OPERATOR'S MANUAL MAINTENANCE

Section C - Electrics
Basic System Operation
Slew Brake Solenoid Valve Failure
C-66 C-66
9803/9880-3
Slew Brake Solenoid Valve Failure
Operation
In the event of slew brake solenoid or the slew pressure
switch failing, the slew brake will still operate. The pilot
signal from the hand controller passes through the shuttle
block and enters the slew brake valve via port A. When the
pressure overcomes the slew brake shuttle, the signal
passes through the slew brake valve via port B and is
directed to the slew brake. When sufficient pressure is
raised the slew brake is lifted.
The slew operation will tend to be notchy, as the brake on
and off timing will depend upon the position of the slew
joystick.
Note: This operation is only to be used to make the
machine safe i.e. to slew the machine into a safe position,
for transportation to a place where an appropriate repair
can be carried out.