33 - 1
Introduction
This section explains how the Powershift 6 speed
(ShiftMaster) electrical system works .
Central to the system is the ShiftMaster ECU (Electronic
Control Unit)
1
. The unit receives ‘inputs’ from electrical
devices such as the gear select switch
B
. Depending on the
input signals the ECU ‘outputs’ energise electrical devices
such as gearbox solenoid control valves
2
.
Component Identification
The ECU can be connected to diagnostics software loaded
on a laptop PC. The commincations link is facilitated via
diagnostics socket
3
. See
Powershift Gearbox - 6 Speed,
ShiftMaster Diagnostics - User Guide
.
Note:
The ECU also controls 2/4WD selection by activating
relay
S
. 2/4WD electrical system is not described in this
section.
Section F
9803/3280
Section F
33 - 1
Issue 2*
Electrical Connections
Powershift Gearbox - 6 Speed
ECU input devices
B
Gear select switch
C
Forward/Neutral/Reverse select switch
D
Transmission dump switch
E
Gearbox oil temperature switch
F
Park brake switch
G
Transmission dump relay
H
Speed sensor - gearbox mounted
J
Kick down switch
K
Throttle switch
L
Gearbox oil pressure switch
ECU output - activated devices
N
In-cab warning light - high gearbox oil temperature
P
In-cab warning light - low gearbox oil pressure
R
In-cab master warning light and buzzer
S-Z
Gearbox solenoid control valves
Note:
For identification of in-cab warning lights see the
machine Operator Handbook.
F
N
R
1
2
3
A
A405360
H
A
B
E
J
D
F
G
C
Z
X
Y
S
T
U
W
V
GB
GC
C
B
F
D
3
2
L
H
E
K
J
G
1