SEAL-O-RING 2769520 - Caterpillar

It is very important the operators DO NOT bypass the implement return oil filter (on "C" Series machines) and return screen (housed in manifold) and return the orbital motor return oil directly to the hydraulic tank.
The following orbital motor return line routing methods allow the operator to bypass the implement return oil around the quick couplers and the hydraulic valves. This method directs the return oil through the implement return oil filter ("C" Series machines) and return screen, before it returns to the hydraulic tank.
Challenger 65 (7YC1-1899)
Chart 1.
Illustration 1 (top view) (A) Elbow. (B) implement oil filter line. (C) connector.1. Drain the hydraulic oil just below elbow (A) located on the left side of the implement hydraulic tank.2. Disconnect implement oil filter line (B).3. Remove elbow (A) from connector (C) and implement hydraulic tank.4. Install tee (1) with seal (2) to connector (C).5. Install reducer (3), seal (4) with cap (5) and seal (6) to tee (1).6. Reconnect implement oil filter line (B) to tee (1).Challenger 65B (7YC1900-Up), Challenger 75 (4CJ1-Up)
Without Implement Oil Cooler:
(A) Elbow. (B) Return manifold. Shown with oil line from oil cooler, without oil cooler will have a cap on elbow (A).1. Drain the hydraulic oil just below top elbow (A) on the top of return manifold (B), located on the left side of the implement hydraulic tank.2. Remove cap from elbow (A) on the top of return manifold (B).3. Install low pressure return line from the implement to elbow (A).With Implement Oil Cooler:
Chart 2.
(A) Elbow. (B) Return manifold. (C) Implement oil cooler line.1. Drain the hydraulic oil just below the return manifold (B), located on the left side of the implement hydraulic tank.2. Disconnect implement oil cooler line (C).3. Remove return manifold (B), elbow (A), and return/drain lines from the return manifold.4. Install tee (1) with seal (2) to return manifold (B) with cap (3) and seal (4).5. Install return manifold (B) to hydraulic tank.6. Reconnect return/drain lines to fittings on manifold (B).7. Install implement oil cooler line.Challenger 65C (2ZJ1-499), Challenger 75C (4KK1-499)
Chart 3.
Illustration 2. (A) Implement filter return line. (B) Connector. (1) Tee (swivel). (2) Cap. (3) Seal. (4) Elbow (swivel).1. Disconnect implement filter return line (A) from connector (B) on valve stack end cover. If machine has an attachment PTO, do the following: Install elbow (swivel) (4) to connector at implement return port, before installation of tee (swivel) (1).2. Install tee (swivel) (1) to connector (B) at implement return port