Blue Ox Exhaust Brakes

WM781

Blue Ox retarder devices provide downhill retarding horsepower as well as cold weather protection for the 4 stroke engine in both highway and idling modes. This unit is designed to mount in-line and down stream of the turbo or manifold flange. The WM781 is the smaller of the Blue Ox family and will mate with pipe sizes up to 3 1/2" as well as engine displacements up to 470 cubic inches.

Blue Ox wm781

Blue Ox 781 schematic

Complete installation kits include

1. WM781 AK02 - 3 1/2" 12 volt manual type foot operated.

2. WM781 AK04 - 3 1/2" 12 volt automatic type throttle rod actuated.

3. WM781 AK06 - 3 1/2" 12 volt automatic type electronic engine controlled.

4. WM781 AK18 - 3 1/2" 12 volt automatic type electronic engine control.
(with air supply kit)

Item
Part
Number
Quantity
Description
Item
Part Number
Quantity
Description
1
781-01
1
Housing
 
12
728-18
1
Bushing
2
790-02
1
Shaft
 
13
728-28
4
Cap Screw
3
790-03
1
Butterfly
 
14
WM111C
1
Breather
4
160028
1
Bracket
 
15
728-40
1
Hair Clip
5
WM635B3B
1
Cylinder
 
16
728-55
1
Snap Ring
6
728-07
1
Link
 
17
728-29
5
Lock Washer
7
115383
1
Clevis
 
18
728-35
1
Shaft Nut
8
790-09
2
Rivet
 
19
728-36
1
Stop Screw
9
728-09B
2
Collar
 
20
728-37
1
Jam Nut
10
728-16
3
Seal Ring
 
21
115171
1
Pin
11
728-17
1
Bushing
 
22
115159
1
Pin