Blue Ox Exhaust Brakes

WM771/WM771A

Blue Ox retarder devices provide downhill retarding horsepower as well as cold weather protection for the 4 stroke engine in both highway & idling modes. This unit is designed to mount in-line and down stream of the turbo or manifold flange. The WM771 is the largest of the Blue Ox family and will mate with pipe sizes up to 5" as well as engine displacements generally of 466 to 855 cubic inches. Use WM902 mounting kits.

Blue Ox WM771-front

Blue Ox wm771-back

Blue Ox WM771 schematic

Complete installation kits include

1. WM771 AK02 - 4" 12 volt manual type foot operated.

2. WM771 AK04 - 4" 12 volt automatic type throttle rod actuated.

3. WM771 AK06 - 4" 12 volt automatic type electronic engine controlled.

4. WM771 AK12 - 5" 12 volt manual type foot operated.

5. WM771 AK14 - 5" 12 volt automatic type throttle rod actuated.

6. WM771 AK16 - 5" 12 volt automatic type electronic engine controlled.

7. WM771 AK18 - 3 1/2' 12 volt electronic engine air supply kit.

8. WM771 AK20 - 4" 12 volt electronic engine air supply kit.

Item
Part
Number
Quantity
Description
Item
Part Number
Quantity
Description
1
771-01
1
Housing
 
12
728-18
1
Bushing
2
771-02
1
Shaft
 
13
728-28
3
Cap Screw
3
771-03
1
Butterfly
 
14
728-23
1
Breather
4
771-04
1
Bracket
 
15
728-19
1
QR Valve
5
728-05
1
Cylinder
 
16
3325x2
1
Hex Nipple
6
728-07
1
Link
 
17
728-40
1
Hair Clip
7
728-08
1
Clevis Assy.
 
18
728-55
1
Snap Ring
8
728-09A
2
Rivet
 
19
728-29
3
Lock Washer
9
728-09B
2
Collar
 
20
728-35
1
Shaft Nut
10
728-16
3
Seal Ring
 
21
728-36
1
Stop Screw
11
728-17
1
Bushing
 
22
728-37
1
Stop Nut

WM771A Kit Details

Item
Kit Num.
Size
Pipe Kit
Control Kit
Install Kit
Air Kit
Application
1
WM771AK0
2
4.0
902C
532A
736A
2
WM771AK0
4
4.0
902C
901E
3
WM771AK0
6
4.0
902C
736A
xxx
4
WM771AK1
2
5.0
902B
532A
736A
5
WM771AK1
4
5.0
902B
901E
6
WM771AK1
6
5.0
902B
736A
xxx
7
WM771AK1
8
3.5
902E
736B
734A
Dodge
8
WM771AK1
9
4.0
902C
736B
734A
Dodge
9
WM771AK2
0
4.0
902C
736A
734A
Ford
10
WM771AK2
1
4.0
902C
540A
901R
FL50/FL70
11
WM771AK2
3.5
902E
736A
734A
Ford