SERVICE MANUAL
(INTERNATIONAL)
IMPINGER CONVEYOR OVENS
MODEL 1421-000-E, 1454, 1455
WITH PUSH BUTTON CONTROLS
Lincoln Foodservice Products, LLC
1111 North Hadley Road
Fort Wayne, Indiana 46804
United States of America
Phone: (800) 374-3004
U.S. Fax: (888) 790-8193 • Int’l Fax: (260) 436-0735
Technical Service Hot Line
(800) 678-9511
1450ExpElect
REV 1/5/07
SEQUENCE OF OPERATION
IMPINGER ADVANTAGE
SERIAL NUMBER N28654 AND ABOVE
(OVENS WITH PUSH BUTTON CONTROLS)
MODEL 1454
MODEL 1455
220/380VAC
240/415VAC
50 HZ.
50 HZ.
3 PHASE
3 PHASE
POWER SUPPLY
Electrical power is to be supplied to the oven by a five conductor
service.
Brown conductor is hot.
Black conductor is hot.
Black conductor is hot.
Blue conductor is neutral.
Green conductor is ground.
CONTROL BOX AUTO
COOL DOWN
When the temperature in the control box reaches 120°F ± 3°F (48.9°C
± 1.7°C), the cooling fan thermostat will switch power to the control
box cooling fan. The thermostat will interrupt power to the cooling fan
when the control box temperature falls to 100°F ± 3°F (37°C ± 1.7°C).
Electrical power is permanently supplied through three 50 A fuses to
the normally open contacts of the heat relay. Power is also supplied,
through the 10 Amp motor and control fuse, through the normally
closed control box hi-limit thermostat, to the normally open oven power
switch. Power is also supplied to the control box cooling fan
thermostat. Closing the oven power switch supplies line voltage to the
main fan motor. Closing the oven power switch also supplies line
voltage to the heat circuit and to the primary of the oven control
transformer.
MAIN FAN CIRCUIT
HEAT CIRCUIT
Closing the oven power switch supplies line voltage through the main
fan air pressure switch, through the normally closed oven cavity hi-limit
thermostat, to the oven control
TEMPERATURE CONTROL Closing the oven power switch supplies line voltage to the primary of
the control transformer and through the air pressure switch and oven
cavity hi-limit, to the oven control. Secondary voltage, 24VAC, is
supplied to the oven control. The oven control is set to desired
temperature. The thermocouple will provide varying millivolts to the
oven control. The oven control supplies line voltage to the heat
contactor at intermittent intervals to maintain desired temperature. The
display on the oven control will indicate when the heat contactor is
energized.
NOTE: The display also indicates oven temperature.
CONVEYOR DRIVE
Closing the oven power switch supplies line voltage to the conveyor
motor and to the primary of the control transformer. Secondary
voltage, 24VAC, is supplied to the oven control. Setting the oven
control to the desired time outputs voltage, through a reversing switch,
to the conveyor motor.
NOTE: The conveyor system uses a hall effect sensor and magnet to
prove operation of the conveyor motor. If the motor is not running,
“BELT JAM” is indicated on the display.
SCHEMATIC DIAGRAM
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MODEL 1421-000-E,
SERIAL NUMBER N28654 AND ABOVE
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SCHEMATIC DIAGRAM
MODEL 1454, 1455
SERIAL NUMBER N28654 AND ABOVE
TROUBLESHOOTING GUIDE
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IMPINGER ADVANTAGE ELECTRIC OVENS
SERIAL NUMBER N28654 AND ABOVE
(OVENS WITH PUSH BUTTON CONTROLS)
SYMPTOM
Oven fan will not run
POSSIBLE CAUSE
Incoming power supply
EVALUATION
Check circuit breaker, reset if required. Check power
plug to be sure it is firmly in receptacle. Measure
incoming power, call power co. if required.
Check, replace if necessary.
Fuse, 10 Amp
Fuse holder
Check, replace if necessary.
Thermostat, control
Terminals are normally closed, open at 130°F (55°C). If
open, reset and test for proper operation. If thermostat
will not hold, and control box temperature is not
exceeding 130°F (55°C), replace thermostat.
Check for line voltage supplied to switch. If no voltage is
present, trace wiring back to fuse holder. Check
continuity between switch terminals. Replace switch as
needed.
box hi-limit
Switch, oven power
Motor, main fan
Check for line voltage supplied to motor. If no voltage is
present, trace wiring back to oven power switch. Check
motor for opens, shorts or grounds.
WITH POWER OFF: Turn fan blade to check for locked
rotor.
Check circuit breaker, reset if required. Check power
plug to be sure it is firmly in receptacle. Measure
incoming power, call power co. if required.
Check, replace if necessary.
No control box cooling Incoming power supply
Fuse, 10 Amp
Fuse holder
Check, replace if necessary.
Switch, oven power
Check for line voltage supplied to switch. If no voltage
is present, trace wiring back to fuse holder. Check
continuity between switch terminals. Replace switch as
needed.
Cooling fan
Check for supply voltage to the cooling fan. If no
voltage is present, trace wiring back to the fuse holder.
If voltage is present and motor does not run, check
motor for opens shorts or grounds.
WITH POWER OFF: Check for locked rotor.
Check circuit breaker, reset if required. Check power
plug to be sure it is firmly in receptacle. Measure
incoming power, call power co. if required.
Check cooling fan thermostat (thermostat closes at
120°F and opens at 100°F). With cooling fan thermostat
pre-heated, check for continuity
See “Cooling fan thermostat” (NOTE: Thermostat will
remain closed if control box temperature remains above
120°F.
If not operating, refer to “Oven fan will not run”
Check air switch terminals for supply voltage to
terminals NO and COM. If voltage is present on one side
only, check for air tube blockage or misalignment. If
these are okay, adjust air pressure switch or replace
switch as needed.
No automatic control
box cooling
Incoming power supply
Cooling fan thermostat
Control box cooling fan Cooling fan thermostat
continues to run
Oven will not heat
Main fan
Air pressure switch
Oven cavity hi-limit
thermostat
Terminals are normally closed, opens at 660°F (350°C).
If open, reset and test oven for proper operation. If
thermostat will not hold for maximum temperature, and
oven is not exceeding control setting, check for proper
location of the capillary bulb in its spring holder. If above
checks are okay, replace hi-limit thermostat.
Check for supply voltage to primary of control
transformer. If no voltage is present, trace wiring back to
oven power switch. If voltage is present, check for
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Control transformer
6
24VAC at transformer secondary. If there is primary
voltage, but no secondary voltage, replace control
transformer.
Oven control
Check for 24VAC supply to oven control. If no voltage is
present, trace wiring back to control transformer. Check
for supply voltage to oven control. If no voltage is
present, trace wiring back to hi-limit thermostat. If
voltage is present, check for a read-out on the display. If
there is no read-out on the display, replace oven control.
If there is a read-out on the display, set the oven control
to maximum temperature (see installation operations
manual for temperature adjustment). With the oven
control at maximum temperature, check for supply
voltage to the heat contactor. If there is voltage at the
heat contactor, proceed to “Heat contactor “. If there is
no voltage at the heat contactor, trace wiring back to the
oven control. If there is no voltage output at the oven
control, check the read-out on the oven control. If the
oven control reads “PROBE FAIL” this indicates that the
thermocouple has failed or become disconnected from
the oven control
Contactor, hi-limit (Model
1421-000-E only)
Check for supply voltage to contactor coil. If no voltage
is present, trace wiring back to oven cavity hi-limit
thermostat. If supply voltage is present at the coil, check
to see that contacts are closed. If there is voltage to the
coil and the contacts are not closed, replace contactor.
Check to see that the thermocouple is securely
connected to the oven control. If the thermocouple is
connected to the oven control, and the display indicates
“PROBE FAIL”, disconnect the thermocouple from the
oven control and measure the resistance of the
thermocouple. The thermocouple should read approx.
11Ω. If these readings are not achieved, replace the
thermocouple. If these readings are correct, proceed.
If the thermocouple checks good, but the oven control
display indicates that there is a thermocouple failure,
replace the oven control. If the oven control indicates a
temperature reading, but the oven will not heat, proceed.
WITH POWER ON AND THERMOCOUPLE
Thermocouple
Oven control
Thermocouple
ATTACHED TO THE OVEN CONTROL: Measure the
DC millivolt output of the thermocouple. Refer to the
thermocouple chart (located in the “Removal” section of
the manual) for proper millivolt readings. If these
readings are not achieved, replace thermocouple.
If the thermocouple checks good, but there is no supply
voltage output to the temperature regulation valve,
replace the oven control. If there is supply voltage output
to the heat contactor, proceed.
Check for supply voltage to the heat contactor. If voltage
is present, listen for contacts to open and close. Also
check for opens or shorts in the operating coil. Replace
heat contactor as needed.
Oven control
Heat contactor
Intermittent heating
Conveyor will not run
Thermal/overload of main fan The main fan motor is equipped with internal thermal
motor
protection and will cease to operate if overheating
occurs. As the motor overheats and cool, this will cause
the heating system to cycle on and off intermittently.
Improper ventilation or lack of preventive maintenance
may cause this problem. Also most of the problems
listed under “Oven will not heat” can cause intermittent
failure.
Incoming power supply
Check circuit breaker, reset if required. Check power
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plug to be sure it is firmly in receptacle. Measure
incoming power, call power co. if required.
Check, replace if necessary.
Fuse, 10 Amp
Fuse holder
Check, replace if necessary.
Switch, oven power
Check for line voltage supplied to switch. If no voltage
is present, trace wiring back to fuse holder. Check
continuity between switch terminals. Replace switch as
needed.
Control transformer
Conveyor motor
Check for supply voltage to primary of control
transformer. If no voltage is present, trace wiring back to
oven power switch. If voltage is present, check for
24VAC at transformer secondary. If there is primary
voltage, but no secondary voltage, replace control
transformer.
Check for supply voltage to the conveyor motor at
terminal #8 to neutral. If no voltage is present, trace
wiring back to oven power switch. If voltage is present,
but the motor will not run, check the motor windings for
opens or shorts. If any of the above checks fail, replace
conveyor motor.
Capacitor, conveyor motor
Check for shorts or grounds. Replace capacitor as
needed.
WARNING: Capacitor has a stored charge, discharge
before testing.
Check continuity between switch terminals. Replace
switch as needed.
If there is voltage supplied to the motor, and the motor
capacitor and reversing switch check good, replace the
oven control.
Switch, conveyor reversing
Oven control
Conveyor motor runs,
but there is no speed
display
NOTE: Display will indicate
“BELT JAM”
Oven control
Conveyor motor
Oven control
Check for output voltage from oven control to hall effect
sensor (sensor is located in the conveyor motor).
Measure voltage at the motor connector, red wire and
yellow wire. Voltage should be approx. 10VDC. If no
voltage is present, trace wiring back to oven control. If
there is no voltage output at the oven control, replace
oven control.
If there is voltage supplied to the hall effect sensor,
check for a frequency output from the hall effect sensor.
Measure frequency across the yellow and white wires in
the motor connector. Frequency reading should be
approx. 25-100 Hz. If these readings are not achieved,
replace conveyor motor. If the readings are achieved,
proceed.
If the hall effect sensor readings are correct, but there is
no speed indicated on the display, replace the oven
control.
REMOVAL, INSTALLATION & ADJUSTMENTS
IMPINGER ADVANTAGE SERIES
CAUTION!
BEFORE REMOVING OR INSTALLING ANY COMPONENT IN THE IMPINGER
OVEN BE SURE TO DISCONNECT ELECTRICAL POWER AND GAS SUPPLY
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MOTOR, MAIN FAN - REPLACEMENT
1.Shut off power at main breaker.
2.Remove louvered motor cover from back of oven.
3.Remove wireway by taking out the (5) five hex screws.
4.Disconnect wiring from motor.
5.Remove the twelve (12) hex head bolts from the oven back and slide back straight out of the oven.
6.Remove two (2) bolts from fan hub and remove fan from motor shaft.
NOTE: Measure distance from fan blade to rear wall assembly before removal to aid in reassembly.
7.Remove the eight (8) hex head bolts from the motor mount and slide the motor assembly out of the oven back.
8.Remove motor by taking off motor clamp and removing the four (4) mounting nuts and washers.
9.Reassemble in reverse order. When motor mount assembly is set on the oven back, align motor shaft in the center
of the hole. Set fan assembly on the motor shaft.
NOTE: A. Torque specs on bolts (150 in/lb. torque)
B. It is recommended that an anti-seize compound be brushed on to the bolts around
the back and motor mount bracket before assembly.
FAN, MAIN - REPLACEMENT
Shut off power at main breaker.
Remove back assembly. (See MOTOR, MAIN FAN))
Reinstall and locate fan so that the bottom of the fan spider is 1 1/2" from the top of the oven back cone. (See Drawing)
FAN SPIDER
NOTE: MEASUREMENT MUST BE
MADE FROM CONE TO FAN SPIDER
FAN HUB
CONE
1 1/2 INCH
CAPACITOR, MOTOR - REPLACEMENT
1.Shut off power at main breaker.
2.Remove motor cover from back of oven.
3.Discharge capacitor.
4.Remove and replace.
COOLING FAN, CONTROL BOX - REPLACEMENT
1.Shut off power at main breaker.
2.Remove control panel top and front cover.
3.Remove four (4) screws from the fan frame.
4.Disconnect cord and plug and remove fan.
5.Reassemble in reverse order.
THERMOSTAT, COOLING FAN - REPLACEMENT
1.Shut off power at main breaker.
2.Remove control panel top and front cover.
3.Remove lead wires and mark for reassembly.
4.Remove two (2) screws and remove thermostat.
5.Reassemble in reverse order.
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THERMOSTAT, OVEN CAVITY HI-LIMIT – REPLACEMENT
1. Shut off power at main breaker.
2. Remove control box cover and front panel. Remove conveyor assembly and fingers from oven to aid in removal of
thermostat from oven.
3. Disconnect wires from thermostat and mark for reassembly.
4. Remove thermostat from oven.
5. Reassemble in reverse order and check system operation.
AIR PRESSURE SWITCH – REPLACEMENT
1.Shut off power at main breaker.
2.Remove control panel top and front cover.
3.Disconnect wires from air pressure switch and mark for reassembly.
4.Remove air switch tube from air pressure switch.
5.NOTE: There are two types of air pressure switches used. Remove air pressure switch from its mount.
6.Reassemble in reverse order and check system operation.
7.To adjust air pressure switch, remove cover from switch to expose adjusting screw. To increase sensitivity, turn
screw counter-clockwise. To decrease sensitivity, turn screw clockwise.
THERMOCOUPLE (TYPE K) - REPLACEMENT
1.Shut off power at main breaker.
2.Remove control panel top and front cover.
3.Slide thermocouple out of oven chamber.
NOTE: Remove conveyor and bottom fingers to aid in removal and installation of thermocouple.
4.Remove two (2) wires from temperature control. Make note of wire numbers or color and
location for reinstallation.
5.Reassemble in reverse order making sure the metal end on the thermocouple is in the wire form in the oven
chamber.
THERMOCOUPLE MEASURMENT
TEMPERATURE
200°
D.C. MILLVOLTS (APPROX.)
2.8
4.0
5.1
6.0
7.1
8.2
9.3
10.4
11.5
250°
300°
350°
400°
450°
500°
550°
600°
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CONTROL TRANSFORMER - REPLACEMENT
1.Shut power off at main breaker.
2.Remove control panel top and front cover.
3.Remove two (2) wires on primary side, note color and location.
4.Remove two (2) wires on secondary side, note color and location.
5.Remove two (2) screws from transformer base and replace assembly.
6.Reinstall in reverse order and check system operation.
CONVEYOR DRIVE MOTOR - REPLACEMENT
1.Shut power off at main breaker.
2.Remove control panel top and front cover.
3.Loosen set screw on conveyor drive sprocket and slide sprocket off shaft.
4.Disconnect motor plug.
5.Remove four (4) screws from motor frame, on control box side, and remove motor assembly.
6.Reassemble in reverse order making sure to align chain sprockets and adjust motor for proper chain tension
(1/2" SAG).
CAPACITOR, CONVEYOR MOTOR – REPLACEMENT
1.Shut off power at main breaker.
2.Remove control box cover and front panel.
3.Discharge capacitor before removing wires. Mark wires for reassembly.
4.Remove mounting screw and remove capacitor.
5.eassemble in reverse order and check system operation.
REVERSING SWITCH – REPLACEMENT
1. Shut off power at main breaker.
2. Remove control box cover and front panel.
3. Disconnect wires from reversing switch and mark for reassembly.
4. Remove mounting nut and remove reversing switch.
5. Reassemble in reverse order and check system operation.
REVERSING CONVEYOR DIRECTION
All ovens leaving our plant are wired to operate conveyors from left to right. To reverse conveyor
direction, use the following procedure.
1.Shut off power at oven switch.
2.Set conveyor reversing switch in the other position.
3.Turn oven “on” and check for proper operation.
ON-OFF SWITCH - REPLACEMENT
1. Shut off power at main breaker.
2. Remove control box cover.
3. Remove access cover.
4. Depress spring clips on side of switch and push out.
5. Remove wires from back of switch, note wire number and location.
6. Reassemble in reverse order and check system operation.
NOTE: Make sure switch housing is fully seated in control box housing.
OVEN CONTROL – REPLACEMENT
A.
B.
C.
D.
E.
Shut off power at main breaker.
Remove control box cover and front panel.
Remove all wiring connections and mark for reassembly.
Remove oven control by pulling control from the mounting pins. Remove control from oven.
Before installing new oven control, set voltage jumper (located at the bottom center of the
oven control) to the proper voltage (120V/240V) position. Install the four pushbutton extensions
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(included with the oven control) by pushing the extensions onto the four set buttons on control.
Reassemble in reverse order and check system operation.
F.
G.
Set the oven control for the proper operating mode. The 1400 series ovens use a single temperature control
system. The oven control must be set to the proper operating mode. Set the control as follows: With the oven
power switch “off”, depress the “time” and “up” buttons and turn the oven “on”. Control will indicate
“Imp I or Imp II” Release the buttons. Press the “up” or “down” button until “Imp I” and “temp to store” appears
on the display. Press the “temp” button. The control is now set for Impinger I conveyor and single burner
operation.
FUSE HOLDER – REPLACEMENT
1.
2.
3.
4.
5.
Shut off power at main breaker.
Remove control box cover.
Remove all wiring from fuse holder and mark for reassembly.
Remove mounting nut for fuse holder and remove fuse holder.
Reassemble in reverse order and check system operation.
BEARING, CONVEYOR – REPLACEMENT
1. Remove conveyor from oven and place on flat work surface.
2. Remove connecting links from conveyor belt. See Installation and operations manual.
3. Remove conveyor belt from conveyor. Remove drive sprocket from drive shaft if required.
4. Move shaft toward end of conveyor, and shaft with bearings will now slip out of holding bracket.
5. Replace bearing and reassemble in reverse order.
HEAT CONTACTOR – REPLACEMENT
1. Shut off power at main breaker.
2. Remove control box cover and front panel.
3. Remove all wiring from contactor and mark for reassembly.
4. Remove mounting screws and remove contactor.
5. Reassemble in reverse order and check system operation. NOTE: be sure that contactor is not mounted upside
down, as this will cause a constant “on” condition.
HI-LIMIT CONTACTOR – REPLACEMENT
See “HEAT CONTACTOR – REPLACEMENT”
EMI FILTER – REPLACEMENT
1. Shut off power at main breaker.
2. Remove control box cover and front panel.
3. Remove all wiring from filter and mark for reassembly.
4. Remove mounting screws and remove filter.
5. Reassemble in reverse order and check system operation.
HEATING ELEMENT – REPLACEMENT
1. Shut off power at main breaker.
2. Remove back cover.
3. Disconnect wiring from heating element and mark wires for reassembly.
4. Disconnect motor wiring and mark for reassembly.
5. Remove oven back assembly from oven.
6. Remove fan shroud.
7. Remove heating element from oven back.
8. Reassemble in reverse order and check system operation. NOTE: Be sure heating element connections are tight.
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THERMOSTAT, CONTROL BOX HI-LIMIT – REPLACEMENT
1. Shut off power at main breaker.
2. Remove control box cover and front panel.
3. Remove wiring from thermostat and mark for reassembly.
4. Remove mounting screws and remove thermostat.
5. Reassemble in reverse order and check system operation. NOTE: Be sure to press reset button on new
thermostat to set for operation.
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GENERAL VIEW
ADVANTAGE SERIES
LETTER
PART NUMBER
DESCRIPTION
Door hinge
Access window assembly
Retainer (old style)
Retainer (new style)
Handle spacer
A
B
C
369003
369110
369337
369929
369828
369209
369310
369308
369334
369309
350638
369311
369336
369906
370110
369157
1534
D
E
F
G
H
J
K
L
M
N
O
P
Q
R
S
T
Latch & strike
Screw, 6-32 x 3/16”
Bottom, access window
Access door glass
Top, access window
Handle
Handle spacer (2 req.)
Door latch
Screw, 8-32 x 5/8”
Door assembly (solid)
Door assembly (with window)
Finger support assembly
Support bracket pin
Strike assembly
369057
369643
1009
Oven top
U
V
W
X
Y
Z
*
AA
BB
CC
DD
EE
FF
GG
HH
JJ
KK
LL
369062
369140
369903
369141
369139
369058
369211
369203
369749
369204
369373
369748
369328
369052
369030
369904
369053
Top, control box
Compression spring
Washer, flat
Conveyor hold down bracket
Shoulder screw
Baffle, inlet and outlet
Thumb screw (not shown)
Stud, wing head
Chain cover kit (includes AA, CC)
Split ring retainer
Receptacle, snap –in
Bracket, chain cover
Leg, stand
Adjustable leg
Caster, 6”
Insulation holder assembly
Finger housing
Columnating plates –
see installation operations manual
Finger cover
Crumb pan, internal
Window frame, bottom
Glass, access window
Window frame, top
MM
NN
OO
PP
369055
369218
369926
369925
369927
QQ
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CONTROL BOX
1421-000-E, 1454,1455
LETTER
PART #
369066
370373
369507
369025
369119
369134
370163
370387
370485
369838
357107
369014
369378
369331
370359
369368
370388
370360
4000054
369125
369427
370362
370363
370354
369432
370355
7006831
DESCRIPTION
A
B
C
D
E
F
G
H
I
Sprocket, 10 tooth
Conveyor motor
Thermostat, cooling fan
Air pressure switch
Terminal block
Fuse, 50A
Terminal block, 5 Pole
Filter, EMI
Contactor, mercury
Thermostat, control box hi-limit
Fuse holder
Fuse, 10A
Cooling fan
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
Finger guard
Reversing switch
Thermostat, oven cavity hi-limit
Cover, access
Capacitor, Conveyor motor
Ground lug
Terminal block, 2-pole
Transformer, control
Thermocouple, type “K”
Front cover assembly
Facia, label
Switch, on/off
Oven control
Top, control panel
AA
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OVEN BACK
ADVANTAGE SERIES
GAS AND ELECTRIC
LETTER
A
PART NUMBER
DESCRIPTION
369808
370140
369214
369033
369215
369192
369306
369646
369647
369213
369547
369287
369315
369122
Cover, motor (gas ovens)
Cover, motor (electric ovens)
Motor, main fan (50 Hz.)
Motor clamp
Motor support assembly
Capacitor, 7.5 MFD
Oven back assembly, gas oven
Stand-off
Inlet panel
Main fan
Bracket, thermostat
Heating element, 208V
Heating element, 220V
Heating element, 240V
B
C
D
E
F
G
H
J
K
M
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CONVEYOR
1450 SERIES
LETTER
A
PART NUMBER
369830
369816
370092
369825
369813
369314
369812
369160
369814
369811
369161
369806
370050
369162
DESCRIPTION
Complete conveyor assembly
Conveyor belt
Conveyor belt, 1 foot section
Retaining ring
Conveyor bearing block
Roll, conveyor, notched
Conveyor idler shaft
Conveyor pan stop
Connecting link
Conveyor drive shaft
Roller chain sprocket
Crumb pan
Conveyor frame
Drive chain
B
C
D
E
F
G
H
J
K
L
M
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