Adjusting Play - Holland GES20 Bedienung-Wartung

3.3 Adjusting play

The locking mechanism of a fifth wheel is subject to a
certain degree of wear, depending on the mileage and
maintenance. The SAF-HOLLAND fifth wheel, type
GES 20 is equipped with a readjustment for
the locking mechanism.
The readjustment is intended to serve as a means of com-
pensating the wear at the locking parts, but not those of
the fifth wheel kingpins.
The readjustment of the locking mechanism must be car-
ried out with an automatically-steered semitrailer with an
unworn fifth wheel kingpin as follows:
• Uncouple the semitrailer train on an even and fixed
base
• Loosen counter nuts
• Unscrew the adjusting screw (SW 24) approx. 15 revo-
lutions
• Couple the semitrailer, if necessary bring the locking
latch into the end position with gentle taps against the
pulling eye
• Unlock the pulling eye, swivel into position and hold
(supervision by assistant)
• Screw in adjusting screw (SW 24) again, until the pull-
ing eye starts to move(supervision by assistant)
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• To set the recommended base play of 0.3 mm,
screw in the adjusting screw a further 11/2 revolu-
tions and secure with counter nut
• Apply the brake of the semitrailer
• Approach with the semitrailer tractor and check the
maximum play in the locking mechanism
If increased play is still given, the wear
ring and locking hook must be replaced in
accordance with the repair instructions.
When adjusting the fifth wheel locking
mechanism, ensure that the fifth wheel
kingpin has a play of minimum 0.3 mm in
the locking mechanism of the fifth wheel.
The locking into place of the safety catch after cou-
pling serves as a locking control. If the locking mech-
anism does not close fully, the adjusting screw must
be screwed in again until the play is correct. If the
play is still too great after adjusting the locking mech-
anism, the locking readjustment is fatigued. The fol-
lowing wearing parts must then be replaced:
1. Wear ring
2. Coupler jaw
If the wear dimensions are reached on the fifth wheel
kingpin (see Section on wear limits), the kingpin must
be replaced.
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