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3 Servicing and testing
3.3
Wear test
Fifth wheel couplings and king pins are subject to more or less wear
depending on the conditions in which they are used, and this wear is
noticeable by play towards the front of the vehicle.
Excessive play causes shocks and may lead to instability on the road and
damage to the fifth wheel coupling, mounting plate, sliders and vehicle
chassis.
JOST fifth wheel couplings have a manual infinite adjustment facility for the
locking mechanism to extend their service lives.
The wear on the king pin must not be compensated by the
adjustment facility.
When the wear limit on the king pin has been reached, it must be replaced.
After replacing the king pin, the locking mechanism must be adjusted again.
Play caused by wear on the king pin should either be accepted if within the
permitted wear limit for the king pin (see figure SK 37-08) or should be
rectified by fitting a new king pin.
JSK 37CX
JSK 37C
30,5 -
33,5 mm
21
JSK 37C / 37CX
3.4
To adjust the locking mechanism
The locking mechanism must be adjusted using a semi-trailer without forced
steering with an unworn king pin as described below:
►
Park the vehicle on flat, firm ground and uncouple the trailer
►
Undo the lock nut (4)
►
Unscrew the adjusting screw (3) by approx. 15 turns
►
Connect the semi-trailer, if necessary lightly tapping the handle (1) in the
closing direction A to bring the locking bar into its limit position
►
Unlock the handle, swing it into position B and hold it there (get an
assistant to hold it)
►
Tighten the adjusting screw (3) again until the handle (1) starts to move
(have your assistant check this)
►
To adjust the recommended basic play of 0.3 mm, tighten the adjusting
screw (3) by a further 11/2 turns and secure it with the lock nut (4)
►
Apply the semi-trailer brake
►
Move off with the tractor and check the maximum play in the locking
mechanism
Note
If the play is still excessive, replace the wearing ring and the lock jaw as
described in the repair manual.
JSK 37C / 37CX
1 Handle
2 Locking
mechanism
3 Adjusting screw
4 Lock nut
5 Lock jaw
6 Locking bar
7 Lever
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