Installing Boom Cylinder - Hitachi Zaxis 850LC-3 Operator's Manual

INSTALLING BOOM CYLINDER

IMPORTANT: Take care not to mix up the right and left cyl-
inders. Install the cylinder with the cylinder
piping positioned downward.
1. Pull out the boom foot pin (2) until the end of the pin is
flush with the inside end of the bracket.
2. Apply a film of grease to pin (2).
3. Lift up left-hand boom cylinder (3) with a crane.
WARNING:
• When aligning the centers of the pin and pin hole,
never put fingers into the pin hole.
• When using a hammer, wear safety equipment
such as safety glasses or a hard hat to protect
against injury from flying pieces of metal.
• When inserting the pin, never enter into the area
under the boom cylinder.
4. Align the boom cylinder bottom hole with the boss hole
on the frame. Measure clearance "a." If clearance "a" is 4
mm (0.16 in) or more, remove the shim on the pin and
install it , as illustrated.
5. Align pin hole (4) on the bottom side of the boom cylin-
der with pin hole (5) on the main frame to drive pin (2) in.
Take care not to damage the seal at this time.
6. Tighten bolt (6) to secure pin lock plate (1).
Tightening torque: 400 N•m (40 kgf•m, 290 lbf•ft)
ASSEMBLING
Pin
Boss of Main
Frame Side
Clearance (a)
6-6
Bracket Bracket
2
Shim
Boss of Bottom Side
of Boom Cylinder
3
5 4
6 1
M116-07-025
M1J1-06-017
M116-07-026
M116-07-027