OM 28Z3 US – Edition 2.0 * 28Z3b340.fm 3-67
Operation
3.33 Connections for auxiliary hydraulics
Important!
Follow the instructions in the Operator's Manual of the attachment manufacturer
for connecting the auxiliary hydraulics to attachments.
Grab couplings
Connect and disconnect the hydraulic couplings as follows:
☞ Park the machine on firm and level ground.
☞ Extend stick ram A halfway through.
☞ Stop the engine.
☞ Turn the starting key to position “1”.
☞ Release the pressure on bucket ram A by moving the right-hand side control lever to
the left and right.
☞ Fold the control lever base up.
☞ Align lock sleeve C with lock ball B.
☞ Pull lock sleeve C upward.
☞ The coupling opens.
Connecting the coupling:
☞ Clean the male and female ends of the coupling
☞ Align the male and female ends of the coupling and push them together until move-
ment stops.
☞ Pull the coupling sleeve away from the ball (Fig. 43) until it stops moving.
☞ Rotate the sleeve (Fig. 43) to misalign the slot in the sleeve with the ball in the opposite
half of the coupling. This will prevent unintended sleeve movement that may cause the
coupling to disconnect unintentionally.
Changing over the ball-type cock:
Bucket operation:
☞ Set the ball-type cocks to position A.
Grab operation:
☞ Set the ball-type cocks to position B.
Fig. 91: Connections for auxiliary hydraulics
V
U
T
Port Stick (left) Stick (right)
T ☞ Pressure line
U ☞ Large return line
V ☞ Pressure line
Fig. 92: Grab couplings
B
A
C
Fig. 93: Grab ball-type cock
B
A
B
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