Grove Published 11-10-2014, Control # 524-00 1-15
RT880E SERVICE MANUAL INTRODUCTION
Equipment should be periodically inspected for evidence of
weld fatigue. The frequency of these inspections should be
commensurate with the age of the equipment, the severity of
the application, and the experience of the operators and
maintenance personnel.The following are known high stress
areas applicable to Grove machines, and a visual inspection
of these areas should be made part of an owner’s planned
preventive maintenance program:
• Power Telescope Boom - wear pad retaining structures,
hydraulic cylinder attaching points, boom pivot shaft
retaining structures.
• Outrigger pads, beams, boxes and attachment
structures.
• Main frames - generally in the area of doubler plates and
cross members; at the junction of front and rear frame
members on truck cranes.
• Turntable bearing connection (where bearing is welded
to the crane superstructure or chassis).
• Counterweight support structures.
• Chassis axle and suspension mounting structures.
• Hydraulic cylinder end connections.
The above is provided only as a guide, and your inspection
plan should not be limited to the areas listed. A thorough
visual inspection of all weldments is good practice.
Anyone requiring more detailed inspection instructions and/
or repair procedures may request them by contacting the
local Manitowoc Cranes distributor.
Loctite®
Always follow the directions on the Loctite® container as not
all Loctite types are suitable for all applications.Various types
of Loctite are specified throughout the Service Manual. The
following types of Loctite brand adhesives are available from
the Parts Department of the local Manitowoc Cranes
distributor.
Application of Medium Strength Loctite
NOTE: The fastener may be re-used; the adhesive may be
re-applied over cured adhesive residue.
The following procedure covers the proper application and
curing method for medium strength Loctite adhesive/sealant
(Loctite #243) and primer (Locquic Primer T 7471). (Primer is
not required with Loctite #243, but is with Loctite #242.)
Primer Application
NOTE: It is not necessary to bathe the threads in primer.
1. Ensure the threaded surface, both male and female, is
clean and free of dirt and oil. Apply a light spray coating
of primer to both male and female parts to be joined to
clean and accelerate the curing process.
2. Allow the part to dry prior to adhesive/sealant applica-
tion.
Adhesive/Sealant Application
1. Apply a bead perpendicular to the thread, several
threads wide, in the approximate area of threaded
engagement (Figure 1-3).
2. In a blind hole application, a bead of several drops of
adhesive should be applied into the bottom of the hole to
be hydraulically forced up during engagement.
3. After application and engagement of mated threads,
bonding will occur within five (5) minutes if primed prior
to engagement. Fixture may take up to 30 minutes on
unprimed parts.
4. Time required to achieve full strength is 24 hours. Maxi-
mum ultimate strength is achieved using no primer with
this specific threadlocking adhesive.
Fasteners and Torque Values
Use bolts of the correct length. A bolt which is too long may
bottom before the head is tight against the part it is to hold. If
a bolt is too short, there may not be enough threads engaged
to hold the part securely. Threads can be damaged. Inspect
them and replace fasteners, as necessary.
Torque values should correspond to the type bolts, studs,
and nuts being used.
The torque tables are provided by Manitowoc for reference
when performing maintenance.
Use of proper torque values is extremely important. Improper
torquing can seriously affect performance and reliability.
Identification of fastener grade is always necessary. When
marked as a high strength bolt (grade 5, 8, etc.), the
mechanic must be aware that he/she is working with a highly
stressed component and the fastener should be torqued
accordingly.
CAUTION
Loctite® type adhesives contain chemicals that may be
harmful if misused. Read and follow the instructions on
the container.
BEAD APPLICATION
4203
FIGURE 1-8
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