You shoud have a manual crank capability. It may be on opposite side of the unit. If you have a small door on the slide that could be your crank access..On lippet frames most are at frame level. If the trailer is not level that could cause binding. This would be for a pinion and gear slide, if you have a Swintek there is a different process. Not being familiar with your particular unit I donnot know what you have. Good Luck Im sure others will respond.
Al Laura (Lily & Breeze Portie Girls)
2011 F250 6.7 PS Tuxedo Black 4x4
11 305SKP- TPMS- RideRite air bags
Reese 16K Slider Wet Bolts