IV-87
HYDRAULIC UNITSSELF-LEVEL VALVE
At Lowering of the Arm
<Arm Spool In, Bucket Spool Neutral>
Oil ejected from port B opens up plunger (8) and
flows out from port A to go into the rod side of arm
cylinder (1). The oil flowing out from the head side
returns to the tank.
At Bucket Tilt (Forward)
<Bucket Spool Out, Arm Spool Neutral>
The oil in the head side of bucket cylinder (4) first
tries to flow out from port D, but it is blocked by
plunger (9), and instead all oil from the pump flows
into the head side of bucket cylinder (4). The oil
flowing out from the rod side returns to the tank.
At Bucket Tilt (Rear)
<Bucket Spool In, Arm Spool Neutral>
The oil in the rod side of bucket cylinder (4) first
tries to flow out from port C, but it is blocked by
unloading spool (5), and instead all oil from the
pump flows into the rod side of bucket cylinder (4).
The oil flowing out from the head side returns to the
tank.
The following is an explanation of the procedure to
be followed when disassembling the self-leveling
valve. Assembly should be performed following the
same procedure in reverse.
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