Haas Alarm: 118 SPINDLE LOW GEAR FAULT – Gearbox did not shift into low gear. During a change to low gear, the spindle is rotated slowly while air pressure is used to move the gears but the low gear sensor was not detected in time. Parameters 67, 70 and 75 can adjust the time-out times for troubleshooting only. Check the air pressure, the solenoid’s circuit breaker CB4, and the spindle drive. In Diagnostics, check the status of discrete inputs Spindle Hi Gear and Spindle Low Gear. One bit should read 0, the other a 1, then the bits should change status when a gear change has completed.