Freightliner Business Class M2. Instruction - page 18

WARNING

Replace all cracked or missing restrictor cans.
Failure to do so could lead to loss of vehicle con-
trol, which could result in property damage, seri-
ous personal injury, or death.

6.

Remove the jack stands, then lower the vehicle.
Check that the spring or driveline brake is ap-
plied, then remove the wheel chocks.

32–02 Suspension Lubricating

Freightliner Spring Front
Suspension

Wipe all dirt from the grease fittings at the forward
spring pin and the spring shackle pins. Then apply
multipurpose chassis grease with a pressure gun
until the old grease is forced out.

Freightliner Spring Rear
Suspension

Single Axle

Lubrication is not required on single-axle spring rear
suspensions.

Tandem Axle

CAUTION

If the equalizer cap and tube assembly is
equipped with a nonrelief grease fitting, excessive
lubrication can damage the bushings.

Lubricate the equalizer cap and tube assembly bush-
ings by applying multipurpose chassis grease at the
pressure relief grease fitting. See

Fig. 8

. Lubricate

with a hand gun or pressure gun until grease is
forced out from the base of the pressure-relief fitting.

Hendrickson Equalizer Beam
End Bushings and Rubber
Center Bushings

No lubrication is required for the equalizer beam end
bushings or equalizer beam rubber center bushings.

Hendrickson Spring Eye Pins,
RT and RTE Series

Apply multipurpose chassis grease at the spring eye
pin grease fitting, located on the inboard side of the
spring eye pin, until clean grease appears at both
ends of the spring eye pin. See

Fig. 6

.

Freightliner TufTrac

The TufTrac suspension is maintenance-free and de-
signed so that lubrication is not required. There are
no provisions for lubrication, and attempting to lubri-
cate the suspension could shorten component life.

32–03 Suspension U-Bolt

Torque Checking

Check the U-bolt torque of both the front and rear
axles where applicable.

CAUTION

Failure to retorque the U-bolt nuts could result in
spring breakage and abnormal tire wear.

1.

Park the vehicle on a flat surface and apply the
parking brakes. Chock the tires to prevent the
vehicle from moving.

2.

Check the U-bolt torque in a diagonal pattern.
Set a click-type torque wrench to the highest
torque value for the fastener being checked. See

320020a

05/27/93

1

1

A

A. Lubricate here.
1.

Cap and Tube Assembly Bushing

Fig. 8, Equalizer Assembly Lubrication

Suspension

32

Business Class M2 Maintenance Manual, August 2015

32/7

Table 1

for U-bolt torque specifications. Turn the

wrench in a clockwise motion (looking up) until
the torque wrench clicks.

Spring Assembly U-Bolt High Nut Torque Values

*

Size

Torque: lbf·ft (N·m)

5/8–18

Stage 1: Hand-tighten
Stage 2: 60 (81)
Stage 3: 200 (271)
Stage 4: 180 to 230 (245 to 313)

3/4–16

Stage 1: Hand-tighten
Stage 2: 60 (81)
Stage 3: 200 (271)
Stage 4: 270 to 330 (367 to 449)

7/8–14

Stage 1: Hand-tighten
Stage 2: 60 (81)
Stage 3: 200 (271)
Stage 4: 420 to 500 (571 to 680)

1–14

Stage 1: Hand-tighten
Stage 2: 60 (81)
Stage 3: 200 (271)
Stage 4: 520 to 600 (707 to 816)

*

Tighten in a diagonal pattern as shown in

Fig. 9

.

Table 1, Spring Assembly U-Bolt High Nut Torque

Values

03/10/2011

f320783

1

2

3

4

Fig. 9, Tightening Pattern for U-Bolt High Nuts

Suspension

32

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32/8

Title of Maintenance Operation (MOP)

MOP Number

All-Axle Alignment Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33–06

Draw Key Nut Torque Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33–03

Kingpin Lubricating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33–01

Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33–00

Tie Rod End Inspecting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33–04

Tie Rod End Lubricating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33–02

Wheel End Inspection and Maintenance, 6,000-Pound and 8,000-Pound Steer

Axles with Oil-Lubricated Hubs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33–05

Front Axle

33

Index, Alphabetical

Business Class M2 Maintenance Manual, August 2015

33–00 Safety Precautions

Safety Precautions in this section apply to all
procedures within this group.

DANGER

When working on the vehicle, shut down the en-
gine, set the parking brake, and chock the tires.
Before working under the vehicle, always place
jack stands under the frame rails to ensure the
vehicle can not drop. Failure to follow these steps
could result in serious personal injury or death.

33–01 Kingpin Lubricating

Detroit

Axles

NOTICE

Use regulated pressure when lubricating the
knuckle assemblies, otherwise damage could re-
sult to the knuckle caps.

1.

Park the vehicle on a level surface, shut down
the engine, and set the parking brake. Chock the
tires. When lubricating upper and lower knuckle
assemblies, do not raise the front axle.

2.

Wipe the fittings clean.

3.

Apply multipurpose chassis grease, NLGI Grade
1 (6% 12-hydroxy lithium stearate grease) or
NLGI Grade 2 (8% 12-hydroxy lithium stearate
grease), until new grease is seen at the junctions
of the axle beam and knuckles. For locations of
grease fittings, see

Fig. 1

; for grease exit points,

see

Fig. 2

.

Sealed and Easy Steer

Kingpins—Axles With Unitized
Wheel Ends

NOTE: This procedure applies to 921, 931, 932,
933, 934, 941, 942, 943, 951, 961, 963, 966,
967, 971, and 975 Series Easy Steer sealed
front axles. Refer to the identification tag on the
front of the axle beam.

On sealed and Easy Steer Plus

front axles, the

grease fittings are on the top and bottom kingpin
caps of the knuckle.

1.

Shut off the engine, apply the brakes, and chock
the rear tires.

06/07/2012

f330272

A

B

1

1

A

Upper View, LH Side

B

Lower View, LH Side

1.

Grease Fitting

Fig. 1, Grease Fittings, Detroit Axles

09/13/2012

f330275

Fig. 2, Kingpin Grease Exit Points, Detroit Axles

Front Axle

33

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