Revised 04/01/2016 Page 1
B4850BTPACF
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 B4850BTPA 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).
B4850BTPACF Mounting Kit
Figure 1
PART%NUMBER DESCRIPTION QTY
PB5015 BRKT,5015,STL,SWVL,4.25,BLK 2
I62C450BFL8/RBZFT HDWR,HHCS,RBZ,FLNG,5/8-11X4.5 2
I62CNCG/RBZ HDWR,NUT,RBZ,FLNG-LOCK,5/8-11 4
PB1/2"SPACER HDWR,SPCR,PE,.5 8
PB501026CF BRKT,5010,PP,TPRD,26,CFBR 2
PBLOCK BRKT,BLOCK,PP,BLK 2
I31C300BSF/RBZ HDWR,HHCS,RBZ,SERR,5/16-18X3 8
I31C100BSF/RBZ HDWR,HHCS,RBZ,SERR,5/16-18X1 12
I31N150WFEZ HDWR,WSHR,ZINC,5/16X1.5 12
I31CNCF/RBZ HDWR,NUT,RBZ,FLNG-LOCK,5/16-18 42
PB5067 BRKT,5067,STL,CNTR,ANGL 2
I62C250BFL8/RBZ HDWR,HHCS,RBZ,FLNG,5/8-11X2.5 2
PB5069 BRKT,5069,PE,CNTR,.5 2
I31C125BSF/RBZ HDWR,HHCS,RBZ,SERR,5/16-18X1.2 22
PB5071 BRKT,5071,PE,CNTR,ANGL 2
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Figure 2
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 bolt to the frame.
B. 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.
a. Splash guards are available if
additional coverage is wanted
with a half fender set (Figure 3).
C. Spacers are supplied to bring the steel swivel away
from the frame in the event of any obstructions
(Figure 4).
c. The ideal setup is to mount the
steel swivel directly to the frame.
NOTE: Use spacers only when necessary.
D. Install center bracket assembly (Figure 5).
a. Try to use existing holes in the frame to bolt
Figure 4
Figure 3
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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
E. 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. Recommended torque for all 5/16”
hardware is 10-15 ft-lbs.
c. Use 5/16” body washers and 5/16” nuts provided with the kit
on the inside of the fender.
F. 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).
b. 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 ftlbs.
Tip: PB5071 is also used as a height
adjustment for the end of the fender.
G. 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.
b. Use 5/16” fender washers and 5/16” nuts provided with the kit on the
underside of the fender. Torque all 5/16” bolts to 10-15 ft-lbs.
Figure 5
Figure 6
Figure 7
Figure 8
See IMPORTANT assembly
instructions for center bracket
PB5069 & PB5067, last page
of this form.
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H. 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 to
http://www.minimizer.com/instructions .html
for further suggestions on adding additional
support.
STEP 4
A. Use four 5/16” x 3” bolts to attach the
bracket (part number PB501026) and
the backing block (part number
PBLOCK) to the steel swivel (part
number PB5015). As shown if Figure
10. Make sure the pipe end of the
PB5015 is fully engaged into bracket.
TIP: USE CARE WITH POWER TOOLS
AS OVER-TORQUING WILL CAUSE CRACKS IN
THE BRACKET. RECOMMENDED TORQUE IS 1015 ft-lbs.
NOTE: DO NOT EXCEED RECOMMENDED
TORQUE. THIS WILL VOID THE WARRANTY.
TIP: Do not completely tighten one side of the backing
block before moving to the other side. Alternate
tightening bolts as pictured in Figure 11. Make sure to
only tighten halfway and then repeat the pattern in
Figure 11 until backing block is tight.
STEP 5
A. Once the brackets are placed in
position with the fender, securely
tighten the 5/8” x 4-1/2” bolts that
go through the PB5015 steel
swivel to attach the swivel
securely to the frame (Figure 12).
Recommended torque is 160170 ft-lbs.
Figure 9
Figure 12
Figure 11
Figure 10
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STEP 6
A. Attach the bracket (PB501026A) to the fender.
a. Drill six 5/16” holes through the
fender using the holes in bracket
PB501026A as a guide.
b. Install the 5/16” x 1” bolts through
the bracket and into the fender.
c. Use six 5/16” body washers and
5/16” nuts provided with the kit on
the underside of the fender.
d. Tighten the bolts to
recommended torque of 10-15
FT-LBS. Hand tightening with
Torque wrench is recommended.
DO NOT EXCEED
RECOMMENDED TORQUE.
e. Make sure the fenders are square
and aligned (Figure 13). Twists or
bows in the fender will fatigue the
material over time.
STEP 7
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.
NOTE: ONCE FENDERS ARE IN SERVICE OCCASIONALLY CHECK TORQUE ON
5/8” X 4-1/2” HEX BOLTS IN THE FRAME TO MAKE SURE THEY DO NOT LOOSEN
OVER TIME.
Figure 13
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