RENR1166-01

January 2001

M320 Excavator
Electrical System

6WL1-468

© 2001 Caterpillar Printed in U.S.A.

All Rights Reserved
 9 8 7 6 5 4 3 2 1

L27

L28
L A FUEL RD-6(4)
PUMP RD(12) BK(14)
TURN LAMP GP 5W-8633 FF N L29
116-9624 BK(9) < 01 < RD(12) RD-00 GY(6) WH(7)
L BK < 02 < GY(6) RD-00 R BK-00 GY(5) BU(13)
R L26 L30
TURN LAMP BK(9) RD(12) < 03 < GY(5) BU-10(1) MOTOR BK-10 W T WH(4) GN/BR(3)
5W-2040 L26 POS NEG POS NEG
BK GY(5) < 04 < WH(4) DISCONNECT BK(9) GN/BU(5)
A SWITCH L31
BK GY(6) < 05 < BK(9) BK/GN(8) BK/YL/WH(2)
7N-0718
WH(4) < 06 < BK BU-10(1) WH(3)
P

RD-4
12V BATTERY FF BLADE REAR
L BK/GN(8) (QNTY 2) RD-6(4) BK/GN(6) L27 SOLENOID
RD(12) BU-10(1) TO BOX 3T-5760 BK-6 BK-6 GN/WH(2) 8U-6424
STOP LAMP RD(26) BK BK BK-00 RD(25) BU/YL(3)
9X-4493 BK BK GN/BU(1) BK
L6
BK BK(14) BK/GN(4) BR
TRAVEL TO FRAME BU(13) GN/BU(2) BB Y
ALARM STEER SW BU < 5< RD(25) BK/YL/WH(2) BR(1) RIGHT REAR BR < 04 < TO UNDCRG
3T-1815 STABILIZER < 03 < BK BK

GN/YL
TAIL LAMP GROUND BK < 2< BK BK/WH(3) GN/BR(4) BU
5W-2040 L23 LOCKOUT SOL. D TRAVEL LOCK
GY(5) BK/GN(8) STEER SW PU < 6< BK BK/GN(7) BK(8) < 02 < BK G
F GY(9) BK GOV.SWITCH OR < 4<
X
RD-4
X
SUPPL STER GN/BU(5) GN/BU(3)
8U-6424
< 01 <
A1
BK(1) < 01 < BK(2) BK < 01 < BK
MAGNET
116-1146
F
BASIC LAMP GP MOTOR A2
A BATTERY + RD < 1< RD(8) SUPPL STER L86 BK/GN(6) GN/WH(3) BK(2) < 02 < BK(3) L31
< 02 < WH
116-9625 W 118-9168 L28 A3
KEY SWITCH YL < 3< RD(32) RELAY RD-12 GY(3) AA BK(3) < 03 < BK(4) BRAKE TO FRAME BU(13) TRAVEL
3E-0075 W L86 Y A4 LIGHT SW PEDAL SW
GY(9) DUMP VALVE BR < 7< RD(31) BK/GN(7) BK(4) < 04 < BK(5) C BK
MOTOR YL A5 8U-2158 136-9421
L15
BK R TERM (W) WH < 8< WH(15) BK <1 < YL WH(7) BK/WH(3) BR < 04 < BR GN/YL < 05 < BK REVERSE WH
T° A6 STER LIGHT
RD(26) SHUT D SOL PK < 9< BK <2 < GN(15) BK(2) BK/PU(2) BU < 03 < DK-BU < 06 < BK/WH(7) BK RD/YL(10) RD(6) BU(13) BK LEFT FRONT
W L19 A7 5W-9323 STABILIZER
GY(6) MAGN SWITCH GN < 10 < GN(14) BK(3) BK/WH(2) BR < 02 < GN/YL C K DD
LOCKOUT SOL
WH(4) EMS GR < 11 < BK(4) RD/YL(10) L29 BU < 01 < BK BU/YL(3) 0 8U-6424
UNUSED < 12 < BK(5) RD(6) FORWARD/REVERSE HORN/TURN SWING
W D GN/BR(3) BU(1) TRAVEL ALARM PRIMARY HIGH BEAM SW BRAKE SW TO CAB TO FRAME
SW (QNTY 2) STEERING 111-1975 8U-6109
AUX HYD AUX HYD SUPPLEMENTAL W RD(8) <1 < PU(3) L18 GN/BR(4) RD(25) GN/YL 9D-7032 LOW BRAKE BK(14) NC
(CCW ROTATION) (CW ROTATION) STEERING CONTROL A7 PRESS SW FLOW SW
WH(15) <2 < RD(8) GN/BU(1) 3E-6429 WH(7) GN/BU(5) GN/BU(1)
SOLENOID SOLENOID 132-6640 L30 Y A6 SWIVEL 5W-9972 C 71A H C
8U-6424 8U-6424 PU(3) <3 < WH(15) WH(3) BU-10(1) LEFT REAR 121-2974 BU(13) BK/GN(6) BR < 02 < BR
W STABILIZER A5 56B 56A NO
BK/GN(4) BK/GN(8) BR DK-BU 4 BK(4) BK/WH(2) BK BK RD(25) < 1 < BK GN/BR(3) < 01 < GN/BR C L34 DK-BU < 01 < BU
LOCKOUT SOL. A4 56
BK/GN(3) BK-4 GN/WH(2) BK(2) 8U-6424 L34
GN/YL BK 3 BK(3) C BK < 2 < BK GN/BU(2) < 08 < YL GN/YL < 04 < BR
L31 A3 L
C C GN/BR(2) WASHER BU/YL(3) BK(3) BK 2 BK(2) BU(1) BK/YL/WH(2) < 06 < WH/BK BK < 03 < BU
21 UPPER A2 W 54
BK/GN(3) BK/GN/RD(3) GN/BU(2) BK(4) DK-BU 1 BK(1) RD/YL(10) C BK(18) < 05 < BK/WH Z AA
8U-2598 L22 Z A1 L29 R
GN/BR(2) BK/YL/WH(1) BR(1) BK(5) TERMINAL RD(6) WH(3) < 04 < BK/GN
MOTOR BK/GN(4) < 03 < BK/WH/GN

L6
IMPLEMENT BK BK BK(8) BK-6 5W-3624 BU(1)
ACTIVATION C GN/BU(3) GY(5) RD(25) GN/WH(2) < 07 < WH RIGHT FRONT
SOLENOID L32 L27 STABILIZER
8U-6424 MAIN PUMP PRV GN/WH(3) GY(6) BK < 02 < BR AIR
SOLENOID HORN SW LOCKOUT SOL

L23
86 85 TO FRAME WASHER GY(3) RD(12) BU/YL(3) 8U-6424
C 123-0156 G LOWER 5W-9376
87 BK/PU(2) RD-6(4)
L34 L30 L30 GN/BR(4) < 02 <
8U-2598
BU-10(1) GN/BU(5) BK BR(1) < 01 <

L24 BK/YL/WH(2)
BK/GN/RD(3) OR(4) BK/WH(2) RD-12
30 MOTOR L86
BK BK(17) BK RD/YL(10) RD(31) BK/GN(8) BK/GN(6) TO < 04 < BR

BK/WH(3)
C

GN/BU(5)
BK/GN(7)

BK/GN(6)
87a RD(6) BK(9) GN/BU(1) PLATFORM < 03 < BU
C L33

WH(6)
WH(5)
BU(1) WH(4) BR(1)

L28
L32 Z BB
SUPPL STER GN/BR(4)
RELAY
117-4861 L34 L34

BK-6
TRAVEL RD-6(4) L86 L28 BLADE FRONT
ACTIVATION L86 SOLENOID
BK
BK
BK

SOLENOID L21 L33 8U-6424

8U-6424 SWING PUMP PRV C A
SOLENOID
C 123-0156 G L36
GN/BR(3) < 30 < YL(4) L51 RD/YL(16)
L82 L36 L36 MAIN FUSE L51
BK/YL/WH(1) BK PU(6) GN/BR(4) < 10 < BK/YL/WH(1) FF RD(10)
KL.30 124-0016
BK TO FRAME BK(16) GN/BU(1) < 21 < BK/WH(2) RD-8(3) A
L51 L36 BK/WH(2) BU-10(2)
WH(3) < 27 < A RD-8(3) 60A RD-8(1) YL(4) TRAVEL BEACON
ALARM 116-9627
SWING CREEPER BK/GN(4) < 12 < GN/WH(2)
MAIN-POWER
BK/YL/WH(1) A RELAY RADIO SPEAKER
BRAKE SPEED L37 119-2006 5W-8937
GN/WH(2) < 11 < GN/BU(2) 120-5970 RD(15) BK 122-2371
SOLENOID SOLENOID
8U-6424 8U-6424 PU(2) BU/YL(3) < 33 < FUSE BLOCK 111-2477 FUSE BLOCK 111-2478 YL(2) RD-12 87 30 A 86 85 F RD/YL(13) > 1> BK +BATTERY BU/WH(1) H BR/RD
L86

L19
GN/BU(1) GN/BU(2) < 36 < BK/PU(2) A BLACK B YELLOW RD/YL(3) RD(31) FF RD-8(2) RD-8(1) 87 BK/GN(8) > 2> BK ALARM 2.5A
A A H
C C BR/WH(3) RD-00 BR(1) < 25 < GN/WH(3) RD/YL(16) GY(5) A BK GN(6) BK/WH(2) > 3> BK PRESS.SW H PU(7) +BATT. BK
L20 L32 H

L18
L22 H 8 H 8 30
PU(2) BK/GN(5) BK(8) < 24 < GN/BU(3) RD-14(1) 7,5A RD/YL(2) RD-10(4) 7,5A YL(2) RD(16) GY(6) A BK BK BK(6) > 4> BK SHUTDN.SW REAR WORK FLOOD LAMP L75 RD ANTENNA BK/YL(1)
L38 85 86 LAMP AS. 120-6776
BK BK/WH(1) GN/BU(3) < 23 < GY(3) RD/YL(16) OR(1) RD/YL(13) RD(12) TO BOX 87a BRAKE BK GROUND RD ANTENNA SPEAKER ANTENNA
E G 7 G 7 L51 117-4861 120-6776 5W-9391 E

L33
YL (4) GN/WH(3) < 05 < RD/YL(10) 7,5A GN/WH(3) 15A RD/YL(3) RD(3) BU-10(2) BK RD(2) SPEAKER BR SPEAKER

BK
GY(3) < 39 < BK(7) RD(10) GN/BR(1) SPEAKER BR/RD 5W-8937
CONN 4 L37 F 6 F 6
GN/BU(1) BK/PU(2) < 40 < GN/WH(2) 7,5A GN/WH(1) 15A RD(16) BU-10(2) RD/YL(16) BK/GN(1) A BK BK BK BK GROUND SPEAKER

WH(4)
BK(9)
PARKING TRANSMISSION L86 BK/WH(2) < 16 < BK/GN(4) GN/WH(4) L71 RD(18) RD/YL(14) BK/GN/RD(2) BK BK BR
BRAKE SPEED E 5 E 5
RD/YL(10) < 29 < BK/GN(5) 7,5A GN/BU(3) RD-10(3) 7,5A RD(18) RD(19) RD/YL(15) BK/GN(1) 49a OUT (LAMP) FLASHER BK/GN/RD(1) RD(14) TO BOX

L28
SOLENOID SOLENOID L39 L50 L48 86 85
FUEL LEVEL RD(6) < 06 < RD(6) RD/YL(2) RD(16) BK/GN(4) C2 8U-9152 BU(10) BK/WH(6)
8U-6424 8U-6424 D 4 L72 D 4 87 L75
SENDER BU(1) < 34 < BR(1) GN/BU(2) 7,5A GN/BU(4) RD-10(2) 7,5A OR(1) GN/WH(1) RD(18) GN/BR(1) 49 + BATTERY BU(8) BK 1 2 GROUND RD BK(18)
112-7178 C 30 TRAVEL
< 14 < BK(8) GN/WH(3) RD(19) WH(7) 2 4 NC BK/WH(5) RD
C C 3 C 3 CUTOFF
BR/WH(3)
L21
GN/BR(2) < 15 < WH(3) 7,5A GY(1) 15A RD(3) GN/WH(4) OR(12) 86 85 BK C BK/RD(1) 87a YL(4) 4 1 PARK SW RELAY H C
BK BK BK/GN(3) < 02 < GN/BU(1) GN/BU(3) RD/YL(3) 87 BK 31 GROUND BK/GN(2) F TRANS SPEED BK/GN/RD(4) 3 6 +BATTERY 8U-7440 FLOOD-LAMP H
C B 2 B 2 117-4861 120-6776
BK/GN/RD(3) < 09 < GN/BU(1) 7,5A GY(3) 7,5A BK(7) GN/BU(4) RD(4) BK BU/YL(2) WH(14) 6 5 TRAVEL SOL BK DOME LIGHT BK(8) TURN SIGNAL

WH(3)
BK(8)
L72 30

WH(15)
DIODE BK/YL/WH(1) < 19 < GN/BR(2) GY(5) RD(19) GY(1) GY/BK(1) AEC A BK/GN/RD(2) WH(9) 5 3 PARK LIGHT YL(14) 5W-2041 LAMP AS.
L86 A 1 A 1 116-9626

RD-8(2)
AEC BOOM-CYL 8U-8045 BK < 20 < BK/GN(3) GY(2) 7,5A GY(4) RD-10(1) 25A BU-10(2) GY(2) BK/PU(1) AUX-HYD 87a BK/GN/RD(1) WH(2) 7 NC
SWITCH 1 PU(17) 117-4861
< 28 < PU(2) GY(6) GY(3) RD/YL(1) A BK A 8 NC BK BK
127-0925 4
BK LOW TRANSMISSION < 01 < GN/BU(5) GY(4) GY(2) 86 85 OR(13)
L77 TO FRAME
2 CLUTCH PRESS SW A
PU(2) < 26 < BK/GN(6) RD-10(4) GY(5) RD/YL(5) L87 PU(12) 87 86 85

L40
8U-9306 C
GN/BU(1) < 04 < BU(1) RD-10(3) GY(6) RD/YL(6) GN/BR(6) BK/GN/RD(4) RD/YL(15) 87 YL(2)
YL(4)
L20
BR/WH(3) < 08 < BR/WH(3)
KL.15
RD-10(8) RD(5) RD/YL(7) BK/GN(14) WH(8)
30
OR(12) GN/BU(3) 56B HEAD
LAMP AS.

OR(5)
30 56A 2U-4800
PU(16)

BK/GN(5) < 18 < BK/GN/RD(3) RD-10(7) RD/YL(14) RD/YL(8) 87a PILOT PRESS GN/WH(3)
C L41 L47 1 ENABLE POWER H 58
BK/WH(1) < 31 < WH(5) FUSE BLOCK 111-2479 FUSE BLOCK 111-2480 RD(10) RD(5) DIODE 117-4861 87a REFUELING GY(3) POSITION
BK

C GREEN D RED AEC AUX-HYD 2 F MODE PUMP SWITCH

HAMMER YL(4) < 32 < WH(6) A L73 RD/YL(1) BK(7) WH(9) 117-4861 YL(14) CIGAR LIGHTER LAMP
SOLENOID A 120-5969 3 8U-3011 5W-9628 31 5W-2033
DIODE WH(6) < 38 < BK/WH(1) RD/YL(5) RD(3)
A BK
8U-8045 8U-6424 H 8 H 8 5
AEC STICK-CYL D WH(5) < 13 < BK/YL/WH(2) RD-10(6) 7,5A RD(5) RD-10(8) 7,5A BK/PU(1) RD/YL(6) RD/YL(9) BK
SWITCH 1 PU(15) BK/YL/WH(2) < 35 < BK/GN(7) BK/PU(2) OR(12) YL(2) BU-10(1) BU-10(2)
127-0925 4 L24 G 7 G 7
BK BK BK WH(1) BK/WH(3) < 37 < BK/WH(3) 7,5A RD/YL(1) 7,5A GY/BK(1) RD/YL(7) GY(1)
2
BK BK BK/GN(7) < 22 < GN/BR(4) F RD(31) GN/WH(1) DIODE RD/YL(14) PU(4) BK-14
F 6 F 6 STOP LAMP
BK BK GN/BU(5) < 17 < GN/BR(3) 7,5A RD(10) 7,5A RD(4) BK/PU(1) RD/YL(2) A 86 85 H
L42 123-5635
RD(37) BK BK BK/GN(6) < 07 < BU/YL(3) RD/YL(14) L73 RD(8) BK/PU(2) OR(1) 87 UPPER WIPER
E 5 E 5 5 MOTORG 122-2367

RD(10)
BU(10)
PU(14)

WH(7)
GN(4) < 03 < GN(4) 7,5A RD/YL(7) 15A RD/YL(8) GY/BK(1) RD/YL(11) BK RD(11) H

GN(6)
BU/YL(5)

BU(8)
HYD OIL L74 4 30
L82
TO FRAME RD/YL(15) RD(4) RD(8) F TO CAB LOWER WIPER

YL(10)
BK

HIGH TEMP D 4 D 4
SW& SENDER BK(2) < 04 < GN/BR(3) 15A RD/YL(6) 7,5A RD/YL(12) RD(8) GY(4) 3
87a TEMP. MOTORG 6C-9156
116-4710 L19 L42 L43 2 117-4861
AEC IMPLEMENT DIODE BK(3) < 05 < GN/BR(4) RD/YL(13) RD/YL(8) GN/WH(4) BK/RD(2)

53A
31B
TRAVEL SWITCH C 3 C 3 1
8U-8045 T D PLUG

31
53
RD-00 OR(4) BK(4) < 21 < GN(4) 7,5A RD/YL(5) 7,5A RD/YL(9) RD/YL(9) GN/BU(4)

L46
117-0651 1 L83 120-5967 H
BK(17)
BK(16)

PU(5) BU(7) PU(6) BK(5) < 38 < BU/YL(3) RD/YL(11) RD/YL(10) RD/YL(12) BK/RD(1)
L17

BK/GN(2)

53A
B 2 B 2

31B
3
BK OR(3) YL(17) PU(3) < 27 < 7,5A OR(12) 20A RD-12 RD/YL(11) BK/PU(2) A BK RD/YL(16) >+ > BK(12) BK

31
53
L18 C

BK/GN(5)
2 <- <
T RD(9) WH(12) RD(8) < 01 < WH(4) RD(31) RD/YL(12) GN/WH(3) L38 BK/RD(2) BK BK GY(7)
A 1 A 1
HYD OIL BR/BK(1) < 40 < RD-10(5) 7,5A RD(28) RD-10(7) 7,5A RD/YL(10) RD/YL(13) GN/BU(3) GN(13)
86 85 A GY/BK(1) BK/GN(7)
RD(36) FILTER < 03 < RD/YL(11) F RD-12 GY(3) RD(13)
BRAKE LIGHT BK/WH(3)
CLOG SW A 87 CUTOFF SW
PU(11)

116-8514 HYD OIL WH(1) < 06 < GN/BU(4) RD/YL(15) RD/YL(10) RD(6) 124-8427 GY/BK(2) BK/PU(2)
LOW-TEMP 30
L10

BK < 07 < GN/WH(4) L38 RD(12)

SWITCH
D BK-12 YL(13) < 08 < GY(4) 87a A UPPER WINDSHIELD

L64
119-3400 L43 L43 L77
G DIODE D AIR TO FRAME BK A/C FAN BU(7) < 23 < RD(8) BK/GN(4) STOP LAMP GN(5) 122-2369
8U-8045 CONDITIONER RELAY L17 L47 117-4861 1 H
AEC SWING BK 85 86 123-6527 RD(9) < 30 < RD/YL(12) L39 L39 GN(3) B
SWITCH 1 FAN DIODE
PU(13) PU(12) T° PU(12) BR/BK(1) < 32 < BK/GN(5) DIODE BU(7) HOUR METER BK/RD(1) < < BR BK/GN(10)
D 127-0925 4 BK
122-2375 140-6617 87
RD-12 OR(3) < 33 < L86
L40
RD(6) BR(1) TEMP 2 BU(4) 120-5966 GN/BR(2) < < BU D
2 MOTOR 30 L86 123-3998
RD(27) BR/BK(1) BR-12 <2 < BK-12 < 34 < BK/GN(3) BR(1) RD(9)
L86 LOWER WINDSHIELD
L6

87b 3

BK/GN/RD(9)
<1 < BR-12 V GN(4) < 02 < RD(7) F F GN/BR(2) A AIR HORN RD(1) + - A
5W-5883 BU(2) H 137-7245

BK/GN/RD(1)
RD(30) V BU/YL(4) < 13 < BU/YL(4) L85 BU(15) RD(28) BK/GN(14)
L87 5
BK-12 YL (15) V D
L16
BR/WH(1) < 24 < RD(9) L44 GN(7) RD(29) GN/BR(6) RD(7) RD(17) PU(4) BK BK-14 BK-14 COMPRESSED
AUX HYD

BK/GN/RD(8)
BACKUP RESISTOR AIR HORN

BU/YL(5)
PU (8) BU(5) < 25 < BU(7) PU(12) PU(12) RD(16) BU(5) BK
MAIN PUMP PRV (CCW ROTATION) 5W-9400

RD/YL(8)
YL(10)

WH(2)
GN(4) < 1 < GN(4) GN(5) < 26 < GN(5) BK

GN(2)
GN(3)
BACKUP RESISTOR

RD(1)
BU(4)

BU(2)
BK(6)
143-8251 SWITCH

GN(10)
L52
SWING PUMP PRV

RD/YL(15)
RD/YL(14)
A/C PRESS A/C CLUTCH <2 < BR/BK(2) < 14 < BU(5) 122-1903 RD(7)
SWITCH RELAY 143-8251

BU/YL(4)
PU (9) < 22 < F A 86 BK RD(13) BK

RD(18)
RD(16)
133-1331 V 85 86 123-6527 L50 L50 85
YL(13) GN(1) < 36 < BK > > RD

GN(5)
RD(7)

RD(9)
BU(7)
87 L4 L13 87 BRAKE/ D
1

< <
< <
GN <1 < OR(8) RD(31) YL(15) BR/WH(2) < 37 < RD(19) OR(12) DIODE GN(13) TRAVEL GN/BR(2) > >

L49
30 L44 L52 30 2 B
BRAKE
RD(26) RD(27) <2 < YL(16) V YL(16) GN(2) < 35 < OR(3) BU/YL(4) WH(8) 86 85 CUTOFF B BK

L77
87b L46 L46 120-5969 3 117-4861
WH(4) BU < 31 < PU(3) 87a START/STOP A 87

L50
L15 L48 117-4861 5
WH(14)

L78
GY(6) GN(4) < 39 < WH(1) RD(14)

L44
G L49 30

BK/GN/RD(2) L48
L40
L45

L47
L41
BK BU/YL(4) RD(7) < 29 < BK(4) A
D L16 L52
GY(9) HEAVY LIFT RD(24) A/C CLUTCH BR/WH(1) BK(1) < 28 < BK(5)
L50
87a STARTING/

BK/GN/RD(3)
L78

BK/YL/WH(2)

BK/GN/RD(1)
L SOLENOID BK (15) SOLENOID BU(5) RD/YL(11) < 20 < BK(2) BK PILOT PRESS

BK/GN(10)
8U-6424 3E-1906 ENABLE SWITCH
WH(15)

BR/WH(1)

BR/WH(2)

BR/WH(3)

BU/WH(1)
GN/WH(1)
BK/WH(1)

BK/WH(3)

BK/WH(5)
GN/BU(5)

GN/BR(2)
BK/GN(6)

BK/GN(7)

BK/GN(3)
GN(5) GN/BR(3) < 19 < BK(3) GN(13)

GY/BK(1)

GY/BK(1)
GN/BR(1)
BR/BK(1)

BR/BK(2)

BK/PU(1)

BK/PU(1)
BK/GN(1)

BK/GN(2)
RD/YL(9)
RD/YL(8)

BK/RD(1)
RD/YL(5)
RD/YL(6)
RD/YL(7)
RD/YL(1)

RD/YL(3)

RD/YL(2)

BK/YL(1)
BU/YL(2)

BU/YL(5)
D L44 117-3187
BK BR/BK(2) GN/BR(4) < 10 < YL(1) BK/YL/WH(1) BK(1) < 1 < WH

BK(12)
WH(1)

WH(5)
WH(6)

WH(3)
L12

YL(10)

BK-14
WH(2)
GN(1)
GN(2)

OR(3)

OR(1)

RD(4)
PU(3)

BU(1)

PU(2)

GN(3)
L46

BK(1)
BK(2)
BK(3)
BK(4)

BK(5)

BK(8)
L45

RD(5)

RD(3)

GY(1)

GY(2)

GN(8)
RD(2)

RD(1)

GY(7)
BU(4)

BU(2)
BK(7)
L46

BK(6)

PU(7)
YL(2)
YL(1)

YL(2)
GN-14 <1 < GN(4) ENGINE GN/BU(4) < 09 < BK(1)
L48
BK < 2 < BK
START/STOP L48 AIR SUSPENDED
GN-14 <2 < BK L1 GN/WH(4) < 18 < BR/WH(2)
SOLENOID CONN 3 L49 DRIVER SEAT D M
LAMP PU(9) 8C-3663 GY(4) < 17 < BR/BK(1) A H FLOOD
LICENCE PLATE CONN 5 LAMP AS.

< 09 <
< 10 <
< 03 <
< 02 <
< 11 <
< 07 <
< 12 <
< 01 <
< 08 <
< 06 <
< 04 <
< 05 <
CONN 7

<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
SHIELD WH(4) < 16 < BR/WH(1)
116-9623 L11 120-6775

< 11
< 05
< 06
< 07
< 08
< 10
< 09
< 14
< 12
< 16
< 18
< 15
< 17
< 56
< 13
< 01
< 20
< 49
< 69
< 70
< 48
< 57
< 65
< 66
< 67
< 68
< 21
< 46
< 47
< 53
< 54
< 30
< 60
< 43
< 44
< 52
< 02
< 39
< 23
< 40
< 41
< 42
< 33
< 58
< 36
< 31
< 38
< 55
< 34
< 50
< 37
< 35
< 25
< 27
< 29
< 04
< 26
< 24
< 22
< 62
< 59
< 45
< 03
< 51
< 64
< 63
< 61
< 28
< 32
< 19
BR GN-8 RD/YL(12) < 15 < BR/BK(2) B

BK
L76 L64
L WH BK-8 BU/YL(3) < 12 < GN(2)
B B
GY(10) BK L83 YL(1) D < 11 <
A
GN(1) B GN(10) L63
BK G PU(8) 12V PU(7)
CONVERTER TO FRAME

BU/WH(1)

BK/GN(10)
BK/WH(5)
BK/GN/RD(1)
BK/GN/RD(2)
BR/WH(3)

BK/WH(3)

GN/BR(2)

GY/BK(1)
GN/WH(1)
24V OR(1) PU(7) STICK TRAVEL BK

BR/WH(1)

BK/PU(1)
BK/GN/RD(3)
GN/BU(5)

GY/BK(1)

BK/RD(1)
BK WH ENGINE

BR/WH(2)
<1 <

BK/GN(2)
BK/GN(3)

BK/GN(7)

BK/PU(1)
24V-12V

RD/YL(8)
BK/YL/WH(2)
BK/WH(1)

BK/GN(1)

L70 BK/YL(1)
BR/BK(2)

GN/BR(1)
RD/YL(3)

RD/YL(5)

RD/YL(7)

BK/GN(6)

BR/BK(1)
BU/YL(2)

RD/YL(2)
RD/YL(9)

BK(12)
GN(8)
RD/YL(1)

RD/YL(6)

GY(7)
BU/YL(5)

YL(2)
BK <2 < BR OIL SW D < 12 < F 120-6566 GND BK BK-14 LAMP AS.

WH(3)
G

WH(1)

WH(5)
WH(6)

WH(2)

RD(4)
OR(3)

GN(3)

OR(1)

GN(2)
YL(10)
GN(1)

BU(2)

BU(4)
BU(1)
GY(1)

RD(2)
RD(3)

GY(2)

RD(5)

RD(1)

BK(8)
8U-4742

PU(2)

PU(3)
BK(2)

BK(3)
BK(4)
BK(5)

BK(1)

BK(6)

BK(7)

YL(2)
3E-6455

YL(1)
BK SHIELD L84 BU(15) < 11 < PU(12) BK TO FRAME

L64

L63

L62
ENGINE SPEED L85

L61
GY(6) SENSOR BK-18 < 1 < BK GN(7) < 09 < BU(15)
L14
WH (4) 6V-2455 RD-18 < 2 < PU(12) < 10 < GN(7)
CONN 2 YL(9) L63

L68
RD(26) RD-4(1) BU-18 < 3 < BR/WH(1) WH(7) < 01 < RD(10) PLUG

L61
L70 L68

L54
120-5967

L54
BK/WH(1) L60
RD(10) < 02 < BU(8) YL(5) BK/YL/WH(2)

L64
GY(1)

L61
L56

L57

L59

L60

L62

L63
L80
(2)

L58

L54
L53
< 03 < GY(8) > + > WH-14
BR/BK

RD-4(4) BU(8) WH(7) BU(9)

GY

L60
L46

BK/GN/RD(3)
BK < - < BK-14

RD/YL(6)

RD/YL(1)
COOLANT TEMP COOLANT TEMP GN(6) < 04 < OR(11) RD(5)

GY(2)
BU/YL(2)

BK(1)

BK(6)

L62
D 6

BK/GN(3)
BK/GN(2)

GN/BU(5)
BK/GN(6)
G S
RD/YL(30) 2

PU(2)
RD-6(2)

SWITCH SENDER

BK/GN/RD(2)
RD(11) < 05 < D
119-3399 8U-1516
BU(10) < 06 < RD(11)
BU(5)

3
RD-4(1)

FUSE MTRBAT RD-00 GN(5) < 07 < GN(6) OR(11) POWER B

GN/WH(1)
BR/WH(1)

BR/WH(2)
L80 L80

GN/BR(1)

BK/GN(1)

BR/BK(1)
N 8

RD/YL(2)

RD/YL(9)
BU/YL(5)
ALTERNATOR D GN-8 ALTERNATOR T D T D < 08 < BU(10) CONN 6 MODE SW HEAD
BK

123-8838 L76 139-8289 6

YL(10)
LAMP SW

WH(3)

WH(2)
+ 9W-3043

GN(3)

OR(3)
RD(1)

RD(4)
< 08 <

BU(1)

PU(3)
STARTER YL(5) YL(5) YL(5)

BU(2)

BU(4)
BK(7)

BK(8)

YL(9)
MOTOR 2 B 5w-5867
70A RD-6(2) 8C-4774 D+ W WH(15) BU(9) BU(9) < 07 < BU(9) 10 9

L70
W G 3 7
D D- COOLANT TEMP < 07 < OR(11) PU(6) < 02 < GN(7) BK GY
SWITCH L83 5
BK-00 YL(11) < 12 < SHIELD E WH(12) < 06 < WH(12) BK GY
C U
127-5347 L8 1 C

BU/WH(1)
D GN < 10 < WH OR(4) < 01 < BU(15) KEY SWITCH B E FORWARD

BK/YL(1)
L59
CC L65 117-9507 HORN
BK-4 T WH < 11 < GN YL(17) < 05 < BK/WH(5)
BK-00

9 6

10
L84 6C-5859
RD/YL(17) 2
BK-8

BK < 2< BK SHIELD < 06 < BR BU(15) < 03 < L80 GY L69 L69
15
RD-6(3)

BR/BK(5) < 1< BK GN(9) < 01 < YL(11) GN(7) < 04 < BR/WH(3) RD(2) BK AUX HYD RD/YL(11)
(CW ROTATION) 3 BK(1) GN/BR(3)
BK TO ENGINE YL(12) < 02 < YL(12) BR/BK(2) GY SWITCH L81
U D CONN 1
RD-4(4) L10 BR < 05 < PU(8) L66 G E GY L59 RD/YL(30) 122-1903 FRONT L35 GN/BR(4)
BK RD(21) < 08 < RD(21) SHIELD RD(3) 30 CREEPER SPEED FLOOD D
START L13 B
B SWITCH LAMP SW

BK/GN(11)
D

RD/YL(18)
RELAY OR(11) < 09 < BK WH RD(2)

GN/WH(1)
10 9

BR/WH(1)

BK/WH(4)
L55

GN/BR(5)
BK/GN(9)
L1 L65 5W-9347 B 5W-5867

BU/YL(5)
3E-0075 D TO FRAME PU(8) < 04 < GN(9) GN
L4 GY

YL(10)

YL(12)
YL(11)
1 5

WH(2)
GN(3)
RD(1)
BU(2)

BU(4)
BK <1 < BK BK < 03 < BU(10) BR 50A RD/YL(31) PU(2) BK GY

BU
BB3
BK <2 < GN(2) G EE 123-6472 TO FRAME YL(11) GN(10) > >

BK

BK
CONTROL-ENG/PUMP L81
RD(22) <A < WH 2 24V 127-9854 YL(12) 9 B > > YL(11)

10
1 5

ENG COOL HIGH TEMP

1
2
3
4
5
6
7

HYD OIL HIGH TEMP 1

2
3
4
5
6
7

1
2
3
4
5
6
7
K G BK(13) <B < BR 3 GND
L9
BR(2) 40 TXD RD/YL(6) BU/WH(1) YL(12)
L56

BK-10 BR(2) <C < GN 7 TXD WH(10) 42 RXD PU(6) BK PU(1) BK/GN(3) REAR FLOOD BK

HYD OIL LOW TEMP

ENGINE OIL PRESS

POWER MODE III +

BK

L9

POWER MODE III -

L67

WH(10) <D < YL 6 RXD BK(13) 12 GND (BB3) OR(4) YL(9) B LAMP SW BU/YL(5)
9 5W-9347

10

PARKING BRAKE
TRANS SPEED II
POWER MODE II
BK/GN/RD(5)
D

TRANS SPEED I
POWER MODE I
BK BK <E < SHIELD YL(11) 07 MODE III LAMP - YL(17) RD/YL(7) SWING BRAKE YL(10)
56B HEAD

NC (+ 24 VOLT)
L55

TURN SIGNAL
TURN SIGNAL
L58
B SWITCH

ALTERNATOR
TO CAB SHIELD 16 GOVERNOR CONTR-SHIELD BU(15) BK(2) BK GY L79 GN/WH(1) GN/BU(4) LAMP AS.

L53
L57 5 7 8U-6353 56A

HIGH BEAM
ETHER START RD(11) 19 MODE TEMP. WH(12) RD/YL(5) BK/GN(11) B WH(2) GN/WH(4) 2U-4800
K L79 58

+ 24 VOLT
AIR FILTER SOLINOID BK-10 BR 22 GOVERNOR CONTR-KL.3 GN(7) START AID SW BK(3) BK/WH(1) BU(4) GY(4)

WH(1)
GOV ACTR 112-7593 CONTROL-ENGINE 1 POSITION

YL(1)
CLOG SW 122-2377 8U-6357
LAMP
5W-9934 D G G
139-5688 BU(8) 32 MAGNET TRAVEL SPEED + BK(5) BK/WH(4)
5 7 GN/BU(5) 3 7
GN(3) 31 5W-2033

WH(5)
WH(6)

GND

GND
SOLENOID (DRE2K) 01 > WH(13) 16 SOLENOID (DRE2K) YL(12) 33 MODE III LAMP + BACKUP SW PU(8) BK(4) LOWER 9 TRANS SPEED BK BR/WH(1) L35 BK

10
L66

NC
NC
BK <1 < BR/BK(5) SOLENOID (DRE2K) 02 > PU(10) 17 SOLENOID (DRE2K) GN(9) 35 SW-TRAVEL SPEED CONTR 8U-6353 RD(21) WIPER SW BK SWITCH 1 BK/GN(6) 1 BK(6) BU(2) BK
L8 3 7 5W-9744 5W-9372
BK <2 < GN(1) 01 POS INDICATOR OUT GN(6) 37 BRAKE LIGHT HEAVY RD/YL(3) LEFT REAR LEFT FRONT OVERLOAD WARNING 8 RD(1) C B A
8

BK/GN/RD(6)
D L13 LIFT SW 1 GN(1) STABILIZER STABILIZER DEVICE SWITCH 6 4
BR/WH(2) POS IND OUT 01 RD 01 YL 13 POS INDICATOR IN BU(9) 38 MODE II 7 GY L79 BK/GN(11) E GY(8)
5 5W-9347 LOCKOUT SW LOCKOUT SW 5W-9347 2 2 D
BK/WH(4) < A <RD 1 3

BRAKE LOW PRESS

BR/WH(2) GN(2) POS IND IN 02 BR 02 BR 19 POS INDICATOR GND YL(5) 39 MODE I BK/WH(3)

OR(2)
1 E 4 8 5W-9347 5W-9347 7 TRAVEL ALARM
BK/GN(7) 5 B

SUPPL STEERING
SUPPL STEERING
RD(22)

POS IND GND 03 BK 03 WH 20 NC WH 44 GOVERNOR CONTR-KL.1 GN(8) CANCEL SW GN/BR(5) < B< 2
1 5 RD(21) 2 1 5 1 5 1 5 2 < C<
04 SHIELD 03 NC GN 45 GOVERNOR CONTR-KL.2 BK B RD/YL(29) RD/YL(5) BK(2) YL(1) YL(9) 10 9 10 9 8U-6357 RD/YL(18)

HYD OIL TEMP

6 8 4 BR D
SHIELD 07 NC OR(11) 49 MODE III B BK/GN(9) BK BK

FUEL LEVEL
G

COOL TEMP

HYD FILTER
2 B B

OVERLOAD
B

AIR FILTER
10 NC RD(21) 51 SWITCH HLC E 9 10 9 9 9 9 9 BK BK/GN(12) BK GY HAZARD SW B BK MONITOR BK
10

10

10

10

10

+ 24 VOLT
BK-10 11 NC RD(10) 02 + 24 VOLT E GY(1) GY BK BK 5W-9351 GN/BR(5) PANEL WH(4)
143-6855 ENGINE
OR(6) 04 NOMINAL VALUE 1 RD(22) 01 + 24 VOLT 10 9 BK GY GY BK BK OR(2) < 6 < GN/BR(1) SPEED DIAL
7
3 RD/YL(1) 1 5 141-6258
RD(23)

OR(5) 12 PWM INPUT -- NC B B BK GY WH(6) BK/YL(1) < 8 < RD/YL(2) TURN SIGNAL

NC
G OR(5) -- NC BK WH(5) 1 BK BEACON SW < 2 < BK(7) LAMP AS.
22 SIGNAL GROUND
B 5W-9347 116-9626
BK-10 SHIELD 14 NC -- NC GY BK BK/GN/RD(7) < 3 < WH(3)

7
6
5
4
BR/WH(3) 3
BR/BK(2) 2
OR(3) 1

7
6
RD/YL(9) 5
BR/WH(2) 4
BR/BK(1) 3
2
1
9

10
L67 4 8
23 NC L7 WH 10 NOMINAL VALUE GND 2 UPPER GN(9) < 5 < BK/GN(9)
HEATER FAN SW 2

SHIELD
21 SIGNAL GROUND GN 34 NOMINAL VALUE 2 WIPER SW BU(10) BK/GN(2) BK GY BK/GN(1)
111-3805 5W-9744 7

RD(4)
5

PU(3)
BU(1)
YL(9)
L7 WH 06 NOMINAL VALUE GND 2 BR 46 ACTUAL VALUE OUTPUT AEC SW B RIGHT REAR RIGHT FRONT HAMMER E TRAVEL LOCK
BK

WH
1

GN
BR
WH (4) GN 05 NOMINAL VALUE 2 SHIELD -- NC A/C SW 5W-9372 STABILIZER STABILIZER SWITCH SWITCH B GY < 1 < BK(8)
L6 LOCKOUT SW LOCKOUT SW 8U-7284 10 9 8U-6357
5W-9347 E YL(7) A3
L1
L4

GY(6) BR 24 ACTUAL VALUE OUTPUT BK(14) 08 MAGNET TRAVEL SPEED - YL(13) 5W-9347 5W-9347 8 < 7 < GY
L10
L11

L14 B3 7 6 5 7
BK(12) 5
L12

BK 09 + ELECTRONIC BU(13) 36 SW-TRAVEL PEDAL BK 5 7 PU(8) BU(11) BK BK/GN/RD(3) GY

BK/GN(10)
L3 2 L69
RD(26) RD(23) 15 OUTPUT STAGE BK 03 GROUND YL(7) 1 5 YL(13) BK 1 RD(20) B4 RD/YL(28) 1 5 BK(5) RD/YL(27) 1 5 BK(3) RD/YL(7) 1 5 WH(1) 2
1 GY BK L55
B5 4 PARKING 10
04 GROUND

BK(12)
RD(27) 18 SWITCHING INPUT BK YL(8) BK(10) B PILOT CONTROL BK

GN(8)
BRAKE SW

GY(7)
B
02 GND (L0) PU(9) 50 SW-PRESS AEC B BK BK C1 B B B
10 9 8U-6353 LOCK SW BK
SHIELD

9 9 9 9 9 9 9
10

10

10

10

10

10

10
L 5W-9372
WH(12)

B1
RD(27)
RD(24)
BK(15)

BK(16)
BK(17)

BK 08 RD(24) 30 SOLENOID HLC + GY GY

YL(17)

GND (L0)
B B
PU(9)

STOP LAMP RD(26) BK(15) 09 SOLENOID HLC - BK BK B GY GY BK BK GY BK BK BK TO FRAME YL(11)

WH
BR

9X-4493 L7 L81 L81

BK WH 53 ENGINE SPEED SENSOR TO FRAME RD/YL(26) BK GY L55 YL(12)

L68
BK BR 18 ENGINE SPEED SENSOR L67 GY L67 L68 L68
L5 SHIELD 17 ENGINE SPEED SENSOR
L5

BK WH(12) 29 SOL SWING CONTROL +

TAIL LAMP BK BK(16) 06 SOL SWING CONTROL -
5W-2040 GY(6) YL(17) 28 SOLENOID VALVE-LS + RD(7)
TO FRAME BK(17) 05 SOLENOID VALVE-LS - D BK(1)
BASIC LAMP GP L3 BU(11) < 04 < WH RD/YL(11)
116-9625 G RD(20) < 03 < RD HEATER FAN RD/YL(12) <1 < BR +V REVERSE STEER GN/BR(3)
122-2372 L2 PROX. SW L1
K A/C TEMP BK(10) < 02 < BK RESISTOR BU/YL(3) <2 < BK SIGNAL GN/BR(4)
122-2373 MOTOR 121-0797
BK-10 REGULATOR BK < 01 < BR BK <3 < BU GROUND GN/BU(4)
TURN LAMP GP
116-9624 L V 122-2374 YL(13) GN/WH(4)
T° B GY(4)
YL(15) < 1<
TURN LAMP BK L4
5W-2040 YL(16) < 2<
WH(4) YL(13) HARNESS AS WH(4)
L4 V DIODE ID PART-NO. LOC
<< OVERLOAD WARNING TO FRAME RD/YL(12)
142-9472 DEVICE SWITCH L2
A 139-8281 C-6 BK BU/YL(3)
118-5501
YL(1) YL(1)
L1 L1 L1 B 135-4593 C-6 D
C 135-4595 E-7
D 133-2102 C-7
E 139-8282 C-7
FUSE "A" BLACK FUSE "B" YELLOW F 139-8283 C-7
WIRES THAT HAVE BATTERY VOLTAGE
1 PARKING LIGHTS RHS 7,5 1 ELECTRICAL FUEL LIFT PUMP 25 G 135-4590 B-7 WHEN THE KEY SWITCH IS OFF.
2 PARKING LIGHTS LHS 7,5 2 WARNING LIGHT; START/STOP SOLENOID 7,5 H 139-0549 C-1 WIRES THAT HAVE BATTERY VOLTAGE
3 INSTRUMENT LIGHTING 7,5 3 STARTER KEY SWITCH; MAIN POWER-RELAY; LIGHT 15 J WHEN THE KEY SWITCH IS ON.

4 LOW BEAM RHS 7,5 4 POTENTIAL TRANSFORMER 24V ==> 12V (RADIO) 7,5 K 139-8284 C-8 STARTING CIRCUIT. SYMBOL DESCRIPTION
5 LOW BEAM LHS 7,5 5 START/STOP RELAY 7,5 L 140-1059 F-9 MONITOR CIRCUIT. (EMS) BLADE, SPADE, RING,
6 HIGH BEAM RHS 7,5 6 COMPRESSOR AIR HORN 15 M 120-6919 D-1 OR SCREW TERMINAL
PANEL LAMP CIRCUIT.
THIS SCHEMATIC IS FOR THE M320 EXCAVATOR
7 HIGH BEAM LHS 7,5 7 FAN; ETHER START 1 5 N 121-0875 F-8 CIRCUIT CONNECTED
WASHER/WIPER CIRCUIT. (137-1409) (CH 01)
8 CONTROL LIGHTS; TURN SIGNAL 7,5 8 CIGARETTE LIGHTER; PLUG; DOME LIGHT 7,5 P 121-0876 E-8
HEATER AND AIR CONDITIONER CIRCUIT. COMPONENTS ARE SHOWN INSTALLED ON A FULLY
R 121-0877 F-8 CIRCUIT NOT CONNECTED
GROUND CIRCUIT. OPERABLE MACHINE WITH THE KEY AND ENGINE OFF.
T 121-0879 F-8
ELECTRICAL CONNECTION
A ABBREV COLOR U 122-2360 C-9 ENGINE AND PUMP CONTROL CIRCUIT. TO MACHINE STRUCTURE
UNLESS OTHERWISE SPECIFIED: ALL WIRE IS 16 GAUGE A
FUSE "C" GREEN FUSE "D" RED BK BLACK V 143-5031 D-8
TURN SIGNAL CIRCUIT. INTERNAL ELECTRICAL
NOTE A: SWITCH SHOWN WITH NO HYDRAULIC DEMAND
1 BACKUP 7,5 1 STOP LIGHT 7,5 AWG MM*2 BR BROWN W 132-7212 F-8 CONNECTION TO SURFACE
COMPONENTS ARE SHOWN INSTALLED ON A FULLY 2 POWER MODE SELECTION 7,5 2 AIR CONDITION 20 00 70 BU BLUE X 122-2364 F-8
WIRES THAT HAVE BATTERY VOLTAGE
WHEN THE KEYSWITCH IS ON AND THE OF COMPONENT NOTE: ALL CONSOLE SWITCHS ARE SHOWN WITH THE FRONT
OPERABLE MACHINE WITH THE KEY AND ENGINE OFF. LEFT HAND HYDRAULIC CONSOLE IS CONNECTOR OF THE SWITCH DEPRESSED, AS SEEN FRON THE OPERATORS SEAT.
3 INDIVIDUAL STABILIZERS 7,5 3 HORN; BUZZER (OVERLOAD); 1/3 PRESSURE DROP 7,5 0 50 GN GREEN Y 138-4515 F-6 LATCHED IN THE DOWN POSITION.
4 WORKING LIGHTS 1 5 4 BLUE LIGHT (REVERSE STEERING); TRAVEL ALARM 7,5 4 16 GY GRAY Z 138-4514 F-1 START AID CIRCUIT. ATCH WIRE, CABLE,
5 HAMMER BLOW FREQUENCY ADJUST.; FLOW CONTROL 7,5 5 ARM REST SWITCH; SWING GEAR; MISCELLANEOUS- 15 6 10 OR ORANGE AA 122-2365 F-1 COMPONENT
6 ELECTRONICS 7,5 FUNCTION; RELAY TRAVEL CUT OFF; PARK BRAKE; 8 6 PK PINK BB 122-2366 F-6 ALL DASHED LINES ARE ATTACHMENTS.
L# CIRCUIT GROUPING
UNLESS OTHERWISE SPECIFIED: 7 ROTATING BEACON 15 TRANSMISSION SPEED; CREEPER SPEED; CAB-RISER 10 4 PU PURPLE CC 122-2382 C-9 DESIGNATION
ALL WIRE IS 16 GAGE
8 AIR SUSPENDED DRIVER SEAT; PRIORITY 7,5 6 SUPPLEMENTAL STEERING 7,5 12 2.5 RD RED DD 8X-9618 F-1
7 WINDSHIELD WIPER UPPER AND PUMP 7,5 14 1.5 WH WHITE EE 123-6475 C-7
8 WINDSHIELD WIPER LOWER AND PUMP 7,5 16 1 YL YELLOW FF 126-6801 F-8

D96201

9 8 7 6 5 4 3 2 1