Register free!
Search
 
     

The Green Industry's Resource Center


Click for Weather
Reply
 
Thread Tools Display Modes
  #31  
Old 01-07-2014, 01:22 PM
mxridernorth mxridernorth is offline
LawnSite Senior Member
 
Join Date: Apr 2008
Location: North Saanich
Posts: 292
When the hook begins to lift the bin off the ground, what is the distance between the bin hook and the rear of the truck. To maximize weight lifting capacity this distance should be as minimal as possible and the arc of the bottom front of the bin should just clear the rail/roller as the lift travels through its path.A guess of what the issue is (without seeing more photos) would be that the lift is installed to far to the rear. Can you show some side view photos?

It's a pretty simple statics problem but I would need all relevant dimensions to help you work it out. I'd also need the empty front axle weight.
Reply With Quote
  #32  
Old 01-12-2014, 10:03 PM
ShadyTree's Avatar
ShadyTree ShadyTree is offline
LawnSite Member
 
Join Date: May 2004
Location: East Coast
Posts: 63
Quote:
Originally Posted by zabmasonry View Post
I'm just assuming that the axles are mounted as far back on the frame as possible.

The rotation point on the boom is very far back on that hoist.Additionally the boom seems pretty long for how short that truck is. I don't have any first-hand experience with swap-loaders, but it seems to me that the geometry of the hoist is just weird. Is the boom pin on the hoist at least above or preferably forward of the center point between the axles? assuming that your truck is within their specs, I'm wondering if the hoist on your truck was built for a long Cab-Axle (grunion) and ended up being cut down (from the back) to fit your frame.

I've picked 10 ton with a single axle hook lift (f750) with no problems, definitely felt it unload a bit, but nothing like that. There is definitely something screwy with that.

I'm not going to get out paper tonight and start doing force diagrams, but I'd demand the manufacture gets an engineer involved to figure this out. It's clear that this isn't just a matter of just a funny situation but a clear error at some point. At some point in the design process engineers must of spent a lot of time figuring out how to avoid having this happen.
I totally agree with you about something is wrong with the truck. We have a smaller hooklift and have maxed out the lift capacity on some boxes and the truck still didn't come up in the front. I have been going back and forth with the people that installed it and swap loader. The best answer I got from swap loader was that is normal what is happening to my truck. They suggested a stabilizer after the fact and he won't come and see my truck because he doesn't think anything is wrong with it. I have the people that installed it coming next week so hopefully when they see it in person they can let the rep for swap loader know. I will try and get more images up with some dimensions so you guys can give me your best input.
Reply With Quote
  #33  
Old 01-12-2014, 10:11 PM
ShadyTree's Avatar
ShadyTree ShadyTree is offline
LawnSite Member
 
Join Date: May 2004
Location: East Coast
Posts: 63
Quote:
Originally Posted by mxridernorth View Post
When the hook begins to lift the bin off the ground, what is the distance between the bin hook and the rear of the truck. To maximize weight lifting capacity this distance should be as minimal as possible and the arc of the bottom front of the bin should just clear the rail/roller as the lift travels through its path.A guess of what the issue is (without seeing more photos) would be that the lift is installed to far to the rear. Can you show some side view photos?

It's a pretty simple statics problem but I would need all relevant dimensions to help you work it out. I'd also need the empty front axle weight.
I'll take some pictures tomorrow and also get you some dimensions. How would I get you front axle weight? Would I just put the front wheels on a scale? The front axle is a 20,000lbs with 46,000lbs rears.
Reply With Quote
  #34  
Old 01-12-2014, 10:21 PM
ShadyTree's Avatar
ShadyTree ShadyTree is offline
LawnSite Member
 
Join Date: May 2004
Location: East Coast
Posts: 63
Just found this picture. I had to crop it so I could upload it. Hope this helps give you an idea of the distant between the box and the truck.
Attached Images
 
Reply With Quote
  #35  
Old 01-12-2014, 10:26 PM
ShadyTree's Avatar
ShadyTree ShadyTree is offline
LawnSite Member
 
Join Date: May 2004
Location: East Coast
Posts: 63
This was the amount of dirt I had in the box when I shot that video.
Attached Images
 
Reply With Quote
  #36  
Old 01-12-2014, 11:16 PM
AEL's Avatar
AEL AEL is offline
LawnSite Bronze Member
 
Join Date: Oct 2009
Posts: 1,590
If your truck can't even lift that box off the ground without the front wheels coming up , that is a serious issue and it makes the truck pretty much useless. Sorry I can't help more as I am not too familiar with hook lifts but I am with roll offs. Who ever manufactured and installed the hook lift should have known better and explained to you the possible issues with a shorter frame etc. best of luck and keep us posted.
Posted via Mobile Device
Reply With Quote
  #37  
Old 01-13-2014, 02:09 AM
mxridernorth mxridernorth is offline
LawnSite Senior Member
 
Join Date: Apr 2008
Location: North Saanich
Posts: 292
I don't have any personal experience with hooklifts either but I can see why people with single axles have an easier time lifting loads. The center of rotation is between the rear axles on a tandem vs the rear axle on a single axle and in this case that adds 2ft to the equation. What is the wheel base of the truck and what is the empty FA weight. I can scale the dimensions of the rest from the drawing.

Overlaying some lines and arcs onto the side view image (in order to simulate motion) it is apparent that you have two things working against you at the point the bin comes off the ground: the first is the bin weight and the second is the horizontal force as the hook tries to drag the the bin forward. I'm assuming that you are reversing at the same time as you are trying to lift? This will apply an opposite moment (down force at the front). Also, if possible, loading the bin to the rear as much as possible will help too.
Reply With Quote
  #38  
Old 01-13-2014, 05:55 PM
mxridernorth mxridernorth is offline
LawnSite Senior Member
 
Join Date: Apr 2008
Location: North Saanich
Posts: 292
I was comparing your photo to the photo on the swaploader site and the pivot point of your frame does seem to be further back than theirs. The boom rotation pin on theirs is right on the tandem group center whereas on yours it appears back near the front of the rear-most axle? Hard to tell exactly from the perspective of the photo.
Reply With Quote
  #39  
Old 01-13-2014, 08:08 PM
AEL's Avatar
AEL AEL is offline
LawnSite Bronze Member
 
Join Date: Oct 2009
Posts: 1,590
Picture of the roller i promised you
Attached Images
 
__________________
Sean

A.E.L

Excavating, Grading, Demolition, Land Clearing, Custom Grinding Services, Storm water management, Erosion Control.

Check out our new YouTube account!
https://www.youtube.com/channel/UCWI...YEpKMXUcrB1jBw
Reply With Quote
  #40  
Old 01-14-2014, 03:06 PM
NEUSWEDE NEUSWEDE is offline
LawnSite Bronze Member
 
Join Date: Mar 2003
Location: Maine
Posts: 1,131
might be worth sending this guy an email http://www.truckpaper.com/listingsde...x?OHID=4830329 to see if he had the same problem. Seems to be almost the same truck as yours.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump





Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ©1998 - 2012, LawnSite.comô - Moose River Media
All times are GMT -4. The time now is 06:33 AM.

Page generated in 0.08877 seconds with 8 queries