CROSS-PIPE 1081128 - Caterpillar

At operating temperature, the hydraulic oil tank is hot and under pressure. Hot oil can cause burns. Remove the breather filter cap only when the engine is stopped an the breather filter cap is cool enough to touch. Slowly loosen the breather filter cap to release any pressure in the hydraulic tank. Be cautious of hot hydraulic oil when any lines are disconnected in the hydraulic system.
1. Drain hydraulic tank. The hydraulic tank contains 125 liters (33 U.S. Gal).2. Remove side panel attached to hydraulic tank. 3. Remove and plug three hydraulic lines (3) from valve manifold (1). Remove three other hydraulic lines (2). 4. Remove and plug seven hydraulic lines (4) from valve manifold (1). 5. Remove and plug five hydraulic lines (6), and one tube (5) from the valve manifold. 6. Attach tooling (A) to the valve manifold as shown. Remove one hose (7). Remove four nuts (8) and remove manifold (1). Install in reverse order7. Refill hydraulic tank. Insure that tank is at proper level if any fluid was lost during draining.Disassemble And Assemble Hydraulic Tank Return Valve
Start By:a. remove hydraulic tank return valve 1. Remove hydraulic line (1). There is a slight amount of spring pressure under the half flanges (2). Remove the bolts evenly and slowly.2. Remove four bolts and two half flanges (2). 3. Remove flange (5), remove O-ring (4) and remove spring (3). 4. Remove bushing (8), O-ring (7) and piston (6). There is a slight amount of spring pressure under the filter (10). Remove the snap ring slowly.5. Remove snap ring (9) and remove ring (hidden), filter (10), spring (hidden) and pin (hidden).6. Remove other fittings if necessary. Assemble in reverse order.7. Use a press to compress the spring and filter (10) to allow easy installation of snap ring (9).8. Install new O-rings as necessary.End By:a. install hydraulic tank return valve