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Disassembly
NOTE: The suspension should be placed in a fixture
which will allow it to be rotated 180° vertically.
1. Remove charging valve guard and cover over
pressure sensor.
2. Depress charging valve stem to insure all nitro-
gen gas pressure has been released prior to
removing charging valve. Wear face mask or
goggles while relieving nitrogen gas.
3. Remove piston protection shields (8), if
installed.
4. Remove charging valve (12, Figure 3-4).
Remove and discard charging valve gasket.
Remove vent plug (14).
5. Remove vent plug (7). Remove bleeder screw
(6). Remove pressure sensor or plug (13).
6. Place the suspension in a vertical position (pis-
ton rod down). Suspension will contain oil which
will drain through the vent ports. Rotate the sus-
pension 180°. Remove socket head cap screws
(18) and pull suspension piston assembly (5)
from housing (1). The housing bearing (21) will
be removed with the piston assembly.
7. Remove cap screw and hardened washers (2 &
3). Remove piston bearing (4) from piston rod.
Remove ball checks (22) from piston. Slide the
housing bearing (21) off of the piston.
8. Remove and discard wiper seal (15), rod lip
seal (16), buffer seal (17), O-ring (20), and
backup ring (19) from housing bearing.
9. If the spherical bearings (6, Figure 3-3) require
replacement, remove the retainer rings (5).
Press bearing out of bore.
H3-8
Cleaning and Inspection
1. Clean all parts thoroughly in fresh cleaning sol-
vent. Use a solvent that does not leave a film
after evaporation, such as Trichlorethylene,
Acetone or Lacquer Thinner.
When using cleaning agents follow the solvent
manufacturer's instructions.
2. Dry all parts completely using only dry, filtered
compressed air and lint free wiping materials.
3. Inspect all parts for evidence of wear or dam-
age. Inspect plated surfaces for scratches,
nicks or other defects. Replace or repair any
damaged parts.
NOTE: If other repairs are necessary, refer to your
local Komatsu Distributor for repair information and
instructions not covered in this manual.
Assembly
Assembly must be accomplished in a clean, dust free
work area. All parts must be completely clean, dry
and free of rust or scale. Lubricate all interior parts
and bores with fresh suspension oil. (See Oil Specifi-
cations under Oiling and Charging Procedure, this
section). As an alternate, coat seals, wiper and bear-
ing with a light coat of petroleum jelly.
1. Install the spherical bearing (6, Figure 3-3) in
the eye of the piston rod and of the cylinder
housing.
2. Place the ring retainers (5) in position to secure
the bearings.
Rear Suspensions
H03024
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