Freightliner Business Class. Manual - part 28

move the driveshaft and have it balanced; see
Group 41 of the

Business Class

Trucks Service

Manual

For driveshafts with slip-joints, check that the
yoke plug is not loose or missing. See

Ref. 2. Replace the yoke plug if needed. If the
yoke plug is missing, the splined shaft may be
hitting the yoke plug and knocking it out; check
the driveshaft for proper length.

41–02 Driveline Lubricating

U-Joint Lubricating

Wipe all old grease and dirt from each U-joint
grease fitting. See

Fig. 4

, Ref. 8.

Use a hand-type grease gun, or a high-pressure
gun with a low-pressure adapter, to lubricate the
U-joints.

NOTE: If a low-pressure adapter is not used
with the high-pressure gun, the U-joints may not
receive enough lubricant.

Using lithium 12 hydroxy stearate grease (NLGI
grade 1 or 2, with EP additives), lubricate until
new grease can be seen at all four U-joint seals.

IMPORTANT: Fresh lubricant must be seen es-
caping from

all four bearing cup seals of each

U-joint.

On full-round yokes, if most of the grease being
added to a U-joint can be seen escaping from
just one of the U-joint seals, bend the tabs of
the lockstrap away from the heads of the bear-

f410012a

05/27/93

Attempt to bend the sleeve yoke and splined shaft back
and forth.

Fig. 2, Slip-Joint Spline Wear Checking

f410110b

06/13/96

A. Measurement: 3" (76 mm)
B. Measurement: 0.015" (0.38 mm)
C. Measurement: 0.020" (0.51 mm)
D. Measurement: 0.025" (0.635 mm)

Fig. 3, Driveshaft Runout Specifications

f410050a

10/20/93

A. After grease appears, cover the pressure-relief hole

while continuing to lubricate.

Slip-Joint Grease
Fitting (with grease
gun attached)

Yoke Plug

Grease

Half-Round Yoke

Yoke Plug Pressure-
Relief Hole

Slip-Joint Seal

Full-Round Yoke

U-Joint Grease Fitting

Fig. 4, Slip-Joint and U-Joint Lubricating

Driveline

Business Class Trucks Maintenance Manual, January 1998

41/3

ing cup capscrews, then check the torque on
the bearing cup capscrews at that seal. Tighten
the bearing cup capscrews as follows:

•

5/16–24 capscrews: 24 lbf·ft (32 N·m)

•

3/8–24 capscrews: 37 lbf·ft (50 N·m)

Bend the lockstrap tabs up, against a flat side of
each capscrew. If the capscrews were already
tight, or all of the U-joint seals still do not purge,
remove the bearing cup at that seal, and exam-
ine the seal for damage. If the seal is damaged,
replace the complete U-joint assembly.

If grease does not appear at one of the seals,
use a screwdriver to pry the U-joint trunnion
away from the non-purging seal, or tap the
driveshaft or yoke with a plastic or rawhide mal-
let (on the side opposite the dry seal), while
continuing to apply gun pressure. If grease still
does not appear, bend the tabs of the lockstrap
away from the heads of the bearing cup cap-
screws, then loosen the bearing cup capscrews
(at the bearing with the dry seal) to relieve seal
tension. Lubricate the U-joint until the old
grease is purged, then tighten the capscrews to
the above specifications, and bend the tabs of
the lockstrap against a flat side of each cap-
screw. If the bearing will not take grease, re-
place the U-joint assembly; see Group 41 of the
Business Class

Trucks Service Manual.

Check the old grease. If it appears rusty, gritty, or
burned, replace the U-joint assembly. See Group
41 of the

Business Class

Trucks Service

Manual

Wipe any excess grease from the seals and
grease fittings.

Slip-Joint Spline Lubricating

Wipe all old grease and dirt from the slip-joint
grease fitting. See

Fig. 4

, Ref. 1.

Use a hand-type grease gun or a high-pressure
gun with a low-pressure adapter, to lubricate the
slip-joint. Using lithium 12 hydroxy stearate
grease (NLGI grade 1 or 2, with EP additives),
lubricate until fresh grease appears at the
pressure-relief hole in the yoke plug. Then cover
the relief hole with your finger, while continuing
to lubricate until fresh grease appears at the slip-

joint seal (

Fig. 4

, Ref. 6). This ensures complete

lubrication of the splines.

Wipe any excess grease from the pressure-relief
hole, slip-joint seal, and grease fitting.

Driveline

Business Class Trucks Maintenance Manual, January 1998

41/4

Title of Maintenance Operation (MOP)

MOP Number

Air Brake Valve Disassembly, Cleaning, and Inspecting, Bendix E–12, QR–1,

R–14, SR–1, ST–3, TC–7, and TP–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–20

Air Brake Valve Inspecting and Leak Checking, Bendix BP–R1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–02

Air Brake Valve Leak Checking, Bendix TC–7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–18

Air Brake Valve Operation Checking, Bendix BP–R1 and E–12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–04

Air Brake Valve Operation Checking, Bendix R–14 and TC–7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–17

Air Dryer Checking, Bendix AD–9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–15

Air Dryer Desiccant Replacing, Bendix AD–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–16

Air Dryer Desiccant Replacing, Meritor WABCO System Saver 1000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–08

Air Dryer Inspecting, Bendix AD–9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–01

Air Reservoir Automatic Drain Valve Disassembly, Cleaning, Inspecting, and

Lubricating, Bendix DV–2

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–19

Automatic Slack Adjuster Checking, Meritor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–12

Automatic Slack Adjuster Inspecting and Adjusting, Gunite. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–25

Automatic Slack Adjuster Inspecting, Meritor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–14

Automatic Slack Adjuster Lubricating, Gunite. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–24

Automatic Slack Adjuster Lubricating, Haldex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–26

Automatic Slack Adjuster Lubricating, Meritor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–13

Brake Chamber Inspecting (All Models). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–07

Brake Lines Checking, Hydraulic Disc Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–22

Brake Lining Wear Checking, Hydraulic Disc Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–21

Camshaft Bracket Bushing Lubricating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–10

Foot Brake Valve Actuator Lubricating, Bendix E–12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–03

Manual Slack Adjuster Lubricating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–11

Meritor Brake Adjusting, Manual Slack Adjusters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–09

Power Booster Checking, Bendix Hydro-Max

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–23

Quick Release and Flipper Valves Checking, Midland . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–06

Relay Valve Checking, Midland. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–05

Brakes

Index, Alphabetical

Business Class Trucks Maintenance Manual, October 1998

42–01 Air Dryer Inspecting,

Bendix AD–9

Check the reservoirs for moisture. A small
amount (teaspoon or less) is normal. Larger
amounts may mean that the desiccant needs to
be replaced. Check the mounting and connecting
lines.

Tighten the fasteners attaching the air dryer to
the vehicle. Use the following torque values.

28 lbf·ft (38 N·m) for SAE grade 5, 3/8–16 fas-
teners.

135 lbf·ft (183 N·m) for SAE grade 5, 5/8–11 fas-
teners.

Check all air lines, fittings, and electrical connec-
tions for damage, leakage, or looseness.

Replace damaged or leaking parts, and tighten
loose fittings or electrical connections.

42–02 Air Brake Valve

Inspecting and Leak
Checking, Bendix BP–R1

Clean the valve exterior and inspect it for corro-
sion and damage.

Inspect the air lines connected to the valve for
signs of wear or damage. Replace the lines as
needed.

Check the valve for leakage.

3.1

Apply the service brakes and hold them
on full line pressure of at least 80 psi
(550 kPa).

3.2

Check the air line fittings for leaks; tighten
or replace the fittings as needed.

3.3

Coat the exhaust port and body of the
valve with soapy water, and check for
leakage. Leakage is excessive if it pro-
duces a 1-inch (25-mm) bubble within 5
seconds.

If the brake valve does not function as
described above, or if leakage is exces-
sive, replace it with a new or remanufac-

tured unit. Repeat the leakage checks
before placing the brake valve in service.

42–03 Foot Brake Valve

Actuator Lubricating,
Bendix E–12

Clean any dirt, gravel, and other foreign debris
from the plunger boot and brake base bracket.

Check the brake plunger boot for cracks, holes,
or deterioration. Replace if necessary.

Lift up the edge of the brake plunger boot and
check the plunger for existing lubrication. If the
plunger is dry, remove it by removing the cotter
pin from the clevis pin and pulling the clevis pin
out. Remove the piston rod and boot. Lift out the
plunger. Lubricate the plunger and the tip of the
piston rod with barium grease part number BW
246671, or Penzoil Adhezoplex EP 2. Install the
piston rod, boot, clevis pin, and cotter pin.

If the plunger has grease on it, lift the edge of
the brake plunger boot enough to apply 2 to 4
drops of light oil around the brake plunger. Do
not over-oil. Install the plunger boot.

Lubricate the clevis pin with light oil.

Check for leakage; see Group 42 of the

Busi-

ness Class

Trucks Service Manual

for instruc-

tions.

42–04 Air Brake Valve

Operation Checking,
Bendix BP–R1 and E–12

Check for proper operation; see Group 42 of the

Business Class

Trucks Service Manual

42–05 Relay Valve Checking,

Midland

Chock the tires. Start the engine and run it long
enough to pressurize the air system to at least 80 psi
(550 kPa), then turn off the engine.

Repeat as necessary, to maintain 80 psi (550 kPa)
pressure during this check.

Brakes

Business Class Trucks Maintenance Manual, October 1998

42/1

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