Komatsu 830E-AC Shop Manual page 518

MINOR REPAIR ONLY
(Lower Bearing Structure & Seals)
Bearing Structure Removal
If only rod seals, O-rings, and backup rings (and if
necessary, bearing structure) are to be replaced,
refer to steps below for lower bearing structure
removal.
1. Remove lower bearing structure cap screws
and hardened washers (18 & 19, Figure 2-8).
Install pusher bolts into tapped holes in bearing
flange.
2. Tighten pusher bolts evenly and prepare to sup-
port bearing structure as it exits the suspension
housing. Remove bearing (16).
3. Remove wiper (26), rod lip seal (25), and buffer
seal (24). Remove O-ring (20) and backup ring
(21).
Bearing Structure Installation
1. Install new rod buffer seal (24, Figure 2-8), lip
seal (25) and rod wiper (26).
When installing backup rings with rod seal (25)
and buffer seal (24), be certain radius is posi-
tioned toward the seal as shown in Figure 2-8.
2. Install new O-rings (20) and backup rings (21)
in their appropriate grooves in the lower bearing
structure (16).
NOTE: Backup rings must be positioned toward the
flange of bearing structure as shown in Figure 2-9.
3. Install temporary, guide bolts to ensure bolt
hole alignment as bearing retainer is seated. Lift
lower bearing structure (16) assembly into
place and carefully start into suspension hous-
ing. Install cap screws and hardened washers
(18 & 19). Tighten cap screws to 420 N-m (310
ft lbs) torque.
4. Install wheel, tire and spindle assembly. Refer
to steps in Section G, Wheel, Tire and Spindle
Installation for installation instructions.
H2-8
FIGURE 2-7. PISTON ROD REMOVAL
1. Cap Screw
2. Hardened Flatwasher
3. Cap Screw
4. Hardened Flatwasher
5. Plate
6. Upper Bearing Structure
7. Housing
8. Piston
Front Suspensions
9. Steel Ball (2 ea.)
10. Roll Pin
11. Nut
12. Piston Stop
13. Key
14. O-Ring
15. Backup Ring
16. Cap Structure
H02026