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February 16, 2011
ATTENTION:
This notice is being issued to advise you of the requirement to update certain
Caterpillar (“CAT”) Telehandlers that were manufactured by JLG Industries,
Inc. (“JLG”). This program must be completed as soon as possible on all
affected machines.
PROBLEM:
When the fork tilt up function is continuously held and the tilt cylinder reaches end of stroke and
then the lift up function is activated while continuing to activate fork tilt up, a void in the barrel
end of the lift cylinder is created. As a result of this void, when lift up or down is initiated, the
boom will drop in an uncontrolled manner until the void is filled with hydraulic oil.
In has recently been determined that the load charts on certain CAT Model TH336, TH337,
TH406 and TH407 telehandlers do not have the correct load values. Lifting certain loads
specified on those load charts will cause the machine to tip-over.
This bulletin requires the installation of a compensating valve kit in order to eliminate the
possibility of a void being created in the lift cylinder or the replacement of the load charts or both
on all affected machines.
AFFECTED PRODUCTS:
This issue affects certain CAT Telescopic Material Handler Models TH336, TH337, TH406 and
TH407 having the following Serial Numbers.
Model
Affected Serial Number(s)
GROUP A
Load Chart Book Replacement & Compensating Valve Kit Installation Procedure
TH336
TDE00102, 104-116, 118-134, 136, 138-139, 141, 143, 145-147, 149-
150, 152-154, 157.
TH337
TDF00101-103, 105-184, 186, 189-193, 195, 198.
SERVICE LETTER
Reference: #C111C3
SAFETY
PRODUCT IMPROVEMENT PROGRAM FOR THE INSTALLATION
OF A HYDRAULIC COMPENSATING VALVE OR LOAD CHART
REPLACEMENT OR BOTH ON CERTAIN CAT MODEL TH336,
TH337, TH406 AND TH407 TELEHANDLERS.
#C111C3
