Operation—Operating The Machine
TX14740,0001F86
–19–16JUN06–1/1
Lower Boom With Engine Stopped—Zaxis
200LC, 250
X9811
–UN–23AUG88
T136343
–UN–18DEC00
Control Valve
1—Lock Nut
2—Boom Manual Lower Screw
If the engine stops during operation and cannot be
restarted, the boom cannot be lowered using the pilot
controller. There is no pilot pressure oil to move the boom
valve spool.
CAUTION: Prevent possible injury from
unexpected machine movement. Clear all
persons from the area before lowering the
boom manually.
1. Lift control valve access door.
CAUTION: To avoid injury from escaping oil
under pressure, stop engine and relieve the
pressure in the system before disconnecting or
connecting hydraulic or other lines. Tighten all
connections before applying pressure.
IMPORTANT: Never loosen boom manual lower screw
more than two turns as screw may
come out and oil will escape.
2. Loosen nut (1). Loosen boom manual lower screw (2)
1/2 turn. The boom will start to lower. The boom
lowering speed can be somewhat adjusted by
loosening screw more.
3. After the bucket is lowered to the ground, tighten
screw, then nut to specifications below.
Specification
Screw (2) Tool—Size
4 mm (Hex wrench)
.................................................
Screw—Torque
6.9 N•m (5.0 lb-ft)
..............................................................
Nut (1)—Torque
13.0 N•m (9.4 lb-ft)
...........................................................
2-2-18
081407
PN=71
