For this phenomenon, the appearance of the tensile testing machine can be checked first, such as whether the oil pipe joint leaks oil, whether there is any sand hole crack in the oil pipe, whether there is oil leakage in the oil delivery valve, oil return valve, oil cylinder, etc., and then further inspection .
(1) If the handle of the oil return valve is tightened, the oil drain still flows out of the drain pipe, indicating that the oil return valve is not closed tightly, and the oil needle and the valve body are not well sealed.
Remedy: Unscrew the oil needle nut for one week, tighten the needle handle inward, then use one wrench to screw the nut sleeve inward while the other hand twists the needle handle inward and then release. Nut sleeve, return the needle handle for two weeks, and then tighten the nut sleeve. Reloading generally solves the problem. If there is still oil flowing out, the oil needle and the nut sleeve may be different, and the nut sleeve may be replaced to eliminate the problem of disagreement.
(2) If the handle of the delivery valve has been unscrewed and the overflow pipe still has a large amount of oil overflow, the load cannot be increased. The main reasons are:
1 The damping gap between the damper rod (oil needle) and the valve body is too small, and the pressure compensation for the rear chamber of the piston is insufficient. After the piston moves backward, the oil pumped from the oil pump flows directly back to the oil tank through the overflow valve.
Remedy: Replace the damper rod (oil needle) or the flat surface of the damper rod (oil needle) to expand the damping gap.
2 There are solid particulate contaminants on the surface of the piston and the piston sleeve. When the piston moves, it is equivalent to the action of the grinding sand. After the abrasive wear occurs, the stuck or moving is not smooth, so that the overflow opening is normally open. '
Remedy: Remove the fixed wire behind the oil delivery valve, remove the piston and the piston sleeve and polish it with abrasive rod and abrasive.
(3) If the drain pipe of the working cylinder of the main engine has a large amount of oil leaking out, the test machine cannot be loaded, the main reasons are:
1 The viscosity of the oil is low.
Remedy: Replace the lubricant with a higher viscosity.
2 The cylinder and piston clearance is too large.
Remedy: Train or replace the piston.
(4) If the oil supply valve, oil return valve and working piston are not found after inspection, consider whether the oil pump has high pressure oil output.
Inspection method: Close the oil return valve and open the oil supply valve. If the overflow pipe on the oil supply valve has no oil flowing out, it can be judged that the problem is on the oil pump and the oil pump is disassembled and inspected. The main causes of oil pump failure are:
1 The return spring fails or breaks, so that the oil is insufficient when the piston is sucking or the piston is not working, and the oil discharge is naturally insufficient.
Remedy: Replace the spring.
2 The oil inlet steel ball and the oil discharge valve steel ball fail. The reason is that the impurities mixed in the oil stay in the one-way valve seat, so that the valve cannot be closed.
Remedy: http:// Remove the hollow nut in front of the valve seat, take out the valve seat and clean it. If the wear is slight, use a short sleeve as a special mortar and at the end of the mortar. Use a solder to connect a standard new steel ball, and grind the ball valve seat until the contact is fitted and the valve seat is ground. If the seat is severely worn, it is difficult to repair. Before replacing the new seat, the new seat to be installed should be ground and put into the pump body and then grinded with the mortar until it meets the sealing technical requirements.
3 The high pressure oil pipe joint is not tightly sealed by the oil pump. The high pressure oil port of the oil pump is connected with the high pressure oil pipe, the oil collector, the pump body and the aluminum washer with a fixing nut. If the gasket fails, the oil will leak and cause the load to increase. Not on.
Remedy: Remove the high pressure tubing connector and replace the aluminum washer.
4 Because the gap between the plunger and the plunger sleeve is large, or the plunger sleeve is loose, the leaked oil is collected in the oil collector, so that the back pressure inside the pump casing rises, when the back pressure acts on the plunger head and the spring When the restoring force is cancelled, the plunger cannot reset the oil suction, resulting in no oil output.
Remedy: Remove the oil pump for cleaning to replace the total stroke of the plunger or tighten the nut on the plunger sleeve.
(5) The oil volume of the fuel tank is not enough. When the load is applied to a certain load, the overflow pipe of the oil supply valve has the sound of 'å™—' and å™—, and the oil is low and there are bubbles. When the load no longer rises, the overflow pipe No oil flows out.
Remedy: Add lubricant to the tank until the oil level reaches half of the sight glass.
(6) The oil filter network installed on the inner wall of the fuel tank is blocked. After the oil pump is started, the oil pump discharge is insufficient due to the blockage of the oil filter.
Remedy: Use a hose to cover the oil spill valve of the oil supply valve, start the oil pump to pump out the oil in the fuel tank, and close the oil pump. Open the fuel tank drain bolt to drain the remaining oil, then open the lower end cap of the fuel tank, remove the oil filter net and put it in gasoline or diesel to clean it, and wipe the dirt at the bottom of the fuel tank and install it.
(7) The belt that drives the oil pump is loose, and there is a slip phenomenon. When the load is applied to a certain time, the load does not rise, and the oil supply valve overflows without oil.
Remedy: Loosen the motor fixing bolt slightly, screw the tension bolt, and make the tension of the belt moderate by experience, and then tighten the fixing bolt. If the belt is worn or deformed, it should be fully updated.
(8) The oil collector of the oil pump is not pressed on the pump body. When the load is applied to a certain time, the load no longer rises, and the oil supply valve overflows without oil.
Remedy: Tighten the fixing nut at the rear of the oil pump oil collector. If there is still a problem, remove the oil collector and change the “o†ring between the oil collector and the pump body.
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