Bell T-300 series User manual

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HOWARD W. SAIU!S &

The lieting of any available replacement part herein does

not constitute in any case a recommendation, warranty or

guarantyby Howard W. Sams & Co. , Inc. , ae to the quality

and suitability of euch replacement part. The numbers of

these parte have been compiled from lnformation furnished

to Hovard W. Sams & Co., Inc. , by the manufacturers of

cQ458

G (o.r I ll C. lndianapotts 6, lndtana

BEtt ,YlODEt T-3OO Series

(ch. RP-32O, RP-3aOA, R.P-32t)

the particular type of replacement part listed. Repro-

duction or user without express permission, of editorial or

pictorial content, in any manner, is prohibited. No patent

liability is assumed with respect to the use of the lnforma-

tion contained herein. @ 1962 Howard W. Sams & Co. , Inc. ,

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GENERAL INFORMATION

The Bell T-300 Series Tape Transports are hvo speed with pushbutton controls.

An automatic stop is provided to turn the take-up motor off aJter the tape has passed

through the transport to prevent damage to the tape.

Electro-Dynamic braking is used to provide instant braking without strain, stretching,

or breakage of tape.

All models using theT-300 Series Tape Transports are identical mechanically. The only

dilference is the head arrangement and preamplifier used.

The recording and playing time using 7 L/ 2 ips or 3 3/ 4 ips is as follows:

These recorders are to be connected to an outlet supplying ll? volts, 60 cyeles AC.

Manufactured By:

Bell Sound Division

Thompson Ramo Wooldridge lnc.

6325 Huntley Road

Columbus 24, Ohio

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Indianapolis 6, Indiana.

DATI 2-62 Printed in U.S. of Amerlca

sET 560 r0tDtR 5

Tape Length

In Feet 4 Track Stereo 2 Track Stereo

7 Ll2LPS ,r J/ + I"taD 7 LlZrPS 3 3/4 rPS

150

225

300

600

900

1200

r800

2400

7 L/ 2 min.

ll /4 min.

15 min.

30 min.

45 min.

I hr.

L L/ 2 hts.

2 hrs.

l5 min.

22 L/ 2 min.

30 min.

I hr.

I lrl 2 hrs.

2 hrs.

3 hrs.

4 hrs.

3 3/4 min.

5 5/ 8 min.

7 l/ 2 min.

l5 min"

22 L/ 2 min.

30 min.

45 min.

I hr.

7 L/ 2 min.

1l /4 min.

l5 min.

30 min.

45 min.

I hr.

I /2 hrs.

2 hrs.

Tape Length

In Feet 4 Track Monaural 2 Track Monaural

IL/2 IPS 3 3/4 rPS 7 Ll2tPs, 3 3/4 rPS

rou

215

300

600

900

1200

r800

2400

ro mtn.

221/ 2 min.

30 min.

I hr.

I /2 hrs.

2 hrs.

3 hrs.

4 hrs.

.tu mln.

45 min.

I hr.

2 hrs.

3 hrs.

4 hrs.

6 hrs.

8 hrs.

't L/ z mrn.

ll / 4 min.

15 min.

30 min.

45 min.

I hr.

I l/2 hrs.

2 hrs.

15 min.

22 L/ 2 min.

30 min.

I hr.

I l/2 hrs.

2 hrs.

3 hrs.

4 hrs.

FIG.I TOP VIEW OF MECHANISM

DESCRIPTION OF MODELS

Mo&l T-slots a 2 trackmonaural record-play- back and 4 track stereo playback tape deck requtring

back tape deck requtrtDg tlle RP-321 preamplitie!. the RP-320 or RP-320A preampliJier.

Model T-313 lE a 2 track at€reo record-play- Mo&l T-333 ia a 4 track st€reo lecord-play-

back tape deck requiring tleRP-320 o! RP-320A pre- back ard 2 track ateleo playback tape deck lequiring

amplifi€r. the RP-320 or RP-320A preamplifier.

Mo&l T-321 ls a 2 track - 4 track stereo play- Model T-$3? is a Model T-333 tape deck with

back tape deck requirtrg a stereo anplilie! witll tape tlre RP-320 or nP-320A instaUed.

head ilputs. Model T-338 ls- a Model T-33? installed ln the

Model T-323 la a 2 trask stereo recotd-play- 300-CC portable carrylng case.

FUNCTION OF CONTROLS

3 314 ips Fast Rervind

_ When tbl8}ey iE depre8sed, the capstar lever Bydepresslng this key, the tape \yill be lewound

(75) t8 actuated and leaveg the motor piyot so tlle onto the supply reel to any desired place at a rapid

3 3/4 ips drive on the motor will engage with drlve rate od apeed.

puUey (668)on the capstan.

7 rl2 ips Fast Forward

Bydepressing thls key, the tape will be advanced

When tlfe key iE depressed, lt releases the onto t}Ie ta.ke-up reel to any deaired place at a tapid

3 3/41p8 key sotle capstan Iever (lb)wt[ be actuated rate of spe.^d.

by moto! spting (82) causing the motor (5?) to pivot

so the 7 I/2 ips drive on the motor wilt engage witll Standby

driYe pulley (66A)on tlle capatan. This keytums thepower ontothe tape tlalaport,

off opens the head aasembly so the tape can be threaded,

and releases the run, stop, fa^st revlnd, or fast for-

The power to tlle tape tlansport is sa'itched df ward keya from tlle depreased posltion.

and dleengages the capstal motor idle! drives when

depressed, Head Selector

RUn Set the switch to2-T for 2-track tape and to 4-T

lor 4-track tape.

Deplessing tiis key places ttre tape transport

illto operation.

Page 2

OPERATI NG

Threading the Tape

l. Depress the standby key.

2. Place a reel of tape on the supply spindle (2).

3. Place an empty reel on the take-up spindle (2).

4. Unwind approximately12 inches oftape from the

supply reel, hold asection taut and insert itinto

the head slot opening.

5. Insert the free end into one of the slots in the

take-up reel. Turn the take-up reel a few com-

plete revolutions to secure the tape to the reel

and to take all slack up between reels.

Playback

l. Connect the outputs of the preampliJier being

used to the inputs of an amplifier.

2. Depress the Standby key. It turns the AC power

on and opens the head assembly.

3. Place the Selector Switch or Switches in play

position.

4. Place a reel of tape on left-hand supply reel,

and thread the tape through the head slot opening

and between the capstan and pressure roller.

Place an empty reel of the same size on the

right-hand take-up reel and turn the reel in a

counterclockwise direction to fasten the tape to

the reel and to remove all slack between reels.

5. Switch the Head Selector Switch to 2-T for two

track tape and to 4-T for four track tape.

6. Placethe rubberreel retainerson thereel stand

hubs.

?. Depressthespeed keyforthe desiredtapespeed.

8. Depress the run key.

9. Adjust the volume controls, on stereo record-

ings, until the two meters are balanced. On

monaural recordings, adjust the volume control

to the desired listening level.

Recording

l. Connect the sound source to be recorded to the

proper input receptacles on the preamplifier.

2. Thread a blank tape onto the transport.

3. Depress the desired speed key.

4. Set the Head Selector Switch to 2-T on models

T-313 and T-323 and to 4-T on models T-333,

T-33?, and T-338. The four track models will

also record 2 track when used with blank or

bulk-erased tape.

5. Depress the interlock buttons, just to the left of

the record/ playback head, and move the levers

tothe rightto place thetransport in record oper-

ation.

6. Adjust the volume controls until the meters are

I NSTRUCTI ONS

fluctuatingin the centeror upperhalf of the black

area for 7 l/ 2 ips speed. Adjust slightly lower

for 3 3/ 4 ips speed.

?. Depress the Run key.

8. When the recording is finished, set the selector

switches to play and then depress the standby

key.

Rewind

To rewind a tape, depress the key with the

arrow pointing toward the left.

Fast Forward

To advance the tape, depress the key with the

arrow pointing toward the right,

2 -Track Monaural Recording

l. Thread the tape. See 'Threading the Tape".

2. Connect the signal source tothe left channel in- _

pur. - a

3. place the left channel in record position. j F

NOTE: Keep the right channel in play position ,i :,

and the votume turned down. .B g

4. Make the recording. ; F

5. After the recording is completed, reverse the P -r

reelsl rethread the tape, and make a recording !{ j.

on the other half of ttre tipe. " B 6

6. Toplay backthe recordings, usethe teitctrannet P !

output. € f

4 -Track Monaural Recording t, d'

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I. Thread the tape. See ,Threading the Tape". 3

2. Connect thesignal source to the teft channel in-

put.

3. Place the left channel in record position.

NOTE: Keep the right channel in play position

and the volume turned down.

4. Make the recording.

5. After the recording is completed, reverse the

reelsl rethread the tape and make a second

recording.

6. Place the left channel in play position and turn

the volume down.

?. Connect the signal source to the right channel.

B. Reverse the reels, rethread the tape, and place

the right channel in record position.

9- Make the recording. p

10. After the third_recording is completed, reverse E

reels, rethread tape, andmakefourthrecording.,i

Page 3

ll. After thefourth recording iscompleted, thetape

is wound onto the take-up reel and the first re-

cording is then ready for playback.

12. Use the Ieft channel to play back the first and

second tracks andthe right channel forthe third

and fourth tracks.

Microphon e Recordings

I. PIug the two microphones into the two micro-

phone input jacks.

2. Place the microphones six feet in front of the

group to be recorded.

3. Place the microphones approximately six feet

apart.

Phonograph Recording

l. Connectthe record changerto inputof thestereo

amplifier.

2. Connect the tape head output leads to the proper

input of the preamplifier. See Head and Pre-

amplifier Hookup.

3. Connect the preamplifier to the input of the

stereo amplilier.

4. Place the tape recorder in record position.

5. Place the record or records to be recorded on

the record changerand place the record changer

into operation,

Radio Recording

l. Connectthe tapetransport to astereo amplifier.

2. Connect a stereo tuner to the stereo amplifier.

3. Tune to the desired program and record it as

outlined in "Recording".

N0TE: A stereo tuner or separate AM and FM

tuners may be connected to the high Ievel

inputs on the rear of the tape transport

preampli.fier.

lnstalling a RP-320 or a RP-320A Stereo Record/

Playback Preamplifier or a RP-321 Monaural

Record /Playback Preampl if ier

I. Remove the gold aluminum cover plate (5) by

removing the screws at each end.

2. Remove the green control panel (44) by removing

the screws at the front corners.

3. Depress tt,eS 3/ 4 ips speed key andthe standby

key.

4. Place the tape transport on its right side.

5. Rotate the preamplifier equalizer switch shalt,

on the RP-320 extending from the right side,

fully clockwise.

6. Place the equalizer switch operating lever

assembly on the equalizer switch shaJt and

temporarily position it against ttre preamplifier

Page 4

chassis on the RP-320. Tighten the set screw

finger tight.

7. Turnthe gold record-interlockkeys sothe higher

sections are to the left toward the mike input

jacks.

B. Place the record-play indicator vanes on the

control shaJt with the pins on the vanes inter-

locking the slots in the outer control ring. When

the selector switches are in the play position, the

white plastic play sections of the vanes should

face each other with the lettering horizontal.

Place a felt washer on each control shaft

9. Hold the preampli.fier in position and feed the

two twisted-pair meter leads through the small

hole in the deck plate.

I0. Place the preamplilier equalizer switch shaJt

through its hole in the motor mounting bracket

on the RP-320. Place the preamplifier in its

correct position while guiding t}te record-inter-

lock keys into their slots.

ll. Insert two sheet metal screws into thetop panel

of the preamplilier through the deck platel four

sheet metal screws into the rear panel through

the rear edge of the deck plate; and two sheet

metal screws into the front panel through the

front edge of the deck plate.

12. Recheck the equalizer switch shaft to be sure it

isturned fullycloekwise andis not binding inthe

clearance hole on the RP-320.

13. Loosen the set screw on the equalizer switch

operating lever assembly and slide it down the

sha,ft until the black steel pin fits into the slot

inthe motor shiftbracket onthe RP-320. Tighten

the set screw.

14. Connect thelong end of the equalizer armspring

(Part #7?A7l) over the steel pin in the equalizer

switch operating assembly on the RP-320 and the

short endto the leftrear corner ofthe transport

power supply chassis.

15. Connect the head leads to their appropriate re-

ceptacles on the preamplifier. See Head and

Preamplifier Hookup.

16. Mount the record level meters onto their bracket.

l?. Feed the meter leads through the hole in the

meter bracket and connect the leads to the

meters.

18. Fasten the meter bracket to the transport deck

with two sheet metal screws.

19. Install the new control panel on the deck plate

and fasten it with the two small brass screws

that held the original panel.

20. Place the black selector switch lever knobs on

thesha"fts over the record-play indicator vanes.

Be sure they interlock with the outer control

shaft slots. Place the lever knobs in the center

position between the two sections of the gold

interlock keys. The indicator vanes should

have their white play sections in line and level.

The selector level knobs will not move to the

FIG.2 BOTTOM VIEW OF MECHANISM

right or record position until the interlock keys 22. Knock out the two meter punch-outs in the long

are depressed gold aluminum trim cover and install it using the

zr. place the volume contror knobs on the center mounting screws at each end'

control shafts.

Models T-3 13, T-323 , and

or RP-320A Preamplif ier

HEAD AND PREAMPLIFIER HOOKUPS

T-333 With a RP-320 Left tape head input of a stereo amprifier.

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l. Connecttheleft channel, White recordr/ playback

head lead to the L Record Head receptacle.

2. Conneet the right channel Yellow rccord/ play-

backhead lead tothe R Record Head receptacle.

3. Connect the left channel Red erase head lead to

the L Erase Head receptacle.

4. Connect the right channel Blue erase head lead

to the R Erase Head receptacle.

T.321

l. Connect the left channel White head lead to the

Connect the right channel Yellow head lead to

the Right tape head input of the stereo amplifier.

Connect a ground wire between the ground shell

of one of the inputcables tothetransport chassis.

T-310 with a RP-320 Preamplifier

l. Connect theWhite record,/playback head lead to

the Record Head receptacle.

2. Connect the Red erase head lead to the Erase

Head receptacle.

Capstan shaft, pressure roller (26), support

gurde post (22) record-playback heads (16), and (t9)

and erase head (15), may accumulate tape coating

oxide, which is wornoff tape as it passes these parts.

Clean these parts with head cleaning solvent or with

petroleum solvent. Never use cleaning fluids on tlre

capstan shaft, beeause the fluid may run down

shaft and into the bearings.

CAUTI0N: Never clean the record-playback

heads or erase head with a metal object

because they could be damaged.

CLEAN ING

LU BR I CATI ON

the

and

Lubricants applied during manufacture will last

for a long time. However, if parts are replaced, or

after each 1r 000 hours of operation, lubricate as

follows:

l. Apply one'drop of #10 motor oil to the top and

bottom bearing of the take-up motor (bl) and

rewind motor (74).

2. Apply one drop of #10 motor oil to the top

bottom bearings of capstan motor (57).

CAUTI0N: Be certain that nooil seeps onto the

motor pulleys.

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Page 5

3. Apply one drop of #10 motor oil to the top and roller (26) bearing.

bottom capstan bearings. N0TE: Only a small amount of oil is needed on

CAUTI 0N: Be sure no oil seeps onto the drive each biaring. It is better to use too little

pulleys(66A)and (66E) or onto any part of rather than too much. Oil on running sur-

the capstan shalt extending above the top faces, between motor pulleys and rubber

deck plate. idlers, could cause poor drive or no drive

atall, aswellas excessivewow andflutter.

4. Appiy one drop of #10 motor oil to the pressure

MECHAN I CAL ADJ U STMENTS

Reel Stands twoallenset screws and raise or lowerthe reel stands.

Tighten the allen set screws to secure the reel stands

Ttre reel stands are to be adjusted so the tape in place.

does not rub on the reel edges. To adjust, loosen the

ELTCTRI CAL ADJUSTMENTS

Oscillator Model RP-32I (Erase Head) A8 for I. 5V

With the unit operating in record position, measure Record Equalization

the oscillator plate voltages (pins I and 6 of Vb) with

an AC VTVM. Adjust the oscillator coil (Al, Models Connect a l00Q + l% resistor in series with the low side

320, 320A, or .A6, Model RP-32I) forequal voltages, of the record hEad. Connect an AC VTVM across the

approximately I00V RI!fS AC.

Bias

resistor. Remove the bias oscillator tube. Inject a

ISKC Audio signal to the high level input jack and adjust

the equalizer coil to peak at ISKC (Repeat procedure

for second channel on stereo models).

Connect al00Q+ l%resistor inseries with thelow side

of the record h6ad. Connect an AC VTVM aeross the Record Level Meter

resistor. With the unit operating in record position,

adjust as follows: Remove the bias oscillator tube and disconnect the

record head. Set unit for record, 1 l/ 2 ips operation.

Models RP-320, R.P-320A (4 Track Head) Inject a lKC audio signal to the high level input jack.

Left Channel 3 3/4 ips A2 for.02V Adjust volume control for 3.?5VRMS atthe record

Models RP-320, RP-320A (2 Track Head) head jack (measured with AC \ITVM). Adjust record

Left ChanneL? L/2 ips A3 for.055V level meter adjust control, R3 or R4 (RP320), R?0

Models RP-320, RP-320A (4 Track Head) (RP32l) Rl04 or Rl05 (RP320A), until indicator eoin-

Right ChanneL 3 3/ 4 ips A4 for .02V cides v/ith the intersection of the red and black areas

Models RP-320, RP-320A (2 Track Head) (Repeat procedure for second channel on stereo

Right ChanneL 7 L/ 2 ips A5 for .055V models).

TROUBLE CHART

Symptom Cause Remedy

Poor tape drive in Playback l. Oil or grease on driving sur- l. See "Cleaning".

and Record. faces of the drive wheel(66A)or

(66E) and on upper pulley on

capstan motor (57).

2. Oil, grease, or tape coating 2. See "Cleaning".

oxide on pressure roller (26)

and on upper portion of capstan

shaJt.

No tape drive at 7 l/ 2 Lps l. Motor spring (82) disconneeted l. Replace motor spring (82).

speed in playback and Re- or missing.

cord.

No tape drive at 3 3/4 ips l. Motor spring(?8) disconnected l. Replaee motor spring (?8).

speed in Playback and Re- or missing.

cord.

Take-up reelwill not takeup l. Looseset screw (3)inreel plat- l. Tighten set screw (3).

tape in Playback or Record. form (2) causing reel pladorm

to slip on motor shaJt.

No rewind. l. Loose set screw (3) in supply l. Tighten set screw (3).

reel pladorm causing reel plat-

form to slip on rewind motor

shaJt.

Page 6

TROU BLE CHART ( CON.T. )

Symptom Cause Remedy

Tape rubs against edge of

reels. Reel plaforms need adjusting.

Loose rewind-take-up motor

mounting bracket.

See 'Reel Plaform" under

'Mechanical Adjustments ".

Tighteh the two screws on each

end of the deck plate.

Tape spills during rewindor

fast forward. l. Memoryswitch needs adjusting. l. Remove the electrical chassis

cover off tttetape transport. The

memory switch positions itseU

one way when the rewind key is

depressed and the otherway when

t}te f astf orward key is depressed.

Slightly bend the switch with a

pair of long-nosed pliers.

Tapedoes notstop. Dynamic

Brakes notfunctioning prop-

erly.

Weak selenium rectifier.

Rl63 or Rl64 open. Replace selenium rectiJier.

Replace Rl63 or R164.

Tape spills during Rewind

when Stop key is depressed. l. RI64 open. 1. Replace R164.

Tape spills during FastFor-

ward when Stop key is de-

pressed.

l. Rl63 open. l. Replace R163.

MECHANICAL PARTS LIST

i.l

;

23*

83B?9

89A12

83Ar9

89B32

89A14

89All

9lBlr06

89A13

9rAr04?

3685

3684

36827

36816

368r7

36815

36826

36817

36812

?7A50

91A1046

75A13r

72A67

A23822

63A3

83A4

A23822

63A3

9tB4?

63A5

7?A9

7rAl9

72874

86A-8

9rA4l

86A8

9rA42

71A40

71L25

72A63

76.A36

67x'24

89A27

89A28

89A26

86A84

89A10

?2.A66

72A'65

72Cr35

3584

35C8

864'?

72B.479

72A52

?2A493

6rA6

35C16

Reel Retainer

Reel Plafform

Bristol Set Screw 8-32 x 3/i6 Stl.Pl

Cup Point

Counter Drive Belt (WALSCO #1410 -54)

Cover Plate

#6-32 x y 8 PHBHMS Gold Finish

Screw

Index Counter

Piano Key

Deck, Riveted Ass'y.

#6 xL/ 4 - Type Z, Gold PlatedScrew

Head Cover

#4 xL/ 4 - Type Z, Gold. PlatedScrew

#4 xl/ 4 - Type Z, PIIBHSMS,SU. Pl.

Erase Head Mtg. Ass'y. T-3l0rT-312

T-313, T-314, T-323, T-333

Erase Head T-310, T-312

Dual Erase Head T-313, T-323

Erase Head T-314

Erase Head T-333

Play-Record Head T-310

Play-Record Head T-312, T-313,

T-321, T-323, T-333

Lower Play-Record Head T-314

#6 -32 x 3/ I PHBHMS, Stl. Pl. Screw

#6 -32 x L/4 PHBHIIf,S, Stl. Fl.Screw

Upper Record-Playback Head, T-314

Record-Playback Head, T-321, T-323

T-333

Head Mounting Spring

Record-Playback Head Mtg. Assry.

Tape Guide Post

Yoke Retractor Coupler

Truarc Retaining Ring No. 5133-I8S-

MF-IIS

Nylon Washer

Pressure Roller

Truarc Retaining Ring No. 5133-18S-

MF-R,S

Nylon Washer

Pressure Roller Ass'y.

XP Bakelite Flat Washer

Toggle Spring

Counter Mounting Plate

Retractor

Record-Playback Pressure Pad

Pressure Pad Arm Subassembly

Erase Head Pressure Pad

Erase Head Pressure Pad Arm Ass'y

Pressure Pad Actuating Spring

Pressure Pad Arm Spring

Pressure Pad Yoke

Key Shaft

Retaining Ring

Control Panel

Control Panel Models T-3l0rT-313,

T-312

Control Panel Models T-32lrT-323,

T-333, T-337, T-338

Keys Bumper

Piano Key 3 3/4 ips and Stop

Key Coupler, Short

Key Coupler, Long

#6 -32 x 3/8 PHBHMS, Stl.Pl.

Motor Mounting Bracket

Take-up Motor

Alt. Take-up Motor

Insulating Felt Gasket

Capstan Support

Slide Return Spring

Motor Disengage Slide

Shoulder Type Screw

Capstan Motor Ass'y.

33*

34*

35*

36*

3?*

39*

40*

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Page 7

Description

A25382 I Right Capstan

820029P4I Grommet

820025P23 Spacer

Motor Support

SU. Phillips PI{L

Stl. Pl. Bristol Set

#6-32x3/8

Head Screw

#8 -32 x 3/ 16

Screw

Motor Fan

Fiber Washer

Felt Washer

Capstan Shaft and Drive Wheel Ass'y.

Includes Items 66A,668,66C,66D ,

and 66E

728484 I Slide Actuator Bracket

820089P73 Thrust Washer

825381

?9A8

A25255

73BII

3585

35C9

9141039

83Al

A25396PI

A25397PI

A25382

75A133

67X25

77A70

Capstan Yoke

Bearing, Centered Bronze

Bearing, Retainer

Flywheel

Allen Head Set Screw

Rewind Motor

Alt. Rewind Motor

Capstan Lever Ass'y.

Isolator

Drive Pulley

Motor Spring

Left Capstan Motor Support

Pivot Actuator Stud

Retaining RinB, Truarc #5133-12

Motor Spring

MECHANICAL PARTS LI ST ( CON'T. )

*9tBl0-60 Includes items

9IBl0-80 Includes items

. T-337, T-338

9IBll02 Includes items

23, 33, 36, 37, (1)

23, 33, 34, 35, 36,

23, 33, 34, 35, (l)

39, 40 (2 Heads) Assembly used on T-3I0, T-312, T-313

3?, 39, 40 (3 Heads) Assembly used on T-323, T-333,

39, 40 Assembly used on T-321.

A PHOTOFACT "EXPLODED" VIEW

@Howa,d W. Sams & Co., lnc. 1969

FIG.3A EXPLODED V IEW OF PARTS ABOVE DECK ASSEMBLY

Page 8

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A PHOTOFACT "EXPLODED" VIEW

@Howard V. Sam: & Co., lnc. 196?

F IG. 38 EXPLODED V IEW OF PARTS BELOW MOTOR MOUNTING BRACKET

Page 9

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