Graco Dyna-Star 26A938 User manual

Manual 3A7718A
EN
Instructions/Parts
Dyna-Star®Pump
Air Motors
For use on Dyna-Star Air Motor piston pumps, which are used in grease transfer
applications. For professional use only.
Model 26A938, Series A, 7.5 in. Air Motor
Model 26A939, Series A, 6.0 in. Air Motor
See page 3 for model information, including maximum
working pressure and approvals.
Related Manuals
Important Safety Instructions
Read all warnings and instructions in this
manual and in your pump or package
manual before using the equipment. Save
all instructions.
Manual
(English) Description
3A7519 Dyna-Star 200:1 and Dyna-Star 120:1
Grease Pumps

2Manual 3A7718A
Contents
Related Manuals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Component Identification . . . . . . . . . . . . . . . . . . . . . . 6
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Recycling and Disposal . . . . . . . . . . . . . . . . . . . . . . . 8
End of Product Life . . . . . . . . . . . . . . . . . . . . . . . 8
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Preventive Maintenance Schedule . . . . . . . . . . 10
Pressure Relief Procedure . . . . . . . . . . . . . . . . . 10
Repair Air Valve . . . . . . . . . . . . . . . . . . . . . . . . . 10
Replace Complete Air Valve......................... 10
Replace Seals or Repair Air Valve. . . . . . . . . . . 11
Disassemble the Air Valve............................ 11
Reassemble the Air Valve ............................ 12
Replace Pilot Valves..................................... 12
Repair Air Motor . . . . . . . . . . . . . . . . . . . . . . . . . 13
Disassemble the Air Motor ........................... 13
Reassemble the Air Motor ............................ 13
Notes: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Air Motor Seal Kits . . . . . . . . . . . . . . . . . . . . . . . 18
Air Valve Parts . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Air Valve Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Technical Specifications . . . . . . . . . . . . . . . . . . . . . . 21
California Proposition 65 . . . . . . . . . . . . . . . . . . . . . 21
Graco Standard Warranty. . . . . . . . . . . . . . . . . . . . . 22

Models
Manual 3A7718A 3
Models
Check the motor’s identification plate (ID) for the 6-digit
part number.
*Not sale-able part numbers.
FIG. 1
ID
Air Motor
Part Number
Replacement
Air Motor Part
Number Series
Stroke
(in.)
Piston Diameter
in. (mm)
Maximum Air Inlet Pressure
psi (MPa, bar)
26A938* 25T843 A 4.75 7.5 (191) 100 psi (0.7 MPa, 7.0 bar)
26A939* 25T844 A 4.75 6.0 (152) 100 psi (0.7 MPa, 7.0 bar)

Warnings
4Manual 3A7718A
Warnings
The following warnings are for the setup, use, grounding, maintenance, and repair of this equipment. The
exclamation 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
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.
• Equipment can start without warning. Before checking, moving, or servicing equipment, follow the
Pressure Relief Procedure and disconnect all power sources.
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 gasoline.
• 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
Manual 3A7718A 5
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
Specifications 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
manufacturer’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.
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 manufacturer.
WARNING

Component Identification
6Manual 3A7718A
Component Identification
Key:
Air Motor Kit Components
A Air valve
B Pilot valve (bottom pilot valve is out of view)
C Top cover
D Bottom cover
E Manifold
F Ground screw
Lift Ring, Shrouds, and fittings
G Air inlet, 1/2 in. npt(f)
H Air outlet 3/4 in. npt
J Lift ring
FIG. 2: Typical Installation
J
A
B
C
D
E
F
G
H

Component Identification
Manual 3A7718A 7
Grounding
Air Motor: use ground wire and clamp (Graco P/N
222011, not supplied), as shown in FIG. 1.
1. Connect the ground wire (Y) to the ground screw (Z)
located on the bottom of the air motor.
2. Connect the other end of the ground wire (Y) to a
true earth ground.
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. 3
Y
Z

Recycling and Disposal
8Manual 3A7718A
Recycling and Disposal
End of Product Life
At the end of a product’s useful life, recycle it in a
responsible manner.

Troubleshooting
Manual 3A7718A 9
Troubleshooting
1. Relieve pressure before checking or servicing the
equipment, following the pressure relief procedure
for your system.
NOTE: Check all possible problems and causes before
disassembling the air motor.
Problem Cause Solution
Air motor will not run. Damaged air valve (17). Replace or service air valve (17),
see page 18.
Damaged pilot valve (19). Replace pilot valves (19), see page
12.
Air continuously exhausting around
air motor piston rod.
Damaged u-cups (3, 33) Replace piston rod u-cups (3, 33),
see page 13.
Air continuously exhausting muffler. Damaged air valve plate (105) or
cup (112)
Replace or service air valve (17),
see page 10.
Damaged piston o-rings (8) Replace the seals, see page 13.
Air motor “bounces” at top of
stroke.
Damaged bottom pilot valve. Replace bottom pilot valve (19),
see page 12.
Air motor “bounces” at bottom of
stroke.
Damaged top pilot valve. Replace top pilot valve (19), see
page 12.
Icing inside the motor. Air motor is operating at high
pressure or high cycle rate.
Reduce pressure, cycle rate, or
duty cycle of motor.
Reduce the dew point of
compressed air by using a moisture
coalescing filter.

Repair
10 Manual 3A7718A
Repair
Preventive Maintenance
Schedule
The operating conditions of the system determine how
often maintenance is required. Establish a preventative
maintenance schedule by keeping a record of when and
what type of maintenance is needed, and then
determine a regular schedule for checking the system.
Pressure Relief Procedure
1. Turn off the air supply to the pump.
2. Close the bleed-type master valve (required).
3. Open the fluid ball valve and/or dispensing valve to
relieve fluid pressure.
Repair Air Valve
Refer to Parts, on page 16 for this section.
Replace Complete Air Valve
1. Stop the pump in the middle of its stroke. Follow
Pressure Relief Procedure, page 10.
2. Disconnect the air lines.
3. Remove screws (18), see Parts, page 16.
4. Remove the air valve (17) and gasket (16).
5. To repair the air valve, start at Disassemble the Air
Valve, page 11, step 1. To install a replacement
valve, continue to step 6.
6. Lubricate and align the new air valve gasket (16) on
the manifold.
7. Lubricate the air valve plate (105), then attach the
air valve (17) (torque 95 - 105 in-lb/10.7 - 11.9 N•m).
• Trapped air can cause the pump to cycle
unexpectedly, which could result in serious injury
from moving parts,
• Relieve pressure when stopping the pump and
before cleaning, checking, or servicing equipment.
• Do not lift or move the motor while pressurized.