STEERING CONTROL GROUP 7K2945 - Caterpillar

DO NOT ATTEMPT TO DISCONNECT LINES OR REMOVE PLUGS IN THE CUSHION HITCH CIRCUIT UNTIL THE ENGINE HAS BEEN SHUT OFF AT LEAST FIVE MINUTES. The five minute wait permits oil pressure in the accumulators to be relieved. The hissing sound can be heard at the selector lever while the system is being bled. If the engine is shut off when the machine is in cushion ride, the hitch will lower as the circuit is bled. DO NOT PLACE HANDS OR FEET AROUND HITCH COMPONENTS UNTIL THE HITCH IS COMPLETELY LOWERED. Failure to heed this warning can result in the sudden release of high pressure oil.
1. Remove only the cap from the nitrogen fill valve (1) and install the chuck, hose, gauge and valve from tool (A).2. Open the valves and relieve the cylinder of nitrogen.3. Disconnect the hydraulic lines at the base of the accumulator. 4. Attach hoist and remove accumulator bolts (2) and (3).5. Remove accumulator-weight 378 lbs. (171 kg).Install Accumulator
1. Mount accumulator on machine.2. Connect hydraulic lines.3. Connect nitrogen charging group, tool (A) and charge accumulator as outlined in TESTING AND ADJUSTING Section.Disassemble Accumulator
preparatory step: a) remove accumulator1. Open valve and relieve accumulator of all nitrogen.
Open valve carefully. Don't let the entire valve unscrew from manifold.
2. Remove manifold and tube assembly (2).3. Remove cover (1).4. Remove head (3).5. Remove piston (4). Use 3/8" - 16NC forged eyebolt if necessary.Assemble Accumulator
1. Thoroughly lubricate inside wall of accumulator. 2. Use tool (B) to install seals on piston.3. Install piston and push it to bottom of cylinder.4. Install cylinder head.5. Install manifold and tube.6. Install cover. 7. Use tool (A) to precharge cylinder to 400 PSI (28,1 kg/cm2).8. Fill cylinder with oil.concluding step: a) install accumulator