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Maintenance Notes

Click on the various photos and links throughout this page for more information.


This page includes some links to various items of interest concerning maintenance of the 2017 Monaco Diplomat and similar motor homes.

Engine Maintenance:  See maintenance intervals as posted on the Cummins web site.  Here is a brochure for the ISL9 EPA 2013 Engine.  Download the Cummins ISL9 Quick Reference Guide for part numbers and operating over-view.

The ISL9 engine on this coach includes a Selective Catalytic Reduction (SCR) Aftertreatment system and is compliant with 2013 EPA Standards.  Therefore it requires the use of Diesel Exhaust Fluid (DEF).  For those new to DEF, here is a good brochure to bring you up to speed.  And here is a Dash Lamp Quick Guide for Afterteatment System faults.

DPF and Regeneration Concerns:  Some owners of newer motorhomes with SCR After treatment systems have questions about doing a Parked Regeneration (Regen) of the Diesel Particulate Filter (DPF).  My belief is that this is more a concern for truck operators than it is for motorhomes - especially trucks that engage in a lot of "light duty cycles" (excess idling, or a lot of stopping and starting in city operations).  Motorhomes are normally run in highway situations where the engine load is high enough for the DPF to clean (regenerate) itself with, with no input from the driver, via both passive and active regenerations.  That said, all owners should be familiar with the various warning light configurations as they apply the the DPF system, and how to do a manual Parked Regeneration, should it ever become necessary.  In addition to the Dash Lamp Quick Guide mentioned above, here are some more detailed descriptions of what the lamps are telling us, and the proper Parked Regeneration procedure that we would follow in our motorhomes (courtesy of John Morenz, another 2017 Dip owner).   Note that REV coaches do NOT have Regen Switches in the cab.  You have to pull a shorting plug as described in this link and in section 4-6 of our chassis owner's manual.  Here is a picture of the location of the shorting plug on the left side of my steering column under the dash (the white plug under the on-board data port) .

Winterizing the Diplomat:  Click on the picture for an organized, easy-to-follow procedure that I wrote for winterizing a Monaco Diplomat and similar motor homes, based on personal experience and information from the Diplomat Owners Manual. 

The 2017 Dip does not come with a winterizing bypass valve in the water bay.  I was told that is because it has a high-yield Remco 55AquaJet-ORV water pump and 3/4" plumbing instead of the more standard 1/2" lines.  The water pump also features Quick Connect fittings, so you can get a barbed elbow fitting to snap on the pump, which makes winterizing fairly easy without the bypass valve.  If you need a replacement inlet strainer screen and housing for the Remco AquaJet water pump, you can get it at a good price at RVUpgrades.com

Wiper Blades:  Nowhere in the owner's manual does Monaco recommend a part number for wiper blade replacements.  Until recently, I have always had difficulty finding blades that were heavy enough to do a proper job and also fit the arms installed on the coach.  Then I discovered Trico number 67-321 Heavy Duty 32 inch blade replacements made for trucks, busses, and RV's.  These blades are up the the task.  You can find them at many truck supply houses or at Amazon or Ebay, etc. 
Freightliner XCM Chassis:  The Chassis Owner's Manual from FCCC contains an entire maintenance manual which is very detailed.  Also, the FCCC web site has a Maintenance Tips Page, with various general information including links to other more specific information.  It's worth checking out.  Finally, there are a lot of downloads here on the FCCC site including specific maintenance interval check-lists, videos on some of the chassis features, and more.

Also, on the Daimler Trucks North America web site, you can register as a Freightliner Custom Chassis owner.  You put in your VIN number as part of the registration process.  Under "Company Name", just use your own name as it is listed in FCCC records (if you know it).  After that, you can log in for maintenance information specific to your chassis, including parts identification, service literature, and even wiring diagrams. 

For those with a Freightliner Custom Chassis, you can download wiring diagrams and other chassis related information from the Damler Truck North America web site.   (See the previous paragraph.)
Ride Height Specs:  Ride height adjustment should be done by a Freightliner shop, a truck alignment shop, or a repair facility experienced with motorhome chassis.  It is not recommended owner maintenance due to the potential danger of working on the suspension system while under the coach.  The measurements will vary between different coaches and even different configurations of the same model (due to different configurations of the suspension system).  Here are the measurements for the 2017 Monaco Diplomat with V-Ride rear suspension and ZF Independent Front Suspension...

Front (one adjustor feeds both air bags):  15 3/4" as measured between the top and bottom shock mounting bolts.  (A quick rough check is that the distance between the top of the tire and the bottom of the fender rim is about the width of a man's hand at it's widest point.) 

Rear (separate adjustor for each side):  10 1/4" as measured from the bottom of the frame rail (directly above the axle centerline) to the to the center of the lower shock mounting bolt.  (There's more space above the rear tires to the fender rim, than there is in the front.)

Firefly Control System:  The Firefly System was introduced in REV mid-level luxury motorhomes in 2016.  It replaces all the previous system controllers, gages, light switches, etc. into one central touch screen.  The system also includes six remote switch panels throughout the coach for various functions.  Most LED lights are dimmable by pressing and holding the switch button.  It is a reliable system, with great customer service from the manufacturer supplier.   Firefly often does software updates to the system.  You can deal directly with them to update the software yourself.  For a reasonable fee, they will also perform custom programming for individual customers.  Here is their contact information.   Click here to see the Firefly layout diagram for the Diplomat 43 SG/G.  Other coaches will be similar.

Click on the picture to the left for more information.  See the "Fixes Page" of this site for an explanation of how to reboot the system, should that become necessary.  There is an addendum in the back of the coach user manual that describes the system, but it is generic in nature, and not very complete.  Here is a copy of that

 The Smart Wheel system, supplied by VIP (Vehicle Improvement Products) has some good information on their web site, for both the current V4 MPX system and older systems. 

     Owner's Manual          Trouble-Shooting Guide

RKE-100 Keyless Entry System:  This is the proprietary keyless entry system made by Magnadyne for Fleetwood that is used in REV coaches.  In the 2017 Diplomat this unit is located on the floor behind the center storage tray under the dashboard.  It is hard to find information for this system on the internet, so here are some documents I have gathered...

     Owner's Manual & Programming Instructions      Harness Drawing      Harness Pin-outs


Where to Go for Repairs:  When the initial one year warranty period is over, where is the best place to take your motor home for maintenance, or when things need fixed?  That's an important consideration for me, since I'd have to travel to Decatur, IN to get to the nearest REV factory shop - a round trip of almost 1200 miles.  That said, I have been to the REV shop in Decatur twice.  I found them to be very professional, with friendly service reps and skilled repair technicians.  They also have customer-friendly polices, like hook-up sites where you can live in your coach, and their policy about allowing customers into the shop area while the coach is being worked on.  Find contact information here.  A fourth facility will soon be opening near Phoenix, AZ. 

Generally, where I go for repairs depends on what I need done.  If something on the "house side" needs fixed, there's nothing like an experienced RV repair facility to get the job done right.  So I'll go back to the dealer, or another reputable RV repair facility, for that.  For specialized chassis work, Freightliner Custom Chassis has a network of over 450 Freightliner maintenance facilities that work on motorhomes, including more than 90 Oasis network dealerships that specialize in motorhome chassis repairs.  You can find the one nearest to you here on the FCCC web site.  If the engine or transmission need attention, I'll take it to a qualified Cummins or Anderson shop - usually a good truck repair facility that's on Cummins list of qualified shops. 

But for routine safety inspections, lube jobs, preventative maintenance, and most chassis related repairs, I've found no place better than the local bus garage in my home town.  The mechanics are skilled, meticulous, and don't mind working on motor homes.  And the price is more reasonable than larger shops.

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Last updated on 08/11/2017