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dvance copyfor urdn nce Office on]?tlH @ |D 78S 97 TM
W R DEP RTMENTTECHN ICL MNU L
O R D N A N C E M A I N T E N A N C EP O W E R T R A IN U N IT T H R E E - P I E C E
M F F E R E N T I A L C A S E F O R M E D I U M T A N K S M 3 fl A N D M O D I F IC A T I O N S
MARCH 1 1942
REGR DED UNCL SSIFIED YAUTHQWTYOF DOD DIRBY
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RESTRI TETM 9-1750
ORDNANCE MAINTENANCEPOWER TRAIN UNIT THREE-PIECE DIFFERENTIAL CASEFOR MEDIUM TANKS M3 M4 AND MODIFICATIONS
Prepared under the direction of thehief of Ordnance
ONTENTS
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INTRODUCTION
1. PURPOSE
2. SCOPE
3. REFERENCES.
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RP2
FG
OWTNUT
In
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DESCRIPTION
4 CONSTRUCTION
FIOURE 2 NTERIOR OF DRIVER S COMPARTMENT
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DESCRIPTION
fig. 3 .
FIGURE 3 REA THERS USED ON POWER TRAIN
5 OPERATION
fig. 47b.
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4
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RA PD 5252SUMP
FIGURE 4OIL SYSTEM OF THE TR NSMISSION WITHOUT OIL COOLER
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:o O
RPD5
FGURE
LSYSTMINTRNMSOEQUIPPEDWTHOLCOOLER
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REMOVAL OF THE POWER TRAIN UNIT FROM HULL
6 GENERAL.
7 STEP S IN REMOVING POWER TRAIN UNIT FROM HULLEquipment.
b e necessary tofig. 94)
fig. 7 .
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RA PD 4888FIGURE 6 TURNING E ENTRI TO LOOSEN TRACK
FIGURE 7 TRACK B ROK E N A H E A D OF FRONT WHEEL
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f
PD 937
FIGURE 8RIGHT SID E OF DRIVER S COMPARTMENT
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fig. 5).
slowly.
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RAPD2
FGURE9OWETNCRRIERUNDEPOWETN
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t
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RA PD 2941
FIGURE 11 POWER TRAIN PARTLY PULLED OUT OF TANK
Ul Li i . s . . ; ' rvs
FIGURE 12 POWER TRAIN COMPLETELY OUT OF TANKRA PD 2942
15
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DISASSEMBLY OF COMPONENT SSEM LIES
8 TRANSMISSION ANDPARKING BRAKE ASSEMBLY
b. Equipment.
figs. 13 and14).
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RA PD 2943
FIGURE 13 CUTAWAY OF PARKING R KE
fig. 23fig. 15).
disassemble transmission. NOTE conditions,
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TM 9 1750 O R D N A N C E M A I N T E N A N C EP O W E R T R A I N U N I T , T H R E E - P I E C E D I F F E R E N T I A L C A S E F O R M E D I U M T A N K S
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D I S A S S E M B L Y O F C O M P O N E N T A S S E M B L I E S
FIGURE 15 BRAKE DRUM P U L L E R
fig. 19 .
18 ,
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SO^k
mr3O
RAP
FGURE1T
MSOGEARASSEMBLES
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D I S S S E M B L Y O F C O M P O N E N T S S E M B L I E S
RA PD 2948
FIGURE 17 TRANSMISSION SHIFTING B RA CKETS
2
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RA PD 2949FIGURE 18 TRANSMISSION ON STAND
Vs-\n.
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T 91750 O R D N A N C E M A IN T E N A N C EP O W E R T R A I N U N I T T H R E E P IE C E D I F F E R E N T I A L C A S E F O R M E D IU M T A N K S
FIGURE 20 RANSMISSION REMOVED FROM DIFFERENTIA L
FIGURE 21 EAR SHIFT LEVER ASSEMBLY
24
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T M 9 1750D I S S S E M B L Y O F C O M P O N E N T S S E M B L I E S
- R A P D 2953FIG UR E 22 INION G EA R END OF TRANSMISSION WITH B EARING COVER REMOVED
RA P D 2954
FIGUR E 23 P ECIA L W RENCHESUSED ON PINION INPUT AND COUNTERSHA FT NUTS25
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RA PD 295SFIGURE 24 INION GEAR PUL L E R
fig. 23 .
24 .
fig. 23 .
fig. 25.
fig. -5)
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TM9-1750D I S S S E M B L Y O C O M P O N E N T S S E M B U E S
I _. mFIGURE 25 AISING TRANSMISSION COVER
R P D 2957FIGURE 26 RANSMISSION WITH COVER REMOVED
27
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TM 91750 O R D N A N C E M A I N T E N A N C EP O W E R T R A I N U N I T T H R E E - P I E C E D I F F E R E N T I A L C A S E F O R M E D I U M T A N K S
R PD 958
FIGURE 27 EMOVING FOURTH SPEED GEAR WITH A LOCKING ARM PULLER
, . * .-PR .. -^W ' ' .c ^ s sm R PD 2960F IG URE 28 SHIFT ROD SUPPORT B LOCKS AND INTERLOCK S
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T M 9 1750D I S S S E M B L Y O F C O M P O N E N T S S E M B L I E S
RA PD 2961FIGURE 29 NPUT SHAFT LIFTING NUT
fig. 27).
fig. 28).
40).
29)
(-fg- m.31).
29
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to
HSPEEDGER
RPD96
FGURE3
NPUTSHFSSEMBL
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RA PD 5251FIGURE 32 OIL PUMP USED IN TANKS EQUIPPED WITH OIL COOLER
fig. 33 .
fig. 34 .slowly.
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D IS S S E M B L Y O F C O M P O N E N T S S E M B L I E S
RA PD 525
FIGURE 33 WORKING PARTS IN OIL PUMP EQUIPPED WITH OIL COOLER
fig. 37).
fig. 39).
fig. 40).
fig. 40).
33
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TM91750 O R D N A N C E M A IN T E N A N C EP O W E R T R A IN U N IT T H R E E - P IE C E D I F F E R E N T IA L C A S E O R M E D IU M T A N K S
OUTPUTSH FT L IFTING NUT
OUTPUTSHAFT SSEMB L Y
R PD2964
FIGURE 34REMOVING UTPUTSHA FT34
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D I S A S S E M B L Y O C O M P O N E N T A S S E M B L I E S
FIGURE 35 OOL USED TO REMOVE RE A R COU NTERSHAFT B E A R INGfig. 40).
fig. 40).
40).
fig. 40).
35
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9
POU
3OU
S
AM
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D IS S SE M B L Y O C O M P O N E N T S S E M B L IE STM 91750
FIGURE 37REMOVING COUNTERSHAFT ASSEMBLY
FIGURE 38 OUNTERSHAFT ASSEMBLYRA PD 4832
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FIGURE 39 FIRST SPEED IDLER GEAR B E ING REMOVED
fig. 40).
fig. 40).
fig. 42).
fig. 45).
38
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R PD
FIGURE 41 ECOND AND THIRD SPEED SYNCHRONIZER
fig. 45).
fig. 45).
fig.45).
fig.44).
fig. 46).
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RPD5
FG
4SC
ANTHRDSPEEDSNOZDS
MED
s i
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R PD 5258
FIGURE 43 FOURTH AND FIFTH SPEED SYNCHRONIZER
9 SPROCKET AND HUB ASSEMBLIES Equipment.
10 FINAL DRIVE ASSEMBLIES Equipment.
figs. 47 and 48 .
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RAPD5
FGU
4FOHAFF
S
SHOZDS
MB
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FGURE4N
SHFSSEMBL
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T M 9 1750
R A PD 4836
FIG URE 46 OUNTERSHAFT A SSEM B L Y
fig. 49).
fig. 50).
fig. 50).
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RA PD 4851
FIGURE 48 INAL DRIVE UNIT REMOVED FROM ASSEMBLY
figs. 5 and52).
fig. 52.
11 STEERING BRAKE ASSEMBL IES. Equipment.
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T 9 1750D I S S S E M B L Y O F C O M P O N E N T S S E M B L I E S
FIGURE 51 EMOVINGFINALDRIVE SHAFT
FIGURE 5 FINAL DRIVE SHAFT AND BEARINGRA PD 4855
49
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fig. 53).
figs. 19 and 54).
RA PD 4856
FIGURE 53 EMOVING COMPENSATING DRIVE SHAFT
fig.20),
fig. 55).
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FIGURE 54 EMOVING STEERING BRA KE ASSEMBLY
FIGURE 55REMOVING BRA KE SHOE FROM HOUSING
RA PD 857
PD 48S8
51
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TM 9-1750D I S S S E M B L Y O C O M P O N E N T S S E M B L I E S
12. DIFFERENTIAL ASSEMBLY. Equipment.-
54).
figs. 47 and 54).
47, 57 and 64).
{figs. 47, 58, 59 and 64).
NOTE: fig. 59)
figs. 47, 58 and 60).
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FIGURE 57REMOVING DIFFERENTI L ROM HOUSING
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D I S S S E M B L Y O F C O M P O N E N T S S E M B L I E S
RA PD 4867
FIGURE 58REMOVING D IFFERENT IA L BEARING
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RA P D 4868
FIGURE 59 IFFERENTIA L BEARING FIXTURE
47, 60, 64).
figs. 47, 62and64).
fig. 62).
figs. 47, 61, 63and 64).
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RA PD 4871
FIGURE 61 EMOVING PINION GEAR NUT
b
58
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R PO4S7FIGURE 6 EEDLE BE RINGREMOVERANDNEEDLE BERINGDRIVERS
COMPENS TING CASE COVER
EVEL GEA R
FIGURE63 REMOVING BEVEL GE R
R PD4873
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RPO
Cn
FGURE6IFRENTLSSEMBL
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MAINTENANCE
13 PARKING B RA KE.
14 TRANSMISSION a
d. Snap ring on fourth
65)
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TM 9-1750 O R D N A N C E M A IN T E N A N C EP O W E R T R A I N U N I T T H R E E - P I E C E D I F F E R E N T I A L C A S E F O R M E D I U M T A N K S
MASTER SPACERHORSESHOE WASHER
BEARING RACEGEAR
65L B S . REQUIREDTO SEAT BEARINGS
I ' P P R CYLINDERHORSESHOE WASHER
RO L LERS
DE
DLs
___
R
) \
r ^ f_
L
_-_
N O T E : TH CORRECT SPACER THE LATERAL PLAY OFTH E GEAR SHOU L D BE.002 TO .004BEFORE TH E ASSEMBLY S MOUNTED ON THE SHAFT.
RA PD 5248FIGURE 65 IXTURE FOR DETERMINING WIDTH OF SPACERS FOR
TAPER-ROLLER BEARINGS62
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MAINTENANCE
fig. 65),
f. Oil collar.
g. Interlocks.
Oil
Cleaning and inspection.
15 REMOVE STEERING BRAKE SHOE ASSEMBLY
Equipment.
Procedure. ])
63
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figs. 66and67).
fig. 66). be
Disassemble reassemble brake shoe assembly.
FIGURE66 REMOVING LINK PINFROMC M
-fa
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RA PD 4864
FI6URE 67 PULLING BRAKE SHOES OUT OF HOUSING65
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MAINTENANCE
Install brake shoe assembly. figs.66, 67 68 .
fig. 92)
i. Adjust steering brake nut.
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ASSEMBLY OF COMPONENT ASSEMBLIES
16. DIFFERENTIAL ASSEMBLY Equipment.
Procedure.
R P D 4875
FIGURE 69-REPLACING PINION AND GE R IN RIGHT HALF OF COVER
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T M 9 1750A S S E M B L Y O C O M P O N E N T A S S E M B L I E S
figs.62 and 64).
RA PD 4876
FIGURE 70 EPL ACING PINION AND G E A R IN LEFT H A L F O F COVER69
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figs. 64 and 69).
figs. 64 and 69).
IMPORTANT:
figs. 59 and 71).fig. 59)
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S S E M B L Y O F C O M P O N E N T S S E M B L I E S
RA PD 4877MGURE 71 EP LACING D IFFERENT IAL BEARING
71
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FIGURE 72 MEASURING DIFFERENTIAL SHIMMING WITH DEPTH MICROMETER
figs. 47, 72 and73).
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Assemble transmission. a)figs. 74 and 76).
FIGURE 74FIRST SPEED IDLER SHAF T EXTENDING THROUGH COVER P LATE
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TM9-1750A S S E M B L Y O C O M P O N E N T A S S E M B L I E S
CAUTION:
b)
c) fig.46).
d)
e) fig. 42).
f) fig. 44).
g) figs. 30 and 45).
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h) figs. 36 and 40).
i) fig. 31).
76
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FIGURE 77 UTPUT SHAFT AND COUNTERSHAFT SUPPORTING FIXTURES
76 and 77).
p) fig. 78 .
r)
s) fig. 79).
79
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slowly,t) fig. 28).
u) figs. 80 and 81).
v)
FIGURE 78 OIL PUMP WIRING
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S S E M L S S E M L I E S
i
IMPUT SHAFT ASSEMBLY
FIGURE 79 EPLACING INPUT SHAFT ASSEMBLY
RA PD 4842
81
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FIGURE 80 REPLACING KEYS IN OUTPUT SH FT
RA P
FIGURE 8 GEAR DRIVING TOOL
8
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S S E M B L Y O C O M P O N E N T S S E M B L I E Sw)
x) figs. 82 and 84 .
fig. 82).84).
y)
RA PD4845
FIGURE 82 UTPUT SHAFT BEARING DRIVER
83
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R PDFIGURE 84 INPUT SH FT BEARING DRIVER
FIGURE 85 EASURINGPINIONBEARING SHOULDER WITH DEPTH GAGE
85
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fig. 23)
ff) fig. 18).
gg) fig. 14).
hh)
fig. 23)
ii) figs. 13 and 14).
jj) figs. 13 and 14).
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kk)
II)
R PD 4879
FIGURE87 CHECKING B C K L SH WITH G GE
mm)
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RA PD 4881
FIGURE 88 BEARING SURFACES
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RA PD 4882
FIGURE 89 INION BEARING SHIMS2) Assemble transmission with differential. a)
b)
fig. 17 ,
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CAUTION:
(c)
fig. 88)
(ee).
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b).
18. STEERING B R A K E ASSEMBLIES. . Equipment.-
RA PD 4860
FIGURE 90 REPLACING BRAKE SHOES
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A S S E M B L Y O F C O M P O N E N T A S S E M B L I E S
Assemble steering brake assembly. a)fig. 47).
CAUTION:
b) fig. 56 .
RA PD 4861
FIGURE 91 DJUSTING CENTERING BOLT
93
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e) figs. and 92).
fig. 92)
fig. 68).
f)
g) a), b),c), d), e) f)
Assemble steering brake assembly with differential assembly. a)
b)
c)a)
b)19. FINAL DRIVE ASSEMBLIES . Equipment.-
Vs- m.
Procedure. Assemble final assembly. a)fig. 47).
CAUTION:
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CAUTION:
b) fig. 50).
c)
d) fig. 50).
e)fig. 47).
f) fig. 48).
g)b), c), d) e)
Assemble final drive assemblies to steering brake housings. a)
b)
c)
d)a), b), c)
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A S S E MB LY OF POWER TRAIN AND RELATED P A RT STO HULL
21. INSTALL POWER TRAIN IN HULL. Equipment.-
Procedure.
RA PD 4884
FIG URE 93 ULLING POWER TRAIN INTO HULL
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R PD 886
FIGURE 9 ULLINGTRCKOVERDRIVESPROCKETS
94, 95, 97 and 98.
98
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RA PD 4887
FIGURE 95 ULLING ENDS OF TRACK TOGETHER
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LIST OF MAJOR OVERHAUL TOOLS
Mark Quantity
jacks
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REFERENCES
23 TECHNICALMANUALS AND FIELD MANUALS
24 STANDARD NOMENCLATURE LISTS
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P O W E R T R A I N U N I T , T H R E E - P I E C E D I F F E R E N T I A L C A S E F O R M E D I U M T A N K S
L I S T OF ILLUSTRATIONSFigure Jitle
41 Second and third speed synchronizer ....................... 40
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L I S T O F I L L U S T R T I O N S
Figure Title Page
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Figure Title Page
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INDEX TO TEXT
cover 7
below)
re r 83
gasket ......................... 80
output shaft gears
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I N D E X T O T E X TBro ke, parking Co n t inued age
illustrated 13, 18i ns ta l l ing 87-88
maintenance of 61relining 61
Brake, s teer ing, assem b lies See a/so Brakeshoe an d B rak e shoe as semb ly )
adjus t i ng 4assem bl ing 92-95disassemb l ing 47-50
i l lu s t ra ted 51lever , operation of 6
Brake ad jus tmen t 63-67il lustrated 66
B rake d rumassemb ly 93-94
instal l ing on output shaft. 87in s tal li ng in housing 93-94
d isassemb l ing 17
illustrated 52Brake linkage co nnect ing . 99Brakes, relining
parking 61steer in g 64
i l lu s t ra ted 64 65 66
Cam, r emov in g l in k pin from. 64Carrier power tran 12, 99
i l l ust ra ted 13, 14Co m p ensat ing cas e
i l lu s t ra ted 46 54 60C o m p e n sat in g gears 70Co m p ensat ing drive sha f t , removing. 50Compensa t ing sha f t , rem ov ing 52Co nn ec t i ng hook , t rack, illustrated. 104
assem bl ing 75bearing i ns tal l ing 84-86disassem b l ing 40-42h ou sing, insert in g in 75il lustrated 37 45r emov ing 33
i l lus trated 37
Co ver plate differential Pagei l l us t ra ted 46 51rem o v ing 53
Co v er , tr ansmission
remo ving 26
Depth gage illustrated 85Different ial assem b ly
as sem b l ing 68-73cover plate 53
illustrated 46 51descr ibed 6-7d is assemb l ing 53-58h o u s ing, remov ing from illustrated.... 54il lustrated. 46 51 54 55 56
57 58 59 60 71Disassembly o f c o m p o n en t as sembl ies . 16-58
differential as semb ly 53-58bearings end 53co m p en sat ing case 53-58cover pate 53holder pate 53i l lus trated 54 55 56
final drive assem bl ies . 42-47cover 47
herringbone gear. 45p in io n and gear 45
sp rocke t and h ub assembl ies . 42steer ing brake as sembl ies. 47-53
b ush ings , brake sh aft, removing. 53c om p ensat ing shaft. 52-53co m pensat ing drive shaft. 50different ial removing from. 50
shoes, brake 50-52transmiss ion and parking brake
assemb ly 16-42bearing cover , front. 22-26brake d rum 17
coun te rsh af t assemb lyd isassemb l ing 40-42releasin g at front. 22-26remov ing 33dr ive s h af t cover. 47
gear four th-speed rem o v ing 29gearsh i f t lever assemb ly . 19-22gears, rem ovin g 19-22inpu t s h af t assemb ly
cap s rem oved 22d isassemb l ing 38-40re leased at front. 22-26rem ov ing 29
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N
Page
location of 4
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I N D E X T O T X TPage
Pinion gearbearing, removing 22-26nut, removing, illustrated 58puller, illustrated 26
Power, how transmitted 5Power train carrier. 12, 99
described 12illustrated 13, 14
Power train unitassembly of 68-97construction of 4-5described 4-7disassembling 16-58illustrated 3installing in hull. 98-104
102, 103, 104lubrication of 6-7maintenance of 61-67oil, draining from 19operation of 5-7removing from hul 9-12
Puller, illustratedbrake drum 19
pinion gear 26Pul-lift 100
Remover, needle bearing 56Reverse
c lu t ch gear, removing 35idler gear, removing 33
Roller bearings, spacer width of 61-63il lustrated 62
Shifting 5
causes of difficulty in 61Shifting block
installing 80removing 29
illustrated 28
Shifting forks, assembling. 77-78Shifting r o d s
.assembling 77-78removing 29
Shimming, checking for. 86Sh i m s
differential bearing 72-73illustrated 73
Sh i m s Continued Pagepinion bearing 90-92
illustrated 90Speedometer drive assembly
removing 22Sprocket and hub assemblies
disassembling 42
Steering brake assemblies See soSteering brake sh oe assembly)
assembling 92-95disassembling 47-53
Steering brake bands, adjusting 4Steering brake lever, operation of 6Steering brake shoe assembly
adjusting 95illustrated 2, 93, 94
assembling 67
inspection pate 95replacing in housing 94-95connecting 99disconnecting II
Subfloorremoving 11-12replacing 99
Synchronizer cones cau ses of difficulty inshifting 61
Synchronizer gearsclutch, trouble with 61operation of 5-6
Synchronizersassembling 75disassembling 38-40
illustrated 41iHustrated 40removing 33
Tools See ls o Equipmentgear driving, illustrated 82hook, track connecting, illustrated 104puller, locking arm, illustrated 28puller, pinion gear, il lustrated 26remover, needle bearing 56
illustrated 59special, for:
countershaft, bearing, removingdescribed 33
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I N D E X T O T E X Tge Page
87 7 - 7 88 6 - 8 7
8 37 5
1 7 - 4 2
. . . . . . . 2 9
. . . . . . . 29
. . . . . . . 2 8' . . . . . . . 3 3. . . . . 4 0 - 4 2. 3 5 3 7 4
. . . . . . . 2 6; 2 7
. . . . . . . 1 9
. . . . . . . 2 3. . . . . 2 2 - 2 6. . . . . 1 9 - 2 2. . . . 2 0 2 1
. . . . . 1 2 - 4 0. . . . . . . 44: . . . . . . 29. . . . . . . 3. . . . . . . 2 9. . . . . 2 9 - 3 2. . . . . . . 3 1. . . . . . 2 9. . . . . 3 2 - 3 8. . . . 3 4 3 6. . . . . . 2 9