Recent Posts

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Fuel System / Re: Preventing HEUI Pump Failure
« Last post by doorguy on November 28, 2018, 05:44:46 PM »
I had read  a few months ago about the CAT retrofit auxiliary filtration system for the HEUI pump.  Does anyone know about this and does it seem like a fix to prolong the pump?  Just curious.
Other Systems / Re: Power switching to charge house batteries?
« Last post by pfhays on November 28, 2018, 03:26:15 PM »
On most motor homes the two sets of batteries are connected together with a 200 amp or larger solenoid.  The solenoid is activated by a switch in the cockpit or by an oil pressure switch.  My solenoid failed and until I could get it fixed I jumped the positive posts together on the two sets of batteries.  I removed the jumper when parked.
Other Systems / Re: Power switching to charge house batteries?
« Last post by Brett Wolfe on November 28, 2018, 05:34:03 AM »

If it and the wiring is functioning properly, it should allow alternator (or charger-- it is bi-directional) to charge both battery banks.

Also, can serve as boost/combine switch for starting.

So, pull out your VOM and see what has failed, been disconnected, etc.
Other Systems / Power switching to charge house batteries?
« Last post by zagracing on November 27, 2018, 02:29:21 PM »
Hey Folks,

About 6 months ago, I purchased a 2003 Freightliner Columbia ShowHauler. Great rig with the MBE4000 engine
I got a great deal on it due to it needing a bunch of work including the fact that the diesel generator it used to have is now gone. Bummer but I will get it replaced eventually with either another diesel or a LPG generator.

One of the thing I noticed when compared to my Damon A-Class (I still have that one too) was that when the rig runs on the Damon, it is busy charging the house batteries. I installed a meter on the house DC line so I can see it up over 14volts when the rig is running. The ShowHauler on the other hand does not charge the house batteries and upon investigation, I discovered a Sure Power switch installed.

Not quite sure where the other lead goes yet and it may not be terminated at all.

My question is whether or not it is ok to send that lead to the house batteries if it isn't there already. I might have a bad switch or maybe there is something I need to engage to allow it to work. I will look into this. My question is a general concern around the trucks alternator ability to charge up all of those batteries. It does have 4 large 12volt batteries for the truck anyway so I would suspect I am safe?

Fuel System / Re: Preventing HEUI Pump Failure
« Last post by Gadget Man on November 14, 2018, 01:33:14 PM »
Ok thanks guys. Curious if there's any truth re: the zinc claim.

Thanks for the info.
Fuel System / Re: Preventing HEUI Pump Failure
« Last post by Brett Wolfe on November 14, 2018, 06:21:39 AM »
Sorry, don't have any info on advantage of Caterpillar oil vs either Shell Rotella T or Delo 400. Have not heard of bad experiences with any of them if changed as they should be.

As Dave pointed out, annual/5-7,500 mile oil changes are very important.
Fuel System / Re: Preventing HEUI Pump Failure
« Last post by David.e.atherton on November 14, 2018, 05:36:48 AM »
Gadget man ,engine oil and Caterpillar Heui system. To answer your question the biggest
Problem with the Caterpillar Heui System is extending service periods of oil and filters
that build up of oil sludge within the engine. Want to maintain trouble free service would
suggest service at 7,500 miles. Most of the problems lay within the Heui high pressure
Engine oil starting at the injection Actuation pressure regulator, injection Actuation pressure
Sensor and the injectors Actuation themselves. The main reason breakdown of engine oils
from extended service periods . As far as what type of engine to use is everyone choosing
Of there own and cost they want to spend. Would get with Brett Wolfe where he can expand
on oils, filters etc with his maintenance information. This is a two fold question and Dave
has explained the engine results in operation and again Brett can expand on the maintenance.
Ask Dave, Dave Atherton Retired Cat Mechanic
Fuel System / Preventing HEUI Pump Failure
« Last post by Gadget Man on November 13, 2018, 06:01:44 PM »
Like many informed owners of older CAT C7 engines, I’m aware of issues with the engine’s HEUI pump system. I’ve been told that providing clean filtered oil to the engine should help to minimize a HEUI pump failure. With this in mind, I change my oil and filter every year or 5k miles.

I read an interesting post in an RV forum, where a CAT C7 owner claims that running CAT brand motor oil minimizes the risk of HEUI failures even more. He went on to say that CAT had the oil engineered by Mobil Oil, to help reduce HEUI pump failures. He believes they did this by adding extra zinc to the oil blend.

I don’t believe everything I read in forums. Brett has never steered me wrong. Is there any way to confirm or debunk the above claim?
Routine Maintenance / Re: Allison Service Procedure
« Last post by David.e.atherton on October 30, 2018, 03:01:50 PM »
Captpar, your not in trouble on overfill. When draining transmission you do not drain 100%
of all the fluid because there is little oil Trapped in the system. Checking messenger on
Allison touchpad also indicated some thing. Biggest thing recheck bolts torque on filter
housing and filter housing being wet from weeping gasket. Ask Dave, Dave Atherton Retired
Cat Mechanic
Routine Maintenance / Re: Allison Service Procedure
« Last post by Captpar on October 30, 2018, 11:42:48 AM »
Changed filters and after thinking about it went ahead ang changed the fluid. I marked my container for the drained fluid so I would know how much to replace. The drained fluid showed
4 gallons,so I poured in four  gallons of new transsyde. However when I poured the old fluid  into the jugs I only got 3.75 gallons. So I overfilled by one quart.  Not really wanting to open it up again and drain a qt out,I fired it up and went for a ride to heat up the transmission. Then checked it with keypad!,it stated oil OK. So am I good to go,Or do you recommend draining the qt out?
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