OPERATOR'S MANUAL MAINTENANCE

Section C - Electrics
Basic System Operation
Slew Brake (100%)
C-60 C-60
9803/9880-3
Slew Brake (100%)
Operation
C028410GB-2
Fig 61.
The slew parking brake holds the current slew position of
the machine and prevents slew drift.
This is the default operation with the engine running.
The operator signals for slew movement by moving the left
hand joystick. This results in the slew pilot pressure switch
being activated. This signals the ECU1 to energise the
slew parking brake solenoid valve, thus enabling slew.
The slew pilot pressure switch is de-activated, by returning
the joysticks to neutral, and the upper structure comes to a
stop using a hydrostatic brake (cross lines relief valve). If
this condition exists for 5 seconds then the slew parking
brake solenoid is de-energised. Thus applying the slew
brake.
To prevent any damage to the slew brake occurring when
excavating the slew brake solenoid will remain energised
and the slew brake remain off, if the upper pilot pressure
switch is activated or re-activated within 5 seconds of the
slew pressure switch closing.
If however the upper pilot pressure switch remains de-
activated for 5 seconds or longer, the slew brake solenoid
will de-energise (brake on). The slew brake solenoid will
remain de-energised until the slew pilot pressure switch is
activated.
When L mode (lifting) is selected, the upper pilot pressure
switch is ignored and 100% brake applied. When the slew
pilot switch is energised the slew parking brake is lifted.
By Default Slew parking brake is automatically applied at
start up.