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SLACK ADJUSTERS
2. Install the large clevis pin through the large holes in the
ASA template and the clevis.
3. Select the hole in the ASA template that matches the
length of the slack adjuster. Hold that hole on the center of
the camshaft.
4. Look through the slot in
the template to see if
the small clevis hole
completely aligns
within the slot.
•
If the small clevis hole
doesn’t align within
the slot:
Adjust the clevis until you
can see the small clevis
pin hole within the slot (right).
5. Verify that the thread engagement between the clevis and
push rod is 0.5” - 0.625” (12.7-15.9 mm).
6. Verify that the push rod does not extend through the clevis
more than 0.125” (3.2 mm).
•
If the push rod extends through the clevis more than 0.125”
(3.2 mm):
Cut the push rod or install a new air chamber
and push rod.
7. Tighten the jam nut against the clevis to the torque
specification below.
NOTE:
Use either the Template Method* or BSAP Method* to
ensure the correct position of welded or threaded clevises
on standard- or long-stroke brake chambers.
* For more information on the Template or BSAP Methods,
refer to Meritor Maintenance Manual 4,
Cam Brake and Automatic Slack Adjusters
. For
information on welded-clevis air brake chambers,
refer to the air brake chamber manufacturer’s maintenance
publication.
T
Threaded
Clevis
Minimum 0.5” (12.7 MM)
Maximum 0.125” (3.2 MM)
Threaded
Clevis
Slot
Camshaft End
TP-4786 ASA template for trucks and tractors with drum brakes with 1.38”
spacing
1
TP-10130 ASA template for trucks and tractors with drum brakes with 1.30”
spacing
1
TP-4787 ASA template for trailers with drum brakes. NOTE: Trailer must always
use 1.38” spacing
1
Thread
Torque
1/2-20
20-30 lb-ft (27-41 N•m)
5/8-18
35-50 lb-ft (48-68 N•m)
SPEC THE RIGHT MERITOR CLEVIS FOR THE APPLICATION
(continued)