relief Procedure whenever
you see this symbol.
1. Close the supply pump’s bleed-type master air valve
(B) (required in the system).
2. Open the dispensing valve until the pressure is fully
relieved.
Priming and Pump Speed
Adjustment
1. Open the bleed-type master air valve (B).
2. Open the dispensing valve, and slowly open the air
regulator (E) until the pump is running smoothly.
3. After all the air is purged, close the dispensing
valve.
The pump will start and stop as the valve is opened
and closed.
4. Use the air regulator (E) to control the pump speed
and fluid pressure. Always use the lowest pressure
necessary to obtain the desired results.
5. If the pump accelerates quickly or is running too
fast, stop it immediately and check the fluid supply. If
the supply container is empty and air has been
pumped into the lines:
a. Refill the supply container.
b. Prime the pump and fill the lines with fluid to
remove all the air from the fluid lines.
This pump is designed to be used only in pumping
non-corrosive and non-abrasive lubricants. Any
other use of the pump can cause unsafe operating
conditions and component rupture, which can result
in fluid injection or other serious injury or fire or
explosion.
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 Pro-
cedure when you stop dispensing and before clean-
ing, checking, or servicing the equipment.
NOTICE
Never allow the pump to run dry of the fluid being
pumped. A dry pump quickly accelerates to a high
speed and may damage itself. If your pump acceler-
ates quickly or is running too fast, stop it immediately
and check the fluid supply. If the supply container is
empty and air has been pumped into the lines, prime
the pump and lines with fluid, or flush the pump and
leave it filled with a compatible solvent. Be sure to
eliminate all air from the fluid system.

Troubleshooting
3A5363B 7
Troubleshooting
NOTE: Check all other possible problems and solutions before you disassemble the pump.
Problem Cause Solution
Pump fails to operate or there is no
fluid flow
Inadequate air supply pressure Increase air supply.
Restricted air line Clear line.
Closed dispensing valve Open valve.
Clogged fluid lines, hoses, and/or
dispense valve
1. Follow Pressure Relief Proce-
dure, page 6.
2. Disconnect fluid line.
3. Turn on air. If the pump starts
when the air is turned again, the
line, hose, and/or valve is
clogged. Clear obstruction.
Damaged air motor Service air motor. See SaniForce Air
Motor manual.
Exhausted fluid supply Refill and prime or flush.
Continuous air exhaust Worn or damaged air motor gasket,
packing, seal, etc.
Service air motor. See SaniForce Air
Motor manual.
Erratic pump operation
Exhausted fluid supply Refill and prime or flush.
Held open or worn intake valve or
piston seals
Replace worn seals. See Service,
page 8.
Inadequate air supply pressure Increase air supply.
Pump operates but output low on
down stroke
Held open or worn intake valve or
piston seals
Replace worn seals. See Service,
page 8.
Fluid is coming out of the muffler Worn or damaged throat seal Replace worn seals. See Service,
page 8.

Service
83A5363B
Service
Before You Start
• Be sure you have all necessary parts on hand. Use
Graco repair kit 25D511. Use all parts in the kit for
best results.
• Parts included in the kit are marked with one aster-
isk, for example (19*), in the text and drawings.
• Clean and inspect all parts for wear or damage as
you disassemble them. Replace parts as needed.
• For best results, always use all new parts included
in kit to replace all the o-rings and packings when
you disassemble the pump.
Displacement Pump Service
Disassembly
1. Flush the pump.
2. Relieve pressure, page 6.
3. Disconnect fluid and air lines from pump and
remove pump from its installation location.
4. Clamp the air motor base (21) in a vise horizontally
by closing the vise jaws on the flange.
5. Insert a wrench through a slot in the foot valve (10)
and secure it around the flats of the piston shovel
rod (8). While holding the piston shovel rod securely
in place, use a second wrench to loosen and
remove jam nut (15). Remove washer (28), and
priming plate (14) from shovel rod (FIG. 3).
NOTE: Using a wrench to hold the piston shovel rod
(8) in place during this procedure will prevent it from
unscrewing from the piston housing (7).
6. Unscrew foot valve housing (10) from cylinder (20)
(FIG. 4).
NOTE: Poppet check (12), foot valve packings (13),
and bearing (11) slide off priming rod (8) when
removing foot valve housing.
FIG. 3
FIG. 4
1528
14*
10
8
20
10
8

Service
3A5363B 9
7. Unscrew bearing (11) from foot valve housing.
Remove the poppet check (12) and inspect foot
valve packings (13) (FIG. 5).
8. Unscrew down tube (20) from pump base (21) (FIG.
6).
Clean the tube and inspect it for wear by holding it
up to a light at a slight angle. If you see wavy lines
or scratches where the piston travels, replace the
tube as it will not seal well with the new piston seal
and the pump will perform poorly.
9. Loosen nut (5) and unscrew the valve housing (6)
from connecting rod (4) (FIG. 7).
10. Unscrew bolts (23) that connect pump base (21) to
the air motor (FIG. 8).
11. Remove pump base (21) from air motor and
unscrew packing gland (2) (FIG. 8).
12. Remove the following seals and inspect: piston seal
(22), o-ring (17), o-ring (29), throat seal (19), o-ring
(16) from the pump base (21) (See Parts, page 13).
13. Clean and inspect all parts.
FIG. 5
FIG. 6
12
11
13
10
20
21
FIG. 7
FIG. 8
5
6
4
23
21
2

Service
10 3A5363B
Reassembly
1. Apply a thin layer of grease to o-ring (17*) and
throat seal (19*)and install parts in pump base (21)
(FIG. 9).
2. Apply a thin layer of grease to o-ring (29*) and
install o-ring to packing gland (2). Tighten down
packing gland (2) to pump base (FIG. 9).
NOTE: Throat seal (19*) should be installed with the
lips pointed down towards the bottom of the pump.
3. Reattach pump base (21) to air motor (1) using 3
mounting bolts (23). Torque mounting bolts to 60
ft-lb (81.35 N•m) (FIG. 10).
4. Replace piston seal (22*) on valve housing piston
(7) (FIG. 11).
5. Screw the connecting rod (4) into the valve housing
(6) and adjust the ball travel as instructed in Check
Valve Adjustment on page 12 Tighten nut (5) to 60
ft-lb (81.35 N•m) (FIG. 11).
6. Apply a thin layer of grease to piston seal (22*).
Reinstall down tube (20) into pump base (21).
Torque to 100 to 150 ft-lb (135.6 to 203.4 N•m) (FIG.
12).
FIG. 9
FIG. 10
21
29
19*
2
17*
21
23
FIG. 11
FIG. 12
22*
7
4
6
5
20
21