HOSE BK 5417116 - Caterpillar

Adjustment Procedure For Swing Relief Pressure
1. Park machine on flat ground.2. If the machine is equipped with the fine swing function, turn off control switch (A) located on the left console of the cab. See Illustration 1
Illustration 1. Control switch for fine swing function, if equipped.Preparation
At operating temperature, the hydraulic oil tank is hot and under pressure. Hot oil can cause burns. To prevent possible personal injury, release the pressure in the implement circuits (boom, stick and bucket) before any hydraulic lines or components are disconnected or removed.
1. Slowly loosen vent/fill plug (B) on top of the hydraulic tank to release the internal pressure in the hydraulic system. See Illustration 2.
Illustration 2. Vent/fill plug (B) on top of hydraulic tank.2. Disconnect pilot signal hose (C) from connector (D) located on the main control valve. Signal hose (C) carries the signal pressure to the swing drive brake. This location is shown in Illustrations 3, 4, and 5 for machines with the fine swing control attachment and in Illustrations 6, 7, 8, and 9 for machines without fine swing control.
Illustration 3. Pilot signal line for 320 Excavators with fine swing control.
Illustration 4. Pilot signal line for 325 Excavators with fine swing control.
Illustration 5. Pilot signal line for 330 Excavators with fine swing control.
Illustration 6. Pilot signal line for 311, 312 Excavators without fine swing control.
Illustration 7. Pilot signal line for 320 Excavators without fine swing control.
Illustration 8. Pilot signal line for 325 Excavators without fine swing control.
Illustration 9. Pilot signal line for 330 Excavators without fine swing control.3. Install a plug at the opening of connector (D) to prevent pressure leakage during adjustment procedure. Select the part number for the plug to be used for each machine from Chart A. 4. Tighten plug (B) on the hydraulic tank to 35 5 N m (26 4 lb ft).5. Start the engine. Gradually move the swing control lever to see if the parking brake activates. If the machine rides through the brake, inspect for repairs to the swing brake. Check for brake disc wear and/or preload of spring.Adjustment Procedure
Illustration 10. Swing Motor Compartment. (E) Relief valve (right swing). (F) Relief valve (left swing). (G) Locknut. (H) plug.1. Slowly move the swing control lever for a RIGHT swing operation and check the pressure of relief valve (E) at tap (J).
Illustration 11. Pump compartment. (J) Tap (rear pump).2. Return the swing control lever to the NEUTRAL position. Loosen locknut (G) and turn plug (H) until line relief valve pressure at tap (3) reads the pressure range specified in Chart B. Turning plug (H) clockwise increases the pressure and turning plug (H) counterclockwise decreases the pressure. 311 and 312 Excavators do not have an adjustment screw in the swing motor. When the measured pressure is not within specification for 311 and 312, replace the relief valve.3. To adjust the relief pressure for left swing, slowly move the swing control lever to a LEFT swing operation and check the pressure of crossover relief valve