Fatigue Of Welded Structures; Loctite - JLG TOUCAN 1010 Service Manual

5
Entrapped air may be removed from cylinders (having
wet rods) by cycling. On certain cylinders, a plugged
port is provided on the barrel end to bleed off entrapped
air.
DANGER
Do not attemp t to loosen fittings in
pressurized lines or while the hydraulic pump
is in operation. Failure to comply could result
in death or injury to personnel.
If air entrapment should persist, it may become
necessary to bleed air by loosening various clamp-
and screw-type fittings. If the above procedures fails
to eliminate air entrapment, contact your JLG
distributor.
NOTE
When servicing the hydraulic system, use a
container to collect the oil from the hydraulic
lines or components and prevent it from
spilling on the work platform or on the
ground.

5.11. Fatigue of welded structures

Experience has shown that highly stressed welded
structures - when repeatedly subjected to varying
stresses caused by twisting, shock, bending and
intentional and/or unintentional overloads - often
become subject to weld cracking which may be
attributed to fatigue of the welded joint. This condi-
tion is not uncommon in construction equipment.
Equipment should be periodically inspected for
evidence of weld fatigue. The frequency of these ins-
pections should be commensurate with the :
- Age of equipment.
- Severity of application.
- Experience of operators and maintenance
personnel.
A visual inspection of the following high-stress areas
should be made part of the owner's planned preventive
maintenance program :
- Welded joint of the plates making up the
chassis base plate.
- Hydraulic wheel motors attachment plates (rear
axle).
- Front axle beam connection on chassis plate.
- Steering brackets.
- Mast section #1 connection on turntable plate.
- Hydraulic cylinder end connections.
- Tie rods end connections.
44
MAINTENANCE
- Roller pins, tie rods, hydraulic cylinders
The items listed above are provided as a guide. Do
not limit your inspection plan to the areas listed. A
thorough visual inspection of all weldments is good
practice.
If you require more detailed inspection instructions
and/or repair procedures, contact your local JLG
distributor for assistance.
Welding from/on work platform
When welding from/on work platforms, follow these
precautions :
- When welding from the platform, always run
- When welding on the work platform, disconnect
5.12. LOCTITE®
Loctite®-type adhesives contain chemicals
that may be harmful if misused. Read and
follow the instructions on the container.
Always follow the directions on the Loctite® contai-
ner. Not all Loctite® types are suitable for all applica-
tions.
attachment points.
the welder ground wire directly to the structure
that is being welded. Do not allow any part of
the work platform to contact welding rods,
holders, ground terminals or the structure being
welded. Do not ground the welder through the
machine as this can cause arcing inside the
turntable bearing or inside hydraulic cylinders.
all electronic components. When welding on
the frame on all work platforms, connect the
welder ground wire to the machine frame - as
close to the area being welded as possible.
When welding on the superstructure, connect
the welder ground wire to the machine
superstructure - as close to the area being
welded as possible. This is to prevent arcing
inside the turntable bearing.
DANGER
T o ucan 1010
5
Model
Révision 04-2006