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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
Attempting to couple too fast.
Couple in accordance with the procedures in Section 7.
The trailer may be too high; the kingpin
is not entering the locks properly.
Lower the trailer in accordance with the manufacturer's instructions.
The locks are closed.
If equipped with a manual secondary lock, pull the secondary release
handle and hook on the top plate casting. Pull the release handle all
the way out. If equipped with air release, set the tractor brakes and
actuate the fifth wheel control valve/switch to open the locks.
The locks could be open even if they still appear closed. Check to make
sure the nut and washer at the front of the fifth wheel are not snug
against the fifth wheel and that the release handle is in the extended
“open” position. If both of these conditions exist, the fifth wheel can
still be coupled. Movement of the kingpin into the fifth wheel lock
jaws will allow them to open and successfully couple.
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 locks may be damaged.
The fifth wheel MUST be rebuilt using the appropriate service kit.
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.)
The release handle may be damaged or bent. Replace the release handle 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 yoke shaft may be damaged or bent
from improper coupling.
The fifth wheel MUST be rebuilt using the appropriate service kit.
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 Couple to Trailer:
18. Troubleshooting
