OPERATOR'S MANUAL MAINTENANCE

Section C - Electrics
Basic System Operation
Slew lock (100% Slew Brake)
C-64 C-64
9803/9880-3
Slew lock (100% Slew Brake)
Operation
C028430GB-2
Fig 63.
The slew lock prevents any slew operation of the machine,
even if the LH joystick is moved. It acts as 100% slew
parking brake and disables the slew pilot circuit, by
applying equal pressure on either side of the slew spool in
the main valve block (slew shut off).
The lock is operated by pressing the slew lock switch on
the fascia switch panel. When pressed the status indicator
illuminates. The EMS displays the message "SWING
LOCK", and the warning light illuminates. The EMS
transmits the slew lock request to the ECU1 via the CAN
communications link. The slew shut off solenoid is
energised (effectively isolating the joysticks) and slew
parking brake solenoids is left de-energised by the ECU1.
5 seconds after the Slew Lock button is pressed the slew
lock solenoid is energised, opening the slew brake cylinder
to tank and applying 100% braking force.
The slew lock is de-activated by a second press of the
fascia switch. This causes the switch status indicator and
the EMS warning lamp to be extinguished. The ECU1 de-
energises the slew lock and slew shut off solenoid valves.
The slew parking brake will not be re-energised until an
input from the slew pilot pressure switch is seen.
By Default upon start slew lock is automatically
disengaged.
Swing Lock Swing Pilot Psw Swing Lock Sol Valve Swing Parking Brake
Sol Valve
Swing shut off Sol
Valve
FS2 i/p29(A-36) o/p8 (C-3) o/p9 (C-4) o/p10 (C-16)
89 8 9 8
9

88
(=100% brake)
9
9
+ 5 Sec

98
(=100% brake)
9