Komatsu 830E-AC Shop Manual page 709

STEERING CYLINDER
For steering cylinder removal and installation proce-
dure, refer to Section G.
Disassembly
1. Remove cap screws (9, Figure 5-21) and pull
gland (8) rod (10) and piston (5) from housing
(6).
2. Remove O-ring & backup ring (7). Remove nut
(2) and remove piston (5). Remove bearing (3)
and piston seal (4).
3. Pull rod (10) from gland (8). Remove rod wiper
(11) and rod seal (12).
Inspection and Cleaning
1. Clean all parts using fresh cleaning solvent, lint
free wiping cloth and dry compressed air.
2. Inspect cylinder housing, gland, piston and rod
for signs of pitting, scoring or excessive wear.
3. Lubricate the cylinder housing, gland, piston
and rod with clean, type C-4 hydraulic oil. Lubri-
cate new seals, wiper and bearing using clean,
type C-4 hydraulic oil.
Assembly
1. Install new O-ring and backup ring (7, Figure
5-21). The backup ring must be positioned
toward the rod eye.
2. Install new rod seal (12) and rod wiper (11) in
gland (8).
1. Vent Plug
2. Locknut
3. Bearing
L05035
NOTE: Installation of the piston seal may require the
following procedure.
FIGURE 5-21. STEERING CYLINDER ASSEMBLY
4. Piston Seal
5. Piston
6. Housing
Steering Component Repair
3. Push rod (10) through top of gland, slowly
advancing rod over rod seal and rod wiper.
4. Install new piston seal (4) and bearing (3) on
piston (5). Make sure the piston seal is tight on
piston.
a. Heat the piston seal assembly in boiling
water for 3 to 4 minutes.
b. Remove piston seal assembly from the water
and assemble on the piston. Do not take
longer than 5 seconds to complete assembly
as seal will take a permanent set.
c. Apply even pressure to avoid cocking the
seal.
d. If the seal assembly has taken a slightly
large set, the use of a belt type wrench or
similar tool can be used to compress the seal
to the desired diameter, (tight on piston).
5. Install piston on rod structure and secure in
place with locknut. Tighten locknut to 2712 N·m
(2000 ft lbs) torque.
6. Carefully install rod and gland assembly into
cylinder housing. Insure backup ring and O-ring
on gland are not damaged during installation.
7. Install cap screws (9) and tighten to 420 ± 42
N·m (310 ± 31 ft lbs) torque.
7. O-Ring & Backup Ring
8. Gland
9. Cap Screws
10. Rod
11. Rod Wiper
12. Rod Seal
L5-25