
108 31200243
Maintenance Section
Boom Chain - Inspect/
Lubricate
Note: The information that follows will only relate to
machines that have a three-section boom.
Illustration 178 g00856575
The boom extension chain and boom retraction chain
must be removed from the boom for inspection. After
removal, measure the chains for wear. Chains which are
serviceable must be lubricated before reinstalling the
chains. For the correct procedure, refer to the
Hydraulic System Systems Operation, Testing and
Adjusting, "Boom Chain - Clean/Inspect/Lubricate" or
refer to your Caterpillar dealer for details.
Boom Chain Tension -Check/
Adjust
SLE1-Up
You must read the warnings and instructions
which are contained in the safety section of this
manual. Before you perform any operation or
maintenance procedures ensure you understand the
warnings and instructions.
Check Condition
1. Park the machine on level ground. Fully retract the
boom and lower the boom.
2. Remove the cover from the rear of the chassis.
3. A limited inspection of the chains can be made
through the rear of the boom. The boom extension
chain can be inspected by fully extending the
boom and looking on top of the intermediate
section. If the chains are corroded, the chains
must be removed from the boom for cleaning and a
full inspection. If the chains require lubricant, the
chains must be removed from the boom for
cleaning and a full inspection. Refer to the
Hydraulic System Systems Operation, Testing and
Adjusting, "Boom Chain - Clean/Inspect/Lubricate"
or consult your Caterpillar dealer.
4. Install the cover on the rear of the boom.
Check and Adjust the Chain Tension
1. Slacken the extension chain and the retraction
chain slightly. Raise the boom to the maximum
angle and retract the boom. This ensures that all
sections of the boom are fully retracted. If the
retraction chain requires adjustment and the boom is
retracted in a lowered position, all the sections will
not fully retract.
The boom can fall if a control is moved or if a hydraulic
component fails. This can cause personal injury or
death. Support the boom with stands. Do not rely on the
cylinder to hold the boom up.
Illustration 179 g00836123
2. Lower the boom to the horizontal position and
install a suitable stand under the first section in
order to prevent the boom from falling
unexpectedly. To properly support the boom, use the
following tools:
Table 18
3. Lower the boom to a position just above the stand
and stop the engine.
Required Tools
Part Number Description Quantity
8S-7641 Tube 1
4C-6486 Stand 1
8S-7615 Pin 1
8S-7625 Collar 1
8S-8048 Saddle 1