Work Instruction
Drum Brake Axles

SB-10057445-4378

Cam Bearing Seal Replacement
These instructions are for the removal and reassembly of
your cam bearing seals at the axle spider on your SAF® axle.
Additional information can also be found in our drum brake
axle service manual document number XL-TA10006OM-en-US
NOTE: Before starting any axle/brake service procedures,
park the trailer on a level surface. Exhaust the air
from the suspension(s), chock the wheels to prevent
the trailer from moving and support the trailer and
axle(s) with safety stands.
Failure to properly support the vehicle and
axles prior to commencing work could
create a crush hazard which, if not avoided,
could result in death or serious injury.
1. R
elease the trailer brakes and cage the spring brakes
according to the spring brake manufacturer’s instructions.
Remove the trailer tires from the axle you will be
performing service on to access the hub and drum.
2. R
emove the drum from the hub using a support device such
as a drum dolly. It will be necessary to retract the brake
shoes to allow the brake drum to clear the brake shoes
during the brake drum removal.
Failure to support weight during installation
or removal of brake drum could create a
crush hazard which, if not avoided, could
result in minor to moderate injury.
3. Unhook both the brake retaining springs from the brake shoes.
4. P ress down on the lower brake shoe to disengage it from
the anchor pin. Move the lower shoe to the side of the
anchor bracket and lift the upper and lower shoes to
remove them.
5. Remove the hub.
6. R
emove the cotter pin that secure the brake adjuster/brake
chamber clevis pin. Remove the clevis pin.
7. R
emove the retaining ring and washer that secure the
brake adjuster to the S-Camshaft.
8. R
emove brake adjuster from cam shaft spline.
9. R
emove the retaining ring from the spider end of the
S-Camshaft.
10. R
emove the S-Camshaft and guide plate by sliding the cam
shaft out of the bearing housing and bearings. It might be
necessary to tap the end of the shaft with a soft mallet to
release it from the bearings.
11. R
emove the cam seals from the brake spider.
12. Install the new cam seals on the bearing housing of the
brake spider.

December 2014
NOTE: Cam seals MUST be installed in the brake spider with
the steel shoulder oriented toward the wheel, and the
rubber wiper oriented toward the center of the vehicle.
This facilitates complete lubrication of the s-cam
bearing while allowing air to purge from the s-cam
bearing away from the brakes (Figure 1).
Figure 1

SPIDER GREASE
SEAL LIPS

INBOARD
SIDE OF
AXLE

RUBBER
WIPER

SPIDER GREASE
SEAL LIPS
STEEL SHOULDER

13. R
einstall guide plate and S-Camshaft by sliding it through
the S-Camshaft bearing in the brake spider. Once through
the brake spider, reinstall the washer and snap ring to the
end of the brake spider. Apply grease to the bearing at the
grease fitting.
14. Apply an even coat of anti-seize compound to the splined
surface of the S-Camshaft.
15. Re-install the brake adjuster.
16. Re-install the hub and add proper lubricant.
17. Re-install the brake shoes.
Failure to control spring pressure during
the brake shoe installation could create a
pinch hazard which, if not avoided, could
result in minor to moderate injury.
18. Re-install the drum to the hub.
Failure to support weight during installation
or removal of brake drum could create a
crush hazard which, if not avoided, could
result in minor to moderate injury.
19. Re-install the tires per manufacturers instructions.
20. Adjust the brakes per manufacturers instructions.

XL-TA20012RM-en-US · 2014-12-01 · Amendments and Errors Reserved · © SAF-HOLLAND, Inc., SAF-HOLLAND, HOLLAND, SAF,
and logos are trademarks of SAF-HOLLAND S.A., SAF-HOLLAND GmbH, and SAF-HOLLAND, Inc.

SAF-HOLLAND Original Parts are the same quality components used
in the original component assembly.
SAF-HOLLAND Original Parts are tested and designed to provide
maximum performance and durability. Will-fits, look-alikes or, worse
yet, counterfeit parts will only limit the performance potential and
could possibly void SAF-HOLLAND’s warranty. Always be sure to spec
SAF-HOLLAND Original Parts when servicing your
SAF-HOLLAND product.

SAF-HOLLAND USA

·

888.396.6501

·

Fax 800.356.3929

www.safholland.us

SAF-HOLLAND CANADA
WESTERN CANADA

·
·

519.537.3494
604.574.7491

·
·

Fax 800.565.7753
Fax 604.574.0244

www.safholland.ca

SAF-HOLLAND MEXICO
www.safholland.com.mx

[email protected]

SAF-HOLLAND USA, INC.
1950 Industrial Blvd., Muskegon, MI 49442
www.safholland.com

· 52.55.5362.8743 · Fax

52.55.5362.8743

XL-TA20012RM-en-US · 2014-12-01 · Amendments and Errors Reserved · © SAF-HOLLAND, Inc., SAF-HOLLAND, HOLLAND, SAF, and logos are trademarks of SAF-HOLLAND S.A., SAF-HOLLAND GmbH, and SAF-HOLLAND, Inc.

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