Komatsu 830E-AC Shop Manual page 617

For Rough Metal Parts
Use a cleaning solvent or a weak alkaline solution in
a hot solution tank to clean rough metal parts. If a hot
solution tank is used, follow the instructions below.
1. Leave the rough parts in the tank until they are
completely cleaned and heated.
2. Remove the rough parts from the tank.
3. Wash the parts with water until the alkaline
solution is removed.
Dry and Inspect Parts
1. Use soft, clean paper, cloth rags or compressed
air to completely dry parts immediately after
they are cleaned.
2. Carefully inspect all parts for wear or damage
before assembly.
3. Repair or replace worn or damaged parts.
Corrosion Protection
Apply clean hydraulic oil to the cleaned and dried
parts that are not damaged and are to be immedi-
ately assembled. Do NOT apply fluid to the brake lin-
ings or the disc.
If parts are to be stored, apply a special material that
prevents corrosion to all surfaces. Do NOT apply the
material to the brake linings or the disc. Store the
parts inside special paper or other material that pre-
vents corrosion.
J06025 10/06
INSPECTION
Caliper Parts
1. inspect the pistons, housing bores and O-ring
2. Measure the outer diameter of the service pis-
3. Measure the outer diameter of the parking pis-
4. Measure the diameter of the housing service
5. Measure the diameter of the housing parking
6. Inspect caliper ports and end plate bolt holes for
• Fluid ports - Use 9/16-18 UNF-2B tap
• Fluid ports - Use 7/16-20 UNF-2B tap
• End plate bolt holes - Use 3/4-16 UNF-2B tap
NOTE: Replace any component that has thread
damage that cannot be repaired.
7. Discard all backup rings, O-rings and dust
Armature Speed Rear Disc Brakes
grooves for scratches or corrosion. Remove
small scratches or corrosion with a fine emery
cloth. Replace the components if they are worn
beyond wear limits or if there are large
scratches or large amounts of corrosion.
ton. Replace the piston if the outer diameter is
less than 76.07 mm (2.995 in.).
ton. Replace the piston if the outer diameter
measures less than 63.37 mm (2.495 in.) and
126.90 mm (4.996 in.).
piston bore. Replace the housing if the diameter
exceeds 76.30 mm (3.004 in.).
piston bore. Replace the housing if the diameter
exceeds 63.60 mm (2.504 in.) and 127.13 mm
(5.005 in.).
thread damage. Use the appropriate taps lubri-
cated with light oil to inspect tapped holes for
thread damage and to clean up minor thread
damage.
boots and use new ones when servicing the cal-
iper.
J6-13