Pneumatic diaphragm pump can't start or slow-moving processing method

pneumatic diaphragm water pump can't start or slow-moving solution: 1, check the filter, the pressure regulating lubrication devices, inlet filter is clogged. 2, check whether the valve is stuck of impurities. Please remove the valve and clean. Within the check valve piston with and without scratches. If the piston surface light instead of black and pure, piston and o-ring wear after the need to change. Scars. The piston surface light, but not black, not pure, piston and o-ring wear need to be replaced. Please replace the new product. 3, check the spindle and o-ring for scratch, abrasion and squashed. If there are any damage, please change.