Graco 25C837 Parts list manual

308302P
EN
Instructions/Parts
12:1 Ratio Stainless Steel
DynaMite™190 Extruder
Used for precision dispense of single component viscous materials for 1 quart (.95 liter)
and 1 gallon (3.79 liter) containers. For professional use only.
Not approved for use in European explosive atmosphere locations.
Part No. 25C837, Series A
Part No. 235871, Series D
Includes Pump and Ram
1200 psi (8.3 MPa, 83 bar) Maximum Fluid 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 in all related manuals. Save all instructions.
25C837, Series A 235871, Series D

Related Manuals
2308302P
Contents
Related Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Part Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Component Identification . . . . . . . . . . . . . . . . . . . . 7
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Pump Location and Set Up . . . . . . . . . . . . . . . . . 8
Connect and Disconnect Tubes . . . . . . . . . . . . . 9
Pump Components and Accessories . . . . . . . . . 9
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Pressure Relief Procedure . . . . . . . . . . . . . . . . 10
Flush the System . . . . . . . . . . . . . . . . . . . . . . . 11
Start and Adjust the Ram . . . . . . . . . . . . . . . . . 11
Start and Adjust the Pump . . . . . . . . . . . . . . . . 12
Prime the Pump and Pump Fluid . . . . . . . . . . . 13
Change the Fluid Can . . . . . . . . . . . . . . . . . . . . 13
Shutdown and Care of the Pump . . . . . . . . . . . 14
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
235871, Series D Parts . . . . . . . . . . . . . . . . . . . . . 19
25C837, Series A Parts . . . . . . . . . . . . . . . . . . . . . 22
235870, Series D Parts . . . . . . . . . . . . . . . . . . . . . 24
25C829, Series A Parts . . . . . . . . . . . . . . . . . . . . . 26
Accessory Can Opener . . . . . . . . . . . . . . . . . . . . . 28
Wiper Plate Parts . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Technical Data - Fluid Flow Chart . . . . . . . . . . . 32
Graco Standard Warranty . . . . . . . . . . . . . . . . . . . 34
Graco Information . . . . . . . . . . . . . . . . . . . . . . . . . 34
Related Manuals
Manuals
Part Description
3A3442 NXT Air Motor Repair and Parts Manual

Part Numbers
308302P 3
Part Numbers
* Wiper plates must be ordered separately.
Part No. Maximum Fluid Working Pressure Description
235871 1200 psi (8.3 MPa, 83 bar) DynaMite 190 Extruder Assembly, Series D - Approved
25C837 1200 psi (8.3 MPa, 83 bar) DynaMite 190 Extruder Assembly, Series A - Approved
235870 1200 psi (8.3 MPa, 83 bar) Pump Assembly, Series D
224908* Wiper Plate, Series A, 1 gallon (3.79 liter) size
224923* Wiper Plate, Series B, 1 quart (.95 liter) size

Warnings
4308302P
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.
SKIN INJECTION HAZARD
High-pressure fluid from spray gun, 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 the 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.
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.

Warnings
308302P 5
FIRE AND EXPLOSION HAZARD
Flammable fumes, such as solvent and paint fumes, in work area can ignite or explode. Paint or sol-
vent flowing through the equipment can cause static sparking. 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 sparking).
• Ground all equipment in the work area. See Grounding instructions.
• Never spray or flush solvent at high pressure.
• 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.
• Use only grounded hoses.
• Hold dispensing device/gun firmly to side of grounded pail when triggering into pail. Do not use pail
liners unless they are anti-static 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.
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 Sheet (SDS) 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.

Warnings
6308302P
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 Safety Data Sheet (SDS) 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.
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.

Component Identification
308302P 7
Component Identification
Key:
P Wiper Plate Assembly
1Pump
8 Bleed-Type Mater Air Valve
18 Air Assist Valve (Push Button
24 Clamps
25 Pump Bleeder Valve
27 (A) Pump Air Regulator
27 (B) Ram Air Regulator
28 Fluid Outlet Fitting
30 (A) Pump Air Pressure Gauge
30 (B) Ram Air Pressure Gauge
33 Pump Bracket
34 Base
36 Ram Director Valve
37 Air Assist Valve Connector
39 Clamp Wing Screws
57 Air Inlet for Main Air Line
76 Air Tube to Wiper Plate
111 Pump Fluid Intake Housing
302 Wiper Plate Capscrews
303 Wiper Bleed Valve
305 Wiper Plate Ring
310 Wiper Plate Connector
FIG. 1: System Components
28
1
302
25
P
8
27(B)
27(A)
18
37
57
76
111
310
36
24
39
303
305
30(B)
30(A)
34
33

Installation
8308302P
Installation
Grounding
Pump: unscrew the green grounding screw (W) and
washer (X) located on the ram base (Z). Install a 1.5
mm2(12 awg) minimum ground wire (Y) and secure with
the screw and washer. Connect the other end of the
ground wire to a true earth ground.
Air and fluid hoses: use only electrically conductive
hoses with a maximum of 500 ft. (150 m) combined
hose length to ensure grounding continuity. Check elec-
trical resistance of hoses. If total resistance to ground
exceeds 29 megohms, replace hose immediately.
Air compressor: follow manufacturer’s recommenda-
tions.
Spray gun / Dispense valve: ground through connec-
tion to a properly grounded fluid hose and pump.
Fluid supply container: follow local code.
To maintain grounding continuity when flushing or
relieving pressure: hold metal part of the spray
gun/dispense valve firmly to the side of a grounded
metal pail, then trigger the gun/valve.
Pump Location and Set Up
NOTE: Reference numbers and letters in parentheses
in the text refer to the callouts in FIG. 1 on page 7 and
the parts drawings. Refer to those for installation.
If you supply your own accessories, be sure they are
adequately sized and pressure-rated to meet the sys-
tem’s requirements. Contact your Graco distributor for
assistance in designing a system to suit your needs.
1. Place the unit on a hard, level surface. Check that
the unit is level in all directions. Refer to Dimen-
sions on page 30 to ensure that there is sufficient
overhead clearance for the pump when the ram is
fully raised. Leave room on both sides so the air
regulators will be easily accessible.
2. Read the section Pump Components and Acces-
sories on page 9. Connect an air supply hose to the
1/4 npt(f) main air inlet fitting (57). See FIG. 1 on
page 7. Refer to Connect and Disconnect Tubes
on page 9.
Wiper Plate Setup
1. Unpack the wiper plate (P). Back out the screws
(302) so they clear the pump fluid intake housing
(111).
2. Raise the ram by setting the ram director valve
switch (36) to the up position and increasing the set-
ting of the ram air regulator (27B).
3. Place the wiper plate (P) on a 2 in. thick x 4 in. wide
block of wood. Center the wiper plate and the wood
block on the base, under the pump intake housing
(111).
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: Grounding Connection on Pump
Z
Y
W
X
To reduce the risk of serious injury and damage to
equipment, do not shut off the air supply to the ram
when the ram is raised. Doing so will cause the pump
to fall uncontrolled to the bottom.

Installation
308302P 9
4. Set the ram air regulator (27B) to zero. Set the ram
director valve switch (36) to the down position. As
the ram unit slowly falls, guide the pump intake
housing (111) into the wiper plate (P).
5. Set the ram air regulator (27B) to 10 psi (0.07 MPa,
0.7 bar). Push down on the pump to install the wiper
plate (P) onto the intake housing (111). Secure the
wiper plate to the pump with the two screws (302).
6. Connect the 660 mm (26 in.) air line tube (76) from
the connector (37) at the air assist valve (18) to the
connector (310) at the wiper plate (P). Refer to Con-
nect and Disconnect Tubes on this page.
Connect and Disconnect Tubes
Follow these steps when connecting and disconnecting
any air tubes on the DynaMite 190 Extruder assembly
Connection
1. Grasp the tube, then slowly push it straight into the
fitting until it stops.
2. Be sure that the tube is securely connected, and will
not pull out when air pressure is applied. To check,
pull gently on the tube.
Disconnection
1. Follow the Pressure Relief Procedure on page 10.
2. Push evenly on the fitting’s red release button.
3. While holding the release button in, pull the tube out
of the fitting.
4. To reuse the tubing, cut off the previous connection
portion at 90°, being careful not to damage the outer
diameter of the tube.
NOTE: Use of a tube cutter is recommended. The fitting
will leak if the tubing is not cut at 90°.
Pump Components and
Accessories
The following components are supplied with the pump
(see FIG. 1 on page 7).
•The bleed-type master air valve (8) is supplied
with your system to relieve air trapped between this
valve and the pump after the air is shut off. Trapped
air can cause the pump to cycle unexpectedly. The
valve is located close to the pump, downstream
from the pump air regulator.
•The pump air regulator (27A) controls pump
speed and outlet pressure by adjusting the air pres-
sure to the pump. The regulator is located upstream
from the bleed-type master air valve.
•The ram air regulator (27B) controls ram speed by
adjusting the air pressure to the ram, and also con-
trols the pressure exerted by the wiper plate on the
fluid.
•The pump bleeder valve (25) is supplied in your
system to relieve fluid pressure in the displacement
pump, hose, and dispensing valve. Triggering the
dispensing valve to relieve pressure may not be suf-
ficient. Be sure the drain hole in the valve is pointing
down. This valve is also used to bleed air from the
pump when priming.
Air Line
Connect an air supply line to the 1/4 npt(f) main air inlet
fitting (57). Install an air line filter and lubricator in the
main air line. In the main air line, upstream from all other
air line accessories, install a second bleed-type master
air valve to shut off all air to the system and to isolate
the accessories for servicing.
Fluid Line
Connect a fluid line to the fluid outlet fitting (28). Con-
nect a suitable dispensing valve to the free end of the
line.
To help reduce the risk of serious injury when adjust-
ing or repairing the pump, including skin injection,
splashing fluid, and moving parts, the pump includes
two required safety devices: the bleed-type master air
valve (8) and the pump bleeder valve (25).

Operation
10 308302P
Operation
Pressure Relief Procedure
Follow the Pressure Relief Procedure whenever
you see this symbol.
1. Lock the sprayer, dispenser, or gun/valve trigger of
the equipment that is being used with this extruder.
2. Disconnect the main air line from the machine.
3. Set the ram director valve to the down position. The
ram slowly drops.
4. Quickly move the ram director valve up and down to
bleed air from the ram cylinder.
5. Unlock the dispensing device trigger.
6. Hold a metal part of the gun/valve firmly to the side
of a grounded pail and trigger the dispensing device
to relieve pressure.
7. Lock the dispensing device trigger.
8. Open the pump bleeder valve.
9. Leave the pump bleeder valve open until you are
ready to dispense again.
If you suspect that the spray tip/nozzle or hose is com-
pletely clogged, or that pressure has not been fully
relieved, proceed as follows:
10. Very slowly open the pump bleeder valve, having a
container ready to catch the drainage.
11. Very slowly loosen the hose end coupling to relieve
pressure gradually; then loosen it completely.
12. Clear the tip/nozzle or hose.
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 dispensing and before
cleaning, checking, or servicing the equipment.
FIG. 3: Pressure Relief Components
Ram Director Valve
Main Air Line
Pressure Gauge
FIG. 4: Open Valves
Pump Bleeder Valve