Manitowoc Grove RT765E-2 Service And Maintenance Manual page 273

RT765E-2 SERVICE MANUAL
Piston Fluid
Leaks
Piston Fluid
Leaks
• 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.
GROVE
Bleeder Screw
Fluid Leaks
Inlet
Cylinder
Fitting
Cap
Fluid
Fluid
Leaks
Leaks
FIGURE 8-20
Published 9-04-2014, Control # 422-08
Maximum
Disc Wear
Typical Section Through Disc Showing
Recommended Maximum Wear Limits
Lining
Maximum
Backing
Disc Wear
Plate
Each Side
Thickness
0.28 in 0.06 in
(7.1 mm) (1.5 mm)
0.34 in 0.09 in
(8.6 mm) (2.3 mm)
Caliper Parts
1. Inspect the pistons, housing bores, and O-ring grooves
for scratches or corrosion. Remove small scratches or
c o r r o s i o n w i t h f i n e e m e r y c l o t h . R e p l a c e t h e
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 2.995 in
(76.073 mm). Refer to Figure 8-22.
Micrometer
Replace Piston if Outer
Diameter is Worn to Less than
2.995 in (76.073 mm)
UNDERCARRIAGE
Minimum Disc
Thickness
Maximum Disc
Wear Each Side
Original
Disc Thickness
0.625 in (15.875 mm)
FIGURE 8-21
Minimum Disc
Thickness
0.50 in
(12.7 mm)
0.44 in
(11.2 mm)
Piston
FIGURE 8-22
8-19
8