Komatsu 830E-AC Shop Manual page 481

WHEEL HUB AND SPINDLE ASSEMBLY
Removal
The following instructions will cover the complete
removal, installation, disassembly, assembly and
bearing adjustment of front wheel hub and spindle. If
only brake service is to be performed, refer to Sec-
tion "J", "Brake Circuit".
Do not loosen or disconnect any hydraulic brake
line or component until engine is stopped, key
switch is turned OFF for 90 seconds and drain
valves on brake accumulators are opened.
For ease of handling, refer to the "Front Tire and Rim
Removal" instructions to remove front tire and rim
assembly.
1. Bleed down the steering accumulator by shut-
ting down the engine and turn the key switch
OFF for at least 90 seconds. Open drain valves
at the bottom of each of the brake system accu-
mulators. Allow adequate time for the accumu-
lators to bleed down.
2. Disconnect brake lines leading to each caliper
and main brake supply line (1, Figure 3-1) at the
junction block. Plug or cap all lines to prevent
contamination of the hydraulic system.
G03029
FRONT WHEEL HUB AND SPINDLE
Front Wheel Hub and Spindle
FIGURE 3-1. BRAKE SUPPLY LINES
1. Brake Supply Line
2. Junction Block
3. Caliper Supply Lines
3. Remove any grease lines being used for a
group lube or automatic lube system for the
steering cylinder and tie rod. Cap all lines.
4. Remove cap screws and washers securing
brake line junction block (2), and main brake
supply line (1) from spindle assembly. Plug or
cap all lines to prevent contamination of the
hydraulic system.
5. If internal work is to be performed, remove hub
drain plug (24, Figure 3-5) and allow oil to drain.
6. Remove lubrication lines from tie rod and steer-
ing cylinder. Disconnect tie rod and steering cyl-
inder rod from spindle being removed. Refer to
"Steering Cylinder and Tie Rod Removal" in this
section.
7. Position a fork lift under the wheel hub and
spindle assembly as shown in Figure 3-4.
4. Lubrication (Grease)
Supply Lines
G3-3