ARB RD137 User Manual
Page 3

Table of Contents:
1
1 Introduction
3
1.1 Pre-Installation Preparation
3
1.2 Tool-Kit Recommendations
4
2 Removing the Existing Differential
5
2.1 Vehicle Support
5
2.2 Differential Fluid Drain
5
2.3 Removing the Axles and Differential
5
2.4 Marking the Bearing Caps
6
2.5 Checking the Current Backlash Amount
6
2.6 Spreading the Differential Housing
8
3 Bench Measurement
9
3.1 Approximate Backlash Shimming
9
3.2 Calculation & Selection of Shims
11
4 Installing the Air Locker
12
4.1
Installing the Carrier Bearings
12
4.2
Mounting the Ring Gear
12
4.3
Assembling the Seal Housing
13
4.4
Calculation & Selection of Pre-Load Shims
14
4.5
Drilling and Tapping the Bulkhead Port
15
4.6
Modifying the Bearing Cap
16
4.7
Final Air Locker Assembly
17
4.8
Final Backlash Checking
17
4.9
Profiling the Seal Housing Tube
18
4.10 Setting up the Bulkhead Fitting
20
4.11 Bench Testing the Air Locker
21
4.12 Reinstalling the Differential and Axles
22
5 Installing the Air System
23
5.1 Mounting the Solenoid
23
5.2 Running & Securing the Air Line
25
5.3 Connection to the Bulkhead Fitting
26
6 Mounting & Connecting the Electrical System
27
6.1 Mounting the Actuator Switch(es)
27
6.2 Wiring the Actuator System
28
7 Testing & Final Assembly
31
7.1 Leak Testing
31
7.2 Testing the Air Locker Actuation
31
7.3 Filling the Differential
32
7.4 Post-Installation Check List
33
8 Parts List
35
8.1 Exploded Assembly Diagram
35
8.2 Itemized Parts List
36