INSTALLATION GUIDE
RD117
DANA 44, 30 SPLINE, 3.73 & DN
Part No. 2102117
Revision Date 25/03/08
Copyright © 2007 by ARB Corporation Limited
No liability is assumed for damages resulting in the use of the information contained herein.
ARB Air Locker Air Operated Locking Differentials and Air Locker are trademarks of ARB Corporation Limited.
Other product names used herein are for identification purposes only and may be trademarks of their respective owners.
ARB 4x4 ACCESSORIES
Corporate Head Office
42-44 Garden St Tel: +61 (3) 9761 6622
Kilsyth, Victoria Fax: +61 (3) 9761 6807
AUSTRALIA
3137
Australian enquiries sales@arb.com.au
North and South American enquiries sales@arbusa.com
Other international enquiries exports@arb.com.au
www.arb.com.au
Table of Contents:
1 Introduction 3
Pre-Installation Preparation 3
1.1
Tool-Kit Recommendations 4
1.2
2 Removing the Existing Differential 5
Vehicle Support 5
2.1
Differential Fluid Drain 5
2.2
Disconnecting the Axles 6
2.3
Marking the Bearing Caps 6
2.4
Checking the Current Backlash Amount 7
2.5
Removing the Differential Center 8
2.6
3 Installing the Air Locker 10
Insuring Adequate Oil Drainage 10
3.1
Installing the Carrier Bearings 11
3.2
Approximate Backlash Shimming 12
3.3
Mounting the Ring Gear 15
3.4
Drilling and Tapping the Bulkhead Port 16
3.5
Assembling the Seal Housing 17
3.6
Pre-Load Shimming 18
3.7
Reinstalling the Bearing Caps 21
3.8
Checking the Backlash 22
3.9
Setting Up the Bulkhead Fitting 23
3.10
Profiling the Seal Housing Tube 25
3.11
4 Installing the Air System 26
Mounting the Solenoid 26
4.1
Running & Securing the Air Line 28
4.2
Connection to the Bulkhead Fitting 29
4.3
5 Mounting & Connecting the Electrical System 31
Mounting the Actuator Switch(es) 31
5.1
Wiring the Actuator System 32
5.2
6 Testing & Final Assembly 36
Leak Testing 36
6.1
Reinstalling the Axles 36
6.2
Testing the Air Locker Actuation 38
6.3
Re-Sealing & Filling the Differential 38
6.4
Post-Installation Check List 39
6.5
7 Parts List 41
Exploded Assembly Diagram 41
7.1
Itemized Parts List 42
7.2
1
2
1 Introduction
IMPORTANT :
BEFORE ATTEMPTING TO DISMANTLE YOUR VEHICLE FOR THIS
INSTALLATION, PLEASE READ THIS INSTALLATION GUIDE IN ITS
ENTIRETY, AS WELL AS ALL APPLICABLE SECTIONS OF YOUR
VEHICLE MANUFACTURER’S SERVICE MANUAL.
1.1
Pre-Installation Preparation
This booklet is to be used in conjunction with your vehicle
manufacturer’s service manual. ARB endeavors to account for every
possible variation in vehicle model when publishing its installation
guides, and guides are updated regularly as new model information
becomes available, however, the rapid and globally varied release of
some vehicles makes it difficult to insure that your vehicle model has
been accurately accounted for. In the case of any technical
discrepancies between this guide and your service manual, we
strongly advise that you adhere to the specifications and techniques
as documented in your service manual.
Although your ARB Air Locker comes complete with all the step by
step instructions you will need to supplement your vehicle
manufacturer’s service manual and install your new differential, ARB
recommends that you have your Air Locker installed by a trained
professional. Many ARB distributors around the world have been fully
instructed in Air Locker installations by ARB, and have gained a wealth
of experience and skill from years of performing similar installations.
Once you begin this installation your vehicle will be immobile until all
steps of the installation are complete. Make sure your Air Locker kit is
the correct model for your vehicle and that it contains all of the parts
listed on back cover of this booklet. Also be sure you have
appropriately equipped yourself with all the necessary tools, parts, and
materials to complete this installation (see section 1.2 Tool-Kit
Recommendations), and that you have allowed for an appropriate
amount of vehicle down time.
HINT :
Place a
mark inside each of the symbols as
you complete each step. It is very important NOT to
miss any of the steps!
3
1 Introduction
1.2
Tool-Kit Recommendations
Below is a list of tools and supplies you may need to complete this
installation. Requirements for your vehicle may vary. Please consult
your vehicle service manual for additional recommendations.
1.2.1
Tools
Standard automotive sizes (metric and/or imperial) of sockets,
wrenches, Alan keys, and drills.
A dial indicator or other suitable measuring tool for checking ring &
pinion backlash.
A standard automotive feeler gauge.
A razor knife to cut the nylon tubing.
A differential housing spreader, to facilitate removal of the carrier.
(not required on aluminum housings)
A torque wrench. (See vehicle service manual for required torque
range.)
A lubricant drain reservoir.
Suitable measuring tools to measure a differential for pre-load
and/or backlash shimming. (See Section 3.3)
A 11.2mm [7/16”] drill and ¼” NPT tap for bulkhead fitting
installation.
An automotive bearing puller (2 jawed is recommended) or a
differential carrier bearing puller.
A bearing press or arbor press.
1.2.2
Supplies
Thread lubricant/sealant compound for pressure fittings
(e.g., LOCTITE #567 Teflon paste)
Thread locking compound (e.g., LOCTITE #272)
Either a replacement gasket, or gasket sealant, for your differential
cover.
A sufficient volume of differential oil to completely refill your
housing. (see the ARB Air Locker Operating and Service Manual
for recommended lubricants)
A soap and water mixture to test for air leaks.
4
2 Removing the Existing Differential
2.1
Vehicle Support
Safely secure the vehicle on a hoist. We recommend supporting
the vehicle on a chassis hoist to keep the differential area at a
convenient working height and to leave the wheels and axles free
to be rotated and removed.
Once supported off the ground, release the parking brake and
leave the vehicle in neutral. Chock the wheels if necessary.
2.2
Differential Fluid Drain
HINT : This is a good time to check for metal particles in
your oil, on your drain plug, or in the bottom of the
housing which may indicate a worn bearing or
differential component.
Clean around the differential cover plate seal to prevent dirt from
entering the differential.
Position a fluid drain reservoir under the differential and loosen all
differential cover plate retaining bolts.
If a drain plug exists, remove it and completely drain all differential
oil from the housing.
If no drain plug exists then the oil can be drained by loosening the
cover bolts and gently prying the cover away at the bottom until oil
runs out.
HINT : If a drain plug does not exist then it would be a good
idea to drill and tap for a tapered oil drain plug to assist
with future oil changes.
Once drained, remove the differential cover plate.
5
2 Removing the Existing Differential
2.3
Disconnecting the Axles
IMPORTANT :
Collision damage or heavy off-road use of your vehicle in the past may
have resulted in some degree of bending in the axle. Any misalignment
of the axle tubes may result in excessive wear and/or failure of your
differential and axle shafts. ARB strongly recommends that you have
your axle assembly inspected for concentricity and straightness before
installing your Air Locker.
Remove the wheels, and brakes according to your vehicle
manufacturer’s service manual.
Disconnect the drive shaft from the differential drive flange.
Remove both axle shafts according to your vehicle manufacturer’s
service manual.
NOTE : The axle oil seals are delicate and can be easily
damaged. Support the weight of the axle shaft when
drawing them out of their sockets in the housing.
2.4
Marking the Bearing Caps
Using a pointed center punch, gently mark the bearing caps in a
way that will enable you to know which cap is ‘LEFT’ and which cap
is ‘RIGHT’, which way is ‘UP’ and which way is ‘DOWN’. (Fig.1.)
HINT : Many installers choose to make one punch mark on
the left hand side of the left hand bearing cap and one
similar punch mark on the housing at close proximity to
the cap mark. The right hand side is then designated
with two punch marks on the right hand side of the cap
and two similar punch marks on the housing.
Figure 1.
6
2 Removing the Existing Differential
2.5
Checking the Current Backlash Amount
IMPORTANT:
This step is a precautionary measure recommended by ARB due
to the fact that some after market ring and pinion sets have been
manufactured to run with different backlash settings than those
specified by your vehicle manufacturer. Although ARB must
recommend you set backlash according to your service manual
guidelines, we also advise that you compare the backlash
measurements taken here to the recommended backlash settings
in your vehicle service manual. Measurements found to be
outside of your service manual recommendations may indicate
the need to deviate from those settings in order to achieve quiet
running with a good contact mark.
Refer to your vehicle service manual or your local authorized
ARB installer for more information.
Set a depth indicator on one of the ring gear teeth as in figure 2.
Figure 2.
While supporting the pinion gear by holding the drive shaft flange,
rotate the differential in both directions while observing the
maximum variation in depth from the indicator (i.e., the highest
value minus the lowest value). This value is referred to as the ring
and pinion backlash.
Rotate the differential center 90° and measure again for accuracy.
Record the average of all measurements.
7
2 Removing the Existing Differential
2.6
Removing the Differential Center
IMPORTANT:
YOU MUST SPREAD THE HOUSING ON CAST IRON MODELS
Spreading the differential housing with a differential case
spreader is a step which is critical to set up bearing pre-load
on cast iron differential housings (See Figure 3.). Improper
pre-load will result in undue bearing wear, increased stresses
in the differential center, increased running noise, and
ultimately, ring and pinion gear damage.
Remove both bearing caps.
Carefully spread the housing (Fig.3.) enough to remove the
differential center. (Refer to your vehicle’s service manual).
NOTE : Do not spread the housing more than 0.50mm [0.020”].
HINT : Be sure not to mix up the left and right hand bearing
cups. Later it will be necessary to know which cup
came from which side.
Once the housing has been adequately spread, the differential may
be removed by pulling forward on the differential carrier.
Figure 3.
8
2 Removing the Existing Differential
NOTE : The differential center is heavy and quite difficult to
handle when covered in oil. Take care not to drop it.
Relieve any tension on the spreader immediately after the
differential has been removed.
NOTE : Some Dana 44 type differentials now come from the
factory equipped with an OE master shim on the
outside of each bearing cup to setup bearing preload.
This system is used instead of using a shim pack
underneath each bearing cone. Do not mix up which
side of the differential the OE master shims came
from, as they must be re-used on assembly.
9
3 Installing the Air Locker
3.1
Insuring Adequate Oil Drainage
IMPORTANT:
Some Salisbury axles were manufactured with poor oil drainage
between the axle tubes and the differential housing. This can
often result in one of the axle tubes filling up with differential oil
while running. In most cases this will result in a blocked air vent
which will cause the differential housing to pressurize and expel
oil from the axle seals at the wheels or force oil into the air
system of the Air Locker, eventually expelling oil at the solenoid
valve. This is a design flaw which was corrected by most
automakers in the later releases of their axle assemblies. If no
lower drainage point is present in the differential housing then it
is critical that you modify the housing to include one.
Inspect the differential housing for the presence of adequate
drainage in both axle tubes (refer to Fig.4.).
Figure 4.
If no drainage slot is present at the left-hand side (refer to Fig.4.) of
the housing at all, then a slot will have to be created as clearance
for the seal housing tube (Refer to Section 3.8 Reinstalling the
Bearing Caps).
If drainage exists but is inadequate then a slot or hole should be cut
into the housing on the lower side of the tube(s) to allow oil out of
the axle tube area.
10
3 Installing the Air Locker
NOTE : Make sure any grinding dust, filings or drill chips left
behind by cutting the drainage slots is completely
cleaned out of the housing.
Check that the axle air vents are clear and working correctly.
3.2
Installing the Carrier Bearings
Apply a thin film of high pressure grease to both bearing journals of
the Air Locker to prevent seizing.
Using a bearing press or arbor press, press one of the bearing
cones (supplied with the Air Locker kit) onto one bearing journal of
the Air Locker (refer to Figure 5.) until the bearing seats firmly
against the bearing journal shoulder.
Figure 5.
Invert the Air Locker and press the other tapered roller bearing
cone onto the opposite bearing journal of the differential carrier until
the bearing seats firmly against the bearing journal shoulder.
NOTE : Do not add any shims between the bearings and the
bearing seat. Shimming of the Air Locker will be
performed with the supplied shim kits and/or the OE
master shims (if any) on the outside of the carrier
bearings.
11
3 Installing the Air Locker
3.3
Approximate Backlash Shimming
In order to reproduce a similar pre-load and ring and pinion backlash
in your Air Locker to that of your original differential, measurements
need to be taken so that a shim thickness can be calculated.
Secure the original differential to a work bench.
Remove the bolts that hold the ring gear in place.
Using a plastic or copper hammer, tap in a circle around the ring
gear to separate it from the differential carrier.
Figure 6.
Assemble the original bearing cup onto the cone of the right-hand
side of the original differential carrier.
Using a caliper or similarly accurate measurement method
(i.e., able to take accurate measurements within 0.04mm [0.0015”]),
measure the distance from the shoulder of the outer face of the
bearing cup to the ring gear mounting face (shown as ‘A’ in Figure
6.) and record this measurement as ‘A’.
NOTE : Be sure to measure using the bearing cup that
originally came off of the right-hand side.
12
3 Installing the Air Locker
Assemble the new bearing cup and ARB master shim (supplied
with your Air Locker kit) onto the right-hand side of the Air Locker
(as shown in Fig. 7.) and measure the total distance ‘C’.
NOTE : The shim pack ‘B’ should not be installed at this time.
NOTE : The OE master shim (if present) should not be
included in measurement ‘C’.
Figure 7.
Record this measurement as ‘C’.
13
3 Installing the Air Locker
The thickness of the shim pack ‘B’ should make the distance ‘C’ on the
Air Locker closely match the distance ‘A’ on the existing differential
(within 0.1mm [0.004”] ).
Use the following calculation to find the desired thickness of ‘B’:
A – C = B
(Replacement Shim Pac
k)
HINT : If your calculations are correct then the following
equation will also be true:
A – B – C =
ZERO
Select shims from the shim kit supplied with your Air Locker to
make the thickness ‘B’ as determined above.
Place this shim pack between the ARB master shim and the
bearing cup.
Re-measure the new distance ‘C’ from the Air Locker (now
including the shim pack ‘B’) to make sure that it matches ‘A’ on the
original differential.
NOTE : NEVER machine the Air Locker.
14
3 Installing the Air Locker
3.4
Mounting the Ring Gear
IMPORTANT:
Dana 44 ring gears may use either 3/8”, 7/16”, or 1/2” bolts.
For 7/16” bolts re-drill Air Locker flange to 11.5mm [29/64”].
For 1/2” bolts re-drill Air Locker flange to 13.0mm [33/64”].
Apply a thin film of high pressure grease to the ring gear shoulder
of the Air Locker to prevent seizing.
Thoroughly clean any thread locking compound or other foreign
matter from the holes of the ring gear, the threads of the ring gear
bolts, and the mating surfaces between the ring gear and the Air
Locker flange.
HINT : Stoning the ring gear mounting face before installation
will remove any high spots around the threads.
Heat the ring gear to between 80 and 100°C [175 - 212°F] in hot
water or in an oven to slightly expand the gear and facilitate
assembly.
NOTE : NEVER HEAT GEARS WITH A FLAME! This could
damage the hardened surface of the gear and result in
premature wear or failure.
Dry the gear and bolt holes with compressed air (if wet).
Install the ring gear onto the Air Locker by aligning the bolt holes
and then gently tapping it around in a circle with a soft mallet.
Avoid using the bolts to pull down the ring gear as this puts excess
strain on the bolts and the differential flange.
Apply a thread locking compound to the thread of each ring gear
bolt before inserting it. Do not apply threading compound directly
into the threaded hole as this could prevent the bolt from reaching
its full depth.
Tighten the ring gear bolts in a star pattern with a torque wrench
according to your vehicle manufacturer’s specified torque
.
15
3 Installing the Air Locker
3.5
An airline port must be drilled and tapped through the differential
housing to mount the bulkhead fitting into.
Mark a position on the top of the outside shell of the differential
Drilling and Tapping the Bulkhead Port
NOTE : Higher ratio gearing uses deeper (thicker) ring gears
with teeth that extend much further. Make sure the
intended hole location is far enough away from the
ring gear teeth that the air line will not be at risk of
contact with the current or future ring gears.
housing that is about 40mm [1.5”] in from the bolt face where the
inspection cover sits and located as shown in the completed
installation in Figure 8. The bulkhead position must allow the seal
housing tube (assembled at a later time) to be clear of the ring gear
position.
Figure 8.
Cover the drive pinion and axle tube areas with a rag to protect
them from metal filings.
Drill through the housing square to the outside surface using a
11.2mm [7/16”] drill.
Tap the hole from the outside using a ¼” NPT pipe tap.
Remove any sharp edges from the hole that may chip-off and fall
into the housing.
Carefully remove the rags and inspect with a service light inside the
housing to insure no metal filings are left behind.
16
3 Installing the Air Locker
3.6
Assembling the Seal Housing
Make sure the grooves and airway of the seal housing are clean
and free from any contaminants (e.g. water, dirt, metal filings, etc.).
Figure 9.
Inspect the seal housing O-rings (supplied) for dirt, damage or
other conditions which might cause leaks.
Generously lubricate the O-rings with oil prior to assembly, then
insert them into the grooves of the seal housing.
NOTE : When assembling the O-rings, be careful not to leave
them twisted when seated in the grooves as this could
cause excessive wear and leakage.
Lubricate the seal housing running surface on the Air Locker carrier
with oil. Assemble a bearing cup onto the left-hand side of the Air
Locker.
Assemble one of the two ARB master shims (included with the Air
Locker shim kit) onto the stepped face of the seal housing with the
rounded edge of the shim facing out.
NOTE : No shims other than the single ARB master shim
should be assembled onto the seal housing at this
time.
17
3 Installing the Air Locker
Carefully install the seal housing (ARB master shim towards the
center) by sliding it all of the way onto the bearing journal with a
gentle twisting motion. This will allow the O-rings to engage gently.
3.7
Pre-Load Shimming
In order to pre-load the tapered roller bearings in your Air Locker,
measurements need to be taken so that a value can be calculated for
the shim thickness ‘D’ in Figure 9.
IMPORTANT NOTE FOR OE MASTER SHIM TYPE
DANA 44 SETUP:
Grind or cut a notch into the left-hand factory shim as clearance for the
seal housing tube at final assembly, as per Figure 10.
Insert the right hand OE master shim between the ARB master shim
and the axle housing, and the left hand OE master shim between the
seal housing and the axle housing making sure to align the notch with
the notch in the axle housing and the seal housing tube.
All pre-load measurements and any required shimming should be
made between the seal housing and the left hand OE master shim.
Figure 10.
Insert and hold the Air Locker into the differential housing.
Insert the remaining ARB master shim from the Air Locker shim kit
between the right-hand bearing cup and the bearing seat of the
axle housing with the rounded edge of the ARB master shim facing
away from the center.
Insert the shim pack determined earlier as ‘B’ between the bearing
cup (right-hand side) and the ARB master shim.
Push (or lightly pry) the Air Locker hard across to the right-hand
side, and measure the maximum gap (also called the ‘end float’)
between the outside of the seal housing and the inside face of the
axle housing with an automotive feeler gauge. (Fig.11.)
18
3 Installing the Air Locker
Figure 11.
Consult your vehicle manufacturer’s service manual to determine
the carrier bearing pre-load amount specified for your vehicle.
Add the specified pre-load amount to the measurement taken with
the feeler gauge to determine a shim amount for ‘D’ in Figure 9.
PRE-LOAD + END FLOAT = SHIM PACK
Create a shim pack ‘D’ from the shims supplied with your Air
Locker.
NOTE : Do not add shims between the bearing cone and the
Remove the Air Locker from the axle housing.
Install the shim pack ‘D’ between the ARB master shim and the
seal housing as shown in Figure 9.
Spread the differential housing again (Refer to Section 2.6).
Re-install the Air Locker into the axle housing.
NOTE : If the Air Locker is too tight to fully install then the
bearing seat and NEVER machine the Air Locker.
spreader tension may need to be increased. Do not
spread the housing more than 0.50mm [0.020”].
Rotate the seal housing until the tube is positioned in the center of
the oil drainage notch of the axle housing. (Fig.12.)
19
3 Installing the Air Locker
Figure 12.
Release all spreader tension.
Check that some backlash can be felt between the ring and pinion
gears. No backlash would be an early indication of incorrect shim
thickness.
20
3 Installing the Air Locker
3.8
Reinstalling the Bearing Caps
IMPORTANT:
The ARB master shim must be assembled between the stepped
side of the seal housing and the bearing cup.
NOT HAVING THE ARB MASTER SHIM IN PLACE
HERE WILL CAUSE BEARING FAILURE.
Using a soft instrument such as a wooden drift, bend the seal
housing tube outward and away from the position of the bearing
cap. (Fig.13.)
Figure 13.
NOTE : The seal housing tube should lay as low in the seal
housing groove as possible.
Install the bearing caps oriented as they were marked before they
were removed, and tighten the bearing cap bolts. It is not
necessary to torque them down at this time.
Check that some clearance exists between the bearing cap and the
seal housing tube. If not, the bearing cap should be removed and
the tube re-bent for adequate clearance.
Tighten all bearing cap bolts with a torque wrench to the torque
specified in your vehicle manufacturer’s service manual.
NOTE : Aluminum housings require a smaller torque amount
than a cast iron housing. Make sure you use the
correct torque for your vehicle.
21
3 Installing the Air Locker
3.9
Checking the Backlash
Set a depth indicator on one of the ring gear teeth as in
Figure 14.
While supporting the pinion gear by holding the drive shaft, rotate
the differential in both directions while observing the maximum
variation in depth from the indicator (i.e., the highest value minus
the lowest value). This value is referred to as the ring and pinion
backlash.
Rotate the differential center 90° and measure again for accuracy.
Refer to your vehicle service manual for the specified maximum
and minimum amounts of backlash. If the backlash is not within the
specifications then the differential will have to be removed and reshimmed.
Figure 14.
22
3 Installing the Air Locker
3.9.1
NOTE : This step is only necessary when adjusting for
Remove the bearing caps.
Remove the differential as before.
NOTE : Never spread the housing on the aluminum models.
To decrease the amount of backlash, reduce the shim thickness ‘B’
Remount the differential as before.
Release spreader tension (if applicable).
Check backlash again as before.
Re-Shimming the Backlash
incorrect backlash.
(Fig.7.) and increase the shim thickness ‘D’ (Fig.9.) by the same
amount. Reverse this step to increase the backlash.
3.10
Setting Up the Bulkhead Fitting
Apply thread sealant to the threads of the bulkhead body.
Screw the bulkhead body into the tapped hole, and tighten.
Wipe the area clean of any excess thread sealant (inside and
outside of the housing).
Insert the free end of the seal housing tube into the bulkhead fitting
until it protrudes approximately 8mm [5/16”] through the other side.
From the outside of the housing, assemble the small O-ring over
the top of the short length of seal housing protruding through the
bulkhead fitting.
While still holding the seal housing tube into the bulkhead fitting,
insert the small drilled end of the center compression nut over the
extended tube as shown in the assembly diagram (Fig.15.), and
screw it into the bulkhead body, and lightly tighten.
NOTE : Be sure to insert the correct end of the center
compression nut into the bulkhead body. The thread
has been partially relieved on the bulkhead side of the
center compression nut to visually identify its
orientation. (Fig.15.)
23
3 Installing the Air Locker
Figure 15.
NOTE : Excessive tightening of the center compression nut is
not necessary to form a good seal around the tube
and may damage the O-ring, the seal housing tube, or
the threads of the compression nut.
NOTE : Make sure the seal housing tube is all of the way into
the center compression nut while you are tightening
it.
24
3 Installing the Air Locker
3.11
Profiling the Seal Housing Tube
Completely remove the differential spreader.
Without using sharp, jagged tools such as pliers (usually your
hands are the best tool for this job), gently bend the seal housing
tube so that it runs along the inside of the differential housing as
shown in Figure 16.
Figure 16.
NOTE : It is also a good idea to keep the tube away from the
bearing caps or any other part of the differential
casting as any contact due to vibration or shock may
wear the tube and eventually cause a leak.
25
4 Installing the Air System
4.1
Mounting the Solenoid
4.1.1
Connection to an ARB Air Compressor
(Fig.17.)
Remove one of the 1/8” BSP plugs from its port in the compressor
tank.
Apply Teflon paste to the nipple (1/8” X 1/8” BSP) and insert it into
the port and tighten.
Apply Teflon paste to the free end of the nipple.
Assemble the inlet port side of the solenoid (stamped with a ‘1’)
onto the nipple and tighten. The solenoid should be rotated into a
position that does not obstruct any other ports on the compressor
tank.
NOTE : The solenoid exhausts compressed air through the
center of the black retaining cap when the Air Locker
is disengaged. Make sure this orifice cannot be
obstructed.
Apply Teflon paste to the threads of the 5mm push-in fitting and
assemble it into the solenoid outlet port (stamped “2”) and tighten.
ARB
Air Compressor
Figure 17.
26
4 Installing the Air System
4.1.2
For ease of installation, quality of air supply, and a high level of
dependability from your
of a genuine ARB Air Compressor, however, the
can be operated on any alternate air source that meets each of the
following guidelines:
HINT : A good way to insure that you have the necessary
Connection to an Alternate Air Source
Air Locker(s), ARB strongly recommends use
Air Locker air system
Must supply a minimum of 85PSI [586kPa].
The supply must never exceed 105PSI [724kPa].
The Air source should have a tank capacity that enables it to
actuate the Air Locker(s) in one charge so that no hesitation
is experienced when locking one or two differentials.
capacity is to make sure you can engage, disengage,
and then reengage your Air Locker(s) without the air
source having to regenerate (e.g., without the
compressor turning on to refill the tank).
Must supply clean air, free of rust, dirt, water, or other foreign
matter.
Must match the 1/8” BSP porting of the Air Locker solenoid.
Mount solenoid within close proximity of the air supply and secure it
from the effects of vibration and shock.
Connect the air supply to the 1/8” BSP inlet port of the solenoid
(stamped “1” on the solenoid body) using thread sealant.
IMPORTANT :
ARB cannot warrant your Air Locker(s) against damage caused
as a result of using an alternate air supply. If you have any
doubts as to the suitability of your air system to use in an Air
Locker system, consult your ARB distributor.
27
4 Installing the Air System
4.2
Running and Securing the Air Line
The path taken by the air line from your air source (i.e., compressor) to
your
source. Plan ahead carefully when running the air line and always
follow these guidelines:
Account for axle travel when running the line from the axle to a
Avoid leaving large lengths of air line hanging underneath the
HINT : Cable tying the air line to one of your flexible brake
Run the air line all the way from the compressor to the differential
Air Locker is unique to your vehicle and the position of your air
fixed point on the vehicle. Leave enough slack in the air line to
allow for maximum suspension travel in both directions.
(Not necessary on IFS installations)
vehicle where they may get tangled on rocks, sticks, etc.
lines will account for axle travel and should help keep
your line from getting snagged.
before trimming either end of the line to length. This will save
complications that may arise if the air line has to be removed.
Make sure the line does not contact sharp edges or abrasive
surfaces that may damage the air line over time.
Do not run the air line around tight bends which may kink the air
line and restrict or block the air flow.
Keep the air line well away from your vehicle’s exhaust
components. Air lines will melt if subjected to extreme heat.
Do not run more air line than necessary. Excess line volume
created when coiling the left over hose, using unusually large
diameter hose, etc., will increase drain on the compressor tank
resulting in the compressor running more often than needed.
Support the air line by tying it back with cable ties wherever
possible.
At the solenoid end of the air line, always trim the line to length with
a sharp knife to avoid distorting the tube where it plugs into the
push-in fitting.
NOTE : To remove the air line from the push-in fitting; while
holding the flange of the fitting out, push the air line
into the fitting as far as possible, then press the flange
inward, then pull the air line free of the fitting.
28
4 Installing the Air System
To attach the air line to the push-in fitting of the solenoid; insert the
line firmly into the fitting, pull outward on the flange of the fitting
while holding the line as far into the fitting as possible, and then
gently pull outward on the air line to clamp the line in place.
4.3
Connection to the Bulkhead Fitting
In the case of an IFS axle assembly or in the case that the axle
assembly has been completely removed from the vehicle, the
assembly will have to be remounted in order to position the
bulkhead fitting in its correct location for air line access.
Trim the air line to length using a sharp knife.
Insert the support spring over the end of the air line - small end first.
(Fig.18.)
Insert the outer compression nut over the air line.
Insert the 5mm [0.197”] ferrule over the end of the air line. Leave
approx. 5mm of tubing between the ferrule and the end of the tube.
Figure 18.
Insert the support tube all the way into the end of the air line.
29
4 Installing the Air System
HINT : If the support tube is too difficult to insert, place the
end of the air line into a cup of boiled water to soften
the tubing.
Insert the tube end all the way into the center compression nut.
Screw on the outer compression nut and tighten. The ferrule and
support tube are now permanently attached.
Assemble the support spring over the outside of the outer
compression nut.
Secure any loose sections of tube with a cable tie.
30
5 Mounting & Connecting the Electrical System
5.1
Mounting the Actuator Switch(es)
Air Locker actuator switch(es) can be easily panel mounted inside the
vehicle in a 21mm x 36.5mm [0.83” x 1.44”] rectangular cutout.
NOTE : Only attach the cover plate to the face of the switch
once the switch has been mounted and wired correctly
as the cover plates are designed to be difficult to
remove.
For reasons of safety and for ease of operation, the Air Locker
actuator switch(es) should be mounted in a location picked to best suit
the operator. Make sure you have taken the following points into
consideration:
Switch(es) MUST be mounted and should never be allowed to
simply dangle from the wiring loom during vehicle use.
Switch(es) should be within easy reach of the driver. Ideally, any
Air Locker switch should be able to be operated without physical
effort or distraction to the driver.
Switch(es) should be mounted within the line of sight of the driver
so that switch position (‘ON’ or ‘OFF’) can be visually determined
by the rocker position and the illumination state.
The position of the switch(es) should best eliminate any possibility
of accidental operation by the driver or one of the passengers.
Switch cutout position(s) must be located in an area with a
minimum of 50mm [2”] of clearance behind the face of the cutout.
Switch(es) should not be mounted where they will be exposed to
water (e.g., in the lower section of an inner door panel).
ARB recommends that you apply the Air Locker Warning Sticker
(ARB part # 210101) within close visual proximity of the switch
location.
NOTE : If no adequate position can be found on existing
dashboard panels, a surface mounted bracket
(Fig. 19.) may be purchased from your ARB Air Locker
distributor to suit 1, 2, or 3 switches.
31
5 Mounting & Connecting the Electrical System
Figure 19.
5.2
Wiring the Actuator System
5.2.1
Connection to an ARB Air Compressor
When wiring the Air Locker actuator switch(es) and solenoid(s) to an
ARB Air Compressor, all connections can easily be set up directly from
the supplied wiring loom. (Fig. 20.)
NOTE : Refer to your ARB Air Compressor Installation Guide
for details on configuring your installation.
32
5 Mounting & Connecting the Electrical System
ARB AIR COMPRESSOR WIRING LOOM
SWITCH
IDENTIFICATION
TERMINAL
Figure 21.
Figure 20.
UP
33
5 Mounting & Connecting the Electrical System
5.2.2
Connection to an Alternate Air Source
When connecting the actuation switch to an alternate air source, the
switch(es) should be wired according to figures 22. and 23., depending
on whether one or two Air Lockers will be installed in the vehicle.
5.2.2.1
Single Air Locker System
If only one Air Locker is to be installed in the system, the switch and
solenoid should be wired according to figure 22. regardless of
whether the Air Locker has been installed in the front or rear axle of
the vehicle.
Attach the appropriate switch cover (i.e., ‘FRONT’ or ‘REAR’) to
the switch.
NOTE : Refer to Figure 21. for the correct switch terminal
identification and switch orientation.
SINGLE Air Locker SYSTEM
Figure 22.
34
5 Mounting & Connecting the Electrical System
5.2.2.2
Dual Air Locker System
If two Air Lockers are to be installed in the system, ARB
recommends that the switches and solenoids be wired according to
figure 23. For safety reasons, this configuration allows SOLENOID
2 to be actuated only if SOLENOID 1 is already on.
Attach the “REAR AIR LOCKER” switch cover to SWITCH 1, and
the “FRONT AIR LOCKER” switch cover to SWITCH 2.
NOTE : Refer to Figure 21. for the correct switch terminal
identification and switch orientation.
Configure SOLENOID 1 as the air line leading to the rear axle Air
Locker, and SOLENOID 2 as the air line leading to the front axle Air
Locker.
DUAL Air Locker SYSTEM
Figure 23.
35
6 Testing & Final Assembly
6.1
Leak Testing
With the vehicle parked and the engine off, turn the compressor on
and wait until the air system is fully charged.
NOTE : With the Air Locker(s) disengaged, the air source (i.e.,
compressor) should not have to recharge over time.
Intermittent recharging without Air Locker use usually
indicates a leak at the solenoid fittings or at the
Actuate the Air Locker(s).
The compressor should not come on again for a period of at least
15min. Air system recharging within that time period would indicate
that a leak is present in the system.
NOTE : If an alternate air source (e.g., an air cylinder or a belt
If a leak is found to be present, spray a soap and water mixture
onto all air fittings in the system while the compressor is fully
charged. Bubbles should appear at any leak points.
compressor tank O-ring seal.
driven air pump) is used instead of a compressor, the
air system will have to be leak tested with a pressure
gauge and a shut-off valve in series before the
solenoid input.
Check that leaky fittings have been adequately tightened.
Disassemble, clean threads, and reapply thread sealant if leaking
persists.
6.2
Reinstalling the Axles
Insert both axles fully into the housing and gently tap them inward.
NOTE : Be careful not to damage the axle oil seals with the
spline of the axle.
Reconnect the drive shaft to the differential drive flange.
Reassemble the remainder of the differential assembly
(e.g., hubs, brakes, wheels, etc.) to the vehicle according to your
vehicle’s service manual.
36
6 Testing & Final Assembly
6.2.1
Ford IFS (independent front suspension)
NOTE : This section applies to the front differentials of Ford
IFS equipped vehicles only.
The Dana 44 differential supplied on Ford independent front
suspension vehicles manufactured since 1983 utilizes a C-clip to
retain one front axle. When an Air Locker is installed, this C-clip
cannot be reused. Therefore a spring is required to be installed at
the outer end of the axle to prevent the axle from floating out of
engagement with the splines.
Insert an automotive valve spring (or spring of similar strength)
inside the outer yoke - spring loading the slip spline against the
inner end of the stub axle. (Fig.24.)
INNER AXLE
SHAFT
OUTER YOKE
SPLINED
OUTER STUB
Figure 24.
INNER YOKE
SPRING TO BE
FITTED INTO THIS
CAVITY
NOTE : When assembled, ensure that the spring maintains
sufficient pressure on the axle to hold it firmly
against the cross shaft of the differential while the
vehicle is sitting on level ground.
AXLE
37
6 Testing & Final Assembly
6.3
Testing the Air Locker Actuation
To test that your air system, electrical system, and your Air Locker
differential is functioning correctly:
Support the vehicle such that the wheels are free to rotate (e.g., on
axle stands, a chassis hoist, etc.)
Leave the parking brake off, the transmission in neutral, and the Air
Locker switch ‘OFF’.
Turn the ignition to the ‘ON’ position (leaving the motor off). The
large illuminating symbol on the Air Locker switch cover should be
‘OFF’.
Turn the compressor (or alternate air source) on to charge the air
supply up to its maximum pressure.
While supporting the drive shaft flange, rotate one wheel by hand.
The wheel should rotate freely and the opposite wheel should be
turning in the opposite direction without any resistance or
mechanical noise from within the differential.
Turn the Air Locker switch to the ‘ON’ position. The illuminated
symbol on the switch cover should light up.
Rotate the same wheel again.
Both wheels should rotate together.
Turn the switch off again.
Rotate the same wheel.
The wheels should again rotate in opposite directions.
6.4
Re-Sealing & Filling the Differential
NOTE : Consult the ARB Air Locker Operating & Service
Manual for recommendations on differential lubricant
specifications.
Replace the differential cover using gasket sealant or a new
standard differential cover gasket for your make of vehicle.
Refill the differential until level with the filler hole.
Rotate the differential center 2 full turns.
Check the oil level and add oil if necessary.
Replace filler plug (apply thread sealant to filler plug before
inserting if it is a threaded type plug).
Wipe differential housing clean of any oil or grease which may
collect dirt or other abrasive particles.
38
6 Testing & Final Assembly
6.5
Post-Installation Check List
Now that the Air Locker installation has been completed, ARB
recommends that you take the time to complete the following check list
just to insure that you haven’t missed any of the vital steps.
The air system has been leak tested.
Thread locking compound was used on the ring gear bolts.
All torque settings comply with the vehicle manufacturer’s specs
and were set with an accurate torque wrench.
Differential fluid complies with ARB recommendations and has
been filled to the correct level.
All air lines and wiring have been securely cable tied to resist
snagging.
Switch(es) have been securely mounted within operator reach, yet
well away from danger of accidental engagement.
Switch(es) function properly and illuminate to indicate that Air
Locker(s) are engaged.
All operators who are to use the Air Locker have read, and fully
understand the ARB Air Locker Operating & Service Manual.
The Air Locker Warning Sticker has been located within close
proximity of the actuator switch(es).
INSTALLATION PERFORMED BY:
DATE OF INSTALLATION:
ODOMETER READING:
ARB AIR LOCKER SERIAL No:
___________________________
___________________________
___________________________
___________________________
39
6 Parts List
40
7 Parts List
7.1
Exploded Assembly Diagram
(See itemized parts list overleaf)
Figure 25.
41
7 Parts List
7.2
* Not illustrated in exploded view.
Itemized Parts List
(See exploded diagram figure 25.)
AIR LOCKER MODEL No. :
ITEM # QTY DESCRIPTION PART #
01 2 SEAL HOUSING O-RING 160207
02 1 SEAL HOUSING ASSEMBLY 081803
03 2 SHIM KIT SHK009
04 1 BONDED SEAL 160703
05 1 CLUTCH GEAR 050804
06 1 SPIDER BLOCK 070201
07 1 LONG CROSS SHAFT 060204
08 1 SIDE GEAR 131308R
09 2 COUNTERSUNK SCREW 200213
10 3 CROSS SHAFT RETAINING PIN 120601
11 2 TAPERED ROLLER BEARING 160101
12 1 FLANGE CAP ASSEMBLY 027305
13 12 RETURN SPRING 150113
14 1 SPLINED SIDE GEAR 131408R
15 2 SHORT CROSS SHAFT 060403
16 4 PINION GEAR 140701R
17 4 PINION THRUST WASHER 151110
18 2 SIDE GEAR THRUST WASHER 151010
19 1 DIFFERENTIAL CASE 013005
* 1 BULKHEAD KIT,O-RING TYPE,3.5-5mm 170105
* 1 PUSH-IN FITTING,5mm (R1 5 1/8”) 170201
* 1 AIR LINE (5mm DIA X 6m LONG) 170301
* 1 NIPPLE, 1/8” BSP,MALE TO MALE 170501
* 1 SOLENOID VALVE 180103
* 1 ACTUATOR SWITCH 180209
* 1 SWITCH COVER (FRONT) 180210
* 1 SWITCH COVER (REAR) 180211
* 10 CABLE TIE 180301
* 1 WARNING LABEL 210101
* 1 BUMPER STICKER 210102
* 1 OPERATION & SERVICE MANUAL 210200
* 1 INSTALLATION GUIDE 2102117
RD117
42
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