Grove Published 11-10-2014, Control # 524-00 1-11
RT880E SERVICE MANUAL INTRODUCTION
Double Row, Tapered Roller
Double row, tapered roller bearings are precision fit during
manufacture and components are not interchangeable. The
cups, cones, and spacers are usually etched with the same
serial number and letter designator. If no letter designators
are found, wire the components together to assure correct
installation. Reusable bearing components should be
installed in their original positions.
Heating Bearings
Bearings which require expansion for installation should be
heated in oil not to exceed 250 °F (121 °C). When more than
one part is heated to aid in assembly, they must be allowed
to cool and then pressed together again. Parts often
separate as they cool and contract.
Installation
Lubricate new or used bearings before installation. Bearings
that are to be preloaded must have a film of oil over the entire
assembly to obtain accurate pre-loading. When installing a
bearing, spacer, or washer against a shoulder on a shaft, be
sure the chamfered side is toward the shoulder.
When pressing bearings into a retainer or bore, uniformly
apply pressure to the outer race. If the bearing is pressed on
the shaft, uniformly apply pressure on the inner race.
Preload
Preload is an initial load placed on the bearing at the time of
assembly. Whether a tapered roller bearing should have
preload could depend on any of several conditions: rigidity of
the housings and shaft, bearing spread, speed of operation,
etc.
To determine whether a bearing requires preload or end
clearance, consult the disassembly and assembly
instructions pertaining to that bearing.
Care should be exercised in applying preload. Misapplication
of preload to bearings requiring end clearance can result in
bearing failure.
Sleeve Bearings
Do not install sleeve bearings with a hammer. Use a press
and be sure to apply the pressure directly in line with the
bore. If it is necessary to drive on a bearing, use a bearing
driver or a bar with a smooth flat end. If a sleeve bearing has
an oil hole, align it with the oil hole in the mating part.
Gaskets
Be sure the holes in the gaskets correspond with the
lubricant passages in the mating parts. If it is necessary to
make gaskets, select material of the proper type and
thickness. Be sure to cut holes in the right places. Blank
gaskets can cause serious damage.
When removed, always install new cylinder head and
manifold gaskets using recommended gasket compound on
head gaskets to allow uniform sealing.
Batteries
Clean batteries by scrubbing them with a solution of baking
soda and water. Rinse with clear water. After cleaning, dry
thoroughly and coat terminals and connections with an anti
corrosion compound or grease.
If the machine is to be stored or not used for an extended
period of time, the batteries should be removed. Store the
batteries in a cool (not subfreezing), dry place, preferably on
wooden shelves. Never store on concrete. A small charge
should be introduced periodically to keep the specific gravity
rating at recommended level.
Hydraulic Systems
Cleanliness
Contaminants in a hydraulic system affect operation and will
result in serious damage to the system components. Dirty
hydraulic systems are a major cause of component failures.
Keep the System Clean
When removing components of a hydraulic system, cover all
openings on both the component and the crane.
If evidence of foreign particles is found in the hydraulic
system, flush the system.
Disassemble and assemble hydraulic components on a
clean surface.
Clean all metal parts in a nonflammable cleaning fluid. Then
lubricate all components to aid in assembly.
Sealing Elements
Inspect all sealing elements (O-rings, gaskets, etc.) when
disassembling and assembling the hydraulic system
DANGER
High Pressure/Temperature Hazard!
Exercise extreme care around pressurized hydraulic
systems. DO NOT work on a hydraulic system while it is in
operation or until all pressure is released.
Hydraulic oil is hot, it can cause severe burns.
Pressurized hydraulic oil can cause death or serious
injury.
Stay clear of all hydraulic oil leaks. Relieve system
pressure and use a piece of cardboard or paper to check
for leaks. Do not use your hands.
Fluid injected into skin must be surgically removed within
a few hours by a doctor familiar with this type of injury or
gangrene will result.
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