Komatsu 830E-AC Shop Manual page 531

3. Install the wiper seal (15, Figure 3-6), rod lip
seal (16), and buffer seal (17). When installing
backup rings with rod seal (16) and step seal
(17), be certain radius is positioned toward the
seal and the white dot is positioned away from
the seal as shown in Figure 3-6.
4. Install O-ring (20) and backup ring (19) on the
bearing (21). Backup rings must be positioned
toward the flange of the bearing.
5. Slide the bearing (21) onto the lubricated piston
rod (5).
6. Place the ball checks (22) in the piston and
install the piston rod bearing (4) with the cap
screws and hardened washers (2 & 3). Tighten
the cap screws to 420 N-m (310 ft lbs) torque.
7. With the lubricated housing (1) held in a vertical
position, slide the piston assembly part way into
the housing. Slide the loose housing bearing
down onto the housing and fasten with socket
head cap screws (18). Tighten the cap screws
to standard torque. Use care during piston
installation to prevent damage to machined and
chrome surfaces.
8. Install the bleeder screw (6, Figure 3-6) and
vent plug (7). Install vent plug (14) and tighten
both vent plugs to 87 N-m (64 ft lbs) torque.
9. Install vent plug (11) and pressure sensor or
plug (13). Install protective cover.
10. Install shield (8).
11. Using new gasket, install charging valve.
Tighten large hex of charging valve to 22.4 N-m
(16.5 ft lbs) torque.
H03024
PRESSURE TEST
After rebuild is complete, suspension assembly
should be tested for leakage.
When pressure testing, suspension must not be
allowed to extend. Assembly must be mounted in
a container that is adequate to prevent piston
extension.
1. Using air or nitrogen, pressurize suspension to
7585 ± 1380 kPa (1100 ± 200 psi) through the
charging valve and maintain pressure for twenty
(20) minutes minimum.
No leakage is permissible.
2. Release pressure from suspension assembly
and remove from containment structure. Do not
remove charging valve.
3. Install charging valve guard.
4. If suspension is to be stored, install suspension
oil prior to storage. (Refer to Rear Suspension
Oiling this section.)
5. Protect exposed chrome surface to prevent
damage during storage and handling.
Rear Suspensions H3-9