MAINTENANCE
6-12 / Axles, Brakes and Suspension
© 2018 Pierce Manufacturing Inc. All Rights Reserved.
IMPORTANT: Pierce Manufacturing does not approve, disapprove, or endorse the use of any aftermarket
or add-on suspension systems, including aftermarket springs. Installation of any such
aftermarket or add-on system is entirely at the discretion and risk of the customer.
Torque the U-bolt nuts (in conjunction with a wheel alignment) after the chassis has been operated for 500 miles or
six months, whichever comes first. Re-torque nuts thereafter every 24,000 miles or annually, whichever comes first.
Torquing Procedure:
1. Clean around the U-bolt to nut joint to remove dirt and grime.
2. Tighten U-bolt nuts evenly in a crisscross pattern.
3. Torque to proper value using a calibrated torque wrench per the following charts.
Table 6-4: U-Bolt Fastener Torque Chart
Replace U-bolts with same size grade 8 U-bolts whenever they are removed. Reinstall using the torquing procedure
noted above. Re-torque after 500 miles of service.
Spring seats, spacers, and shims act to support the spring pack and are important members of the suspension. Any
additional spacers or shims must be selected properly. Upper and lower spring seats and any spacers that are
replaced or added to the suspension assembly must be the same length and width as the original equipment.
Replacing or adding spring seats, spacers, or shims incorrectly may affect spring performance or durability.
6-12.2 Suspension Shackles
Inspect suspension shackle and hanger clamp bolts. Tighten any loose fasteners to the proper values using a
calibrated torque wrench
:
Table 6-5: Clamp Bolt Torque Chart
6-12.3 Spring Pins
Lubricate spring pins with NLGI grade EP2 grease until grease oozes evenly from ends of each pin. If grease will
not flow, raise chassis to remove the load on the springs and apply grease again. If grease will still not flow,
disassemble spring pins and clean or replace as required.
Failure to follow these requirements for torquing and servicing U-bolts and nuts may allow the axle to
shift on the spring pack causing misalignment of the axles.
U-Bolt Diameter
Torque
Ft-Lbs
N-m
3/4”-16
240-260
325-355
7/8”-14
400-420
540-570
1”-14
500-520
680-705
Size
Torque
Ft-Lbs
N-m
3/8”-16
26
35
7/16”-14
42
57
1/2”-13
64
87
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Страница 30: ...SAFETY 2 12 Safety and Responsibility 2018 Pierce Manufacturing Inc All Rights Reserved ...
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