Hi Katie. I have 2004 Scamp
. Purchased it in 2015. The front jack was not completely free in terms of movement. The extent of easy travel was very limited.
To clean: I put blocks under the hitch (and chocked the wheels) in order to allow the jack to be freely rotated. I used gear oil (80-90 w), a half a quart or more, as a rust and dried-out grease cleaner.
If memory serves, i added oil at the top, where the lever axle
enters, and also along the alignment channel between the two tubes. Again, if memory serves, the jack can be place in an upside down position, which makes it really easy to fill the alignment channel with gear oil.
Adding oil a bit at a time, i moved the lever back and forth, as far as it would comfortably go, then I would stop trying to move it and add more oil...over and over again. It likely took four to eight hours over the course of two days to get the jack fully functional, but the slow and steady approach worked.
After everything was able to move freely, i removed as much gear oil as possible and used bearing grease in a grease gun to fill the tube. The jack has worked well since then. I worked the jack and kept adding bearing grease until only clean grease came out.
Prior to starting the whole process, I put heavy cardboard down to catch the oil and grease...it's a messy endeavour. The beauty of the gear oil was the container...it has a conical nozzle that makes it easy to aim and use in a controlled way.
I would rather get older equipment working rather than buy something new. I find manufacturing standards, in most cases, aren't what they used to be.
Best of luck with your trailer! cathy