Manitowoc Grove RT880E User Manual

Grove Published 11-10-2014, Control # 524-00 8-19
RT880E SERVICE MANUAL UNDERCARRIAGE
8
• 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
(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 compo-
nents 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) (Figure 8-22).
3. Measure the diameter of the housing bore. Replace the
housing if the diameter is worn to more than 3.003 in
(76.276 mm) (Figure 8-23).
4. Inspect the linings as described previously.
5. Inspect the threads of the caliper, cylinder caps, and all
fittings. Replace any component that has thread dam-
age that cannot be repaired.
6. Discard all back-up rings, O-rings, and dust seals. Use
new ones when assembling the caliper.
Lining
Backing
Plate
Thickness
Maximum
Disc Wear
Each Side
Minimum Disc
Thickness
0.28 in (7.1
mm)
0.06 in (1.5
mm)
0.50 in (12.7
mm)
0.34 in (8.6
mm)
0.09 in (2.3
mm)
0.44 in (11.2
mm)
Minimum Disc
Thickness
Maximum
Disc Wear
Maximum Disc
Wear Each Side
Original
Disc Thickness
0.625 in (15.875 mm)
Typical Section Through Disc Showing
Recommended Maximum Wear Limits
FIGURE 8-21
Piston
Micrometer
Replace Piston if Outer
Diameter is Worn to Less than
2.995 in (76.073 mm)
FIGURE 8-22
Telescoping
Gauge
Replace Housing if Bore
is Worn to More than
3.003 in (76.276 mm)
FIGURE 8-23

Manitowoc Grove RT880E Specifications

General

Brand	Manitowoc
Model	Grove RT880E
Category	Construction Equipment
Language	English