23
BRAKE ASSEMBLY
DISASSEMBLY
1. Install the spring compressor tool as show. If a hydrau-
lic press is available, only part A of the tool is required.
Tighten the nut above part A or apply hydraulic pressure
to slightly compress the spring and relieve load on the
retaining ring (Item 94). Carefully remove the retaining
ring.
2. Slowly and carefully unscrew the nut above part A until
spring pressure is completely released (spring travel is
approximately 4 inches [10 cm]). Remove the compres-
sor tool.
3. Remove the spring stop (Item 93), spring (Item 91) and
piston stop (Item 92) from the brake cylinder.
4. Remove the brake piston (Item 90). Remove and dis-
card both sets of piston O-rings and backup rings (Items
86, 87, 88, 89).
5. Turn the assembly over to access the brake plates. Re-
move the retaining ring (Item 81). Remove the spacer
plate (Item 82), steel separator discs (Item 83) and fric-
tion discs (Item 84).
Thoroughly clean and inspect all parts, paying close at-
tention to the sealing surfaces of the brake piston. Place
each friction disc on a flat surface and check for distortion
with a straight edge. Friction material should appear even
across the entire surface and the groove pattern should
be visible. Replace friction discs if splines are worn to a
point, disc is distorted, friction material is worn unevenly
or groove pattern is no longer visible. Place each steel
brake plate on a flat surface and check for distortion with a
straight edge. Check surface for signs of material transfer
or heat. Replace steel discs if splines are worn to a point,
disc is distorted or heat discolored.
Check the brake release passage to be sure it is clean and
completely open.
Inspect both sets of large tapered roller bearings (Items
49, 50, 51, 52) for signs of damage or excessive wear.
The bearing rollers should not exhibit any irregularities. If
the rollers show any sign of spalling, corrosion, discolor-
ation, material displacement or abnormal wear, the bear-
ing should be replaced. Likewise, the cage should be in-
spected for wear or deformation. If there is any damage
that would impair the cage’s ability to separate, retain and
guide the rollers properly, the bearing should be replaced.
Summary of Contents for CH330
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