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maddox
Joined: 21 Dec 2006
Posts: 786
Location: Belgium
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I'm a certified d'Hollandia mechanic. Specialised in tailgates and lorry loading hatches. (not that I do that for a living ATM)
A tailgate hydraulic group is very compact, but has several disadvantages.
-It uses an alternative valve setup, were you need 3 commands to lift the tailgate and 2 to lower it. You would have to strip the valve setup completely and buy new valves.
-Uses a series wound motor, that gets fed by a big heavy lorry battery, the fuses there are in the range of 300 amps. Anyone batteries to deliver 300-400 amps. Also, series wound motors are rather inefficient. At best 60% will go in mechanical energy, the rest in heat.
- Are set in the pressure range of about 2000 psi. This means the motor pump combination is ment for this pressure. Increase the PRV setting, and your setup will draw even more amps.
- Are not ment to be light, they are a part of a lorry or a truck, who cares about 20 kg extra on the hydraulics when the loading hatch supports are into 100's of kilo's.
- No upside down running ,with the original tank.
But those units are cheap second hand, and they come with all included.
But with a bit of bad luck you have a knackered one, burnt motor, pump dead because run without oil. Very sparky worn solenoids/relais . Handlever valves.
Have fun.
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Mon Jan 08, 2007 7:39 pm |
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