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Revised 10/23/2017 

 

Page 1 

 

 

 
 
 
 
 

B4578BTPA 

Fender Mounting Instructions for MIN4000, MIN900, MIN1500 & MIN1554 Fenders 

 

STEP 1 

 

A.  Unpack all cartons and lay out parts. 

 

B.  Compare the parts with hardware kit B4578BTPA as shown in Figure 1. 

     

 

                

 

 
 
 
 
 

STEP 2

 

 

A.  Lay the fenders out and clamp them together (Figure 2). 

This will make bolting them together much easier. 
 

B.  Bolt the fenders together.  A pack of 5/16 

x 1” bolts, 5/16” 

nuts 

and 5/16” x 1- ½” fender washers is included in the 

kit. 

Use four bolts per joint.  Recommended torque is  

10-15 ft-lbs.

 

 

 
 
 
 

PART NUMBER

DESCRIPTION

QTY

PB5015

4.25" SWIVEL BRACKET 

4

I62C450BFL8/RBZFT 5/8-11 X 4 1/2 HEX FLANGE BOLT

4

I62CNCG/RBZ

5/8-11 CLASS G FLANGE LOCK N

4

PB1/2"SPACER

1/2" POLY SPACER

12

PB501026

26.5 COMPOSITE TAPERED BKT

4

PBLOCK

COMP BRACKET BACKING BLOCK

4

I31C300BSF/RBZ

5/16- X 18 X 3 HEX WASH HEAD B

16

I31C100BSF/RBZ

5/16-18 X 1 HEX WASHER HEAD BL

24

I31N150WFEZ

5/16 X 1 1/2 FENDER WASHER

24

I31CNCF/RBZ

5/16-18 CLASS F FLANGE LOCK

40

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 F FLANGE LOCK

14

I31C100BSF/RBZ

5/16-18 X 1 HEX WASHER HEAD BL

8

I31CNCF/RBZ

5/16-18 CLASS F FLANGE LOCK

8

I31N150WFEZ

5/16 X 1 1/2 FENDER WASHER

16

B4578BTPA Mounting Kit 

 
 

Figure 1 

Figure 2 

Summary of Contents for B4578BTPA

Page 1: ... 2 SPACER 1 2 POLY SPACER 12 PB501026 26 5 COMPOSITE TAPERED BKT 4 PBLOCK COMP BRACKET BACKING BLOCK 4 I31C300BSF RBZ 5 16 X 18 X 3 HEX WASH HEAD B 16 I31C100BSF RBZ 5 16 18 X 1 HEX WASHER HEAD BL 24 I31N150WFEZ 5 16 X 1 1 2 FENDER WASHER 24 I31CNCF RBZ 5 16 18 CLASS F FLANGE LOCK 40 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 ...

Page 2: ...y if using worn tires TIP Establish the minimum gap required in Step 3B a For an air suspension system place a board on top of the tires after the air has been let out of the airbags Figure 3 Place the fender on top of the board b For a spring suspension system add to the measurement from Step 3A STEP 4 A Position the fenders exactly where they will be mounted a Visually pick and mark the location...

Page 3: ...the two fenders join together as possible Figure 7 a Drill three 5 16 holes through the fenders using the holes in bracket PB5069 as a guide b Use three 5 16 x 1 bolts to bolt the center bracket and fenders together Recommended torque for all 5 16 hardware is 10 15 ft lbs c Use 5 16 fender washers and 5 16 nuts provided with the kit on the inside of the fenders Figure 5 Figure 6 Figure 7 NOTE Do n...

Page 4: ... 5 16 holes through the fender using the holes in bracket PB5071 as a pattern Figure 9 a Install the 5 16 x 1 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 c Recommended torque for all 5 16 bolts is 10 15 ft lbs H If possible position the mounting brackets so they are located within 15 of the bottom of the...

Page 5: ...TE 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 12 Make sure to only tighten halfway and then repeat the pattern in Figure 12 until backing block is tight STEP 6 A Once the brackets are placed in position with the fender securely tighten the 5...

Page 6: ... tightening with Torque wrench is recommended DO NOT EXCEED RECOMMENDED TORQUE e Make sure the fenders are square and aligned Figure 14 Twists or bows in the fender will fatigue the material over time STEP 8 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 en...

Page 7: ...Revised 10 23 2017 Page 7 ...

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