ENGINE AR 7E6635 - Caterpillar

Procedure To Increase The Auxiliary Valve Flow Rate
In all of the following flow rates, it is important to have the margin pressure set at the high end of the specification to obtain the maximum flow out of the valve. See the appropriate Service Manual for the recommended margin pressure specifications. Also, 129 L/min (34 gpm) is the maximum amount of flow the control valve can physically supply and should be sufficient for any attachment the machine is capable of operating.To acquire a flow rate of approximately 91 L/min (24 gpm), follow Step 1 only. For a flow rate of approximately 114 L/min (30 gpm), follow Steps 1 through 6. To obtain a flow rate of approximately 129 L/min (34 gpm), follow all of the steps listed.
1. Remove the 6V8495 Washer(s) [shim(s)] in the 9T8788 Control Valve Group. See Illustration 1 for the location of the shim(s).
Illustration 1. Location of shim(s). The next several steps will provide a parallel flow path between the auxiliary valve stack and the loader control stack.2. See Illustration 2. Remove 9R4114 Hose Assembly (1), 6V9007 Elbow (5), and 6V9746 Seal (3) [remove from 6V9007 Elbow (5)]. Install a new 6V5184 Plug (not shown) in place of the former elbow.3. Install a new 9R4115 Hose Assembly (2), 6V9839 Tee (4), and two 6V9746 Seals (3). (The two 6V9746 Seals consist of one additional seal and the seal removed from the elbow in the previous step. Install both seals in the 6V9839 Tee).
Illustration 2. Top view of 9R1360 Hydraulic Pump Lines Group. (A) Loader control valve. Large arrow indicates front of machine.4. Remove 6V8629 Elbow (6) and replace it with the 6V9007 Elbow removed from the front of the loader control valve in Step 2. See Illustration 3.5. Remove 5P2211 Adapter (7) and replace it with a 3T4965 Adapter.6. Remove 2M9780 Seal (8) and replace it with a 3D2824 Seal.
Illustration 3. View of 9R1360 Hydraulic Pump Lines Group showing inside of right rear frame rail. Large arrow indicates rear of machine. (B) Loader control valve. (C) Stabilizer and attachment control valve. (D) Backhoe control valve.7. Replace the spool in the auxiliary control valve with a 6E0083 Stick Stem (spool) Assembly (11). Add one 9T0650 Spacer (10) and one 4J7533 Seal (9). See Illustration 4.
Illustration 4. Typical location of the additional parts required in Step 7.