jcb JS70 Service Manual

4 - 9
Swing Brake/Swing Lock (continued)
Swing Lock (100% brake)
After a further five seconds of no swing operation with
the swing lock switch selected on the left switch panel,
a 24V signal is sent from CN13 terminal (swing lock
output), which immediately switches the swing lock
solenoid valve (SOL 4).
This allows the oil in the motor brake piston to drain to
tank and therefore locking the swing brake 100%.
a. Even though the slew brake switch on the left switch
panel is ON, and the swing lever is being operated the
slew lock solenoid (SOL 4) is not engaged.
b. When five seconds have elapsed after the swing lever
being in neutral, a 24V signal is sent to both the swing
brake and the swing lock solenoids from CN13 terminals
9 and 11 respectively.
The signal light on the monitor is illuminated and 100%
brake is applied.
c. When attempting to operate the swing lever when the
swing lock switch is engaged, the swing brake solenoid
output is OFF, the 24v output to the swing lock solenoid
and locks it with 100% brake.
The swing brake is reset by pressing the button.
Section C Electrics
9803/6020
Section C
4 - 9
Issue 1
Engine Control
288390
A
H
J
K
L
M
N
P
D
G
C
B
F
E
Swing lever
OFF
OFF
ON
ON
OFF
ON
OFF
ON
ON
ON
OFF
OFF
5 seconds after
lever in neutral
ON
ON
OFF
OFF
5 seconds after
lever in neutral
ON
OFF
OFF
OFF
5 seconds after
lever in neutral
ON
ON
Swing lock
Switch
OFF
5 seconds after
lever in neutral
ON
SOL4
Swing lock
solenoid
(100%)
OFF
ON
SOL2
Swing brake
solenoid
(50%)
ON
ON
Monitor
OFF
ON
a.
b.
c.
P
H
Right Switch Panel
J
Swing Lock Switch
K
Swing Lock Input
L
Swing Pressure Switch Input
M
Swing Brake Output
/Swing Lock Output
N
Swing Lock Monitor
A
Left Switch Panel
B
Control Valve (Swing)
C
Remote Control Switch
D
Swing Pressure Switch
E
Swing Lock
F
Swing Brake

jcb JS70 Specifications

General

Brand	jcb
Model	JS70
Category	Excavators
Language	English