308C CR Excavator Hydraulic System – Accumulator (Hydraulic Pilot) – Remove and Install

Removal Procedure


NOTICE
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 containing fluids. 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.

NOTICE

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 containing fluids.

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.

Personal injury can result from hydraulic oil pressure and hot oil.

Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system.

Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.

Release the hydraulic system pressure. Refer to Disassembly and Assembly, “Hydraulic System Pressure – Release”.




Illustration 1	g00889074
Bottom guard (1) is located on the rear side of the swing gear.

Remove bottom guard (1) in order to gain access to the accumulator.




Illustration 2	g00888344
The above graphic is taken from the underside of the machine.

Loosen nut (3) and remove accumulator (2) .

Installation Procedure

Table 1
Required Tools
Tool	Part Number	Part Description	Qty
A	7S-5437	Nitrogen Charging Group	1

Note: Check the O-ring seal. If the O-ring seal is damaged or worn, use a new part for replacement.


NOTICE
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 containing fluids. 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.

NOTICE

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.




Illustration 3	g00888344
The above graphic is taken from the underside of the machine.

Position accumulator (2) for installation and tighten nut (3) .

Use Tooling (A) to charge the hydraulic accumulator.
Note: Refer to Tool Operating Manual, NEHS0598, ” 9U-6740 Accumulator Charging Group Tool Operating Manual” for information on charging the accumulator.




Illustration 4	g00889074
Bottom guard (1) is located on the rear side of the swing gear.

Install bottom guard (1) .

Check the oil level in the hydraulic oil tank. Add hydraulic oil, if necessary. Refer to Operation and Maintenance Manual, SEBU7421, “Hydraulic System Oil Level – Check” for the correct procedure.