Graco Dispensit 1052 Troubleshooting guide

Cycle Detection and Luer Lock Outlet Shown
3A0231F
EN
Operation - Maintenance
Dispensit
1052
Patented meter and dispense system for precise one-component micro-dispensing. Not
for use in explosive atmospheres.
2000 psi (14 MPa, 138 bar) Maximum Outlet Fluid Working Pressure
Metal Sleeves: 1200 psi (8 MPa, 83 bar) Maximum Material Inlet Pressure
Plastic Sleeves: 400 psi (2.8 MPa, 28 bar) Maximum Material Inlet Pressure
100 psi (0.7 MPa, 7 bar) Maximum Air Working Pressure
110°F (43°C) Maximum Ambient Temperature
150°F (65°C) Maximum Operating Temperature
Important Safety Instructions
Read all warnings and instructions in this
manual. Save these instructions.

23A0231F
Contents
1052 Valve Modes . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Isocyanate Conditions . . . . . . . . . . . . . . . . . . . . . . 6
Material Self-ignition . . . . . . . . . . . . . . . . . . . . . . . 6
Moisture Sensitivity of Isocyanates . . . . . . . . . . . . 6
Changing Materials . . . . . . . . . . . . . . . . . . . . . . . . . 6
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Optional Cycle Detection Spool Sensors . . . . . . . 7
Component Identification . . . . . . . . . . . . . . . . . . . . 9
Typical System Configurations . . . . . . . . . . . . . 9
Typical Feed System Components . . . . . . . . . 10
Typical Feed System Components (continued) 11
Metering Valve . . . . . . . . . . . . . . . . . . . . . . . . . 12
Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Typical Installation . . . . . . . . . . . . . . . . . . . . . . 13
Valve Mounting Diagram . . . . . . . . . . . . . . . . . . 14
Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Adjusting the Shot Size . . . . . . . . . . . . . . . . . . . . 16
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Sequence of Operation . . . . . . . . . . . . . . . . . . . 17
Pressure Relief Procedure . . . . . . . . . . . . . . . . . . 18
Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Electrical Requirements . . . . . . . . . . . . . . . . . . . . 20
Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Non Cycle Detect . . . . . . . . . . . . . . . . . . . . . . . 21
Cycle Detect . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
1052 Standard Inlet/Outlet Needle Block . . . . . 25
Rebuild . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Graco Ohio Standard Warranty . . . . . . . . . . . . . . 30
Graco Ohio Information . . . . . . . . . . . . . . . . . . . . 30

1052 Valve Modes
3A0231F 3
1052 Valve Modes
1052 Valves
Part No. Configuration Description
A2A03085 1052-10A-2RS1-062-V 1 Inch 1 inch storke, 0.062 diameter rod, nitrided tool steel wetted
components
A2A03073 1052-10A-2RS1-125-V 1 Inch 1 inch storke, 0.125 diameter rod, nitrided tool steel wetted
components
A2A03010 1052-10A-2RS1-188-V 1 Inch 1 inch storke, 0.188 diameter rod, nitrided tool steel wetted
components
A2A03013 1052-10A-2RS1-250-V 1 Inch 1 inch storke, 0.250 diameter rod, nitrided tool steel wetted
components
A2A03016 1052-10A-2RS1-375-V 1 Inch 1 inch storke, 0.375 diameter rod, nitrided tool steel wetted
components
A2A03091 1052-10A-2RS1-062-V-CD 1 Inch 1 inch storke, 0.062 diameter rod, nitrided tool steel wetted
components, with cycle detection
A2A03079 1052-10A-2RS1-125-V-CD 1 Inch 1 inch storke, 0.125 diameter rod, nitrided tool steel wetted
components, with cycle detection
A2A03055 1052-10A-2RS1-188-V-CD 1 Inch 1 inch storke, 0.188 diameter rod, nitrided tool steel wetted
components, with cycle detection
A2A03056 1052-10A-2RS1-250-V-CD 1 Inch 1 inch storke, 0.250 diameter rod, nitrided tool steel wetted
components, with cycle detection
A2A03057 1052-10A-2RS1-375-V-CD 1 Inch 1 inch storke, 0.375 diameter rod, nitrided tool steel wetted
components, with cycle detection
A2A03088 1052-10A-2TT1-062-V 1 Inch 1 inch storke, 0.062 diameter rod, stainless steel wetted
components
A2A03076 1052-10A-2TT1-125-V 1 Inch 1 inch storke, 0.125 diameter rod, stainless steel wetted
components
A2A03028 1052-10A-2TT1-188-V 1 Inch 1 inch storke, 0.188 diameter rod, stainless steel wetted
components
A2A03031 1052-10A-2TT1-250-V 1 Inch 1 inch storke, 0.250 diameter rod, stainless steel wetted
components
A2A03034 1052-10A-2TT1-375-V 1 Inch 1 inch storke, 0.375 diameter rod, stainless steel wetted
components
A2A03094 1052-10A-2TT1-062-V-CD 1 Inch 1 inch storke, 0.062 diameter rod, stainless steel wetted
components, with cycle detection
A2A03082 1052-10A-2TT1-125-V-CD 1 Inch 1 inch storke, 0.125 diameter rod, stainless steel wetted
components, with cycle detection
A2A03064 1052-10A-2TT1-188-V-CD 1 Inch 1 inch storke, 0.188 diameter rod, stainless steel wetted
components, with cycle detection
A2A03067 1052-10A-2TT1-250-V-CD 1 Inch 1 inch storke, 0.250 diameter rod, stainless steel wetted
components, with cycle detection
A2A03065 1052-10A-2TT1-375-V-CD 1 Inch 1 inch storke, 0.375 diameter rod, stainless steel wetted
components, with cycle detection

Warnings
43A0231F
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 symbol refers to procedure-specific risk. Refer back
to these warnings. Additional, product-specific warnings may be found throughout the body of this manual where
applicable.
WARNING
SKIN INJECTION HAZARD
High-pressure fluid from gun, 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 gun at anyone or at any part of the body.
• Do not put your hand over the dispense outlet.
• Do not stop or deflect leaks with your hand, body, glove, or rag.
• Follow Pressure Relief Procedure in this manual, when you stop dispensing and before cleaning,
checking, or servicing equipment.
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 MSDS’s 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.
• Always wear impervious gloves when spraying or cleaning equipment.
• If this equipment is used with isocyanate material, see additional information on isocyanates in Iso-
cyanate Conditions Section of this manual.
PERSONAL PROTECTIVE EQUIPMENT
You must wear appropriate protective equipment when operating, servicing, or when in the operating
area of the equipment to help protect you from serious injury, including eye injury, inhalation of toxic
fumes, burns, and hearing loss. This equipment includes but is not limited to:
• Protective eyewear
• Clothing and respirator as recommended by the fluid and solvent manufacturer
• Gloves
• Hearing protection
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.
• If there is static sparking or you feel a shock, stop operation immediately. Do not use equipment
until you identify and correct the problem.
• Keep a working fire extinguisher in the work area.

Warnings
3A0231F 5
ELECTRIC SHOCK HAZARD
This equipment must be grounded. Improper grounding, setup, or usage of the system can cause elec-
tric shock.
• Turn off and disconnect power cord before servicing equipment.
• Use only grounded electrical outlets.
• Use only 3-wire extension cords.
• Ensure ground prongs are intact on power and extension cords.
• Do not expose to rain. Store indoors.
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 Data in all equipment manuals.
• Do not leave the work area while equipment is energized or under pressure. Turn off all equipment
and follow the Pressure Relief Procedure in this manual 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.
• 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 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 in this manual. Disconnect power or air supply.
PLASTIC PARTS CLEANING SOLVENT HAZARD
Use only compatible water-based solvents to clean plastic structural or pressure-containing parts. Many
solvents can degrade plastic parts and cause them to fail, which could cause serious injury or property
damage. See Technical Data in this and all other equipment instruction manuals. Read fluid and solvent
manufacturer’s warnings.
WARNING

Isocyanate Conditions
63A0231F
Isocyanate Conditions
Material Self-ignition
Moisture Sensitivity of
Isocyanates
ISO will react with moisture (such as humidity) to form
small, hard, abrasive crystals, which become sus-
pended in the fluid. Eventually a film will form on the sur-
face and the ISO will begin to gel, increasing in
viscosity. If used, this partially cured ISO will reduce per-
formance and the life of all wetted parts.
NOTE: The amount of film formation and rate of crystal-
lization varies depending on the blend of ISO, the
humidity, and the temperature.
To prevent exposing ISO to moisture:
• Always use a sealed container with a desiccant
dryer in the vent, or a nitrogen atmosphere. Never
store ISO in an open container.
• Keep the ISO lube pump reservoir (if installed) filled
with Graco Throat Seal Liquid (TSL), Part 206995.
The lubricant creates a barrier between the ISO and
the atmosphere.
• Use moisture-proof hoses specifically designed for
ISO, such as those supplied with your system.
• Never use reclaimed solvents, which may contain
moisture. Always keep solvent containers closed
when not in use.
• Always lubricate threaded parts with ISO pump oil
or grease when reassembling.
Changing Materials
• When changing materials, flush the equipment mul-
tiple times to ensure it is thoroughly clean.
• Always clean the fluid inlet strainers after flushing.
• Check with your material manufacturer for chemical
compatibility.
Spraying or dispensing materials containing isocya-
nates creates potentially harmful mists, vapors, and
atomized particulates.
Read material manufacturer’s warnings and material
MSDS to know specific hazards and precautions
related to isocyanates.
Prevent inhalation of isocyanate mists, vapors, and
atomized particulates by providing sufficient ventila-
tion in the work area. If sufficient ventilation is not
available, a supplied-air respirator is required for
everyone in the work area.
To prevent contact with isocyanates, appropriate per-
sonal protective equipment, including chemically
impermeable gloves, boots, aprons, and goggles, is
also required for everyone in the work area.
Some materials may become self-igniting if applied
too thickly. Read material manufacturer’s warnings
and material MSDS.

Grounding
3A0231F 7
Grounding
This product must be grounded. In the event of an elec-
trical short circuit, grounding reduces the risk of electric
shock by providing an escape wire for the electric cur-
rent.
Metering valve: attach ground wire from grounding lug
to true earth ground. See Component Identification
starting on page 9.
Fluid hoses: use only electrically conductive hoses.
Feed system components: attach ground wire from
grounding lug to true earth ground. See feed system
manual for grounding points.
Fluid supply container: 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.
Overview
This single-component meter and dispense device
accurately meters liquid and semi-paste materials.
The machine is ideal for a single-component application
requiring very small and precisely mixed shots.
The ratio of the pneumatic cylinder area to pump shaft
area provides the adjustable pressure intensification
needed to move the separate liquids through the needle
with a flow rate suitable for production requirements.
The complete system is enclosed. See Sequence of
Operation on page 17.
Optional Cycle Detection
Spool Sensors
The spool sensors are magnetic reed switches and
must be connected to an electrical control. An LED on
the switch illuminates to indicate the shifting of the
spool.
Optional Cycle Detection
Sensors
The sensors are magnetic reed switches and must be
connected to an electrical control package. The sensors
wires are #24 awg and have 9 foot (2.7 meters) flying
leads. An LED on the sensor illuminates to indicate a
change in state.
Suggested Sequence of Operation (See
page 17).
• The Valve Inputs are listed in FIG. 8, page 20.
• The Valve Outputs (supplied by others) consisting
of two power valves or one dual power valve [Sole-
noid-Close Spool Valve/RETract (Green Tube 1/4
in. OD) and Solenoid-Open Spool Valve/EXTend
(Yellow Tube 1/4 in.OD)]. Connect each Quick Dis-
connect (5/16-24 fitting) to respective power valve
port.
• Other needed Input would include some type of
Start device (Foot Switch or Control Box) (supplied
by others)
1. Home (Reload) Position
a. Solenoid-Close Spool Valve/RETract is acti-
vated.
b. Solenoid-Open Spool Valve/EXTend is deacti-
vated.
c. PX-EXT and PX-CSV signal have been made.
d. PX-RET and PX-OSV signal is not made.
e. Metering Rod is Retracted.
2. Shot Procedure
a. Start device signal is made.
b. Solenoid-Close Spool Valve/RETract is deacti-
vated.
c. Solenoid-Open Spool Valve/EXTend is acti-
vated.

Optional Cycle Detection Spool Sensors
83A0231F
d. PX-EXT and PX-CSV signal drops off.
e. Spool shifts from the Reload Position to the Dis-
pense Position.
f. PX-OSV signal is made.
g. Metering Rod Extends downward (Dispensing
Material).
h. PX-RET signal is made and Metering Rod is
down (Dispense Material Complete).
i. Solenoid-Open Spool Valve/EXTend is deacti-
vated.
j. Solenoid-Close Spool Valve/RETract is acti-
vated.
k. PX-OSV signal drops Spool shifts from the Dis-
pense Position to the Reload Position and
Metering Rod Retracts upward (Reloading
Material).
l. PX-CSV signal is made.
m. PX-EXT signal is made.
n. Dispense Valve is ready for next Start device
signal.

Component Identification
3A0231F 9
Component Identification
Typical System Configurations
FIG. 1
R
GREEN
GREEN
YELLOW
YELLOW
0
TIMER
DISPENSE
Liquid Control
R
PRESSURE
SYSTEM
REG-1 REG-2
AUXILIARY
PRESSURE
G-1 G-2
OFF
ON
PB-1
SW-1/PL-1
TR-1
HAND
OFF
SW-2
POWER
AUTO START
Valve
Controls
Top View of Controls
System shown with optional 4104A controls

Component Identification
10 3A0231F
Typical Feed System Components
FIG. 2
DO NOT SERVICE WITHOUT
REMOVING AIR PRESSURE AND
WEARING SAFETY GLASSES.
WARNING
F
200
psi
0
20ozCartridgeFeed
with Mounting Post
5 Gallon Pail Cover
with Diaphragm Pump
1 Gallon Ram
and Pump
5 Gallon Pail Cover
with Diaphragm
Pump and Agitator
5 Gallon Ram and
11:1 Transfer Pump
5 Gallon Pail Cover
with Diaphragm
Pump
5 Gallon Pail Cover
with 5:1 Transfer
Pump

Component Identification
3A0231F 11
Typical Feed System Components (continued)
FIG. 3
R
0
12
8
4
psi
30
22
19
15
26
R
0
12
8
4
psi
30
22
19
15
26
5 Gallon Tank with Diaphragm Pump and Stand 5 Gallon Tank with 5:1 Pump and Stand
10 Gallon Tank with Diaphragm Pump, Agitator,
Vacuum, and Stand 10 Gallon Tank with 5:1 Pump, Agitator, Vacuum, and Stand

Component Identification
12 3A0231F
Metering Valve
FIG. 4
GREEN
GREEN
YELLOW
0 43218765 21095634 987
YELLOW
Key:
A Material Inlet
C Grounding Lug
D Spool
E Metering Rod
F Oil Cup Retaining Block
G Extend Air Inlet
H Retract Air Inlet
J Dispense Air Inlet
K Reload Air Inlet
L Extend Air Flow Adjustment
Knob
M Retract Air Flow Adjustment
Knob
S Shot Size Locking Ring
T Shot Size Adjuster
Z Needle
T
S
H
G
E
M
KJ
F
DA
L
CZ

Setup
3A0231F 13
Setup
NOTE: See Typical Installation diagram.
2.
3. Perform Setup procedure for feed system compo-
nents. See feed system manual(s).
4. Place an in-line air pressure regulator, air-water
separator/filter, and shut-off/bleed valve between
the air supply and the control solenoids.
5. Connect each 1/4 in. outside diameter supplied air
line to the corresponding control solenoid. See
Component Identification starting on page 9.
6. Connect chemical lines from feed system to meter-
ing valve material inlets. See Component Identifi-
cation starting on page 9.
Typical Installation
FIG. 5
Metering Valve
Pump
Material Tank (optional)
Fluid Shut-Off Valve
Air Supply Air Shut-off and Bleed Valve
Air Pressure Regulator
User Supplied
Air-Water Separator/Filter
Control Solenoids

Setup
14 3A0231F
Valve Mounting Diagram
As desired, use the following diagram to mount the
metering valve.
FIG. 6
1.25 SQUARE
6.25 = CD
TYP. NEEDLE BLOCK
FOR LARGE ASS'Y
- OPTIONAL
.313
.377
.625
.937
1.250
.188
1.250 1.062 .625
8-32 X .38 DP
(2) PLACES
Ø.126/.128 X .25 DP
FOR 1/8 DOWEL PINS
(2) PLACES
Ø.312 C-BORE FOR
95/0503/00 O-RING
(2) PLACES
OUT IN
7.88
NEEDLE
.50
1.44
3.6 MAX
1/8NPT
MAT'L INLET
0
0.750
.937
0.312
.874
1.938
CABLE 108" LENGTH
.500
.475
2 PCS.
GREEN
YELLOW
GREEN
YELLOW
Ø.201 THRU
(2) PLACES
Ø.126/.128 X .50 DP
(2) PLACES
SEE MAIN BLOCK DETAIL FOR
MOUNTING INFORMATION TO
DESIGN CUSTOM NEEDLE BLOCKS
1.163
Non Cycle Detection

Startup
3A0231F 15
Startup
1. Lubricate the metering rod port in the oil cup retain-
ing block and fill the spool valve ports with compati-
ble lubricant such as mesamoll or silicone oil.
2. Pressurize the feed systems connected to the
metering valve to prime the system. See Technical
Data on page 29 for maximum inlet feed pressure.
3. Dispense several full stroke shots until material is
air-free and has good shut-off at the nose.
NOTE: Very viscous, compressible materials may con-
tinue to droll after system is primed. Reduce flow rate as
required to produce air-free dispense.
NOTE: Very thin materials may require tilting the valve
greater than 45 degrees and dispensing shots until
material is air-free. Remove oil from cups before pro-
ceeding.
FIG. 7: Top View of Metering Valve with Top Section
Removed
Metering Rod Port
Spool Valve Ports

Adjusting the Shot Size
16 3A0231F
Adjusting the Shot Size
1. Rotate the shot size locking ring counterclockwise
to loosen.
2. Rotate the shot size adjuster to adjust shot size.
3. Rotate the shot size locking ring clockwise to
tighten.
4. Dispense into waste container to test shot size.
5. Repeat until desired shot size is achieved.

Operation
3A0231F 17
Operation
The operation of the 1052 metering valve is controlled
by an external source. If a 4104A Control Box was pur-
chased, see the 4104A Control Box manual for opera-
tion instructions.
Sequence of Operation
Step 1: Reload
• Spool shifts to the right
• Material feed inlet is opened
• Material is transferred into the metering chambers
by a pressurized feed system
• Outlet port is blocked
• Metering rod is retracted to a precise position deter-
mining the volume of each material
Step 2: Shift
• The balanced spool shifts to the dispense position
• Material path to the needle is opened
• Material feed inlet port is blocked
• Metering rod remains in the retracted position
Step 3: Dispense
• Metering rod extends
• Material is dispensed from the metering chamber
into the needle
Upon completion of the dispense stroke, the metering
rod and spool shifts back to the reload position.

Pressure Relief Procedure
18 3A0231F
Pressure Relief
Procedure
1. Retract the metering rods. See the 4104A Control
Box manual.
2. Close the fluid shut-off valve.
3. Remove needle.
4. Dispense 5 shots. Shots should be at least 75% of
the full stroke.
5. Extend the metering rod into the tubes. If Graco
controls are provided with the system, see the
4104A Controls manual.
6. Close the incoming air shut-off/bleed valve that sup-
plies air to the metering valve.
7. Close the incoming air shut-off/bleed valve that sup-
plies the feed system. Refer to feed system manual
for pressure relief procedure.
Shutdown
1. Perform Pressure Relief Procedure.
2. Inspect the metering rod for material buildup. Clean
as necessary.
3. Lubricate the metering rod with compatible lubricant
such as mesamoll or silicone oil.
4. Remove needle and replace with 10-32 set screw.
Maintenance
Perform the following procedures once a shift.
NOTE: If material is leaking, see Troubleshooting on
page 19.
Material Reservoirs
Check material levels and refill as necessary. Ensure
that the material reservoirs are properly vented.
Air Dryer
Check the condition of the desiccant air dryer. Replace
as necessary.
Metering Rod Port
Lubricate with compatible lubricant such as mesamoll or
silicone oil. See FIG. 7 on page 15.
Spool Valve Port
Fill with compatible lubricant such as mesamoll or sili-
cone oil. See FIG. 7 on page 15.

Troubleshooting
3A0231F 19
Troubleshooting
Schematics
For standard machines, the schematics will be
included in the 4104A Parts manual.
For custom machines, the schematics will be included
in the assembly drawings manual.
Perform Pressure Relief Procedure before perform-
ing any troubleshooting procedure.
Problem Cause Solution
Metering valve stalling and no mate-
rial being dispensed despite ade-
quate input pressure
Blocked needle Check needle for cured material,
replace as required
Flow control valve closed Open needle
Metering valve not discharging nor-
mal or full volume Low material level in reservoirs Fill material reservoirs and prime the machine
Air in material tank Fill reservoir and prime machine
Material leaks past spool valve Spool valve worn or damaged Replace the spool valve
Spool will not actuate Low air pressure Increase air pressure to approxi-
mately 20-30 psi
Cured material on spool Check spool for cured material,
replace as required
Seals are worn Replace seals

Electrical Requirements
20 3A0231F
Electrical Requirements
Electrical requirements for 1052-10A shown.
FIG. 8