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05-17-2008, 04:36 PM
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#21
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1 Rivet Member
1986 29' Sovereign
Spruce Grove
, Alberta
Join Date: Jul 2007
Posts: 12
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I just installed one on my Cummins. The instruction manual has a lot of rules about when to engauge it. It must mot be turned on for reversing, must not be on for engine braking especially exhaust brakes. It must not be turned on below 20mph. It needs special synthetic gear oil not automatic transmission fluid. My unit came with an eletronic controler that idiot proofs all of the above. My Cummins diesel milage is now the same at 120 km/h as it is at 80 km/h without it. That leeds me to believe that fuel consumption has more to do with engine RPM than wind drag.
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05-17-2008, 07:27 PM
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#22
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Rivet Master
1978 31' Excella 500
Venice
, California
Join Date: May 2006
Posts: 1,067
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Volvo and others used a Laycock de Normanville OD which had a cone clutch and planetary gear train activated by two pistons that got their oil pressure from an eccentric driven oil pump on the output shaft of the transmission and were operated with a solenoid valve. They were usually installed with a lockout switch that only allowed the unit to engage in high gear where high RPM generated sufficient oil pressure to ensure engagement and they couldn't be engaged in reverse.
__________________
"Not all who are laundering are washed" say Bill & Heidi
'78 Excella 500,"The Silver Pullit". vacuum over hydraulic disc brakes, center bath, rear twin. '67 Travelall 1200 B 4X4 WBCCI 3737
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05-18-2008, 06:57 AM
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#23
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Rivet Master
1984 28' Funeral Coach
Belleview
, Florida
Join Date: Jun 2005
Posts: 1,635
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Bill gets the prize!! All GearVendor units begin with a Laycock overdrive unit. GV is the North American distributor for Laycock of England.
I'm waiting for my 1986 Suburban to arrive here in SC. I purchased it a little while back for the low cost of a used GV. It has a rebuilt engine and tranny and will be a complete drive train swap into Airstream One.
I've been letting the bus sit since gas prices went through the roof. Hence my absence here.
I'm still looking for a good shop somewhere in the south east as my present wrench does not have a shop we can get the unit into.
__________________
Glen Coombe AIR #8416
1984 28' Funeral Coach
Former Rolling Showroom & PuttLab (now party bus)
"I'm not an expert. But I did sleep in an Airstream last night."
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05-18-2008, 10:31 AM
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#24
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Rivet Master
1986 31' Sovereign
Miami
, Florida
Join Date: Feb 2004
Posts: 3,137
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Personally, I wouldn't let CW address anything more complex than replacing a paper towel holder.
On the road once, temp in the 90's, got desperate when the A/C failed (under warranty)-- too it to CW and they returned it 2 hours later and said it was "fine, $120 bucks, please". Set up camp and A/C never came on. Sweltered all night. Next day got home and took it to local guys and they replaced thermostat (in about 15 minutes) and it has worked great ever since.
No CW for this boy no mo'
mike
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05-18-2008, 10:33 AM
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#25
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2 Rivet Member
1988 34.5' Airstream 345
CUMMING
, GA
Join Date: Jan 2007
Posts: 49
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GEAR VENDOR problems
If i had enough sense to ask CW for the operating manual when they installed I might not have had the problem! Of course if they had had the sense to tell about that little issue...but come to think of it why didn't GV tell the tech at CW about that issue? Go figure. Another question, this one about a braking system for the 345. I have a blue ox luxor braking system which I used with my tracker which has sadly bit the dust so I am going to tow my grand cherokee. I know it's over the airstream limit so have had the hitch beefed up and there are others on the forum who have no problem towing that much. Now that I've learned a bit more I am a little uncomfortable about using a non proportional braking system. Any suggestions?
Many thanks to everyone on the forum who knows way more than I do about wrenching.
Quote:
Originally Posted by hadams
I just installed one on my Cummins. The instruction manual has a lot of rules about when to engauge it. It must mot be turned on for reversing, must not be on for engine braking especially exhaust brakes. It must not be turned on below 20mph. It needs special synthetic gear oil not automatic transmission fluid. My unit came with an eletronic controler that idiot proofs all of the above. My Cummins diesel milage is now the same at 120 km/h as it is at 80 km/h without it. That leeds me to believe that fuel consumption has more to do with engine RPM than wind drag.
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05-18-2008, 12:38 PM
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#26
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Rivet Master
1984 31' Airstream310
Dunsmuir
, California
Join Date: May 2004
Posts: 1,336
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I use the US Gear Unified Tow Brake. I got mine here: Tow Bars, Tow Dollys, BrakeBuddy & Dinghy Braking they seemed to have a pretty good price.
I've put ~30,000 miles on mine and am satisfied.
__________________
If you want others to be happy, practice compassion.
If you want to be happy, practice compassion - The Dalai Lama
1984 310 Limited Motorhome
Courtesy Parking (W/S/E/Wi-Fi) on I-5 in Northern California, 70 miles from Oregon border
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05-19-2008, 05:13 PM
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#27
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2 Rivet Member
1988 34.5' Airstream 345
CUMMING
, GA
Join Date: Jan 2007
Posts: 49
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gear vendor, us gear etc.
I think I will go with that as soon as the GV is sorted out. Seems that the replacement unit keeps kicking out of OD for some reason or another. Something about the signal generator not maintaining a consistent signal.
Anyway, I don't trust my wrenching skill set enough to install the unified brake system properly so will use the blue ox until I get to someone who can install it properly. Anybody know anyone in New Mexico that can do the install?
One other ?. Anyone know the gear ratios on a 345?
Quote:
Originally Posted by guy99
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05-19-2008, 11:26 PM
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#28
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Rivet Master
1984 31' Airstream310
Dunsmuir
, California
Join Date: May 2004
Posts: 1,336
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__________________
If you want others to be happy, practice compassion.
If you want to be happy, practice compassion - The Dalai Lama
1984 310 Limited Motorhome
Courtesy Parking (W/S/E/Wi-Fi) on I-5 in Northern California, 70 miles from Oregon border
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