Service Repair Manual
345B and 345B L Excavator
Care must be taken to ensure that fluids are contained during
performance of inspection, maintenance, testing, adjusting and repair
of the product. Be prepared to collect the fluid with suitable containers
before opening any compartment or disassembling any component
Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop
Products Guide" for tools and supplies suitable to collect and contain
fluids on Caterpillar products.
Dispose of all fluids according to local regulations and mandates.
Failure to properly assemble parts or failure to follow established
procedures can lead to damage to the parts and assembly.
To avoid damage to parts, always identify and mark the parts so that
they can be installed into the same location. Never force parts during
assembly. Keep parts clean and lubricated.
Keep all parts clean from contaminants.
Contamination of the hydraulic system with foreign material will
reduce the service life of the hydraulic system components.
To prevent contaminants from entering the hydraulic system, always
plug or cap the lines, fittings, or hoses as they are disconnected. Cover
any disassembled components and clean them properly before
Clean the hydraulic system properly after any major component
exchange or especially after a component failure, to remove any
Note: If a failure occurs, an accurate diagnosis of the cause can prevent a recurrence. Information is available to
analyze failures for piston pumps and motors. Refer to Special Publication, SEBD0641, "Analyzing Axial Piston
Pump and Motor Failures".
Note: Inspect all parts. If any parts are worn or damaged use new parts for replacement. The installation of used
parts during reconditioning is acceptable. Reuse and salvage information is available on piston pumps. Refer to
Guideline for Reusable Parts and Salvage Operations, SEBF8032, "Piston Pumps and