Why does the hydraulic oil turn black after the excavator uses hydraulic breaker

Causes of black oil

The black oil in the hydraulic system of an excavator with a hydraulic breaker is not only caused by dust and the quality of the oil seal, but also caused by irregular butter filling.

For example: when the distance between the bushing and the steel drill is more than 8mm (the little finger can be inserted), it is recommended to replace the bushing. On average, one upper bushing needs to be replaced for every 2 lower bushes replaced.

When replacing hydraulic accessories such as oil pipes, steel pipes, oil return filters, etc., you need to clean up the dust or debris at the interface before they can be loosened and replaced.

When filling butter, the hydraulic breaker needs to be lifted, and the steel brazed into the piston, only half of the standard grease gun is required for each filling.

Because if the steel drill is not pressed tightly when filling the butter, the butter added at this time will be at the upper limit of the steel drill groove. When the steel drill is working, the butter will directly jump to the main oil seal of the breaker, following the piston The reciprocating movement brings the butter into the cylinder of the breaker, and then mixes the hydraulic oil in the cylinder of the hydraulic breaker into the hydraulic system of the excavator, causing the hydraulic oil to deteriorate and turn black.

Approach

1. Use the butter posture correctly.

2. Install oil return filter device.

3. Install water spray device to reduce external dust.

4. The upper and lower bushes are worn too much, so replace the bushes in due course.

5. If the air intake check valve is broken or blocked, check the check valve regularly.

6. Replace the dust seal in time.

7. Use the hydraulic breaker correctly (don't hit it often).

8. Pay attention to whether the size of the steel drill matches the bushing.