99903514: TELESCOPIC CRANE: 1-18 SECTION 1: OPERATION
leading to the suction port on the pump is not
clogged, or that the hydraulic oil itself does not
have a jelling condition.
CAUTION
FOR CRANE OPERATION IN TEMPERATURES
BELOW -25°F, HYDRAULIC OIL CONFORMING TO
MIL-L-46167 MUST BE USED IN THE CRANE
HYDRAULIC SYSTEM.
CAUTION
FOR WINCH OPERATION IN TEMPERATURES
BELOW -25°F, THE LUBRICATION OIL IN A WINCH
GEARBOX MUST BE CHANGED TO LUBRICATING
OIL CONFORMING TO MIL-L-2105C, GRADE 75W
(GO-75).
5. After the 45 minute warm up period, begin
crane operation as follows:
a. Slowly extend horizontal outrigger cylinders
out approximately 6 inches and retract, extend
out again approximately half way and retract,
and then extend full stroke.
b. Follow the procedure above on crane deploy-
ment, and extend cylinders.
c. When completed, begin crane swing opera-
tion by rotating slowly approximately one eighth
revolution one way, return to previous position
and rotate in opposite direction. Do this several
times, then rotate 90° and return.
d. If equipped with a winch, begin winch opera-
tion by slowly opening the control valve allowing
several revolutions in one direction. Then
reverse the control valve and operate several
revolutions in the opposite direction. Repeat
several times allowing longer operation inter-
vals.
CAUTION
VALVES SHOULD BE ENGAGED SLOWLY DURING
WARM UP CYCLE TO PREVENT SUDDEN
HYDRAULIC SPIKES WHICH WILL DAMAGE
HYDRAULIC COMPONENTS.
NOTE
IT IS NORMAL FOR SOME OIL SEEPAGE TO
OCCUR AROUND PISTON ROD SEALS DURING
THE WARM UP OPERATION. SEEPAGE SHOULD
CEASE WHEN HYDRAULIC SYSTEM HAS
REACHED OPERATING TEMPERATURE.
1-15: HAND SIGNALS
Hand signals can be used to communicate
between crane operators and assistants when
the job site noise level is to high to communi-
cate in othery ways.
Signals to the operator shall be in accordance
with those signals illustrated in this section,
unless voice communication is utilized. Signals
shall be discernible or audible at all times. No
response by the operator is to be made unless
the signal is clearly understood.
For operations not covered by the illustrated
hand signals, additions to or modifications may
be made. These special signals must be
agreed upon by the operator and signal person
before the crane is operated.
If verbal instructions are required rather than
hand signals, all crane motions must be
stopped before doing so.
Figure A-19 includes an illustration of the hand
signal, the operation associated with the signal,
and a description of the signal. The operator
and signal person must review these signals
and agree to their use before implementation.
For complete hand signal information, refer to
the following publication of The American Soci-
ety of Mechanical Engineers:
Mobile and Locomotive Cranes
(ASME/ANSI B30.5)
The hand signals presented by The American
Society of Mechanical Engineers have been
accepted by the Occupational Safety and Health
Administration (OSHA).
20030115
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