Market Forge MF2A Service Manual

MODELS:

SERVICE &

PARTS MANUAL

Manual & Automatic
2A & MF - 2A
3A & MF - 3A

Form Number 5099 6/97 Printed in U.S.A.

Model : A-1 Cooker

Operating Instructions & General Maintenance

THE CONTROL BOX ASSEMBLY

The control box assembly is a device which
converts an electrical impulse into a mechanical
action. The mechanical action, stemming from
the sudden release of a spring loaded system of
levers, shuts off the steam supply, exhausts the
steam from the cooking chamber, switches off a
pilot light, and sets off a buzzer. This action is
preset manually, with the simple action of
setting the timer to the cooking timer required
and pulling out the operating handle into the
"on" position. The illustrations of "on" and "off"
positions will serve to familiarize you with the
proper relationship of the inner parts of the

control box assembly.

HOW IT WORKS

When in "off" position; the valve will be closed
re-stricting the steam from passing into the
cooking compartment, the pilot light will be off,
the buzzer inactive and the solenoid de-

energized.
When the timer is set for the required cooking

time and the operating handle is pulled to the
"on" position;
the valve will be opened to allow steam into the

cooking compartment, the pilot light will light up,
signifying that cooking is taking place, the
buzzer and solenoid will still be de-energized.

TROUBLE -TEST AND REMEDIES

If the operating handle will not lock in the "on"

When the cycle on the timer clock has been
completed, a flow of current will energize the
solenoid forcing the solenoid push rod to lift and
disengage the operating handle. The operating
handle now freed from the bumper and stop bar
will spring back to the "off" position. The innermost
micro-switch, released from the pressure of the pin
of the operating handle will break the circuit to the
solenoid, and the pilot light and the solenoid both
will become inactive. The nearer solenoid having
been pushed into a locked position under the
buzzer lock will remain in contact operating the
buzzer until re-leased by pushing the buzzer

release knob by hand.

position:

Check first that timer has been set.
Check that the stop bar is properly secured.

Check that solenoid and bracket is positioned
properly.

If the operating handle fails to retract to "off"
position:

Check the valve synchronizer spring for
looseness.

Check all linkage for binding or loosened parts.

Check switch on timer for continuity.

Check micro switch for bent arm.
Check for blown fuse and then for defective
wiring or defective solenoid.

TO SERVICE SUPPLY VALVE AGAINST LEAKS

Remove the interference of the pivot arm by
detaching it at the actuating arm junction and from
the pivot stud. Remove the pivot stud and proceed
as follows:

1. Remove existing valve cap (6). (It is not
necessary to remove the valve.)

2. Replace valve cap (6) with the seating tool
after
having retarded the bolt to a point where it will not
prematurely strike the ball in the valve.

3. After the seating tool-is well secured, screw down
the bolt to make contact with the ball assembly
and apply pressure to force the ball to "make" a
new seat.

4. Remove the seating tool and replace it with

original valve cap(6). (We recommend an
application of "Rector seal" to threads to make
a secure fit.)

5. Repeat the above process if the first attempt does

not stop the valve from leaking.

*(Seating tool may be obtained from the factory.)

THE STEAM PRESSURE GAUGE ASSEMBLY
To remove the complete steam pressure gauge

assembly. it will first be necessary to remove the side
panel. The steam pressure gauge may then be
detached by removing item (2) and then removing the
two nuts which hold the pressure gauge bracket in
place. The gauge is then removed from the front of
cooker. To reassemble, reverse the above procedure.

ITEM

PART

NUMBER
1 90 - 8693 3/16" O.D. Tubing
2 10-4370 Brass Nut for Comp. Fitting
3 10-4371 Brass Sleeve for 3/16" Comp. Fitting
4 10-4748 0-30 Pressure Gauge
5 10-3360 1/8" IPS Male X3/16"O.D­6 90-0018 Seating Tool

DESCRIPTION

ITEM

10 90-2434 Supply & Exhaust Valve - Comp.

PART

NUMBER

1 10-3774 Valve Synchronizer Bearing
2 10-1133 'O' Ring
3 90-4153 Valve Synchronizer
4 90-0483 Exhaust Valve Ball
5 90-2419 Valve Synchronizer Lever &

6 10-0410 Valve Bonnet
7 90-2442 Supply Valve Seat
8 91-6204 Valve Body Gasket
9 90-2443 Exhaust Valve Seat

DESCRIPTION

Supply Ball Assembly

THE STEAM MANIFOLD AND VALVE
ASSEMBLY

The steam manifold and valve assembly
provides a means of steam input and exhaust
control for each cook ing compartment. Though
complete removal of the manifold and valve
assembly will be necessary to replace a
complete valve, each may be serviced in its

position by following these service instructions.

TO DISASSEMBLE VALVE

1. Shut off the steam supply to the cooker.

2. Unfasten the pivot arm at points A and B.

3. Unfasten the valve synchronizer spring at
point C remove to free valve actuating arm and

spacer.

4. Remove the pivot stud to allow more working
room.

5. Remove valve cap (6) and valve bonnet
(1).

6. Pull out valve synchronizer (3).

7. Lift out valve synchronizer lever and ball

assembly (5).

8. Insert a pencil in the hole of valve
synchronizer ball (4) and lift out through

the front portal.

TO ASSEMBLE VALVE

1. Slip valve synchronizer ball (4) into the
valve with the hole facing the front portal.

2. Drop valve synchronizer lever and ball
assembly (5) in from the top opening of
the valve with out out on the lever facing

ball (4).

3. Manipulate valve synchronizer (3) in
position (large prong in ball - smaller
prong in lever).

4. Screw on valve bonnet (1) and valve cap
(6).

5. Place the spacer over the shaft of the
valve synchronizer.

6. Place the valve actuating arm over the
shaft of the valve synchronizer with the

bushing facing the valve.

7. Fit the valve synchronizer spring into the
hole in the shaft of the valve
synchronizer, and secure it in place with
the screw and the flex -loc nut.

8. Secure the pivot stud into the wall and
assemble the pivot arm fastening at point

A and then at point 8.