INSTALLATION INSTRUCTIONS Aiea

Hanger and Attaching Parts Kits — Double Slipper Spring Suspension

HAP-161-01 Single Axle Hanger and Attaching Parts Kit
HAP-261-01 Multi Axle Conversion Hanger and Attaching Parts Kit

Safety Precautions

Before welding and installing any suspension component parts to the trailer irame requiring the raising of the
vehicle, make sure that the vehicle is properly supported on lift stands of sufficient capacity. Follow the vehicle
manufacturer's recommendations for lifting and supporting the unit.

Do not lift with or place supports under any part of the suspension system unless specifically directed to do so
during these installation steps.

Safety glasses should be worn at all times
when assembling or disassembting axles
and their components. Failure to comply may
result in serious eye injury.

Never rely on jacks alone to support the
vehicle. A vehicle that is not securely
supported may fall and cause severe injuries
or death.

General Guidelines for Hanger Welding

it is recommended that the hangers be centered on the frame rails.
Starting and stopping at the corners of the hangers is NOT recommended.
Craters/ends of welds should be back-filled to prevent cracking.

. The weld should be inspected for no cracks, no undercut, poor porosity, and inadequate penetration that may
cause the hanger to fail.

Rows

Front Hanger Welding

=>

DEXTER AXLE © Dexter Axte Company 5/15
1 ‘wow. dexteramie com 059-918-00 Rev. A

Center Hanger Welding

Rear Hanger Welding

OPTIONAL
REINFORCEMENT

Cross Frame Reinforcement

Cross frame reinforcement required on front and center hangers, optional on rear hangers, to assure full load
carrying capacity of axle suspension. For reinforcement, use 1.66 OD x .109 wall ASTM A500 Grade B STD
mechanical tubing or 1.25 SCH 40 pipe or better.

Weld completely around reinforcement on the outside of the hangers, ensuring penetration into the hanger side
plates.

Weld (2) .75 long welds on the horizontal centerline of the reinforcement on the inside of the hangers, ensuring
penetration into the hanger side plates as shown in front hanger view.

=>

DEXTER AXLE © Dexter Axle Company 5/15
#: vo desterace com 059-916-00 Rev A

Front Hanger Reinforcement Welding

OOF -B

(Front Hanger Shown)

Typical Inboard Hanger Reinforcement Welds

MD-DSS Axle Hanger Spacing — Single

(3 11/16") 38"

7"Mtg. Ht

(3 7/8")

1. Long hook of spring to rear hanger.
2. Note rear hanger slipper pad orientation.

MD-DSS Axle Hanger Spacing - Tandem

(3 11/16") 431/27 43 1/2"

( 7/8")

1. Long hook of springs to equalizer.
2. Note rear hanger slipper pad orientation.

>

DEXTER AXLE
-3- www dexterave com

© Dexter Axle Company 5/15:
059-918-00 Rev. A

003-4
Heavy Duty Suspension System Axle Alignment

To align a four (4) spring suspension, there is one adjustable track arm (rod) on each axle. These will typically be
on the road (left) side.

Release the clamps at each end of the adjustable rod (Figure 1). Align front axle with the king pin and adjust
each axle thereafter parailel to the front axle. Be sure to secure the clamps on the adjustable track arm (rod) after
alignment (Figure 1).

Alignment Procedure (Figure 1)

Before taking axle alignment measurements, make sure the trailer is unloaded and free the suspension of any
binds by pushing the trailer backwards and then pulling the trailer forward, While pulling the trailer forward on a
level floor, apply the brakes and release. The trailer MUST be level from side to side as well as from front to rear.

Note: Neither service nor parking brakes should be applied during the measurement procedure.

Ensure the king pin is at the correct height. Use axle and extenders (or remove outer wheels and any
obstructions) to achieve a straight line for measuring from king pin to the axle ends/centers.

NA (O)_ 4

Adjust Clamp Bolt / Nut

Adjust Clamp Bolt / Nut
Adjustable Track
Arm (Rod)

Figure 1

Measuring (Figure 2)

1. Lateral Centerline (E). Determine lateral centerline of trailer body and axles by measuring distance E
between trailer and axle centerlines first, and correct so that distance E is “4” or less for each axle.

2. Thrust Angle (A, B). Measure distances A (curbside) then B (roadside) from the king pin to the front of the
axle. These must be equal to within 0.1 degree or ‘” of each other (A = B + ‘s”). Ensure the lateral tension
(pulling force) applied to the measuring tape is the same for both A and B measurements. Use a tensioning
device scale or optical (laser) to ensure accuracy.

3. Scrub Angle {C, D). Measure distances C (curbside) then D (roadside) between axles, measuring from front
of axte extension to front of axle extension (same as center to center). These also must be equal to within Vis"
of each other (C = D + Ys"). This measurement should be as close to zero as possible. The smaller the offset,
the lower the rolling resistance and the better the fuel economy.

>

DEXTER AXLE © Dexter Axle Company 5/15
+ ‘wane derieraxle com 059-918-00 Rev A

OO3-5

Figure 2

Adjusting

1. Loosen the adjustable track rod clamp bolts (Figure 1) and turn the center rod to adjust as necessary (see
torque min/max table).

2. After adjusting, tighten the adjustable track rod clamp nuts (Figure 1) to proper torque (see torque min/max
table) and recheck measurements.
Precautions

1. Always measure to the front axle ends for accurate alignment.

2. Avoid measuring to rims, suspension brackets, hub cap vent holes, brake drums, etc. This can result in
improper alignment. For accurate measurements, use extenders.

3. Always align any succeeding axles with the front axles, not the kingpin.

Heavy Duty Suspension Torque Requirements

Before torquing equalizer bolts, level equalizers parallel
to main frame members. After initial break-in period (up
to 1,000 miles) and at least every 4 months thereafter;
all bolts and nuts should be checked to ensure
recommended torque is being maintained.
Torque Min Torque Max
Description Ft. Lbs. Ft. Lbs.
1¥%-7 UNC Nut
Oiled 565 615
Ory 765 815
1-8 UNC Nut 275 325
Spring Keeper Nut
%-18 UNF 35, 50
Track Rod Clamp Nut
5-18 UNF 130 170
wl © Dexter Axle Company 5/15

Se ‘wow gerteraxie.com 059-918-00 Rev A

0035-6

Serco China
2™¢ Generation part

Easy Identifier, no welds on the back of the
clamping bracket.

Serco China
2™4 Generation part

Spacing between the upper & lower tie rod
adequate and allows clamp to tighten down
‘on tie rod.

Des miele liad. Pye

/

A

03-7

a
Ws

Serco China
24 Generation part

Added |-beam Clamp Stop to stop over
torqueing of clamp bracket.

Added washer headed bolt

Issues:

Need coarse threaded bolt.

005-§

003-4

Serco China |
24 Generation part

issue:

Fine threaded bolts

003-10

Riteada China
1* Generation part

Easy Identifier, small plug weld on the back of
the clamping bracket.

Riteada China
1st Generation part

Spacing between the upper & lower tie rod
to narrow to allow clamp to tighten down on
tie rod completely.

03-1}

Riteada China
1*t Generation part

No I-beam Clamp Stop to stop
over torqueing of clamp.

Fine threaded bolt.

L03-12.

03-13

Riteada China
1st Generation part

Issues:
Nuts not staying torqued

Overall length varying on parts

03-14

Serco India
1st Generation part

Easy Identifier, large plug weld on the back of
the clamping bracket.

Serco India
1%t Generation part

Spacing between the upper & lower tie rod
adequate and allows clamp to tighten down
on tie rod.

OF

Serco India
1%t Generation part

Issues:
No washers

No I-beam Clamp Stap to stop
over torqueing of clamp.

LOPE