SEAL-OIL 6B2789 - Caterpillar

Be sure the engine has been shutoff for a minimum of five minutes to be sure that the accumulator oil pressure is zero. The accumulator is filled with dry nitrogen. Do not loosen or remove any lines before releasing nitrogen. A valve at the top of the accumulator can be used to release any pressure that is left in the system. Failure to follow the procedures can result in personal injury.
Before working on the accumulator, clear all personnel from around the machine. Failure to do so could result in injury or death. Relieve hydraulic pressure on the front suspension system by attaching the handle assembly to the suspension valve and manually depressing the lever assembly to relieve pressure from the front suspension system.
Start By:a. open the transmission guard coverb. remove accumulator valvec. drain the accumulator
7S5437 Nitrogen Charging Group(1) Pressure gauge.(2) Connection to nitrogen cylinder valve.(3) Regulator assembly.(4) Valve.(5) Pressure gauge.(6) Pressure regulating screw.(7) Valve handle.(8) Chuck.
Parts From The 7S5437 Nitrogen Charging Group(4) Valve.(5) Pressure gauge.(7) Valve handle.(8) Chuck. 1. Remove two bolts (9). Remove guard (10). 2. Remove cap (11) from the valve assembly on accumulator (12).3. Use the 13 800 kPa (2000 psi) gauge (5) to check the nitrogen charge in the accumulator. 4. Install chuck (8) on the valve of the accumulator.5. Turn valve (7) on chuck (8) completely in (clockwise).6. Check the pressure on gauge (5).7. Open valve (4) slowly to bleed the accumulator of dry nitrogen.
Nitrogen is under high pressure. To prevent personal injury follow the procedures carefully. Direct the discharge hose away from all personnel. Discharge nitrogen in a well ventilated area.
8. When pressure gauge (5) reads (0 psi), turn valve (7) on chuck (8) completely out (counterclockwise).9. Close valve (4) and disconnect chuck (8) from the valve assembly on the top of the accumulator. 10. Install cap (11) to the valve assembly on accumulator (12).11. Install tool (A) to the top of the accumulator. 12. Remove two bolts (14) from strap (13). 13. Disconnect swivel tee (15) from accumulator (12).14. Remove four bolts and two half-flanges. Disconnect hose assembly (16). Cap or plug off immediately.15. Remove two bolts (17) (not seen) from the bottom of accumulator. 16. Attach a hoist to tool (A) and remove the accumulator. The accumulator weighs 34 kg (75 lb). The following steps are for the installation of the accumulator. 17. Install tooling (A). Using a hoist, put the accumulator in position. 18. Install two bolts (1) (not seen) to the bottom of accumulator (4).19. Reposition strap (2). Install two bolts (3).20. Install swivel tee (5) to accumulator (4).21. Install hose assembly (6) and two half-flanges and four bolts.22. Remove tooling (A) from the accumulator. 23. Place guard (8) to accumulator (4). Install two bolts (7).End By:a. charge the accumulatorb. install the accumulator valvec. close the transmission guard cover.Accumulator-Front, Disassemble & Assemble
Start By:a. remove accumulator-front 1. Mount the accumulator onto a suitable holding device. Place two bolts into holes on end cap. Place bar (C) between two bolts.