haulin-gas
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Everything posted by haulin-gas
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Well, it's heading into the frame shop in the morning. Hopefully they'll finally find out what's wrong with this thing once and for all!
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Thanks to everybody for your ideas. At this time they are no closer to finding a cure, or the cause for that matter. I have been assured that the engineers at Mack are working on the problem, but they are being very tight lipped about the whole thing. Wouldn't want word of this getting out to the FMVSS or Transport Canada, eh! Makes me feel a whole lot better knowing that after I lose control and roll it that the engineers have got my back!
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Interesting point. I just did my weekly crawl thru and noticed that the crossmember just behind the transmission is showing signs of rust between where the gussets are riveted to the crossmember. Can't turn the rivets with a vise-grip, but they could be tight and just wandering around in slightly oversize holes. Along with all the other issues on this p.o.s. I think it's time to have a little discussion with the dealer. Best place for this truck is parked against their fence, far away from a public road!
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CHU, MP8-505C, T318LR, S40's @3.98 with 24.5 rubber. Speced by Mack for pulling 140,000# up to 8% grades. Top end power is ok, but it's the 1760 torque that causes the lack of bottom end holding power. Our company trucks have 550 Cummaparts with 2050 torque. Top 4 gears I can keep ahead of them but below that they're around me and gone.
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This one was the pull truck so that wasn't the cause. My last Pete came up piggy backed and they had to replace the front springs. It had the air ride steer axle in it and the rear sections behind the air bags were both snapped off when the set her on the ground.
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So, is it possible to switch from a TRW box to a Sheppard without any modifications? One thing we have noticed on this P.O.S. is that the left steer axle spring is somewhat sagged compared to the right, and has been since I took delivery. Any thoughts as to this affecting the wandering issue? Mack parts guy says there are 2 different springs that are used in the CHU. On has a higher load rateing than the other and he thinks it may be possible that the factory screwed up and mismatched the springs on the assembly line.
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Beginning to wonder if there's an issue with the steering boxes. Two of us have had the boxes changed before 50k miles and within that time they both needed to have the sector shaft play adjusted. Before they changed my original steering box, it went from nice and snug to over 1/4 turn of free play in the steering wheel, followed by the shaft seal letting go. Did TRW start assembling their boxes in a 3rd world country lately?
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Great to hear, well you know what I mean. These clowns up here seem to think I'm the only one having a problem. Put 2 trailers loaded with 50,000 litres of sloshing diesel fuel behind you and head up the Alaska Highway every week and see if you won't be pulling leather out of your butt cheeks at the end of every day!
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Thanks for the info. Just talked to the service manager, since mine is in the dealership with the tranny out for the second time in 3 weeks, and he asked me how the hell I found out about the bushings since they only heard about it this week. Too funny.
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wheeler73, these are the "after alignment" readings. And yes, the suspension check has been done as per the bullitin on the twin Y
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wheeler73, these are the readings from the last alignment check. Steer axle- Left side Camber= -0.3 deg Caster=3.8 deg Toe= 0.03 deg Right side Camber= +0.3 deg Caster=4.6 deg Toe=0.04 deg
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As I mentioned earlier, the alignment has been checked twice by 2 different reputable shops.
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wheeler73, if you mean dampening cylinder kit, one of the guys I mentioned has had that installed at the dealership and it didn't make any difference at all.
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Drives line up perfect. Thrust angles are dead on. It's got the new Twin Y suspension on the back and Mack 14200 steer axle. I know of 2 other owners of the same model having the same problem. One has Hendrickson and the other has NeWay suspension.
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Loaded, empty, bobtailing seems to be no difference. Tried 5th wheel in various positions and it makes no difference. Steer axle weighs 5400-5600 kgs (11900-12300#) all the time, depending on fuel level.
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I'm the very disappointed owner of a 2014 CHU that wanders all over the road like a coyote chasing gophers from ditch to ditch. Have had alignment checked twice at 2 different shops and they both say it's good. Steering box has been replaced under warranty and it didn't help at all. Got rid of the factory Bridgestone steer tires and replaced with Michelins which improved it slightly, but still darts side to side at the slightest rut or twist in the road. Oh yeah, forgot to mention it only has 80,000km on it. Anybody have any ideas, cause the dealership sure don't?
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It's a Dogs life.
Images added to a gallery album owned by haulin-gas in BMT Member's Gallery - Click here to view our member's albums!
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IMG 20140423 00163
haulin-gas posted a gallery image in BMT Member's Gallery - Click here to view our member's albums!
From the album: It's a Dogs life.
Sled Dog having a tough day.
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