8-19
RT770E UNDERCARRIAGE
Published 11/26/2014, Control # 447-05
• Pistons: If fluid leaks at a piston, disassemble the
caliper. Inspect the piston, the bore, the o-rings, and
back-up rings. Service as necessary.
• Cylinder Cap: If fluid leaks at a cylinder cap, tighten
the cylinder cap, the inlet fitting, and the plug. If the
leak continues, disassemble the caliper. Inspect the
cylinder cap threads, the housing threads, and the
o-ring. Service as necessary.
• Bleeder Screw: If fluid leaks at the bleeder screw,
tighten the bleeder screw. If the leak continued,
replace the bleeder screw.
• Inlet Fitting: If fluid leaks at the inlet fitting, tighten
the fitting. If the leak continues, replace the O-ring.
Dust Seals
Ensure the dust seals are soft and flexible. Disassemble the
caliper and replace dust seals that are hard or damaged.
Disc
If the disc is worn beyond the wear limits, replace the disc.
Refer to Figure 8-21.
Caliper Parts
1. Inspect the pistons, housing bores, and o-ring grooves
for scratches or corrosion. Remove small scratches or
corrosion with fine emery cloth. Replace the
components if they are worn beyond wear limits or if
there are large scratches or large amount of corrosion.
2. Measure the diameter of the piston. Replace the piston if
the outer diameter is worn less than 76.073 mm
(2.995 in). Refer to Figure 8-22.
Inlet
Fitting
Fluid
Leaks
Cylinder
Cap
Fluid
Leaks
Piston Fluid
Leaks
Bleeder Screw
Fluid Leaks
Piston Fluid
Leaks
FIGURE 8-20
Lining
Backing
Plate
Thickness
Maximum
Disc Wear
Each Side
Minimum Disc
Thickness
7.1 mm
(0.28 in)
1.5 mm
(0.06 in)
12.7 mm
(0.50 in)
8.6 mm
(0.34 in)
2.3 mm
(0.09 in)
11.2 mm
(0.44 in)
Minimum Disc
Thickness
Maximum
Disc Wear
Maximum Disc
Wear Each Side
Original
Disc Thickness
15.875 mm (0.625 in)
Typical Section Through Disc Showing
Recommended Maximum Wear Limits
FIGURE 8-21
Piston
Micrometer
Replace Piston if Outer
Diameter is Worn to Less than
76.073 mm (2.995 in)
FIGURE 8-22
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