O RING 2987352 - Caterpillar

Crushing Hazard. Ensure that the engine start switch is in the OFF position, and that the parking brake is engaged before entering the articulation area. Failure to do so could result in serious injury or death.
For maximum service life of the machine, make a thorough service inspection when you perform lubrication and maintenance work. Look around the machine and under the machine. Inspect the condition of all major components. Check all grease fittings. Look for the following discrepancies:
loose bolts
trash buildup
oil, coolant, or fuel leaks
broken parts or worn parts
cracks in the framesRemove any trash and any debris. As needed, adjust the tire inflation. Make any necessary repairs. Make sure that all loose connections and all parts are tightened to the specified torques. Replace any missing parts before starting the engine or before operating the machine.Inspect the machine for leaks. If leaks are observed, find the source of the leak and correct the leak. If leaks are suspected, check the fluid levels more frequently than the recommended intervals.
Illustration 1 g06100195
Inspection points for the service inspection
(A) Ground level controls
(B) Front lights
(C) Cooling system
(D) Engine
(E) Hydraulic system
(F) Engine air pre-cleaner
(G) Power train hydraulic system
(H) Steering hydraulic system
(J) Articulating hitch
(K) Rear axle
(L) Frame and body
(M) Fuel tank
(N) Tires
(P) Rollover Protective Structure
Illustration 2 g06100199 (A) Inspect the ground level controls for proper operation. Replace a damaged or worn battery disconnect switch (1). Replace a damaged or worn engine lockout switch (2). (B) Inspect the lights for broken lamps, lenses, and proper operation. Replace broken lamps and lenses. (C) Inspect the cooling system for leaks, worn hoses, and debris. Repair any leaks and damaged hoses. Remove any debris that could block the air flow through the radiator.
Illustration 3 g06100200 (D) Inspect the engine. Use dipstick (3) to check the engine oil level. Check for oil leaks, coolant leaks, and exhaust leaks. Check the belts of the engine for proper tension and for good condition.
Illustration 4 g06100203 (E) Inspect the hydraulic system. Check for leaks, worn hoses, and damaged lines. Repair any leaks, worn hoses, and damaged lines.Check the level in hydraulic tank (4). Make sure that the filler cap is installed. Inspect the tank covers for damaged bolts, loose bolts, or missing bolts. Tighten loose bolts and replace missing bolts. Check the welds and mounting brackets for the hydraulic tank. Inspect the tank for leaks or for damage. If necessary, make repairs.
Illustration 5 g06100216 (F) Check engine air cleaner hood (5) for accumulated debris. If necessary, clean engine air cleaner hood (5).
Illustration 6 g06100206 (G) Inspect the hydraulic system for torque converter and transmission (6). Check for leaks from the torque converter and from the transmission. Check for worn hoses and for damaged lines. Repair any leaks, worn hoses, and damaged lines.
Illustration 7 g06100210 (H) Inspect the steering hydraulic system for leaks, worn hoses, and damaged lines. If necessary repair leaks, worn hoses and damaged lines. Inspect the steering cylinders (7). (J) Inspect the articulating hitch for wear, damage, and loose or missing bolts. Have the necessary repairs made. (K) Inspect the