5230 Excavator Hydraulic System Relief Valve (Main) - Test - If Equipped Caterpillar


Relief Valve (Main) - Test - If Equipped
`

------ WARNING! ------

Hydraulic oil pressure can remain in the hydraulic oil system on this machine after the engine and pump have been stopped. Personal injury can be caused if this pressure is not released before any service is done on the hydraulic systems. To prevent personal injury, refer to the procedure in Testing and Adjusting Manual, "Release of Pressure in the Hydraulic System".

When possible, the bucket must always be lowered to the ground with the cutting edge rotated to the ground before service is started. When it is necessary for the boom to be in the raised position while tests or adjustments are done, be sure that the boom, stick and bucket have correct support.

Be sure the swing parking brakes and the travel parking brakes are on and the brake release lines are disconnected and plugged.

Always move the machine to a location away from the travel of other machines. Be sure that other personnel are not near the machine when the engine is running and tests or adjustments are being made.

----------------------

Note: The main relief valves are considered to be a factory set valve. The main relief valves are set at 4825 ± 350 kPa (700 ± 50 psi).

Prior to checking the main relief valves, check the signal relief valves and the line relief valves.

  1. Operate the engine at high idle (1830 ± 10).

  1. Stall an implement function with the engine at high idle and measure the engine speed.

    1. The main relief valves are correctly functioning if an engine speed of 1785 rpm is obtained.

    1. Proceed to the next step if an engine speed of 1785 is not obtained.



    Illustration 1g00812509

    Location of main relief valves

  1. Replace the main control valves with 6E-4816 Main Control Valve Plug Gp .

  1. Repeat step 2.

    1. Replace the main relief valves if an engine speed of 1785 rpm is obtained.

    1. The problem may be the margin relief valve or some other leak to the hydraulic tank if the engine speed is less than 1785 rpm.

Information System:

5230 Excavator Hydraulic System Control Valve (Front) - Type 2
325C Excavator Machine System Specifications Bucket
305 CR Mini Hydraulic Excavator Boom/Stick/Bucket Combinations
BH27, BH30 and BH30 W Skid Steer Loader Backhoes Swing Cylinder - Remove and Install
5230 Excavator Hydraulic System Control Valve (Front) - Mass Excavator - Type 2
304.5 Mini Hydraulic Excavator Track Adjustment - Adjust
345B, 345B Series II and W345B Series II Excavators Engine and Pump Control Harness and Wire Identification
345B, 345B Series II and W345B Series II Excavators Engine and Pump Control Automatic Travel Speed Change Is Abnormal - Troubleshoot - 4107, 4204, and 4207
345B, 345B Series II and W345B Series II Excavators Engine and Pump Control Travel Alarm Is Abnormal - Troubleshoot - 4108
345B, 345B Series II and W345B Series II Excavators Engine and Pump Control Controllability Is Bad in Boom Priority Mode - Troubleshoot - 4106
345B, 345B Series II and W345B Series II Excavators Engine and Pump Control Pressurization of Hydraulic Tank Is Abnormal - Troubleshoot
345B, 345B Series II and W345B Series II Excavators Engine and Pump Control Engine Speed Dial Does Not Work - Troubleshoot - 420E and 2303
M318 Excavator Hydraulic System Swing Brake Pressure - Test
5130B Excavator Equipment Lowering with Engine Stopped
325C Excavator Machine System Specifications Bucket
312C and 312C L Excavator Air Inlet Heater Starting Aid
312C and 312C L Excavator Lifting Capacities - 312C with a VA Boom
5130B Excavator Lifting the Boom
3456 Engine for Caterpillar Built Machines System Configuration Parameters
315C Excavator Window (Front)
Quick Coupler Wedge Lock(Wheel Loader) Operating Technique Information
325C Excavator Machine System Specifications Bucket
312C and 312C L Excavator Specifications
3456 Engine for Caterpillar Built Machines E039 Low Engine Oil Pressure Derate