Blue Ox BX88420 Installation Instructions Manual

Mud flap system

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BX88420 & BX88421

Mud Flap System

Installation Instructions

Adjustable Mud Flap System

BX88420

Attaches to a 2" Receiver, 3/8" Thick, 24" x 24" Wide

Adjust from 67-14" to 96-3/4", Trim from 24" to 10-3/4"

BX88421

Attaches to a 2-1/2" Receiver, 3/8" Thick, 24" x 24" Wide

Adjust from 67-14" to 96-3/4", Trim from 24" to 10-3/4"

Please read these Installation Instructions in their entirety prior to

installing or operating this equipment.

CAUTION

Consumer assumes all risks associated with product performance

after installation. Blue Ox

Mud Flap System will not protect

everything and everyone from harm. Results may vary depending

upon road surface and conditions, vehicle types, weather

conditions, installation, and driving input. Please apply common

sense to you expectations relating to product performance.

405-0834 Rev A

Page 1 of 22

10/4/23

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Summary of Contents for Blue Ox BX88420

Page 1 Please visit www.blueox.com for the latest version of these installation instructions. BX88420 & BX88421 Mud Flap System Installation Instructions Adjustable Mud Flap System BX88420 Attaches to a 2” Receiver, 3/8” Thick, 24” x 24” Wide Adjust from 67-14” to 96-3/4”, Trim from 24” to 10-3/4”...
Page 2 BX88420 & BX88421 Mud Flap System Installation Instructions Important Exhaust Systems Note: Any Modifications to the factory installed exhaust system may void your manufacturer’s warranty. Car Washes You must remove rock guard system before entering any drive-through car wash. Prop 65 WARNING: This product can expose you to chemicals including chromium and acrylonitrile, which is known to the state of California to cause cancer, birth defects, or reproductive harm.
Page 3 BX88420 & BX88421 Mud Flap System Installation Instructions Tools Required Utility Knife Tape Measure/Yardstick Hammer/Mallet Straight Edge ≥ 24” Torque Wrench 8MM Socket 8MM Wrench 10MM Socket 10 Wrench 13MM Socket 13MM Wrench 17MM Socket 17MM Wrench 27MM Socket 27MM Wrench...
Page 4 (In most cases it will be Grade 5, please reference the parts list above). Replacement parts may be ordered through Blue Ox®. Failing to follow and/or altering these installation instructions in either installation or required equipment will void the manufacturer’s warranty.
Page 5 BX88420 & BX88421 Mud Flap System Installation Instructions Figure 1 Figure 1 Assembly Hints: • Refer to Figure 1 for component names and general definitions. Names in ALL CAPITALS refer to parts named in the illustrations. • It may be easier to assemble the system while attached to a BALL MOUNT on the vehicle.
Page 6 BX88420 & BX88421 Mud Flap System Installation Instructions Assembly Instructions: Account for all parts listed in the Parts List Figure 2 Figure 2 Slide HUB ASSEMBLY on to BALL MOUNT and insert into vehicle RECEIVER HITCH. See Figures 2 & 3.
Page 7 BX88420 & BX88421 Mud Flap System Installation Instructions 5. Re-install M6 ARM CLAMP BOLTS and M6 NYLON INSERT HEX NUTS back into HUB ARMS after the SUPPORT ROD is inserted. (Do not tighten yet.) 6. Position the left and right FLAP SUPPORT RODS so the width adjustment holes face forward horizontally.
Page 8 BX88420 & BX88421 Mud Flap System Installation Instructions IMPORTANT: This next step is critical in ensuring that the MUDFLAP SYSTEM is properly installed. All measurements should be made while tow vehicle has full tongue weight. 8. Make sure SUPPORT RODS are level on both sides and measure the distance from the bottom of FLAP SUPPORT ROD to the ground.
Page 9 BX88420 & BX88421 Mud Flap System Installation Instructions 10. Use a sharp utility knife to cut through MUD FLAP using the groove and a straight edge as a guide. This may take several passes to completely cut through MUD FLAP. Figure 8.
Page 10 BX88420 & BX88421 Mud Flap System Installation Instructions 12. Assemble cut end of MUD FLAP into FLAP CLAMP by either sliding or pushing it down onto top of MUD FLAP with the square holes on the smooth side. Note: Should it be difficult to slide MUD FLAP into FLAP CLAMP, moisten the cut end of MUD FLAP surface before inserting.
Page 11 Mud Flap System Installation Instructions 14. Assemble TRIM PLATES. Insert M6 TRIM PLATE SPACERS into holes in raised bottom portion of MUD FLAP. Attach the BLUE OX TRIM PLATE with the eight (8) M6 TRIM PLATE BOLTS (Locking STAR PIN [STAR PIN wrench included], M6 FLAT WASHERS, and M6 NYLON INSERT HEX NUTS as shown in Figure 10.
Page 12 BX88420 & BX88421 Mud Flap System Installation Instructions 16. Finalize all positioning and adjustments. For all conversions see Torque conversion table on page 2. 17. Make sure the M10 SPLIT WASHERS and M10 JAM NUTS remain loose on the M10 BALL MOUNT CLAMP BOLTS and finish tightening the M10 CLAMP BOLTS evenly onto BALL MOUNT.
Page 13 BX88420 & BX88421 Mud Flap System Installation Instructions IMPORTANT: Evenly tighten the three M2 ARM CLAMP BOLTS beginning with the cen- ter bolt and moving from one to another on each side until all are tight. The SLOT will NOT close. (70-80 in-lbs torque [5 mm ALLEN WRENCH]).
Page 14 Mud Flap System Installation Instructions 22. The Blue Ox Mud Flap System is now ready to use. As a final safely procedure, check bolts to see that they are tight and properly assembled. For optimum service and life, check components and the torque on all bolts prior to each use. Figure 13.
Page 15 BX88420 & BX88421 Mud Flap System Installation Instructions Bolt Bumpers 405-0834 Rev A Page 15 of 22 10/4/23...
Page 16 (In most cases it will be Grade 5, please reference the parts list above). Replacement parts may be ordered through Blue Ox®. Failing to follow and/or altering these installation instructions in either installation or required equipment will void the manufacturer’s warranty.
Page 17 NOTE: The Bolt Bumpers should never be used on a vehicle with rear-facing exhaust 4. Remove the M8 Nylon Insert Hex Nuts and M8 Flat Washers from the Blue Ox Mud Flap System using a 13mm wrench or socket...
Page 18 Mud Flap System Installation Instructions 6. Affix the Rock Screen to the Blue Ox Mud Flap System by 1st placing the Rock Screen over the M8 Bolts and then placing the M8 Flat Washers over the Rock Screen. Secure the assembly using the M8 Nylon Insert Hex Nuts, as shown in Figure 2. Repeat this step for remaining Flap Hanger Bolts.
Page 19 13. Using an awl or another sharp tool, carefully make holes in the Rock Screen large enough for an M6 bolt to fit through. 14. Assemble the Tension Clamps onto the Blue Ox Rock Screen and Mud Flap assembly as shown in Figure 5, using the included M6 x 30mm bolts.
Page 20 Figure 5. Snap the Extrusions over the Rock Screen by pressing firmly to secure. 18. The Blue Ox Mud Flap and Rock Screen system is now ready to use. For optimum service and life, check components and the torque on all bolts prior to each use.
Page 21 Kit, Mud Flap Trim Plates CUSTOMER SERVICE COMMITMENT Blue Ox® is committed to providing you with exceptional customer care throughout your lifetime with our products. Our team is here to assist you with any questions you may have regarding the performance of your product.
Page 22: Limited Warranty
BX88420 & BX88421 Mud Flap System Installation Instructions LIMITED WARRANTY Automatic Equipment Manufacturing Company (“Automatic”) warrants this product to be free of defects in material and workmanship under normal use and service for the period of one (1) year from the original con- sumer date of purchase.

This manual is also suitable for:

Bx88421