6
Servicing and testing
6.1
Servicing instructions
The skid plate on the semi-trailer that engages with the fifth wheel
coupling must meet the following conditions to provide a long service
life and trouble-free function:
Max. 2 mm unevenness
Adequate reinforcement must be assured
Smooth and groove-free surface if possible, without weld
bumps (smooth existing groove burr)
Rounded or chamfered front and side edges
Complete coverage of the fifth wheel coupling support area.
ATTENTION!
Effective lubrication of the top of the fifth wheel coupling
plate (apart from on the W version), the locking mecha-
nism, the pivot bearings (only for the D version) and the
king pin (before using for the first time and after cleaning)
is essential to ensure their long service life. In the W ver-
sion, we recommend applying a thin coat of grease to the
skid plate.
ADVICE!
Before installation, the skid plate must be checked to en-
sure it is even, and the skid plate thickness must also be
checked. The unevenness of the skid plate must be no
more than 2 mm in the load-bearing section of the fifth
wheel coupling. The skid plate must cover the fifth wheel
coupling's set-down surface in every position.
6.1.1 Fifth wheel coupling with manual lubrication
At short intervals, at the latest every 5,000 km:
Uncouple the semi-trailer
Clean the fifth wheel coupling and the skid plate.
Grease the fifth wheel coupling plate, locking mechanism parts
and king pin with high-pressure grease (EP), JOST high-per-
formance lubricant (article no. SKE 013 440 000).
Grease the pivot bearing of version D via the hole on the
top part of the plate (see Figure G50/27) with
paste-like
high-
pressure grease (EP), JOST high-performance lubricant
(article no. SKE 013 440 000).
G50/27
Grease the pivot bearing of ver-
sion D on both sides (lubrication
adapter SKE 013 440 000).
ADVICE!
The pivot bearings on the C and E versions require no
servicing. The grease nipples on the edge of the fifth
wheel coupling plate are only designed for additional
greasing of the locking mechanism between service in-
tervals.
EN
JSK 36 & JSK 37
MUB 002 004 M01
(REV-C)
04-2019
15
JOST IND (REV-A) 06-2019
JSK 39
Summary of Contents for JSK 39
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