Bearing Structure Removal; Bearing Structure Installation - Komatsu 830E Shop Manual

MINOR REPAIR ONLY
(Lower Bearing Structure & Seals)

Bearing Structure Removal

If only rod seals, O-rings, and backup rings (and if nec-
essary, bearing structure) are to be replaced, refer to
steps below for lower bearing structure removal.
1. Remove lower bearing structure capscrews 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 positioned
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 housing. Install
capscrews and hardened washers (18 & 19).
Tighten capscrews to 310 ft. lbs. (420 N.m)
torque.
4. Install wheel, tire and spindle assembly. Refer to
steps in Section "G", "Wheel, Tire and Spindle
Installation" for installation instructions.
H02016
FIGURE 2-7. PISTON ROD REMOVAL
1. Capscrew
2. Hardened Flatwasher
3. Capscrew
4. Hardened Flatwasher
5. Plate
6. Upper Bearing Struc-
ture
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
H2-5