DOC-20230111-WA0038.

FRONT ATTACHMENT / Cylinder
Assemble Arm Cylinder
• Be sure to read “Precautions for Disassembly and
Assembly” thoroughly on page W1-1-1 before
starting any repair work.
1. Press bushing (7) into cylinder head (6) with a
press. Install snap ring (8) into the cylinder head.
Bushing Special Tool: 60 mm (ST 8012)
IMPORTANT: Install U-ring (4) with its lip facing
bushing (7).
Install buffer ring (5) with the protrusion
part and slits facing bushing (7).
2. Install backup ring (3), U-ring (4) and buffer ring
(5) into cylinder head (6).
3. Install wiper ring (2) into cylinder head (6) using
ST 8012.
Wiper Ring Special Tool: ST 8012
IMPORTANT: Install backup ring (9) to the piston
rod (1) boss side of O-ring (11).
4. Install O-rings (10), (11) and backup ring (9) onto
cylinder head (6).
5. Install the cylinder head (6) assembly into piston
rod (1).
Cylinder Head Special Tool: ST 8012
IMPORTANT: After installing O-ring (18), check
there is no twisting.
6. Install O-ring (18) and seal ring (17) onto piston
(14) by guiding them with a wooden spatula so
that they are not installed into the slide ring (13)
groove.
IMPORTANT: Install slide rings (13), (19), be sure
that their slit sections align with
each other.
7. Install slide rings (13), (19) onto piston (14).
IMPORTANT: Install cushion seal (21) with the slit
side facing piston (14).
Install cushion bearing (22) with the
wider split circumference side facing
the cylinder bottom.
8. Install cushion seal (21) and cushion bearing (22)
onto piston rod (1).
9. Slide cushion bearing (22) toward piston (14) to
install stopper (23).
Slide the cushion bearing toward stopper to install
snap ring (20).
10. Install piston (14) and shim (12) into piston rod (1).
Tighten the piston using special tool (ST 5908)
according to the matching mark.
Piston Turning Special Tool: 70 mm (ST 3261)
: 2450 N⋅m (250 kgf⋅m, 1810 Ibf⋅ft)
ST 5908
W158-04-02-022
W4-2-27