ATA 32

Proper Nose Landing Gear Strut Servicing Prevents Towing Damage
Air crews and ground personnel are reminded to monitor the service height of your Westwind's nose landing gear. With the crew and passengers out of the aircraft and the nose strut properly services, the upper scissor should be just above the nose wheels.
Although the scissors are disconnected for towing, a low strut will allow the upper scissor to become trapped between the nose tires. If you handle an aircraft in this condition, you can exceed it;s steering limit, resulting in damage to the nose gear components and airframe structure. If you suspect the plane was moved while you were away, look for scuff marks (on the inside of the tires and rims, and on the scissor) that may suggest the aircraft was improperly handled.

ATA 32

If your aircraft decides not to steer the next time you get in it, have your maintenance personnel place a jumper across the terminals on the little silver switch (not the round one with the connector)in the top of the nose wheel well on the steering control valve. If it steers, the switch is bad or out of rig, and you just eliminated a lot of troubleshooting time.