How to prevent wear and deformation pu castor?

Please don't use hammer force and brake pads, should be properly push press brake pads [ ON separate /] Part, loosen the brake. Please don't last long in the trailer, traction operation. Please don't put pu castor stationary on the sloping ground. Heavy duty castor wheel diameter is larger, the wheel diameter, the greater the push more effort, and better able to protect the ground, because the stress area is larger, and larger casters in slow-moving situation is not easy to hot deformation, but also will be more durable, is still under conditions allowing choice diameter is larger heavy-duty casters is better as soon as possible. / news_156。