OPERATOR'S MANUAL MAINTENANCE

Section E - Hydraulics
Slew Motor
Slew Brake Operation
E-134 E-134
9803/9880-3
Slew Brake Operation
Cylinder block F is splined to output shaft G. Two friction
plates A are splined to the outer edge of the cylinder block
and are interleaved between three counter plates B which
are fixed to the slew motor casing E.
The brakes are applied when the hydraulic pressure at port
X is zero. Spring C pressure forces piston D down to press
the friction plates and the counter plates together, thereby
locking cylinder block F and casing E and preventing
rotation.
The brakes are released when hydraulic pressure is
applied to port X. Oil enters chamber Y and pushes brake
piston D up, against the pressure of spring C, to release
the previously locked friction plates A and counter plates
B. Cylinder block F is now free to rotate within casing E.
C075120
Fig 2.
B
F
C
DE
G
A
Y
X