OPERATOR'S MANUAL MAINTENANCE

Section E - Hydraulics
Circuit Descriptions
100% Slew Lock
E-52 E-52
9803/9880-3
100% Slew Lock
For schematic,
K Fig 19. ( T E-53).
When the slew lock button is operated in the cab, the
ECU1 give two outputs:
1 To the 2 slew shut off solenoids 44. This puts either
side of the slew spool to tank and prevents operation
of the circuits.
2 To the CT3 solenoid on the 8 Station solenoid valve
60, allowing any pressure in the slew brake to drain to
tank.
3 The CT1 slew brake solenoid is de-energised as soon
as the slew lock button is pressed.
Note: The CT3 solenoid is energised either, 5 seconds
after the button is operated, or 5 seconds after the slew
pressure switch opens, depending on which is last to
operate. This allows the slew to come to a standstill on the
cross line relief valves, before the brake is applied.