1) The pressure at three gears is excessively low, the oil temperature is normal, and the loader can not be driven.
A. The transmission pump is severely burnt, the efficiency is excessively low, or the oil level of the transmission is excessively low, and the oil supply quantity is insufficient.
B. The spring of regulating valve fails and loses elasticity. The spring seat is broken off, and the valve stem or the accumulator piston is blocked not to compress the spring, so the system pressure is abnormal.
C. The shutoff valve stem is blocked or the return spring is broken off to cause the shutoff valve to be at the shutoff position for ever.
D. The pressure gage is inaccurate to indicate the pressure readings at all gears of the transmission, so that the users shall check whether the pressure gage is damaged or not if they need to improve the pressure of the transmission.
2） The reverse-gear pressure is excessively low, the first-gear and second-gear pressure is normal, and the oil temperature is normal. What are the causes?
Whether the reverse cylinder of the case body has cracks or not shall be checked. The cracks are generally caused by the excessively high system pressure. The excessively high system pressure is caused by the damage of the pressure gage. The operator does not find damage but arbitrarily increase the pressure to cause the system pressure to exceed the specified value actually.
3) The second-gear pressure is excessively low, the first-gear and reverse-gear pressure is normal, and the oil temperature is normal.
Check whether the rotary oil seal at the matching position of the end cover of the transmission and the second-gear oil cylinder body is damaged or not assembled. Check whether the O-ring of the oil outlet of the second-gear oil duct at the jointing position of the case body and the end cover is damaged or not assembled, and also check whether three piston guide pin of the second-gear oil cylinder body is dropped out to cause the second-gear high pressure chamber to be communicated with the oil sump so that the system pressure is abnormal.