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FW35 (XA-351) FIFTH WHEEL
Trouble-Shooting Guide
Cause
1. The secondary lock is not released.
2. The tractor may be puttng
pressure against locks (pulling
locks tight against kingpin).
3. Tractor too low
4. Rust or grime build-up on locking
mechanism.
5. Bent kingpin, damaged upper
coupler plate or improper use of
“lube plate.”
6. Bent kingpin, damaged bolster
plate, or improper use of “lube
plate.”
PROBLEM: Difficult to uncouple from trailer
Remedy
1. If manual secondary, pull manual
secondary release handle out and up,
hooking it on casting as shown in
Figure 1.
2. Lock the trailer brakes, then back the
tractor tight against the kingpin to
relieve pressure on the locks. Lock the
tractor brakes. Pull release handle.
3. Raise tractor suspension to proper ride
height.
4. Spray a light lubricant or apply a
lightweight grease on all moving parts
including the cam plate, yoke, lock pins,
and release handle and spring. Operate
several times to work in the lubricant.
Follow recommended lubrication schedule
as detailed in Service Bulletin XL-SB036-01.
5. Check the kingpin and upper plate
coupler as detailed in Holland Service
Bulletin XL-SB020. Remove any improperly
installed or improperly specified lube
plates. Refer to Holland Service Bulletin
XL-SB004-01 for lube plate warnings.
6. Check the kingpin with a Holland
TF-0110 kingin gage and bolster plate
with a 48˝ straight edge – repair or
replace as required (See
Figure 2 below,
and Service Bulletin XL-SB-020.)
Figure 1
38”
.06” MAX.
.25” MAX.
.12” MAX.
19
” R.
10
” R.
90
° ±1°
Figure 2
BOLSTER PLATE
2.875 DIA.
2.000 DIA.
2.815 DIA.
3.312
2.750
1.250
1.375