Service Repair Manual
320C U and 320C LU Excavator
Model: 320C EXCAVATOR MAC
Configuration: 320C U & 320C LU Excavators MAC00001-UP (MACHINE) POWERED BY 3066 Engine
Disassembly and Assembly
320C Excavator Machine Systems
Media Number -RENR3826-16
Publication Date -01/11/2014
Date Updated -30/03/2016
Main Hydraulic Pump and Pump Drive Coupling - Remove
SMCS - 5070-011-MV; 5234-011-MV
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
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.
At operating temperature, the hydraulic oil is hot and under pressure.
Hot oils can cause burns.
To prevent possible personal injury, release the pressure in the
implement hydraulic circuit (boom, sti