Roadmaster 921-3 User manual

KIT# 921-3
07/31/13
KS
R O A D M A S T E R,I N C.
ROADMASTER, Inc. 6110 NE 127th Ave. Vancouver, WA 98682 360-896-0407 fax [phone] www.roadmasterinc.com
BASEPLATE KIT
INSTALLATION INSTRUCTIONS
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ITEM QTY NAME MATERIAL
1.......... 2...........5/8” x 3” BOLT ........................................................................................ 350154-00
2.......... 2...........5/8” LOCK WASHER.............................................................................. 350313-00
3.......... 2...........1/2” x 4” BOLTS...................................................................................... 350105-00
4.......... 2...........1/2” x 1 1/2” BOLT .................................................................................. 350095-00
5.......... 4...........1/2” LOCK WASHER.............................................................................. 350309-00
6.......... 2...........1/2” HEX NUT......................................................................................... 350258-00
7.......... 8...........8mm x 1.25 x 30 mm BOLT.................................................................... 356001-00
8.......... 8...........8mm LOCK WASHER ............................................................................ 355705-00
9.......... 8...........8mm FENDER WASHER....................................................................... 355702-00
10........ 2...........5/8” DRAW PIN W/ CLIP........................................................................ 357035-00
11 ........ 2...........3/16” x 1 1/4” x 2” BACKING PLATE...................................................... A-002489
12........ 1...........DRIVER SIDE BRACE ........................................................................... C-001602
13........ 1...........PASSENGER SIDE BRACE .................................................................. C-001603
14........ 1...........MAIN RECEIVER ................................................................................... C-002171
15........ 1...........DRIVER SIDE ARM ............................................................................... C-001477
16........ 1...........PASSENGER SIDE ARM....................................................................... C-001476
Important
Note: this bracket will not accom-
modate the Guardian rock shield,
some models of the Tow Defender,
Stowaway or the StowMaster and
StowMaster All Terrain tow bars.

KIT# 921-3
07/31/13
KS
Fig.A
Fig.B
T
his bracket kit is one of our MX series,
which allows the visible front portion of
the brackets to be easily removed (Fig.A
and Fig.B). The kit consists of the main receiver
brace, two rear braces, removable front braces
and a hardware pack.
The main receiver brace mounts to the frame
rails and bumper core on each side. The remov
-
able front braces insert into the receivers on each
side and are secured with draw pins.
Before starting the installation, lay out the kit
components in order, as they will be used. This
will give you a visual idea of how the components
work, and will also confirm that everything is pres-
ent and accounted for.
IMPORTANT: All baseplates must be assembled with all the bolts left loose for final adjustment and positioning (before
tightening) unless otherwise instructed. All bolts must be torqued for proper strength. If more than one bolt is used per
fastening point, the diagram may only show one.
• Use flat washers over all slotted holes • Use lock washers on all fasteners
•Installation of most baseplates requires moderate mechanical ap-
titude and skills. We strongly recommend professional installation by
an experienced installer.
•The installer must read the instructions and use all bolts and parts
supplied. Failure to do so could result in loss of the towed vehicle.
•Use Loctite® Red on all bolts used for mounting this bracket.
•Every 3,000 miles, the owner must inspect the fasteners for proper
torque, according to the bolt torque requirements chart on the last
page of these instructions. The owner must also inspect all mount-
ing points for cracks or other signs of fatigue every 3,000 miles.
Failure to do so could result in loss of the towed vehicle.
•The owner must check the vehicle manufacturer's instructions for
the proper procedure(s) to prepare the vehicle for towing. Some
vehicles must be equipped with a transmission lube pump, an axle
disconnect, driveline disconnect or free-wheeling hubs before they can
be towed. Failure to properly equip the vehicle will cause severe
damage to the transmission.
•If running changes were made by the vehicle manufacturer after this
kit was designed, some bolts or other fasteners in the hardware pack
may no longer be the correct size. It is the installer’s responsibility
to verify that the baseplate is securely fastened to the vehicle and fit-
ted with the correct hardware to account for these changes. Failure to
securely fasten the baseplate could result in loss of the towed vehicle.
•If the towed vehicle has been in an accident, it must be properly re-
paired before attaching the baseplate. Do not install the baseplate if
any structural frame damage is found. Failure to repair the damage
could result in the loss of the towed vehicle.
ROADMASTER Limited Warranty, including One-Year Conditional Warranty Text and Product Registration Card, in Carton.
• Roadmaster manufactures many styles of baseplates. If your base-
plate has removable arms, they must be removed before driving
the vehicle, unless the arms can be pinned or padlocked in place.
If not secured, the arms could vibrate out, resulting in non-warranty
damage or personal injury.
•Some motorhome chassis have such a tight turning radius that you can
damage your motorhome, towed vehicle, tow bar or baseplate while turn-
ing sharply. Before getting on the road, test your turning radius in
an empty parking lot. Turning too sharply could result in non-warranty
damage to towing system, motorhome and/or towed vehicle.
•Do not back up with the towed vehicle attached or non-warranty
damage will occur to your towing system, motorhome and/or towed
vehicle.
•The safety cables must connect the towing vehicle to the towed
vehicle frame to frame, with the cables crossed, with enough slack
for sharp turns. Refer to the cable instructions for proper routing.
Failure to leave enough slack in the safety cables, or failure to connect
the safety cables frame to frame, will result in the loss of the towed
vehicle.
•This kit is designed for use with ROADMASTER tow bars and ROAD-
MASTER adaptors only. Using this kit with other brands, without
an approved ROADMASTER adaptor, may result in non-warranty
damage or injury.
•Do not use this document for custom fabrication, as it may not show
all parts or structural components. Custom fabrication, or any attempt
to copy this baseplate design, could result in loss of the towed vehicle.
•Upon final installation, the installer must inspect the baseplate to
ensure adequate clearance, particularly around hoses, air condi-
tioner lines, radiators, etc., or non-warranty damage to the towed
vehicle will result.
•This baseplate is only warranteed for the original installation. In-
stalling a used baseplate on another vehicle is not recommended and
will void the warranty.
Failure to follow these instructions
can result in property damage,
personal injury or even death.
WARNING
BASEPLATE KIT
INSTALLATION INSTRUCTIONS
ROADMASTER, Inc. 6110 NE 127th Ave. Vancouver, WA 98682 360-896-0407 fax [phone] www.roadmasterinc.com

KIT# 921-3
07/31/13
KS
All illustrations and specifications contained herein are based on the latest information available at the time of publication approval.
ROADMASTER, INC. reserves the right to make changes at any time without notice in material, specification and models or to discontinue models.
1. Important: please use all supplied bolts and parts and read all instructions carefully before beginning this
installation. The majority of questions you may have can be answered within the text, and proper installation will
ensure safe and secure travel. Now, begin the installation by removing six plastic fasteners attaching the corner of the
fascia to the corner of the fender (Fig.C).
2. On each side, remove one plastic fastener attaching the bottom of the fender liner to the fascia (Fig.D).
3. On each side, remove three plastic fasteners attaching the bottom of the fender liner to the fascia (Fig.E). Note: the
approximate location of the second and third fasteners are
also noted.
4. On each side, remove one 13mm (head) bolt and two
plastic fasteners attaching the splash shield and fascia to
the core support (Fig.F).
5. Pull back the fender liners and disconnect the fog
lights, if the vehicle is so equipped. Pull out and forward on
the corners of the fascia to remove it (Fig.G).
6. On each side, remove four 12mm (head) bolts attach-
ing the bumper core to the frame rail. The bumper core will
not be replaced. Note: retain the bumper core and attach-
ment hardware so that it can be replaced if the bracket is
ever removed.
Fig.C Fig.D
Fig.E Fig.F
Fig.G
BASEPLATE KIT
INSTALLATION INSTRUCTIONS
ROADMASTER, Inc. 6110 NE 127th Ave. Vancouver, WA 98682 360-896-0407 fax [phone] www.roadmasterinc.com

KIT# 921-3
07/31/13
KS
All illustrations and specifications contained herein are based on the latest information available at the time of publication approval.
ROADMASTER, INC. reserves the right to make changes at any time without notice in material, specification and models or to discontinue models.
7. On each side, insert the rear brace into the end of the frame rail (Fig.H). Bolt the brace into place using the four sup-
plied 8mm x 1.25 x 30mm bolts and 8mm fender washers and lock washers. Note: use Loctite® Red on all bolts used for
mounting this bracket.
8. On each side, position the main receiver brace over the core support and bolt it to the rear brace using the supplied
5/8" x 3" bolt and 5/8" lock washer (Fig.I).
Fig.H Fig.I
Fig.J Fig.K
BASEPLATE KIT
INSTALLATION INSTRUCTIONS
ROADMASTER, Inc. 6110 NE 127th Ave. Vancouver, WA 98682 360-896-0407 fax [phone] www.roadmasterinc.com
9. On each side, use a pair of pliers to bend the lip of the frame rail out slightly next to the pre-existing hole in the bottom
of the frame (Fig.J). This will allow clearance for the head of an attachment bolt. Note: due to manufacturing variances,
the hole may need to be slightly enlarged with a die grinder.
On each side, place one of the supplied ½" lock washers over a ½" x 1½" bolt. Place the bolt over a ¼" x 1¼" x 2"
backing plate and bolt through the pre-existing hole in the frame and into the weld nut in the rear support brace (Fig.K).
10. On each side, using the lower outside mounting point as a template, drill a ½" hole through the bottom and top layers
of the radiator support. Note: use a piece of metal as a buffer to protect the engine components (Fig.L).
Using one of the supplied ½" x 4½" bolts and ½" lock washer and nut, bolt through the bottom of the lower support
brace, the radiator support and the top of the lower support brace (Fig.M).

KIT# 921-3
07/31/13
KS
Fig.M
Fig.N
14. Insert the removable front bracket arms into the front
receiver braces, and secure them in place with the sup-
plied 5/8" draw pins and spring pins.
15. Install the tow bar to the mounting bracket accord-
ing to the manufacturer's instructions. Connect the safety
cables to the safety cable tabs illustrated on the first page
of these instructions.
BASEPLATE KIT
INSTALLATION INSTRUCTIONS
ROADMASTER, Inc. 6110 NE 127th Ave. Vancouver, WA 98682 360-896-0407 fax [phone] www.roadmasterinc.com
Fig.L
11. Tighten all remaining bolts to the bolt torque requirements found at the end of these instructions.
12. On each side, trim the outside horizontal center ribs of the fascia to allow clearance for the main receiver brace. Use
the red lines in Figure N as a guide for trimming.
13. Reassemble the fascia, reversing steps 1 through 9.
BOLT TORQUE REQUIREMENTS
METRIC BOLTS
Thread Size Grade Plated / Unplated
12mm-1.25 ........8.8 ............70 ft./lb. 65 ft./lb.
12mm-1.5 ..........8.8 ............66 ft./lb. 61 ft./lb.
12mm-1.75 ........8.8 ...........65 ft./lb. 60 ft./lb.
14mm-2.0 ..........8.8 .........104 ft./lb. 97 ft./lb.
METRIC BOLTS
Thread Size Grade Plated / Unplated
8mm-1.0 ............8.8 ............20 ft./lb. 18 ft./lb.
8mm-1.25 .........8.8 ............19 ft./lb. 18 ft./lb.
10mm-1.25 ........8.8 ...........38 ft./lb. 36 ft./lb.
10mm-1.5 ..........8.8 ...........37 ft./lb. 35 ft./lb.
STANDARD BOLTS
Thread Size Grade Torque
5/16..................... 5........................... 13 ft./lb.
3/8....................... 5........................... 23 ft./lb.
7/16..................... 5........................... 37 ft./lb.
1/2....................... 5........................... 56 ft./lb.
5/8....................... 5......................... 150 ft./lb.
Note: The torque values represented below are intended as general guidelines. Torque requirements for specific applications may vary. Roadmaster does not warrant
this information to be accurate for all applications and disclaims all liability for any claims or damages which may result from its use.