HOSE 9R8798 - Caterpillar

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 Dealer Service Tool Catalog" 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 work tools have been lowered to the ground, and the 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.
To avoid system damage, make sure that the hydraulic pump is properly filled with hydraulic oil before start-up.
Illustration 1 g01254038
Main Control Valve ( M313C, M315C, and M316C) (1) Plug (Bucket shock reducing valve) (2) Plug (Travel shock reducing valve) (3) Plug (Stick shock reducing valve) (4) Plug (Stabilizer/dozer shock reducing valve) (5) Plug (Boom shock reducing valve)
Illustration 2 g01254053
Main Control Valve ( M318C, M318C MH, M322C, and M322C MH) (1) Plug (Bucket shock reducing valve) (2) Plug (Travel shock reducing valve) (3) Plug (Stick shock reducing valve) (4) Plug (Stabilizer/dozer shock reducing valve) (5) Plug (Boom shock reducing valve)
Engage the swing lock pin.
Adjust the engine speed to LOW IDLE by turning the engine speed dial to position 1.
Start the engine.
Purge one control valve at a time. For each circuit, loosen the plug for the appropriate shock reducing valve.Note: Apply the service brakes when the air is being removed from the travel control valve.
Slowly operate the joysticks for the circuit that is being purged without fully extending the cylinders or without operating at full speed.
When no air is flowing from the control valve, tighten the plug for the appropriate shock reducing valve to the specified torque.
Repeat Steps 1 through 6 for each circuit.