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Air dryer upgrade
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Supporting Member of Barthmobile.com 10/08
Picture of MWrench
posted
Glad I was sitting down when I got this news! It has been a LONG time since I serviced the air dryer in the air/hydraulic system.

Midland/Haltex no longer makes the dryer type that was used on the Cummins/Holset air system. Further, Midland/Haltex does not make the service kit for the dryer any longer.

After numerous calls and finally contacting Midland/Haltex tech support (very helpful, courteous) I got some dryer numbers that would replace my obsolete dryer. Almost no one stocks those numbers so shipping comes from KC.

$347.00 plus a $90.00 core, plus tax and shipping well over $500.00!

I am in the process of re-designing the system, I have to be careful because the Cummins/Holset air charging system is not straight forward, those prices are nutz! Will post later after all is settled!


Ed
94 30' Breakaway #3864
30-BS-6B side entry
230 Cummins, Allison 6 speed
Spartan chassis
K9DVC
 
Posts: 1959 | Location: Los Gatos, CA | Member Since: 12-08-2005Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 3/11
Picture of Tom  and Julie
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Hmmm, a core charge for an obsolete unit? Something is not right with that. The dryer has no connection to any engine as it is a passive system connected to whatever air compressor is onboard. I would call a truck parts house and see what dryer element is the least expensive because that usually equates to the most common one and then go get that dryer. Also consider any of the bus manufacturers.


1993 32' Regency Wide Body, 4 speed Allison Trans, Front Entry door, Diamond Plate aluminum roof &
1981 Euro 22' w Chevy 350 engine and TH 400 tranny
 
Posts: 1406 | Location: Houston Texas | Member Since: 12-19-2006Reply With QuoteReport This Post
Picture of Doug Smiley
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Posts: 2258 | Location: Nova Scotia | Member Since: 12-08-2006Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 10/08
Picture of MWrench
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Thanks Doug, I have been all thru both of these Haltex tech notes. The part numbers ending with an "X" are re-manufactured.

Tom, please review the links Doug sent. Clearly the Cummins/Holset compressors require a special dryer or conversion valves to prevent oil from getting into the air system. A standard run of the mill dryer can not be used with Cummins/Holset compressors.

" The E or QE type compressors must be installed with a compatible air dryer so the compressor WILL NOT pass oil into the air system. The compatible dryer must maintain pressure in the discharge line while the compressor is unloaded or an Econ Valve and Check Valve must be used in the system."

Here is where the core charge issue is. My original dryer or refresh components are no longer available. To get a dryer compatible with the Cummins/Holset compressor, I need to get a new or re-manufactured unit. Re-manufactured units are cheaper than new units BUT, because because Haltex re-manufacture these dryers, they want a core back or you will be charged. My original dryer is no longer a valid part number so it will not qualify as a valid core for the newer design!

I have found and gotten information as to how to convert a standard Bendix AD-9 dryer (not a drop in but available locally) to work with my compressor, will require removal of an input check valve and econ valve from my old unit and some change of the plumbing and dryer mounting. Re-man including core charge,$367.00 + tax, new $429.00 + tax.

A drop in Bendix AD-9 modified for use with Cummins/Holset compressors by Bendix is $480.00 + tax and $90.00 core. charge


Ed
94 30' Breakaway #3864
30-BS-6B side entry
230 Cummins, Allison 6 speed
Spartan chassis
K9DVC
 
Posts: 1959 | Location: Los Gatos, CA | Member Since: 12-08-2005Reply With QuoteReport This Post
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