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INSTALLING BOOM CYLINDER
IMPORTANT: Take care not to mix up the right and left
cylinders. Install the cylinder with the
cylinder piping positioned downward.
1. Pull out boom foot pins (2) until the end of the pin is
flush with the inside end of the bracket.
2. Apply a film of grease to pins (2).
3. Lift up left-hand boom cylinder (3) with a crane.
d
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 boom cylinder (3).
4. Align boom cylinder (3) 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 boom cylinder
(3) with pin hole (5) on the main frame to drive pins (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)
7. After installing the bottom side of the left-hand boom
cylinder to the main frame, lay the rod side of the boom
cylinder onto supporting stand (7).
8. Install the right-hand boom cylinder in the same
procedure as taken in the steps 2 to 5 above.
d
WARNING:
• Stop the engine. Move the control levers back and
forth, and right and left several times to release
the remaining pressure in the hydraulic line.
• Before connecting hoses between the boom
cylinder and the machine, gradually loosen bolts
securing the covers to the ends of the hydraulic
piping on the machine to release the trapped oil
pressure in the piping.
9. Gradually loosen bolts securing the covers to the ends
of the hydraulic piping on the machine to release the
trapped oil pressure in the piping. Then, remove the
covers.
ASSEMBLING
Boss of Main
Frame Side
Clearance (a)
6-19
Bracket
2
Shim
Pin
Boss of Bottom Side
of Boom Cylinder
5
4
6
1
Bracket
M116-07-025
M1J1-06-017
3
M116-07-026
M116-07-027
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