Happijac lubrication
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Forum Discussion
Interesting series of recent posts re: jack leg alignment and jack extension/retraction speed. A couple thoughts:
- Think of the jacks as four posts connected to the corners of a box. Now extend two of the rear posts (jacks). The two front posts (jacks) are going to tilt in parallel with the rear jacks and cause a crabbing action at the feet, both front and rear because, as the box tilts, the horizontal distance from foot to foot / front to back is increasing as the rear of the box raises.
- It seems to me that, by design, the jacks will all operate at different speeds no matter what we do to lubricate the screws and legs. The reason is variation in the voltage drop in the dinky wires that go to the jacks. So, when you couple variations in voltage to each of the jacks and the likelihood that they are operating with different friction, I think the jacks will always be out of sync and operate at different speeds.
Bottom line: the jacks will always crab, no way around it except to try to raise the entire camper (box) upward small amounts at a time to reduce the tilt. And, the jacks will always operate at different speeds, thus supporting the camper with different loading on each of the jacks. When loading I stop periodically to listen to the "groan" of each jack as I test it to see if the apparent loading is about equal, and adjust them accordingly.
Any way... that's my thinking on HJ operation... and I could be wrong.
- Think of the jacks as four posts connected to the corners of a box. Now extend two of the rear posts (jacks). The two front posts (jacks) are going to tilt in parallel with the rear jacks and cause a crabbing action at the feet, both front and rear because, as the box tilts, the horizontal distance from foot to foot / front to back is increasing as the rear of the box raises.
- It seems to me that, by design, the jacks will all operate at different speeds no matter what we do to lubricate the screws and legs. The reason is variation in the voltage drop in the dinky wires that go to the jacks. So, when you couple variations in voltage to each of the jacks and the likelihood that they are operating with different friction, I think the jacks will always be out of sync and operate at different speeds.
Bottom line: the jacks will always crab, no way around it except to try to raise the entire camper (box) upward small amounts at a time to reduce the tilt. And, the jacks will always operate at different speeds, thus supporting the camper with different loading on each of the jacks. When loading I stop periodically to listen to the "groan" of each jack as I test it to see if the apparent loading is about equal, and adjust them accordingly.
Any way... that's my thinking on HJ operation... and I could be wrong.
