Hitachi Zaxis 200LC Operator's Manual page 76

Lower Boom With Engine Stopped—Zaxis
350
When an engine stops during operation, the boom cannot
be lowered using the pilot controller because there is no
pilot pressure oil to move the boom valve spool.
1. Remove the control valve access cover.
2. Loosen nut (C).
CAUTION: To avoid injury from escaping oil
under pressure, never loosen boom manual
lower needle valve more than 4 turns from
closed position as valve may come out of
housing. Tighten valve and nut before applying
pressure.
Prevent possible injury from unexpected
machine movement. Clear all persons from the
area before lowering the boom with the engine
stopped.
3. Check that the area is clear of all persons before
lowering boom.
Slowly, loosen boom manual lower needle valve (B)
1/2—1 turn. The boom will start to lower.
Turn needle valve out to increase boom lowering
speed or in to decrease lowering speed.
4. After front attachment is on the ground, tighten the
needle valve and then the nut.
Specification
Boom Manual Lower Needle
Valve-to-Housing—Torque ...........................
Boom Manual Lower Needle
Valve-to-Housing Nut—Torque
A—Boom I Section
B—Boom Manual Lower Needle Valve
C—Nut
D—Boom Reduced Leakage Valve
Operation—Operating The Machine
5.9—9.8 N•m (4.4—7.2 lb-ft)
(53—86 lb-in.)
.................. 35—47 N•m (25.8—34.7 lb-ft)
(310—416 lb-in.)
Continued on next page
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TX14740,0001F87 –19–16JUN06–1/2
081407
PN=72