Blue Ox Exhaust Brakes

WM728

Blue Ox retarder devices provide downhill retarding horsepower as well as cold weather protection for the engine in both highway & idling modes. This is a bolt on retarder unit designed to mate with certain naturally aspirated or super charged diesel engines. This unit fits the four bolt, 4" exhaust flange popular on some Cummins 855 cubic engines.

Blue Ox WM728

Blue Ox WM728 schematic

Complete installation kits include

Item
Part
Number
Quantity
Description
Item
Part Number
Quantity
Description
1
728-01
1
Housing
 
15
3325X2
1
Hex Nipple
2
728-02
1
Shaft
 
16
728-40
1
Hair Clip
3
728-03
1
Butterfly
 
17
728-16
3
Piston Ring
4
728-09
2
Rivet Assy.
 
18
728-55
1
Snap Ring
5
728-04
1
Bracket Assy.
 
19
728-28
2
Mounting Screw
6
728-05
1
Cylinder Assy.
 
20
728-29
2
Lock Washer
7
728-06
1
Lever
 
21
728-35
1
Shaft Nut
8
728-08
1
Clevis Assy.
 
22
728-29
1
Lock Washer
9
1
Lock Nut
 
23
728-36
1
Stop Screw
10
1
Clevis Pin
 
24
728-37
1
Stop Nut
11
728.23
1
Breather
 
25
728-06
2
Gasket
12
728-17
1
Bushing
 
26
728-25
4
Screw 1/2 X 1.5"
13
728-18
1
Bushing
 
27
728-26
4
Screw 1/2 X 1.75"
14
728-19
1
QR Valve
 
28
728-41
8
Lock Nut 1/2"