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Part 1
The day after Christmas 2022, we went to the storage shed to hook up our trailer. The temperatures had been between -10F and -20F the entire week prior. The tongue jack just barely was able to do the job, grinding along at an extremely slow rate, despite a lithium battery that was kept warm at home. As the grease began to warm slightly from all the shear energy being put into it, it started to run a bit faster. I was not able to manually turn the jack screw in any meaningful amount.
I recently took it apart and replaced the gearbox grease with Dow Corning 33 Lightweight grease, which has a very wide temperature range. I did not know if it was the gearbox or the actual jack screw, but I suspected the gear box, since things are moving much faster there.
I removed the three screws which attach the unit to the tongue, noting that one of the screws was extremely difficult to back out. I suspected it was galled or something.
First I removed the top cover. I removed the rubber cap over the manual actuation hex, removed the two screws in there as well as 4 screws coming in from the bottom. Remove also the screw holding the ground wire to the gearbox. Remove the large manual drive hex, I believe there was one set screw. There are 5 screws holding the housing bottom to the gearbox, which are accessed through the slots in the gearbox cover. The lower housing can then be slid down a bit out of the way. Then remove the two bolts holding the gearbox housing to the jackscrew tube. The tube can then be slid out of the gearbox housing.
The day after Christmas 2022, we went to the storage shed to hook up our trailer. The temperatures had been between -10F and -20F the entire week prior. The tongue jack just barely was able to do the job, grinding along at an extremely slow rate, despite a lithium battery that was kept warm at home. As the grease began to warm slightly from all the shear energy being put into it, it started to run a bit faster. I was not able to manually turn the jack screw in any meaningful amount.
I recently took it apart and replaced the gearbox grease with Dow Corning 33 Lightweight grease, which has a very wide temperature range. I did not know if it was the gearbox or the actual jack screw, but I suspected the gear box, since things are moving much faster there.
I removed the three screws which attach the unit to the tongue, noting that one of the screws was extremely difficult to back out. I suspected it was galled or something.
First I removed the top cover. I removed the rubber cap over the manual actuation hex, removed the two screws in there as well as 4 screws coming in from the bottom. Remove also the screw holding the ground wire to the gearbox. Remove the large manual drive hex, I believe there was one set screw. There are 5 screws holding the housing bottom to the gearbox, which are accessed through the slots in the gearbox cover. The lower housing can then be slid down a bit out of the way. Then remove the two bolts holding the gearbox housing to the jackscrew tube. The tube can then be slid out of the gearbox housing.
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