PI-0815

Service Program
Trucks
Mack Trucks, Inc.
Greensboro, NC USA
SB-10051572-4805
Date
Group
No.
Release
Page
2.2013
652
005
1
1(2)
PI0815, Rear Suspension Hardware Torque
CHU, CXU, GU, TD
PI0815, Rear Suspension Hardware Torque
(February 2013)
It has been discovered on certain Mack trucks that bolts are loose or incorrectly torqued on
the Primaax suspension. The solution is to apply the correct torque from beam to hanger
bolts, torque rod bolts - lateral and fore and aft.
Replacement Procedure
You must read and understand the precautions and guidelines in Service Information,
Group 60, “General Safety Practices, Wheel Suspension and Steering” before performing
this procedure. If you are not properly trained and certified in this procedure, ask your
supervisor for training before you perform it.
W6078959
Note: Verify that rear suspension is at proper ride height before torquing any joints.
1 Transverse TR: 275 ± 25 Nm (203 ± 18 ft-lb)
Both ends of torque rod. Torque front and rear bolts.
2 Fore-aft TR: 320 ± 50 Nm (236 ± 37 ft-lb)
Torque all four locations (8 bolts).
3 Pivot Bolt: 745 ± 35 Nm (550 ± 26 ft-lb)
Torque all four locations (4 bolts).
PV729-PI0815
USA56830
Mack Trucks, Inc.
Service Program
Date
2.2013
Group
No.
Release
652
005
1
Repair Procedure
1 Torque the transverse torque rods (front and rear).
2 Torque the fore and aft torque rods (8 bolts).
3 Check both rear thrust angle alignments and adjust as required. Re-torque fasteners.
Note: If adjustments are required, the upper torque arm mounting bolts will need to be
loosened in conjunction with pivot bolts and nuts in order to achieve proper adjustment
rotation.
4 Torque pivot bolt to specification.
Reimbursement
This repair is covered by an authorized Service Program. Reimbursement is
obtained via the normal claim handling process.
Claim Type (used only when uploading from the Dealer Bus.
Sys.)
B
Recall Status
Vehicle inspected, repair not required
1- Inspected OK
Vehicle repaired per instruction
2- Modified per
instruction
Labor Code
Primary Labor Code
1352H-01-96
1.2 hrs
Time to take charge and determine campaign status
101AA–0A–00 —
0.3 hrs.
Causal Part
20760814
Parts Disposition
Authorization Number
PI0815
Expiration Date
30 SEPTEMBER
2013
Page
2(2)

Service Program
Trucks
Mack Trucks, Inc.
Greensboro, NC USA
This document replaces the entire procedure in PI0815 dated 2.2013.
Date
Group
No.
Release
Page
6.2013
652
005
2
1(3)
SB-10051572-7427
PI0815, Rear Suspension Hardware Torque
LEU, MRU, CHU, CXU, GU, TD
PI0815, Rear Suspension Hardware Torque
(June 2013)
It has been discovered on certain Mack trucks that bolts are loose or incorrectly torqued on
the PRIMAAX suspension. The solution is to apply the correct torque from beam to hanger
bolts, torque rod bolts - lateral and fore and aft.
Repair Procedure
You must read and understand the precautions and guidelines in Service Information,
Group 60, “General Safety Practices, Wheel Suspension and Steering” before performing
this procedure. If you are not properly trained and certified in this procedure, ask your
supervisor for training before you perform it.
W6082541
1 QUIK-ALIGN® Connection: 745± 35 Nm (550 ± 26 ft-lb)
2 Fore-aft Torque Rod: 320 ± 50 Nm (236 ± 37 ft-lb)
3 Transverse Torque Rod (Axle and Frame Connection): 275 ± 25 Nm (203 ± 18 ft-lb)
PV729-PI0815
USA59481
Mack Trucks, Inc.
Service Program
Date
6.2013
Group
No.
Release
652
005
2
Inspect for Indications of a Loose Joint
W6082340
1 Loose joint
Inspect the inside of the frame hanger legs and the QUIK-ALIGN® collars. If any of the
following are present, the pivot bushing and one or more of the mating components may
require replacement:
•
Evidence of wear marks on the inside of the frame hanger legs indicating metal to metal
contact or movement.
•
The snout of the QUIK-ALIGN® concentric or eccentric collar is elongated or damaged.
Check the suspension alignment and adjust if necessary.
Repair Procedure
Quik-Align Pivot Bolt
1 Check both rear thrust angle alignments and adjust as required.
2 Inspect the QUIK-ALIGN® fastener on each support beam assembly for proper torque:
745± 35 Nm (550 ± 26 ft-lb).
3 If the fasteners are loose, inspect the frame hanger and mating components for wear or
damage (see graphic).
4 If the frame hanger or mating components are worn or damaged they must be replaced.
5 Replace any loose fasteners.
Fore-Aft Torque Rod
1 Inspect the two fasteners (torque rod to frame hanger) on each fore-aft torque rod for
proper torque: 320 ± 50 Nm (236 ± 37 ft-lb).
2 If the fasteners are loose, inspect the torque rod and mating components for wear or
damage.
3 If the torque rod or mating components are worn or damaged they should be replaced.
4 Replace any loose fasteners.
Transverse Torque Rod
1 Inspect the four fasteners on each transverse torque rod for proper torque: 275 ± 25 Nm
(203 ± 18 ft-lb).
2 If the fasteners are loose, inspect the torque rod and mating components for wear or
damage.
3 If the torque rod or mating components are worn or damaged they should be replaced.
4 Replace any loose fasteners.
Page
2(3)
Mack Trucks, Inc.
Service Program
Date
6.2013
Group
No.
Release
652
005
2
Reimbursement
This repair is covered by an authorized Service Program. Reimbursement is
obtained via the normal claim handling process.
Claim Type (used only when uploading from the Dealer Bus.
Sys.)
B
Recall Status
Vehicle inspected, repair not required
1- Inspected OK
Vehicle repaired per instruction
2- Modified per
instruction
Labor Code
Primary Labor Code
1352H-01-96
1.2 hrs
Time to take charge and determine campaign status
101AA–0A–00 —
0.3 hrs.
Causal Part
20760814
Parts Disposition
Authorization Number
PI0815
Expiration Date
30 SEPTEMBER
2013
Page
3(3)