Model 4700 Maintenance Manual
Section 8. Theory of Operation
All Dual Traction Motor Trucks and Single Traction Motor Trucks <S/N 10677 Item
Connection
Function Description
Theory of Operation
Normal Level
Pinout Matrix Signal Source
Signal User
13
JCM-1
LOW
Voltage from the HCB to turn on the Lowering Solenoid (EVP1). If not present, check the HCB, wiring, and connections.
Approx. 2-12V wrt B+ (approx. 18 ohms across coil)
HCB
EVP1
14
JCM-2
+V
Voltage from the HCB to the Lowering (EVP1) and Lifting (EV2) Solenoids. If not present, check the HCB, wiring, and connections. Note: This voltage is common to both solenoids. If this voltage is lost, neither solenoid will work.
B+
HCB
EV2, EVP1
15
JCM-3
LIFT
Voltage from the HCB to turn on the Lifting Solenoid (EV2). If not present, check the HCB, wiring, and connections.
Lifting: Approx. 24V wrt B+ (approx. 27 ohms across coil)
HCB
EV2
16
JCM-4
TILT FW
Voltage from the HCB to turn on the Tilt Forward Solenoid (EV3). If not present, check the HCB, wiring, and connections.
Approx. 15V wrt B+ (approx. 18 ohms across coil)
HCB
EV3
17
JCM-5
+V
Voltage from the HCB to the Tilt Forward (EV3) and Tilt Backward (EV4) Solenoids. If not present, check the HCB, wiring, and connections. Note: This voltage is common to both solenoids. If this voltage is lost, neither solenoid will work.
B+
HCB
EV3, EV4
18
JCM-6
TILT BW
Voltage from the HCB to turn on the Tilt Backward Solenoid (EV4). If not present, check the HCB, wiring, and connections.
Approx. 15V wrt B+ (approx. 18 ohms across coil)
HCB
EV4
19
JCM-7
L SIDESHIFT
Voltage from the HCB to turn on the Left Sideshift Solenoid (EV5). If not present, check the HCB, wiring, and connections.
Approx. 18V wrt B+ (approx. 22 ohms across coil)
HCB
EV5
20
JCM-8
+V
Voltage from the HCB to the Left (EV5) and Right (EV6) Sideshift Solenoids. If not present, check the HCB, wiring, and connections. Note: This voltage is common to both solenoids. If this voltage is lost, neither solenoid will work.
B+
HCB
EV5, EV6
21
JCM-9 thru 11
NOT USED
22
JCM-12
4th FUNCTION
Voltage from the HCB to turn on the 4th Function Solenoid (EV7). If not present, check the HCB, wiring, and connections.
Approx. 18V wrt B+ (approx. 22 ohms across coil)
HCB
EV7
Publication 1160093, Issued: 20 May 2013
8-15
