YOKE 1713941 - Caterpillar

Flow Compensator Spool Adjustment
Adjustments to the flow compensator spool can be made on the machine. If the margin pressure or low pressure standby test indicates an adjustment is needed, follow this procedure:1. Lower all implements and stabilizers to the ground.2. Run the engine at high idle.3. Remove adjusting screw (4) cap. Loosen locknut (5) and turn adjusting screw (4) clockwise to increase the pressure setting and counterclockwise to decrease the setting.4. Adjust low pressure standby to 2200 70 kPa (320 10 psi).5. Repeat the margin pressure test to make sure the pressure setting is 2100 100 kPa (305 15 psi).6. When the pressure is adjusted correctly, stop the engine. Tighten locknut (7) and replace cap.Relief Valves
Make reference to on first page of Testing And Adjusting section.
There is no main line relief valve. The pressure spool of the compensator valve acts as a main line relief. It limits system pressure to 20 700 kPa (3000 psi). This can be checked on the machine without supplemental pump pressure. The boom, head end relief valve, is the only other implement relief that can be checked on the machine without supplemental pump pressure. All other implement relief valves are set above the pump compensator spool setting. These all require supplemental pump pressure to check.
Loader Control Valve Group
(14) Lift rod end. (15) Tilt rod end. (16) Multi-purpose bucket rod end. (17) Tilt head end.Bench Test
1. Lower all implements and stabilizers to the ground.2. Stop the engine and move all the control levers to all positions. This releases system pressure.3. Relieve hydraulic tank pressure.4. Remove the relief valve to be tested.5. Install the relief valve in the 1U5216 Manifold.6. Connect the manifold to the hydraulic test bench.7. Slowly increase pressure. Note the pressure the relief valve opens. Make an adjustment if needed.On Machine Tests
The boom, head end relief valve can be checked on the machine without supplemental pump pressure. Use the procedure that follows:1. Lower all implements and stabilizer to the ground.2. Stop the engine and move all the control levers to all positions. This releases system pressure.3. Relieve tank pressure.4. Install a 0 to 28 000 kPa (0 to 4000 psi) gauge in signal line pressure tap (1).5. Start the engine and run at high idle rpm.6. Warm up the oil.7. Move the boom to the transport position and lock it in place.8. Run the engine at low idle.9. Move the control lever to the DOWN position to initiate a stall.10. See the chart for correct pressure settings and tolerances.All other relief valve tests require a supplemental pump supply.
Backhoe Control Valve Group
(18) Boom head end relief valve. (19) Right swing rod end relief. (20) Bucket head end relief. (21) Stick rod end relief valve. (22) Boom rod end relief valve. (23) Left swing rod end relief. (24) Bucket rod end relief valve. (25) Stick head end relief valve.Use the following procedure to check all implement relief valves except the boom head end.The testing location will change for each relief