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STUDY COURSEfor Home Appliances
UNDERSTANDING DRYER: MECHANICAL COMPONENTS
Module 3LIT 787850 Rev. B
DRYER
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All r igh ts rese rved . No por t ion of th i s book may be
reproduced in any formw ithou t w ri t ten p ermiss ion from WHIRLP
OOL CORPORATION.
1989, 1993, 1996, 2001 WHIRLPOOL CORP ORATION
WHIRLP OOL CORP ORATION does n ot as sum e an y resp on sibil i
tyor any l i ab il i ty in conn ec t ion w i th the use o f th i s
manua l .
The t rade ma rks WHIRLPOOL , , , an d FSP a re reg is te
redtradem arks of Whir lpool Corporat ion .
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INTRODUCTION
The ma terial present ed in this module is int ended to provide
you with a n u nderst an ding of thefundam enta ls of gas a nd
electric dryer ser vicing.
Major a ppliances have become more sophisticated, tak ing th em
out of the screwdriver an d plierscategory. Their electrical
circuits include several different types of automatic controls,
switches,hea ter s, valves, etc.. Semicond uctors, solid-stat e
contr ols, and other component s usu ally associat edwith r adio
and t elevision electr onic circuits ar e being engineered into aut
omatic washers, dr yers,
dishwash ers, refrigerat ors and microwave ovens.
The appliance technician is emerging into a professional status
of his own. He must preparehimself now to be able to perform his
dut ies today as well as to reta in his pr ofessiona lism in th
efuture.
No longer is on-the-job tr ain ing sufficient to prepa re t
echnicians for t he complicated pr ocedur esrequired for t odays
sophisticated applian ces. This tr aining can best be obtained th
rough organizedclassroom study and application. However, much of
the knowledge necessary to service todaysappliances can be obtained
thr ough study cour ses. Completion of th is an d other cour ses
will provideyou with sufficient understanding of appliances and
their operation to enable you to do minorservice. It will also
serve as a valu able stepping stone t o more a dvanced stu dy and
on-th e-job tra iningto impr ove your s ervicing sk ills.
Informa tion cont ained in th is module is used on WHIRLP OOL
appliances.
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TAB LE of CONTEN TS
PAGECHAPTER 1 - MECHANICAL COMPONENTS
.................................................................
3
Lin t Sc re e n
.........................................................................................................................
3Fr on t Be ar in g an d Se al
...................................................................................................
3Do or S e a l
............................................................................................................................
3Do or Hi n ge
.........................................................................................................................
4Door Strike/Door Catch
..................................................................................................
4Leveling Feet
.....................................................................................................................
4Dr iv e Mot o r P u lle y
...........................................................................................................
4Id le r P u lle y
........................................................................................................................
4
Dr iv e B e lt
...........................................................................................................................
5Lin t Ch u te
..........................................................................................................................
5B lo w e r Hou s in g
................................................................................................................
6B lo w e r Wh e e l
.....................................................................................................................
6He at e r B ox
.........................................................................................................................
6Manifold Cover
.................................................................................................................
6Dr u m
....................................................................................................................................
6Dr u m Baf fle
.......................................................................................................................
6Be a ri n g Ri n g
......................................................................................................................
7Re a r Dru m S e a l
.................................................................................................................
7Support Roller
..................................................................................................................
7Ro lle r Sh af t
........................................................................................................................
8Bu lk h e ad
............................................................................................................................
8Lin t Ale rt
............................................................................................................................
8Re a r Se rv ic e P an e l
...........................................................................................................
8
TEST
..............................................................................................
See Test Book LIT787852
* NOTE: We recomm end t ak ing the TEST for MODULE 3 , r i gh t
a f t e r stud y ing it .
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LINT SCREEN
The lint screen is locat ed in th e right r ear of the top,un
der t he lint screen cover, and is used to catch lintas th e air
leaves the dryer drum.
Failure to push the screen all the way down couldcause lint to
pass under the bottom of the screen.This could cause lint to build
up in your exhaustsystem, causing a possible fire ha zard.
FRONT BEARING an d S EAL
The bearin g and sea l is locat ed on the inside flan geof th e
front cabinet pan el and is used to support t hedrum a nd mak e a
seal between the front dru m andpan el openings.
When r eplacing this sea l, make su re t he folded edgeof th e
seal is facing away from the front cabinet pan eland the two holes
in the bearing fit over the tworubber plastic clips.
Reduced air pressure in the drum during operationdra ws the sea
ls in and effectively seals the dr um ends.
The two seals, one at th e back and one at t he front ,are the
points most su sceptible to leaking. If eith erdoes n ot seal
effectively while th e dru m is rotat ing,there would not be enough
air passing through theheat er box.
If air is allowed to leak in through any point otherthan the
heat source, drying efficiency is greatingaffected. Not only is the
lack of heated air a factor,but i t must also be remembered that
the heater isgenerating a predetermined amount of heat. If
notenough air is passing t o car ry off the heat as fast a si t i s
being produced, the excess ive temperaturebu i ld ing up in the hea
t duc t w i l l open a h igh -temperature-limiting safety
thermostat switch andshu t off the heat source.
DOOR SEAL
This part is located on the rear door panel and isused to form a
t ight seal between th e door a nd frontcabinet pan el when t he
door is closed.
When replacing this seal place a bead of siliconeru bber
adhesive/sealan t ar ound the groove in the reardoor pa nel. Place
the door sea l with th e round sidein th e groove in the r ear door
panel.
CHAPTER 1
MECHANICAL COMP ONENTS
3
DOORSEAL
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DOOR HINGE
There a re different types of door h inges tha t couldha ve been
used on dryers.
These hinges ar e used to support t he door.
DOOR STRIKE / DOOR CATCH
These two parts fit together and hold the door in aclosed
position.
Models were built with either the cat ch or st rike onthe front
cabinet pan el and the mat ing part on therea r of th e door.
LEVELING FEE T
These plastic or m etal feet ar e screwed into the frontan d
rear corn ers of the dr yer.
DRIVE MOTOR P ULLEY
The pulley is located on the end of the drive motorand is used
with t he drive belt in order to turn thedrum.
IDLER P ULLEY
This part is located below th e drum an d in line withth e drive
motor pu lley.
The function of this part is to supply tension t o thedrive
belt.
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CATCH
STRIKE
SET-SCREWTYPE SCREW-ON
TYPE
STEEL PLASTIC
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DRIVE BELT
The drive belt fits aroun d the dr um , under t he idlerpulley,
an d a round th e motor pu lley. The m otor pu lleymoves the belt
which turns the drum, causing theclothes to tumble. The idler
pulley mainta ins dru mbelt tension.
NOTE: It is recommended that anytime the front
cabinet panel is removed, the drive belt be checkedfor frayed
spots or wea r, and replaced.
V-belts an d pu lleys ha ve been chan ged several timess i n c e
t h e y w e r e i n t r o d u c e d . T h e b e l t m u s t b
ecompatible with the correct pulley for proper rpm.There are also
belts and pulleys with five grooves.However, a 4-rib belt can be u
sed on a 5-rib pulley.
Belt Vees must fit evenly into the grooves on themotor pulley.
If the Vees are out of the grooves,higher-than-normal drum speeds
will be attaind,causing the c lo thes to c l ing to the drum s ides
,resul t ing in prolonged drying t ime or excess ivewrin king of
cloth ing.
For proper tumbling of garments, all dryer drumsshould revolve
at 48 rpm s or 55 r pms if it is a compa ctdryer. Always check t he
ser vice par ts list to be sur etha t you ha ve the corr ect belt
for t he model you arerepairing. An incorrect drum drive belt or
one notfitt ing in th e pulley grooves can cause very h igh dru
mspeeds.
To inst all the drum belt, begin by removing t he dr yerfront pa
nel. Then place th e belt over th e drum in thedriving position, an
d insta ll it u nder the idler pulleyand over the motor pulley.
When a ssembling the belt on th e motor pu lley, firstform a sm
all loop, then slide the drive belt u nder theidler pu lley. Push
the idler a ssembly to th e right, an dat th e same t ime place the
loop of the belt over theend of the m otor pulley.
LINT CHUTE
The lint chute is locat ed in th e right r ear corn er. Thelint
screen is housed in this par t.
Air pa sses thr ough the screen an d chute before it isexhaust
ed to th e out side.
5
.279 .279 .244
3-RIBS93-7/8" Long
3-RIBS91-7/8" Long
4-RIBS92" Long
DRIVEMOTOR
IDLERPULLEY
MOTORPULLEY
DRIVE BELTLOOP
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BLOWER HOUSING
The blower housing is located in t he ba ck of the dr yer.
The blower wheel and th ermostat s are h oused in th ispar t
.
BLOWER WHEE L
The blower wheel pulls the air out of th e drum an dpushes i t
out the exhaust du ct.
HEATER BOX
The heater box houses the heat element on electricdryers and
carries the heat from the gas burner toth e drum on gas models.
This heat is pulled into the dru m ar ea by the blowerwheel.
MANIF OLD COVER
This part is locat ed behind the bulkh ead an d in frontof the h
eater box.
DRUM
The dru m is the large, round cont ainer m ounted forrotation
within the cabinet. Wet clothing is placed
within th e drum , to be heated an d tum bled dry.
Baffles with in th e dru m lift a nd t umble th e clothin
gduring drum rotation.
DRUM BAFFLE
The dru m baffle is at tached to the inside of the dr um,and is
used to tumble the clothes when the drumturns .
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DRUM
CUT-OUTS INCABINET
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BEARING RING
The bearing ring snaps into place within the roundopening in th
e front of the dr yer drum . This bearingring rides on the outer
surface of the bearing andseal fastened t o the outside of the
flange formed inthe center of th e front cabinet pa nel.
To insure the minimum of air leakage and proper
drum alignment when r eplacing the bear ing ring, thebearing and
seal should be chan ged at the sam e time.
REAR DRUM SEAL
The rea r dr um seal is used to keep cool air from beingdrawn
into the drum area and the heated air fromescaping.
It is cemented to the rear of the drum and rides onan em bossed
area of th e bulkhead.
Reduced air pressure in the drum during operationdra ws the sea
ls in and effectively seals the dru m ends.
The two seals, one at th e back and one at the front,are the
point s most su sceptible to leaking. If eitherdoes n ot seal
effectively while th e dru m is rotat ing.There would not be enough
air passing through theheat er box.
If air is allowed to leak in through any point otherthan the
heat source, drying efficiency is greatlyaffected. Not only is the
lack of heated air a factor,
but i t must also be remembered that the heater isgenerating a
predetermined amount of heat. If notenough air is passing t o car
ry off the heat as fast a si t i s being produced, the excess ive
temperaturebu i ld ing up in the hea t duc t w i l l open a h igh
-temperature-limiting safety thermostat switch andshu ts off the
heat source.
SUP P ORT ROLLER
These two rollers ar e located on the bu lkhead. Theysupport t
he rear of the drum while the drum t urns.
The dr um ha s a groove (shown below) embossed intoits outer
circum ference, which a cts a s a tra ck for therollers. The tr ack
keeps the drum in alignmen t withthe bulkhead an d the front pa
nel.
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ROLLER GROOVE
BULKHEAD
FRONT
REARDRUMSEAL
REARDRUMSEAL
BULKHEAD
ROLLER SHAFT
DRUM SUPPORTROLLER
DRUM
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ROLLER SHAFT
These two shafts are located on th e bulkhead.
The dru m support r ollers ride on th em.
BULKHEAD
This par t is locat ed inside the cabinet, an d is used asa back
for the drum and supports the sides of thecabinet.
This bulkhead also supports parts of the heat andair
systems.
NOTE: This bulkhead can be touched up, if it hasbeen
scratched.
LINT ALERT
This lint alert is locat ed on t he lint chut e. When thelint
screen is blocked with lint, the lint a lert soundsoff a musical
tone informing the consumer to cleanthe lint screen.
REAR S ERVICE PANEL
This par t is locat ed on th e back side of th e cabinet. Itis
used to cover all of the components on the rear of the unit .
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BULKHEAD
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BLANK
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BLANK
