Spicer DS404 User Manual

Production

Housing P/N On

Production

Brackets Welded

Spicer

®

Axles & Brakes

P/N: SHAIS132

DS404 Housing Cover Weld Reinforcing Instructions

Subject of Instruction Sheet: The procedure below has been created to assist a mechanical technician in the proper

repair of a cracked rear cover weld and the installation of a reinforcement bracket on DS404 housings in Peterbilt vehicles
using an Air Leaf Suspension. This is the only approved method for this repair. Any other method of repair may result in
damage to the axle, axle housing, or other vehicle components and could affect performance and safety. Failure to follow
all steps of this procedure will result in a poor repair and the crack could occur again.

Affected Models: DS404 Drive Housing Used in Peterbilt Air Leaf Suspension Vehicles. See chart below.

Wall

Axle Model

DS404 3/8" (9.5mm) Air Leaf - Before 3/99 319402 Peterbilt
DS404 3/8" (9.5mm) Air Leaf - From 3/99 - 6/00 319954 Dana

Thickness

Reinforcing Bracket Part Number 302527

Suspension Type and

Timing

Tag

By:

Welding Equipment and Specifications:

Mig (wire) Welding

Welding Gas – recommended – 80% Argon, 20% C-O2 Gas Flow Setting – 50-60 cfh.
Wire Size – ER70S-3 or ER70S-6 .035”
First and second passes cover weld, approximate settings – 30 volts, 180 amps.
Third filler pass, cover weld, approximate settings – 26 volts, 140 amps.
Apply three weld passes to the cover and two to the bracket. The first pass should be centered over the fit-up line and
penetrate the failure area. The second pass should be placed slightly above the first. Blend the weld smoothly ( without
significant cross section enlargement ) with the housing and first pass. The third pass should penetrate the lower half of
the second pass to the edge of the housing cover. Avoid any significant overlap of weld or undercut. When making the
second and third passes the weld direction should be reversed. Always start the weld at one end, never in the middle the
intended weld area. See illustrations below for more information.

Arc (stick) Welding

Miller DC type stick welder set at 140 -150 amp setting.
Use E7018 1/8 inch Electrode for all three passes. Note** Remove slag between passes. E7018 rod must be stored in
heated rod oven. Apply three weld passes to the cover and two to the bracket. The first pass should be centered over the
fit-up line and penetrate the failure area. The second pass should be placed slightly above the first. Blend the weld
smoothly ( without significant cross section enlargement ) with the housing and first pass. The third pass should penetrate
the lower half of the second pass to the edge of the housing cover. Avoid any significant overlap of weld or undercut.
When making the second and third passes the weld direction should be reversed. Always start the weld at one end, never
in the middle the intended weld area. See illustrations below for more information. When welding the second and third
passes, reverse the direction of the weld. Never start or stop a weld close to the 12:00 position.

When using an Arc welder you may have to start the weld at the 11:00 position so that you do not run out of electrode at

12:00 Position

the 12:00 position. You can then go back and fill in the ends of the weld area.

Second Pass Direction

First Pass Direction

First Electrode

Weld Direction

Never Start or Stop at 12:00

Repair Instructions:

Important : Before starting, always wear the proper safety equipment for your protection.

1. Disconnect the battery grounds and oil temperature sensor wire. Caution*** If the battery ground is not
disconnected, vehicle electronic control modules may be damaged.

2. Block front and back of steer axle tires.

3. Jack-up driver’s side forward rear drive axle and support with jack stand.

4. Remove driver’s side forward rear drive axle tires and rims only.

5. Remove inter axle driveline.

6. Disconnect and remove tracking rod assembly.

7. For the repair of the cover weld crack, locate the ends of the crack, mark 2 inches either side of the crack. These
marks are ONLY for reference! You must grind until the entire crack is eliminated
inches on either side of the crack.

. Then grind an additional two-

Locate Crack Mark 2” Both Sides of Crack

8. If the cover weld is NOT cracked on the outside of the weld, mark the housing 2 inches either side of the 12:00

Grind Profile

Fit-Up Line

Cover

1/4”

Area To Be

position. Remember these cracks start on the inside of the housing and work their way out. You will need to grind
through the old weld to the fit-up line, this is where the cover meets the axle housing. You should have approximately
¼” of distance between the top of the cover to the bottom of the ground area. The blue dotted lines below represent
the area to be ground.

Housing

Old Weld

Ground

Radius

Cover

12:00 Position

No Crack Outside Of Weld

9. Use a 4 inch angle grinder to grind away the crack. You must grind just below the old weld, down to the fit-up line.
Use the drawing above and the photo below as a guide. It’s very important that you recognize the difference between
the crack and the point where the cover meets the axle housing. Caution*** Be careful to not break completely
through as this will contaminate the axle’s lubricant with grinding material.

Use a wire wheel to remove paint from area to be welded.

Approximate

1/4”

Grind Away Crack Side view of Grind

10. For All Weld Passes Cover Weld – When using a Mig Welder use approximate setting of 30 volts and 180 amps. If
using an Arc welder, use E7018 1/8 inch electrode.

Important** The ground from the welder must be connected to the torque rod bracket. See figure below.

Ground Connection