Fully fed hydraulic crawler-type rice combine harvester often fails to hang the table, the neutral position can not stop the failure, the main causes and exclusion methods are as follows: 1. The hydraulic oil is not clean. Replace the clean hydraulic oil, clean the filter and the tank. 2. The amount of hydraulic oil in the tank is insufficient. Add hydraulic oil and add 2/3 or more full tank capacity. 3. Hydraulic tubing leaks. Mainly because the hydraulic pipe is damaged or the hydraulic oil pipe joint is not tightly sealed, it should be promptly replaced or repaired to prevent oil leakage. 4. The hydraulic pump is worn and the seal is not sealed. Repair or replace damaged hydraulic pumps and seals. 5. There is air in the oil circuit. When the oil tank is changed oil or the hydraulic oil is insufficient, the oil enters the air, causing the header to hang up and the air to be removed. Exhaust method: loosen the nuts of the hydraulic pump outlet nut and the nut of the header unloading and lowering cylinder inlet port twice, start the engine, make the hydraulic pump work, observe the oil overflowing from the outlet of the hydraulic pump, if there is no air bubble , Tighten the nut, and then operate the lifting handle to lift the header, and when the header is raised and lowered to the maximum and minimum limit positions, the hydraulic oil overflowing from the oil inlet nut is not tightened. Note that when tightening the nut, the engine should be shut down to ensure personnel safety. 6. The cylinder or seal is worn out. Inspect cylinders and oil seals for wear damage, replace or repair. 7. The safety valve (relief valve) does not work properly. After a period of use, the safety valve is closed tightly, and the pressure spring is deformed. The pressure of the hydraulic oil is reduced, causing the header to hang up or lifting slowly. At this time, adjustments need to be made. After the engine is started, the engine is allowed to run at an intermediate speed, the hang-down handle is placed in the raised position, the safety valve lock nut is loosened, and the adjustment bolt is loosened, so that the header is completely lowered. At the lowest position, slowly re-insert the adjusting bolt until the header can be lifted smoothly. At this time, the pressure adjusted in the hydraulic system is the optimal pressure. If the pressure is too high, it will cause the oil to heat, the gear oil pump will be damaged due to the overload, if the pressure is too low, the header will not hang smoothly. After adjustment, tighten the lock nut.
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