McCulloch M1638 User Manual
REPAIR PARTS MANUAL
MODEL NO. M1638 (96011021301)
16.5 HP 38"
Lawn Tractor
532 40 78-75 09.26.07 AP Printed In the U.S.A.
HOW TO USE THIS MANUAL
This manual is designed to provide the customer with a means to identify the parts on his/her tractor
when ordering repair parts. The illustrations may or may not represent the actual assemblies; therefore,
it is not recommended to use this manual as a guide to assemble or disassemble the tractor. Some
hardware and parts are drawn larger in order to more readily identify them.
Each tractor has its own model number.
The model number for your tractor can be found on the fender under the seat.
When ordering parts, always give the following information:
• Product - “Tractor”
• Model Number - “M1638 (96011021301)”
• Part Number
• Part Description
TABLE OF CONTENTS
SCHEMATIC ................................................................................................................ 3
ELECTRICAL ............................................................................................................ 4-5
CHASSIS ..................................................................................................................6-7
DRIVE........................................................................................................................8-9
ENGINE ................................................................................................................. 10-11
STEERING ............................................................................................................12-13
SEAT .......................................................................................................................... 14
DECALS ..................................................................................................................... 15
MOWER DECK .....................................................................................................16-17
MOWER LIFT ........................................................................................................18-19
2
TRACTOR - - MODEL NUMBER M1638 (96011021301), PRODUCT NO. 960 11 02-13
SCHEMATIC
SCH03
BATTERY
S
RED
AMMETER
(OPTIONAL)
S
B
M
A1
G
L
A2
RED
A
RED
FUSE
WHITE
BLUE
CLUTCH / BRAKE
(PEDAL UP)
BLACK
BLACK
GRAY
REVERSE SWITCH
NOT IN REVERSE
BLACK
DIONELO
STARTER
ATTACHMENT CLUTCH
(CLUTCH OFF)
BLACK
SEAT SWITCH
(NOT OCCUPIED)
SHORTING CONNECTOR
BLACK
M
BLACK
GRAY
IGNITION SWITCH
CIRCUITPOSITION
OFF
RUN/OVERRIDE
M+G+A1
B+S+A1START
B+A1
B+A1RUN
“MAKE”
L+A2
BLACK/WHITE
IGNITION
UNIT
BLUE
HOUR
METER
(OPTIONAL)
CHARGING SYSTEM OUTPUT
3 AMP DC @ 3600 RPM
ORANGE
DIODE
14 VOLTS AC MIN. @ 3600 RPM (LIGHTS OFF)
BLUE
RED
LIGHT SWITCH
FUEL
LINE
FUEL SHUT-OFF
SOLENOID
LIGHTING SYSTEM OUTPUT
5 AMP AC @ 3600 RPM
BROWN
NOTE
YOUR TRACTOR IS
EQUIPPED WITH A SPECIAL
ALTERNATOR SYSTEM.
THE LIGHTS ARE NOT
CONNECTED TO THE
BATTERY, BUT HAVE THEIR
OWN ELECTRICAL SOURCE.
BECAUSE OF THIS, THE
BRIGHTNESS OF THE LIGHTS
WILL CHANGE WITH ENGINE
SPEED. AT IDLE THE LIGHTS
WILL DIM. AS THE ENGINE IS
SPEEDED UP, THE LIGHTS
WILL BECOME THEIR BRIGHTEST.
3
SPARK PLUGS
GAP
(2 PLUGS
ON TWIN CYL. ENGINES)
BLACK
28 VOLTS AC MIN. @ 3600 RPM
(CHARGING SYSTEM DISCONNECTED)
STATOR
BLACK
HEADLIGHTS
NON-REMOVABLE
CONNECTIONS
REMOVABLE
CONNECTIONS
WIRING INSULATED CLIPS
NOTE: IF WIRING INSULATED CLIPS
WERE REMOVED FOR SERVICING OF
UNIT, THEY SHOULD BE RE-INSTALLED
TO PROPERLY SECURE YOUR WIRING.
REPAIR PARTS
TRACTOR - - MODEL NUMBER M1638 (96011021301), PRODUCT NO. 960 11 02-13
ELECTRICAL
L02
22
2
90
33
30
34
40
79
26
21
41
27
43
24
42
25
28
With Ammeter Option
D.C. AMPERES
45
Without Ammeter Option
48
With Service Minder Option
46
Without Service Minder Option
52
16
16
94
29
92
93
4
REPAIR PARTS
TRACTOR - - MODEL NUMBER M1638 (96011021301), PRODUCT NO. 960 11 02-13
ELECTRICAL
KEY PART
NO. NO. DESCRIPTION
1 532 16 34-65 Battery 12 Volt 28 Amp
2 874 76 04-12 Bolt Hex Hd 1/4-20 unc x 3/4
8 532 17 66-89 Case Battery Mech Hiinge
16 532 17 61-38 Switch Interlock Push-In
21 532 18 37-59 Harness Asm Light W/4152j
22 532 00 41-52 Bulb Light #1156
24 532 12 47-80 Cable Battery 6 Ga. 11"red
25 532 14 61-47 Cable Battery
26 532 17 51-58 Fuse
27 873 51 04-00 Nut Keps Hex 1/4-20 Unc
28 532 12 47-73 Cable Ground 6 Ga 12"black
29 532 19 27-49 Switch Seat
30 532 19 33-50 Switch Ign
33 532 41 19-33 Key/Chain
34 532 11 07-12 Switch Light
40 532 19 74-28 Harness Ign
41 871 11 04-08 Bolt Blk Fin Hex1/4-20
42 532 13 15-63 Cover Terminal Red
43 532 19 25-07 Solenoid
48 532 14 08-44 Adapter Ammeter
52 532 14 19-40 Protection Wire Loop
79 532 17 52-42 Socket Asm Bulb Twistlock
90 532 18 04-49 Cover Terminal Battery
92 532 19 66-15 Harness Pigtail Console ROS
93 532 19 25-40 34 Screw Plastic 10-14 x 2.0
94 532 19 18-34 Module Reverse ROS
NOTE: All component dimensions given in U. S. inches
1 inch = 25.4 mm.
5
REPAIR PARTS
TRACTOR - - MODEL NUMBER M1638 (96011021301), PRODUCT NO. 960 11 02-13
CHASSIS
29
212
17
208
26
30
25
31
209
11
159
26
24
209
18
26
28
39
24
278
25
5
5
9
209
208
207
64
206
209
35
209
2
33
142
209
10
37
209
35
142
35
205
38
209
34
38
205
1
13
145
37
208
26
Chassis-Elite_Basic_6
6
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