1 In case the machine stops while it is working, the discharge gate should be opened to clear off all materials prior to restarting the motor;

2 If material leakage occurs at the discharge gate, it is necessary to check the contacting condition of the discharge gate with the housing. If the discharge gate cannot be closed tightly, loosen the nuts on both ends of the connecting lever firstly, and then adjust the length of the connecting lever to a proper position; if it is caused by an aged seal strip, the seal strip should be replaced;

3 When the discharge gate is closed with no signal given out, that means the limit switch is at incorrect position or the circuit is broken, so the position of the limit switch should be adjusted and checks should be made on the circuit;

4 If the discharge mechanism cannot work normally, it is necessary to check the cylinder and air supply system for any failure, and check the pipe connection for its conformity to the requirements;

5 If material leakage at shaft ends during operation is caused by the loose bolts on the sealing cover, it is necessary to screw them up tightly; if it is caused by aged sealing members, it is necessary to replace them timely. If there is not enough space for replacing the sealing members, the sprocket and bearing pedestal should be disassembled firstly, then the sealing gland, finally the sealing members should be replaced

6 If light friction noise occurs during the operation of the machine, the position of rotors can be properly readjusted, and the paddles can be ground if necessary.