Minimizer B4850WOA User manual

Revised 04/01/2016 Page 1
B4850WOA
Fender Mounting Instructions for MIN4050, MIN950 & MIN1550 Fenders
STEP 1
A. Unpack all cartons and lay out parts.
B. Compare the parts with hardware kit B4850WOA as shown in Figure 1.
STEP 2
A. Measure the suspension travel. This measurement is used to determine the distance
between the fender and the wheel.
a. For air suspension systems, let the air out of the air bags.
b. For spring systems, measure from the stops on the springs to the bottom of the
frame.
NOTE: For air suspensions with travel exceeding 6”:
In some cases a travel stop may need to be installed to prevent such large gaps
between the fenders & tires. This will help with alignment and 5th wheel plate clearance.
(Please call Minimizer @ 800-248-3855 for questions regarding this issue).
PART NUMBER DESCRIPTION QTY
PB5010 STEEL WELD-ON TAPERED BRACKET 2
I31C100BSF/RBZ 5/16-18 X 1 HEX WASHER HEAD BL 12
I31CNCF/RBZ 5/16-18 CLASS F FLANGE LOCK 12
I31N150WFEZ 5/16 X 1 1/2 FENDER WASHER 12
PB5067 STEEL ANGLE FOR PB5069 2
I62C250BFL8/RBZ 5/8-11 X 2 1/2 HEX FLG BOLT BZ 2
I62CNCG/RBZ 5/8-11 CLASS G FLANGE LOCK N 2
PB1/2"SPACER 1/2" POLY SPACER 2
PB5069 COMPOSITE CENTER BRACKET 2
I31C125BSF/RBZ 5/16-18 X 11/4 HEX WASH HEAD B 8
I31CNCF/RBZ 5/16-18 CLASS F FLANGE LOCK 8
PB5071 COMPOSITE ANGLE FOR PB5069 2
I31C125BSF/RBZ 5/16-18 X 11/4 HEX WASH HEAD B 14
I31CNCF/RBZ 5/16-18 CLASS G FLANGE LOCK 14
B4850WOA Mounting Kit
Figure 1

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B. Gap the fenders ¾” over the maximum travel point of
the suspension system. The goal is to make sure the
fender does not rub on the tire. A gap larger than ¾”
may be necessary if using worn tires.
TIP: Establish the ¾” minimum gap required in Step 2B.
a. For an air suspension system, place a ¾”
board on top of the tires after the air has
been let out of the airbags (Figure 2).
Place the fender on top of the board.
b. For a spring suspension system, add ¾”
to the measurement from Step 2A.
STEP 3
A. Position the fenders exactly where they will be
mounted.
a. Visually pick and mark the locations that
the brackets will attach to the frame.
B. It is possible to bolt a plate (not supplied)
to the frame and weld the brackets to that
plate (Figure 3). Another option is to weld
the bracket directly to the frame.
a. Plate should be a minimum
of ¼” thick steel.
Tip: Check owner’s manual before welding directly to the frame. Most
manufacturers do not suggest welding anything directly to the frame.
b. Splash guards are available if additional coverage
is wanted with a half fender set (Figure 4).
Figure 4
Figure 2
Figure 3

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C. Install center bracket assembly (Figure 5).
a. Try to use existing holes in the frame to bolt through. It is possible to remove any
existing frame bolt and replace it with the supplied bolt in the bracket kit.
Recommended torque for the 5/8 x 2-1/2” bolt with washer is 110-115 ft-lbs.
D. Install center bracket as close to the end of the fender as possible
(Figure 6).
a. Drill three 5/16” holes through the fender using the holes in
bracket PB5069 as a guide.
b. Use three 5/16” x 1 ¼” bolts to bolt the center bracket and
fender together.
b. Use 5/16” fender washers and 5/16” nuts provided with the kit
on the inside of the fender. Recommended torque is 10-15 ft-
lbs.
E. Some installations may not allow the center bracket to bolt through the end of the fender.
a. In these cases use the plastic angle
(PB5071) to connect the fender to the
center bracket assembly (Figure 7).
c. Use three 5/16” x 1” bolts, washers, and
nuts to bolt PB5071 to the center bracket
assembly. Do not tighten until these until
the fender is level. Recommended
torque is 10-15 ft-lbs.
Tip: PB5071 is also used as a height
adjustment for the end of the fender.
Figure 5
Figure 6
Figure 7
See IMPORTANT assembly
instructions for center bracket
PB5069 & PB5067, last page
of this form.

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F. Drill four 5/16” holes through the fender using the holes in bracket PB5071
as a guide (Figure 8).
a. Install the 5/16” x 1 ¼” bolts through the bracket and into the fender.
d. Use 5/16” fender washers and 5/16” nuts provided with the kit on
the underside of the fender. Recommended torque is 10-15 ft-lbs.
Step 4
If possible, position the mounting brackets so they are
located within 15” of the bottom of the fender. This
protects against wind blowing the leading edge of the
fender back into the tire (Figure 9).
Tip: If the front fender bracket is mounted higher
than 15”, refer
tohttp://www.minimizer.com/instructions%20.htmlfor
further suggestions on adding additional support.
STEP 5
A. Attach the bracket (PB5010) to the fender.
a. Drill six 5/16” holes through the fender using the
holes in bracket PB5010 as a guide.
b. Install the 5/16” x 1” bolts through the bracket and
into the fender.
c. Use six 5/16” fender washers and 5/16” nuts
provided with the kit on the underside of the fender.
d. Tighten the bolts. Recommended torque is 10-
15 ft-lbs.
e. Make sure the fenders are square and aligned
(Figure 10). Twists or
bows in the fender will fatigue the
material over time.
STEP 6
A. For trucks with air suspension, raise and lower the suspension one final time to confirm
that there is adequate clearance between the fenders and wheels.
B. Recheck all brackets and bolts to ensure they are tightened to the recommended torque
Figure 8
Figure 10
Figure 9

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