single line pull
Submitted: Monday, Feb 20, 2006 at 22:33
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conman
hey readers,
just wondering, should a 9000lb winch be able to pull a 2 tonne truck up a fairly steep
hill (35 degrees) difficult enough to walk up, with a single line pull?
Mine died after 10 metres, dash lights were gone. I take it the batteries are on their last legs.
thanks in advance.
Reply By: Member - Omaroo (NSW) - Monday, Feb 20, 2006 at 23:23
Monday, Feb 20, 2006 at 23:23
con
It also depends on how much of the cable you had wound out. A winch will pull more easily if there are less winds left on the drum (think of it as lower gearing). If you have a nearly full drum it's much harder work for the winch.
Secondly - what sort of battery are you using to run the winch? Lots of people I know have had accessory
places wire their winch (without consultation) to an auxilliary battery in a dual battery setup - only to find that they have specified a deep-cycle which is also used to power the fridge, radio and lights.
Not good. Use a cranking battery. The bigger the better. The newer the better.
Cheers
Chris
AnswerID:
156160
Follow Up By: conman - Monday, Feb 20, 2006 at 23:26
Monday, Feb 20, 2006 at 23:26
yeah Chris it was almost fully wound out only a couple of winds left, Still want to know if a single line pull is easy for a 9000lb winch in this condition. Does everyone else do it easy, or do they pull out a pulley block?
Definitely hooked to a big cranking battery.
FollowupID:
410192
Reply By: traveller2 - Tuesday, Feb 21, 2006 at 08:11
Tuesday, Feb 21, 2006 at 08:11
The 'use' time should be strictly adhered to because modern vehicles with electronic voltage regualtors and high output alternators will once the battery is 'flat' attempt to drive the winch with the alternator.
The alternator cannot sustain full output (or greater) for very long before suffering meltdown.
Most
winches especially low mounts with poor airflow around the motor will only provide a couple of minutes winching before they are too hot to function.
Some
winches fitted with thermal overload switches will still burn out so the thermal switch cannot be relied upon.
Also
winches need regular servicing especially electrical connections should be removed, cleaned and replaced regularly.
AnswerID:
156190
Reply By: desert - Tuesday, Feb 21, 2006 at 08:41
Tuesday, Feb 21, 2006 at 08:41
It's been my experience that No, that form of recovery is asking too much from an electric winch. In all but the most simplest, flat ground pull, always use a block or perhaps two blocks. You will have 9000lb pull only on the bare drum. By the time the first layer has wound on, you are back to about 8200lb, by the third layer it's more like 7000lb and it gets worst. This is also for a winch and battery in 100% tip top condition, and even so you have about 3 minutes of winch pull before the battery cannot maintain current. A 35 degree slope is very steep, a gradient where you should allow the full weight of the vehicle in your mental calculations, in this case 2 tonne. Plus the resistance due to the surface and if it's mud then add another 1 tonne. If you have let the tyres down for traction, this extra load equates to about another half tonne. Add all that up, and 20% for contingencies and you will see you really had a load of around 4000tonne (8800lb) or virtually right on your THEORETICAL limit. But due to the less-than=perfect electrical system, you are pushing the boundarys. I think you found that out anyhow.
AnswerID:
156195
Reply By: Gu_Patrol - Tuesday, Feb 21, 2006 at 08:53
Tuesday, Feb 21, 2006 at 08:53
Once your batteries get below 12volts your winch doesn't work aswell, the solinods need the full 12 volts or above otherwise you start cooking the winch motor, like the others have said, short bursts of winching is best .
I think the winch could use upto 300 amps while winching therefor your 70 amp hour battery won't last long, After the first 2 metres of winching your battery has only 11.9 volts left unless you use an optima battery or simalar.
I reckon the old hydraulic
winches are the only wat to go
AnswerID:
156199