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XL-FW10009UM-en-US Rev F · 2021-06-16 · 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.
Troubleshooting
POSSIBLE CAUSE
SOLUTION
The tractor may be putting pressure
against the locks.
Lock the trailer brakes and back the tractor tightly against
the kingpin to relieve pressure on the fifth wheel lock. Set the
brakes, then pull the release handle or activate air release.
The tractor is too low.
Raise the tractor suspension to the proper ride height.
The secondary lock is not released.
If equipped with a
manual secondary lock
: pull the release
handle out and up and lock open by hooking the handle on the
top plate casting. If equipped with an
automatic secondary
lock
: inspect for missing or broken parts and repair/replace as
required using the appropriate service kit.
Accumulated rust or grime are interfering
with the lock operation.
Thoroughly clean the fifth wheel and re-lubricate in
accordance with the procedures in Section 12.
The locks are adjusted too tightly.
Check lock adjustments in accordance with the
procedures in Section 14.
The release handle will not stay out or must
be held out when unlocking.
Replace the cam and release handle spring using the
appropriate service kits.
The air cylinder may be dry inside.
Disconnect the air line at the air cylinder and add 2-3
drops of air tool oil. Reconnect and activate air a few
times. (Refer to Section 12 in this manual.)
Missing or damaged release system parts.
The fifth wheel MUST be rebuilt using the appropriate service kit.
The air cylinder tube and/or shaft (on air release-
equipped fifth wheels) may be dented, bent, or
otherwise damaged.
Replace the air cylinder using the appropriate service kit.
The air release system on the tractor is not
functioning properly.
Disconnect the air line at the air cylinder and operate the fifth
wheel manually. If the fifth wheel functions properly, contact
the truck dealer/service for instructions on troubleshooting the
air release control system. The air flow into and out of the air
cylinder should meet a “Coefficient of Velocity” (CV), or Flow
Factor of 0.3 or greater (15 scfm at 80 psi). To ensure proper
product performance, the exhaust flow must be full flow,
non-restrictive/non-clogging, without any component which
will act as a check valve, to ensure free flow-through exhaust
in both directions.
The top plate casting is bent/damaged at the
throat area, restricting movement.
The entire fifth wheel top plate MUST be replaced.
Bent kingpin, damaged upper coupler,
or improper use of lube plates may be
interfering with lock movement.
Check the kingpin and upper coupler plate as detailed in
HOLLAND Service Bulletin XL-SB020. Repair/replace as
required. Remove any improperly installed or improperly
specified lube plates. Refer to HOLLAND Service Bulletin
XL-SB004-01 for lube plate warnings.
Difficult to Uncouple from Trailer:
POSSIBLE CAUSE
SOLUTION
Lack of lubrication on the fifth wheel
top surface.
Lubricate the top of the fifth wheel plate using a high
pressure, lithium-based grease. Follow the recommended
lubrication schedule as described in Section 12.
Warped trailer upper coupler plate.
Check the upper coupler plate for flatness and replace, if
necessary. Refer to HOLLAND Service Bulletin XL-SB020.
Hard Steering or Binding:
