W4-60C excavator brake air system, fitted between the pump and reservoir pump gas control valve door, and its main function is in the red dust and impurities in the separation of compressed air, oil and water, filtered compressed air to prevent the gas cylinder The backflow of compressed air to the air pump, to ensure that the gas pressure is stable within the range of 0.490-0.637MPa, the maximum pressure does not exceed 0.784MPa.
Often use the following failures: 1, adjusting screw, pressure regulating valve body 3, spring seat, spring sleeve 5, sealing plug 6, the regulator diaphragm 7, slide valve 8, the slide valve 9, plug 10, the spring 11, the funnel 12, the exhaust piston 13, the screw 14, the dust cover 15, the safety valve 16, a safety valve body 17 and the adjustment screw 18, the small spring 19, the large spring 20, the spring seat 21, the exhaust valve 22, the card ring 23, the adjustment washer 24, the stem 25, the diaphragm 26, the valve 27, the valve seat 28, a check valve spring 29, the check valve 30, the filter 31, the O-ring seal 32, the cleaner 33, the fixing screw plug 34, the the fixed drain plug 34, the O-ring
1, pressure regulating valve damage due to withered laminated piece leak regulator diaphragm rubber products withstand air pressure frequently repeated stamping repeatedly arched reset action by the gas, water corrosion, it often causes the membrane sheet damage, which is the control valve most prone to failure. Membrane damage from the air pump to the compressed gas through the membrane into the regulator upper, rather than into the gas cylinder, causing the air reservoir pressure does not rise up. The regulator temperature easy to elevated barometer of the braking system is displayed insufficient air pressure, the pressure regulator at the hear the sound of the leak.
2, the control valve housing to rupture the valve housing consists of an upper, middle, and lower parts, respectively, with the screw connection. The casing is made of aluminum, decomposed or combined, if demolition, improper screws method, easy to make the case to rupture. Failure in the demolition, mounted screws, should be on the corner and points repeatedly tighten or loosen the housing final consistent aggregate surface by the force of its population, to prevent damage due to uneven force.
3, filter damage filter mainly used for dust and impurities in the filtered compressed air, to prevent such material from entering the braking system of the excavator. It by the filter 30, the vacuum pad 32 and the fixed plug 33, if used for a long time, without timely maintenance, it is easy to make the filter copper wire breakage, vacuum pad damage. So the maintenance should be carefully maintained, if the damage should be promptly repaired or changed.
Regulator adjustment pressure is too high or too low normal working, gas cylinder gas pressure reaches 0.637MPa regulator the lower part of that relief, so that the gas cylinder air pressure no longer increased. When the gas cylinder pressure is less than 0.49MPa, should no longer be relief. This adjustment of air pressure by adjusting the screw 1 change large the pressing force of the spring 19 (tighten, gas pressure; loosen the reduction in pressure) to achieve, such as adjusting the air pressure is still normal, you can have two situations: First, Pressure has exceeded but failed to exhaust relief. At this point you should consider exhaust piston 12:00 No run blocked, as a result of the piston turning tight O-ring 34, and 10 excellent exhaust piston lower spring, leaving the normal pressure of the gas can not push the piston running, should be uniform grinding cut the the seal outer ring or adjust, replace the spring. If the the regulator internal spring 18 is compressed too tight, thimble 8 is difficult to promote plug 9 axial plug the hole, etc., can make the air pressure can not unloading; the exhaust relief pressure is not yet meet the requirements. This reason one regulator diaphragm leaks, and the second is due to the small spring loose (or broken), or thimble can be pushed at a lower pressure regulator regulator housing holes (see drawings AA view) continue to leak, resulting in system air pressure does not rise up. In this case the first adjustment screw on the valve removed, adjust or replace the small spring, and then adjust the big spring. Pursuing a dream content management system
5, the adjustment of the pressure of the safety valve is not normal as a safety valve is to ensure that the gas cylinder pressure is not more than 0.78MPa. Such as the safety valve when the pressure exceeds 0.78MPa still not relief, will continue to rise in the gas cylinder pressure. This may be a safety valve diaphragm 25 leak excellent cause the safety valve spring 16; if the pressure does not reach the requested pressure relief, the spring weak poor, the preload is not enough, the valve 26 is not sealed with the valve seat 27 cause 's. Should adjust or replace the damaged parts. Content from dedecms
6, the gas cylinder gas after stopping backflow to prevent the gas cylinder gas after stopping backflow, in the control valve equipped with a check valve 29, if the shutdown of the gas cylinder the gas back to the pump, this failure is because more unidirectional The valve spring 28 elastic is too weak or broken and lost, should adjust or replace this spring. The excavator working pressure is maintained in the range of 0.490-0.637MPa maximum pressure must not exceed 0.784MPa, when pressure abnormal pressure regulator and safety valve should be adjusted. Make mechanical adjustments, safety first adjust the order of the safety valve,
The adjustment method is as follows: (1) the regulator loosen the retaining nut on the adjustment screw, then adjust the screw in the end, the lower exhaust valve can not be opened. ② The safety valve pressure in 0.784MPa whether the exhaust from the vent. If the pressure is not normal to be adjusted by increasing or decreasing the gasket 23 to adjust; gasket low air pressure increase, reducing gasket on the contrary, every increase 1mm shims to adjust the air pressure 0.036MPa. ③ the regulator adjustment screw slowly exit until the exhaust valve open until the exhaust, if the air pressure falls 0.637MPa compared with the best. ④ repeatedly rub under excavator brake pedal or deflate the air reservoir should be observed rebound in air pressure (exhaust piston off) whether, if the pick-up pressure is less than between 0.490-0.539MPa 0.490MPa upper exhaust the hole exhaust The small spring pressure should be adjusted. ⑤ repeatedly adjust, test, until compliance.
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