NHTSA ID Number: 10179062
Manufacturer Communication Number: CALFTL32-006
TSB/Document Date: 2020-09-01
Summary
Customer Advisory Letter for Hendrickson
Primaax EX 69,000 lb Tri-Axle Rear Air Suspension Height-Control Valve Relocation. The attached document provides work instructions for relocating the height-control valve downward 1.62 inches (41.3 mm) to prevent the linkage from protruding above the top flange of the frame when the suspension air is dumped.
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TSB/Document ID: CALFTL32-006
Replacement Service Bulletin Number:
MFR Communication Date: 2020-08-17
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL
MFR Component System:
MFR Component Subsystem:
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Daimler Trucks
North America LLC
Customer Advisory Letter
08/17/2020
CAL FTL 32-006
Subject: Hendrickson Primaax EX 69,000 lb
Tri-Axle Rear Air Suspension Height-Control
Valve Relocation
Models Affected: Specific Freightliner M2 vehicles manufactured
between January 1, 2015 and June 4, 2020 equipped with a
Hendrickson Primaaz 69000 lb tri-axle rear air suspension
Our records indicate that you are the owner of certain vehicles, and therefore DTNA has decided to share the
following documentation with you.
The attached document provides work instructions for relocating the height-control valve downward 1.62 inches
(41.3 mm) to prevent the linkage from protruding above the top flange of the frame when the suspension air is
dumped.
We hope you find this information helpful.
Page 1
Daimler Trucks
North America LLC
Customer Advisory Letter
08/17/2020
CAL FTL 32-006
Work Instructions
Subject: Hendrickson Primaax EX 69,000 lb
Tri-Axle Rear Air Suspension Height-Control
Valve Relocation
Models Affected: Specific Freightliner M2 vehicles manufactured
between January 1, 2015 and June 4, 2020 equipped with a
Hendrickson Primaaz EX 69000 lb tri-axle rear air suspension
Work Instructions
1.
Park the vehicle on a level surface, set the parking brakes, and chock the tires.
2.
Put the transmission in neutral and build the air pressure to at least 100 psi. Shut down the engine.
3.
Release the parking brakes.
4.
Locate the height-control valves installed just rear of the mid-axle inside the left-hand and right-hand
frame. See Fig. 1.
Page 2
Daimler Trucks
North America LLC
Customer Advisory Letter
08/17/2020
CAL FTL 32-006
DETAIL A
ISO VIEW
2
3
1
FWD
TOP VIEW
DETAIL A
RH SHOWN
LH OPPOSITE
SIDE VIEW
08/14/2020
1. Linkage
2. Height-Control Valve
4
f321264
3. Fasteners
4. Lower Bracket
Fig. 1, Location of Height-Control Valves
5.
Disconnect the linkage from the lower bracket on both sides of the vehicle.
6.
Pin both height-control valve levers in the neutral position with a 5/32-inch drill bit.
7.
Remove the height-control valve mounting fasteners from the frame and move the valves and linkages
away from the frame.
8.
Mark both the left-hand and right-hand frame rail 1.62 inches (41.3 mm) below the lower existing heightcontrol valve drilling on each rail. See Fig. 2.
Page 3
Daimler Trucks
North America LLC
Customer Advisory Letter
08/17/2020
CAL FTL 32-006
A
1.62"
1.62"
B
08/14/2020
f321265
A. Existing Frame Rail Height-Control Valve Mounting Fastener Holes
B. New Frame Rail Height-Control Valve Mounting
Fastener Hole
Fig. 2, Measuring For the New Frame Rail Holes
NOTE: Protect the air lines and wiring inside the frame when drilling the additional holes.
9.
Drill a 7/16” diameter hole at the frame rail marks.
10.
Install the height-control valves on the lower two holes using the existing 3/8” fasteners.
11.
Install the linkage to the lower bracket by adjusting the rod in the lower rubber adjustment sleeve.
12.
Remove the drill bit pins from the height-control valve levers.
13.
Check the suspension ride height by measuring between the shock mounting bolts. Measure from the centerline of the upper shock bolt to centerline of the lower shock bolt. The distance should equal 20.07
inches (50.98 cm). If necessary, set the suspension height by adjusting the rod in the lower rubber adjustment sleeve to achieve 20.07 inches (50.98 cm). See Fig. 3.
Page 4
Daimler Trucks
North America LLC
Customer Advisory Letter
08/17/2020
CAL FTL 32-006
20.07"
08/14/2020
f321266
Fig. 3, Measuring the Suspension Ride Height
Warranty
This procedure is warrantable only if the described condition exists and the repair is performed within the
applicable base or extended coverage warranty period. If a failure is not found, this procedure is considered
preventive and warranty does not apply.
Normal warranty applies. See Table 1 for OWL VMRS codes and labor allowance information. Enter this CAL
bulletin number in the claim story as you would do for a Service Bulletin warranty claim.
Primary Failed Part
HDR 58525 024
OWL VMRS Codes and Labor Allowance
Component Cause Code SRT Code
Description
Code
016-008-048
01
91C-5010A
BRACKET - LEVELING VALVE
Table 1, OWL VMRS Codes and Labor Allowance
Page 5
Time: Hours
1.4
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