Maytag MDG31 Manual

Service Procedures

for the

Model MDG31,51,77 Dryer

Hot Surface Ignitor Gas

Part No. 450274

Maytag Co.

403WestFourthStreet North

Newton,Iowa 50208

(641) 787-7000

“IMPORTANT NOTE TO PURCHASER”

Information must be obtained from your local gas supplier on the

instructionstobefollowediftheusersmellsgas. Theseinstructions

mustbepostedinaprominentlocationnearthe dryer.

FOR YOUR SAFETY

Do not store or use gasoline

orotherflammablevapors

andliquidsinthevicinityof

thisoranyother appliance.

POUR VOTRE SÉCURITÉ

Ne pas entreposer ni utiliser d’essence

nid’autresvapeursouliquides

inflammablesàproximité de cet

appareiloude tout autre appareil.

Wehave tried to make this manual as complete aspossible andhope you will find it useful. The manufacturer

reserves the right to make changes from time to time, without notice or obligation, in prices, specifications,

colors, and material, and to change or discontinue models. The illustrations included in this manual may not

depict your particular dryer exactly.

IMPORTANT

For your convenience, log the following information:

DATEOFPURCHASE ______________________________________________ MODELNO. ____________________________

DISTRIBUTOR’S NAME ___________________________________________________________________________________

SERIAL NUMBER(S) ______________________________________________________________________________________

_______________________________________________________________________________________________________

For replacement parts, contact the distributor from which the dryer was purchased or contact:

MAYTAG

403 West Fourth St. North

Newton,Iowa 50208

(641) 787-7000

Retain This Manual in a Safe Place for Future Reference

This product embodies advanced concepts in engineering, design, and safety. If this product is properly

maintained, it will provide many years of safe, efficient, and trouble free operation.

Only qualified technicians should service this equipment.

OBSERVE ALL SAFETY PRECAUTIONS displayed on the equipment or specified in the installation

manual included with the dryer.

The following “FOR YOUR SAFETY” caution must be posted near the dryer in a prominent location.

MDG31,51,77

Table of Contents

Part Locations and Removal ................4

LowerFrontPanel Removal ......................................... 4

UpperFrontPanel Removal ......................................... 4

TopCoverRemoval....................................................... 4

LintBox/BlowerAssemblyRemoval............................. 4

GasValve/Ignition SystemRemoval............................. 5

GasValve/Ignition System Components ...................... 6

OvenHousing Components.......................................... 6

TumblerSupport

WheelAssembly Replacement .................................... 6

TumblerAlignment ....................................................... 7

BeltReplacement ........................................................ 8

Placing the Belt ........................................................... 8

MDG31BeltReplacement ............................................ 9

Placing the Belt ........................................................... 9

Electrical Component Locations........10

Electrical Panel ......................................................... 10

Sail Switch andAxial ProbeAssembly ...................... 10

Exhaust Probe, Exhaust Hi-limit,

andLintDrawerSwitch ...............................................11

IMPORTANT

You must disconnect and lockout the electric

supply and the gas supply or the steam supply

before any covers or guards are removed from

the machine to allow access for cleaning,

adjusting,installation,ortestingofanyequipment

per OSHA (Occupational Safety and Health

Administration)standards.

Please observe all safety precautions

displayed on the equipment and/or specified in

theinstallationmanualincluded withthedryer.

CAUTION

Dryer(s)should never beleftunattendedwhile in

operation.

“Caution: Label all wires prior to disconnection

whenservicingcontrols. Wiringerrorscancause

improperoperation.”

«Attention: Lor des opérations d’entretien des

commandes étiqueter tous fils avant de les

déconnecter. Toute erreur decâblage peut étre

unesourcededanger et de panne.»

WARNING

Childrenshould notbeallowed toplayonor near

thedryer(s). Childrenshouldbesupervisedifnear

dryer(s)inoperation.

Under no circumstances should the dryer door

switch(es), lint door/drawer switch(es), or heat

safetycircuit(s)everbe disabled.

Thedryermustnever beoperatedwithanyof the

back guards, outer tops, or service panels

removed. Personalinjury or fire could result.

Thedryermustnever beoperatedwithoutthelint

filter/screen in place, even if an external lint

collectionsystemisused.

FOR YOUR SAFETY

Do not use dryer in the presence of dry

cleaningfumes.

The dryers must not be installed or stored in

an area where it will be exposed to water

and/orweather.

The wiring diagram for the dryer is located in

thefront electrical control box area.

4 MaytagCo. 450274-4

Part Locations and Removal

LOWER FRONT PANEL REMOVAL:

Remove the lint drawer. Remove the four screws

located just below the loading door. Tilt the top of

thepanel out andlift thepanel up andaway fromthe

dryer.

UPPER FRONT PANEL REMOVAL:

Remove the four screws located just above the top

loading door. Tilt the bottom of the panel out and lift

the panel up and away from the dryer.

Unplug two connections on the exhaust hi-limit at

the left of the lint box. Also disconnect the two

connectionsfor thelint drawerswitch, locatedat the

back of the lint box. The lint box may now be pulled

out through the front of the dryer.

Unplug the motor harness.

For MDG31, remove two screws above the lint

drawer. For MDG 51,77, also remove two screws

beneath the gasket on the left and right side of the

lint drawer. Also, unplug the exhaust temperature

probe.

LINT BOX/BLOWER ASSEMBLY REMOVAL:

TOP COVER REMOVAL:

Firstremovethe back guard,thefour screws holding

topcover. Next pull top cover toward the rear of the

dryer and lift up.

Tilt the bottom of the panel out and lift the panel up.

Align support rod into hole to support control panel.

Disconnect the electrical connections. Remove

screw from hinge to remove the control panel.

LINTDRAWER

SWITCH

EXHAUST

HI-LIMIT

For Models MDG31,51,77

SUPPORT

ROD

DOOR

SWITCH

For Models MDG31,51,77

SERVICE

SWITCH

450274-4 MaytagCo. 5

GAS VALVE/IGNITION SYSTEM REMOVAL:

Be sure to shut off the gas main and then proceed

to remove electrical connections and screws

indicated. Remove lower front panel. Disconnect

union and screws noted with arrows.

By removing the top screws you will be able to

remove the burner tube. After, removing the top

burner, without damaging the Hot Surface Ignitor,

remove the whole gas valve assembly. Be careful

during assembly not to damage the Hot Surface

Ignitor. Replace assembly in the reverse order.

Inspect all wires to be sure all lead directly toward

the front of the dryer. Be sure no wires are caught

on the burner tube or ignitor.

To remove motorized impellor assembly:

Remove the six hex nuts shown with arrows. Now

pulltheblowermotorassemblyapartfromtheblower

housing. Remove the four phillips screws shown

with arrows and separate the motorized impellor

from the blower motor mount.

To remove motorizedimpellor assembly, removelint

housing cover, lint screen, and the four screws

shown with arrows. Pull the motorized impellor

assembly out through the opening.

For Models MDG31,51,77

Gas Valve Ingnition System

6 MaytagCo. 450274-4

OVEN HOUSING COMPONENTS:

GAS VALVE/IGNITION SYSTEM COMPONENTS:

BURNERTUBE

IGNITOR

GAS VALVE

For Models MDG31,51,77

OVEN CHAMBER

RADIANT

SENSORS HOTSURFACE

IGNITOR

Dual Burner 51,77

RADIANTSENSOR

BURNER HIGH-LIMIT

GAS VALVE

HOTSURFACE

IGNITOR

TUMBLER SUPPORT

WHEEL ASSEMBLY REPLACEMENT:

The front wheel assemblies can be replaced with

the lower front panel removed. Remove the three

bolts by reaching upward with a socket or box

wrench. The illustration below is provided to show

the location of these wheels as the wheels cannot

easily be seen while standing in front of the dryer.

All wheel assemblies are mounted on slots to allow

foralignmentofthetumbler. Afteroneormorewheel

assemblies are replaced, the tumbler must be

realigned.

The left rear wheel assembly can be removed with

just the back guard removed. The rear right wheel

requires removing the back guard, heat duct, and

oven. Be sure to mark the position of rear wheel

brackets prior to removal (refer to photo right).

For Models MDG51,77

For Models MDG31

450274-4 MaytagCo. 7

Adjust the tumbler position by loosening the three

bolts and forcing the wheel assembly toward the

center of the dryer to raise the tumbler and to move

it away from the side. A large screwdriver can

provide the necessary leverage. Adjustment of the

front of the tumbler is made by equalizing the gap

onthetop,bottom,leftandright bymovingthewheel

assemblies.

TUMBLER ALIGNMENT:

Proper alignment is achieved by making the gap

between the tumbler and openings in the front and

rear bulkheads equal on all sides.

The front to bulkhead may be checked for accuracy

by using a thickness gauge. The rear gap is not

accessible. Marking the position of the rear wheel

brackets before removing the brackets will help in

replacing the tumbler back into it’s original position

when the wheel brackets are reinstalled.

Below, both wheel assemblies are adjusted correct

and spacing is even on all sides.

EXAMPLES:

Intheillustrationstothe right, both wheelassemblies

must be moved to the right in order to move the

tumbler right. The left wheel assembly must move

a little more than the right in order to lift the tumbler.

8 MaytagCo. 450274-4

BELT REPLACEMENT:

Shut off electrical power to the dryer. Lockout and

tagout supply voltages. Followthe stepsto remove

front middle panel. Next you will remove either the

front bottom or front upper panel, depending on

pocket you are working on. Remove the belt from

the motor sheave. Next, remove the two screws

fastening the lint coupe to the front panel. Remove

the front panel screws, while holding up the

basket. Tilt the top of the front panel forward. Take

note of position of motor adjustment nut. Spin

counterclockwise to loosen tension. The old belt

can now be removed. Slide the new belt around

basket and push belt to a position close the motor

sheave.

PLACING THE BELT:

Nowthatthebeltisclosetothemotorsheave(Fig.1),

make sure the motor pivot is at it’s highest point.

Wrap the belt under the motor sheave (Fig.2), then

push the belt over the idler wheel (Fig.3). Once this

has been accomplished make sure to spin the

basketbyhandtoself align the beltonmotorsheave

and idler wheel. Tighten the motor adjustment nut

to position previous set.

FIG. 1

FIG. 2

FIG. 3

450274-4 MaytagCo. 9

MDG31 BELT REPLACEMENT:

Shut off electrical power to the dryer. Lockout and

tagout supplyvoltages. Follow thesteps to remove

front middle panel. Next you will remove either the

front bottom or front upper panel, depending on

pocket you are working on. Remove the belt from

the motor sheave. Next, remove the two screws

fastening the lint coupe to the front panel. Remove

the front panel screws, while holding up the

basket. Tilt the top of the front panel forward. Take

note of position of motor adjustment nut spin

counterclockwise to loosen tension. The old belt

can now be removed. Slide the new belt around

basket and push belt to a position close the motor

sheave.

PLACING THE BELT

BACK ON THE MOTOR SHEAVE:

Placebeltinstallationtool(BIT-P/N319582)overbelt

(Fig. 1) and rotate in a clockwise direction. While

rotating run BIT under motor sheave (Fig. 2).

Continueto spin BIT,beltwill thenwrap under motor

sheave (Fig. 3). Remove BIT from dryer (Fig. 4).

Next,you want to rotate basket slowly toensure it is

on the sheave completely. Tighten the motor

adjustment nut to position previous set.

FIG. 1

FIG. 4

FIG. 2

FIG. 3

10 MaytagCo. 450274-4

Electrical Component Locations

SAIL SWITCH AND AXIAL PROBE ASSEMBLY:

Located behind back guard. Access doors are

provided. Backguard does nothave to beremoved.

ELECTRICAL PANEL:

Theelectricalpanelislocatedbehindthefrontmiddle

panel.

For Models MDG31

For Models MDG51,77

DOOR

SWITCH

COMPUTER

PANEL

COVER

ROTATIONAL

SENSOR

SWITCH

REVERSING

RELAY

COMPUTER

COVER

DOOR SWITCH

For Models MDG51,77

For Models MDG31

AXIAL

PROBE

SAIL

SWITCH

BURNER

HIGH LIMIT

AXIAL

PROBE

SAIL

SWITCH

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