jcb JS300 Service Manual page 888

Cushioned Mode - Hand Controller at Dipper In
A
Pilot pressure enters port A of cushion valve from the left
hand controller. The left-hand inner and outer spools move
over to the right. Oil passes from A to C via gallery I and
flows on to the dipper spool in the main control valve.
Returning oil from the main control valve enters port D and
passes through gallery J to tank via port T. The movement
to the right, of the left hand inner and outer spool cuts off
galleries E, G and H. This allows hot oil from port R, to pass
through gallery F, through the central orifice Z, via port B
to the dipper hand controller, which then warms up.
K Fig 4. ( T E-227)
E-227
C
G
I
E
S
Fig 4. Cushioned Mode - Hand Controller at Dipper In
9813/5100-1
Section E - Hydraulics
D
H
J
Y
Z
F
T
R
Cushion Valve
Operation
B
A409230-C1
E-227