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Old 06-30-2004, 01:13 PM   #1 (permalink)
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Who drives a Lull(skytrak)?

I noticed today that they have a hydro cylinder hooked to their centerpinn articulating planitary axles. But I thought I saw one freely articulating. Was wondering if their is a bypass valve or if it is setup as some kind of shock? Or if maybe that one just was messed up.
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Old 06-30-2004, 01:56 PM   #2 (permalink)
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The ones I've seen, one axle is forced (hydro cylinder) and the other is free.
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Old 06-30-2004, 02:07 PM   #3 (permalink)
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That may be what it was. The CAT definitely had two cylinders and the rear one had some kind of control box mounted directly on the rear cylinder. But maybe the skytrak I saw hop the curb only had a front cylinder. Guess theres no Vodo Magic afterall. Can anyone confirm?
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Old 06-30-2004, 05:20 PM   #4 (permalink)
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Confirmed

No voodoo.
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Old 06-30-2004, 08:53 PM   #5 (permalink)
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lifts that you see with a cylinder on the front and rear have whats called Oscillation lock when the boom goes up so far it locks the rear axle from oscillating when the boom is down the rear is free lifts with only a cylinder on the front the rear is always free

you can (in certian circumstances) use the frame tilt and a chain to force the machine to lift a tire in mid air in the case of a broken axle

and on older lulls if you had the right combo of problems you could step on the brake pedal and it would lift a front tire ~3 feet in the air and when you let off the padal the machine would fall quite quickly causing most operator to shit themselvs

what more would you like to know?
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Old 07-01-2004, 12:57 PM   #6 (permalink)
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Why would the tire lift if you stepped on the brake?
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Old 07-01-2004, 04:25 PM   #7 (permalink)
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when you step on the brake it locks the rear axle for safety when a specific valve sticks it causes pressure to be fed to the frame level cylinders
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