Komatsu 830E-AC Shop Manual page 520

5. Remove cap screws and washers (18 & 19, Fig-
ure 2-8). Install pusher bolts and remove lower
bearing structure (16).
6. Remove and discard rod wiper seal (26) lip seal
(25) and buffer seal (24). Remove and discard
O-rings (20) and backup rings (21).
Assembly
NOTE: All parts must be completely dry and free of
foreign material. Lubricate all interior parts with clean
®
HYDRAIR suspension oil (see Oil Specification
under "Oiling and Charging Procedure").
Take care not to damage the machined or plated
surfaces, O-rings or seals when installing piston
assembly.
When installing backup rings with rod lip seal
(25) and buffer seal (24), be certain radius is posi-
tioned toward the seal as shown in Figure 2-8.
1. Install new rod buffer seal (24, Figure 2-8), lip
seal (25), and rod wiper (26).
2. Install new O-rings (20) and backup rings (21)
in their appropriate grooves in the bearing struc-
ture (16).
NOTE: Backup rings must be positioned toward
bearing retainer bolt flange as shown in Figure 2-9.
3. Install lower bearing assembly (16) into lubri-
cated suspension housing. Install cap screws
and hardened lockwashers (18 & 19) through
retainer flange and into tapped holes in hous-
ing. Tighten to 420 N-m (310 ft lbs) torque.
4. Install new backup rings and O-rings (14 & 15,
Figure 2-7) in end cap grooves. Backup rings
must be positioned toward the flange on the
end cap.
H2-10
FIGURE 2-9. BACKUP RING PLACEMENT
1. O-Ring
2. Backup Ring
5. Slide upper bearing structure (6) over cap struc-
ture rod.
6. Install key (13) and piston stop (12) on cap
structure rod. Make sure piston stop is fully
seated against the rod shoulder. Install locknut
(11) against piston stop. Tighten locknut one
half turn further, until hole for the roll pin (10) is
in alignment. Install roll pin.
7. Attach a lifting device to top side of end cap
assembly. Lower assembly down on piston (8).
Insert steel balls (9) in holes in piston prior to
fully seating bearing on top of piston. A small
amount of petroleum jelly will prevent the balls
from dropping out during assembly.
Front Suspensions
3. Bearing Structure
H02026