Fifth wheel coupling

JSK 38/50
EN Repair instructions

www.jost-world.com Member of JOST World

 Preface Contents

Fifth wheel couplings are vehicle-connecting parts 1 Safety instructions...................................... 3

that must comply with maximum safety require- 2 Troubleshooting.......................................... 4
ments and also undergo type approval tests.
3 Intended use............................................... 5
Changes or modifications of any kind invalidate any
warranty claims and will lead to the component 3.1 Use....................................................... 5
type approval being forfeited. 4 General....................................................... 6
This repair manual is designed to act as a guide 5 Standard/special tools and auxiliary mate-
to completing repair work on our fifth wheel cou- rials............................................................. 7
plings. The use of JOST spare parts is essential. 5.1 Standard tools..................................... 7
The operation and assembly and the permissible 5.2 Special tools......................................... 7
load data of the fifth wheel coupling are described 5.3 Auxiliary materials............................... 7
in dedicated publications.
6 Repair work................................................ 8
Explanation of symbols 6.1 Preparing the fifth wheel coupling...... 8
6.2 Removing and installing bearing ver-
WARNING! sion JSK 38 C........................................ 8
Means that death, serious physical injury 6.3 Removing and installing bearing ver-
or significant material damage can occur sion JSK 38G........................................ 9
if the relevant safety instructions are not 6.4 Removing and installing bearing ver-
followed. sion JSK 50........................................... 10
6.5 Removing swing arm version JSK 38G.. 11
ATTENTION! 6.6 Installing swing arm version JSK 38G... 11
Means that slight physical injury or mater- 6.7 Removing and installing swing arm
ial damage can occur if the relevant safety bearing version JSK 38G...................... 13
instructions are not followed. 6.8 Removing and installing the lock unit.. 14
6.9 Removing and installing the wear ring. 16
ADVICE! 6.10 Removing and installing the lock jaw... 16
Contains additional important informa- 6.11 Removing and installing the lock......... 17
tion. 6.12 Removing and installing the latch........ 18
6.13 Removing and installing detent ver-
sion JSK 38G........................................ 18
6.14 Adjusting the locking mechanism........ 19
6.15 Wear limit, setting and checking
dimensions........................................... 19
7 Spare parts version JSK 38 C........................ 21
8 Spare parts version JSK 38 G....................... 24
9 Spare parts version JSK 50.......................... 27

JSK 38/50 ZDE 199 003 012 DE • 07-2020 2

1 Safety instructions

The relevant safety regulations in your country (for example Health & Safety at Work in Germany) apply
for working with slider units, fifth wheel couplings, tractor units and semitrailers.
The relevant safety instructions included in the vehicle and semi-trailer's operating instructions must also
be complied with.
The permitted load data and safety information must be complied with during operation and installation.
For maintenance and repair work, the following sections contain safety information that is directly related
to each specific activity. It is essential that you follow this safety information.

ATTENTION!
All welding of cast parts for load-bearing components on equipment for connecting vehicles is
strictly prohibited and will render the type approval void.

JSK 38/50 ZDE 199 003 012 DE • 07-2020 3

2 Troubleshooting

Fault Cause Remedy

Fifth wheel 1 The king pin is too high. 1 The skid plate should be at the same height or max. 50
coupling will mm lower than the fifth wheel coupling.
not close. 2 The skid plate is uneven, 2 Replace the skid plate. Maximum permissible flatness
thus causing the king pin deviation 2 mm.
to be in the wrong posi-
tion.
3 King pin not the correct 3 Replace the king pin.
size or damaged.
4 Lock jaw deformed. 4 Replace lock jaw SK 2405-13 or SK 2405-13Z, and/or
SK 2405-14 or SK 2405-14Z.
5 Poor servicing. 5 Ease the mechanism and grease it.
6 Double spring defective. 6 Replace double spring SK 2405-23.
7 Lever and/or handle 7 Replace/align lever SK 2405-04 and handle SK
buckled. 2405-066.
Fifth wheel 1 Tractor unit not level or 1 Release the fifth wheel coupling's locking mechanism.
coupling can- under tension.
not be opened. 2 Poor servicing, damage 2 The fifth wheel coupling can be opened by force as
to lock jaworlocking bar,, follows:
or locking mechanism Undo locknut of adjusting screw SK 2421-52 and
incorrectly set. screw in the screw (max. 30 Nm) to pretension the
locking mechanism. Swing the handle forward to
release the lock. With the help of a second person on
the opposite side of the fifth wheel coupling, use a
rod (Ø 20 mm and approx. 600 mm long) to knock it
through the hole in the ribbing intended for this pur-
pose and against the tip of the locking bar SK 2405-01
and release the clamp. Next, resolve poor servicing
issues, check wearing parts for damage, repair if nec-
essary and reset the lock.
Fifth wheel 1 Lock jaw deformed. 1 Replace lock SK 2405-27 and hex bolt SK 2421-51.
coupling does 2 Spring defective. 2 Replace spring SK 2106-01.
not stay in the 3 Poor servicing. 3 Ease lock.
ready position.
Fifth wheel 1 Lock deformed. 1 Replace lock SK 2405-27 and hex bolt SK 2421-51.
coupling does 2 Spring defective. 2 Replace spring SK 2106-01.
not stay in 3 Poor servicing 3 Ease lock.
openposition.
Movement 1 Bearing has excessive 1 Version JSK 38 C
between play. Replace upper rubber cushion SK 2006, lower rubber
fifth wheel cushion SK 2007 and hex bolt SK 2421-55 if worn (see
coupling and section 6.2).
semi-trailer Version JSK 38G
(knocking). Replace bearing bush SK 2504-16, spacer SK 2504-14
and spacer SK 1192/1 if worn (see section 6.3). Re-
tighten hex bolt SK 2034.
Version JSK 50
Replace bearing bush SK 2805-03 if worn (see section
6.4). Re-tighten locking screw SK 2521-05.
2 Locking mechanism has 2 Check king pin, replace it if it is worn. If the kingpin is
excessive play. dimensionally stable but still has play, adjust the lock-
ing mechanism (see section 6.14). If this is not suc-
cessful, replace lock jaw SK 2405-13 or SK 2405-13Z
or SK 2405-14 or SK 2405-14Z, wear ring SK 2421-57
or SK 2421-56, locking bar SK 2405-01 and and locking
pin SK 2121-14.

JSK 38/50 ZDE 199 003 012 DE • 07-2020 4

3 Intended use

3.1 Use
JOST fifth wheel couplings are mechanical connecting devices and establish a connection between the
tractor unit and the semi-trailer. They are designed for mounting on a tractor unit.
Fifth wheel couplings, mounting plates and kingpins are vehicle-connecting parts that must comply with
very high safety requirements and must also undergo design approval tests. Modifications of any kind will
render both the warranty and the type approval void and therefore also invalidate the vehicle operating
licence.
JOST fifth wheel couplings are specified to comply with Regulation ECE R55 in class 50 and may be used
solely in conjunction with kingpins of class H50, steering wedges and mounting plates of class J, or com-
parable licensed equipment. The sensors conform to Regulation ECE R10.
JOST fifth wheel couplings are suitable for use in power steering systems.

ADVICE!
Technical modifications reserved.
You can find the latest information at www.jost-world.com

JSK 38/50 ZDE 199 003 012 DE • 07-2020 5

4 General

Conversion work must be carried out by trained personnel in suitable workshops.

Repair work must be carried out using suitable tools and state of the art methods.

Instructions for assembly are indicated by a diamond (◊).

The assembly is in reverse order if not described separately.

The torque values shown in the illustrations are required for the subsequent assembly process.

Clean all parts thoroughly before assembly.

After completing the repair work, the fifth wheel coupling locking mechanism must be greased and its
function tested.

ATTENTION!
The prescribed tightening torques must be adhered to!
Always replace worn, damaged and cracked parts.
Repair welds must not be used.

JSK 38/50 ZDE 199 003 012 DE • 07-2020 6

 5 Standard/special tools and auxiliary materials

5.1 Standard tools

JSK 38C and JSK 50
1/2´´ 1/2´´ 1/2´´ 1/2´´ 1/2´´ 1/2´´ 1/2´´ 1/2´´

Nm 100mm Size 17 Size 18 Size 19 Size 30 Size 8 Size 11

Size 17 Size 17 150mm 200mm

JSK 38G
1/2´´ 1/2´´ 1/2´´ 1/2´´ 1/2´´ 1/2´´ 1/2´´ 1/2´´

Nm 100mm Size 17 Size 18 Size 19 Size 30 Size 8 Size 11

Size 17 Size 17 150mm Diameter 5mm Diameter 12mm 200mm

Ø mm

Ø 94+0.5mm 194.5
95mm 1500gr. 6/8/12mm L= 214mm 104.5 Diameter 70mm

5.2 Special tools

JSK 38C, JSK 38G and JSK 50

Workbench

5.3 Auxiliary materials

We recommend high-pressure grease (EP), e.g. JOST high-performance lubricant (JOST Art. No. SKE 005
670 000).

JSK 38/50 ZDE 199 003 012 DE • 07-2020 7

6 Repair work

6.2 Removing and installing bearing

ATTENTION!
version JSK 38 C
Worn, damaged and cracked parts must
always be replaced. Repair welds must 1
not be used. After completing the repair 1/2´´

work, the entire fifth wheel coupling lock-

ing mechanism must be greased and its
1/2´´
59
350 Nm
function tested. 100mm
1/2´´

With the diagrams the work steps should be car- Size 30

ried out in alphabetical order (e.g. a, b, c). Assem-

bly is carried out correspondingly in reverse order.
Instructions for assembly are identified in the dia-
gram number or in the diagram itself with a dia- JSK38/27
mond ◊. The torque values shown in the illustrations
are required for the subsequent assembly process.
The prescribed tightening torques must be adhered
to! ADVICE!
Before removing the pedestal, check the
6.1 Preparing the fifth wheel cou- bearing for wear (see section 6.15) and
pling cracks.
Disconnect the electrical connection to the trac- Unscrew the hex bolts and washers (59).
torvehicle.
2
1
58

61

JSK38/28

Take off the pedestal (61) and bridge (58).

JSK/45-1

3
ATTENTION! 60
The fifth wheel coupling may only be
raised using suitable lifting gear.
Remove the fifth wheel coupling from the trac-
tor vehicle and place on a suitable surface, e.g.
workbench. Also see the repair instructions for
the fifth wheel coupling in question.
JSK38/29

Take out the upper rubber cushion (60).

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6 Repair work

4 61 2
1/2´´

Nm
60
1/2´´

100mm
1/2´´

Size 30

59 43

57

JSK38/30 JSK38/13

◊ When installing the bearing, make sure that the Pull off the pedestal (43).
arrows on the rubber cushions (60) and (57)
and on the pedestal (61) are pointing in the 41
direction of travel. 3 47
Note the correct tightening torque 45

Install the rubber cushions (57 and 60), pedestal

(61) and bridge (58) using hex bolts with wash-
ers (59).

6.3 Removing and installing bearing

version JSK 38G
JSK38/11
1 43
48 39 41
95mm Take off the O-ring seal (41) and spacer (47).
◊ When the pedestal is installed, the chamfer of
the spacer (47) must be facing the swing arm
(45).

JSK38/10
6/8/12mm
44
46
ADVICE!
Before removing the pedestal, check the
bearing for wear (see section 6.15) and
cracks.
JSK38/49

ATTENTION!
Risk of injury! Unscrew the conical lubricating nipple (46) and
The securing ring (48) is under high pre- knock the parallel grooved pins (44) through to
tension. the inside using a pin punch Ø 12 mm.

Remove the securing ring (48), spacer (39) and

O-ring seal (41).

JSK 38/50 ZDE 199 003 012 DE • 07-2020 9

 6 Repair work

5 8
1500gr.
44
Ø mm

194.5
104.5 Diameter 5mm

Diameter 12mm 46
1500gr.

6-12mm

JSK38/50

Drive out the bearing bush with a pin Diameter 70mm

Ø 104,5 mm. JSK38/34

6 ◊ Drill holes Ø 12 mm in the bearing bush (42) for

installing the new parallel grooved pins (44).
1500gr.

Ø mm
Drive in the parallel grooved pins using a pin
194.5 punch Ø 12 mm. If necessary, grind projecting
parallel grooved pins (44) on the inside using a
104.5

rotor grinder.
43
Drill holes Ø 5 mm in the bearing bush (42) for
installing the conical lubricating nipples (46).
42 Screw in the conical lubricating nipples (46).
JSK38/35
6.4 Removing and installing bearing
◊ Lightly grease the new bearing bush (42) and version JSK 50
carefully drive into the pedestal (43) using the
pin. 1 67
1/2´´

140 Nm
7 1/2´´

3 mm Size 30

1500gr.

Ø mm

104.5
194.5 43 64
150mm

62
JSK38/37
42
JSK38/12
ADVICE!
◊ Before installing the bearing bushes (42), lightly Before removing the pedestal (67), check
grease the inside of the pedestals (43). Drive the bearing for wear (see section 6.15)
the bearing bush (42) 3 mm deep into the and cracks.
pedestal (43). Undo the screws (62) and pull out the plate (64)
with the pin secured underneath.
Take off the pedestal (67).

ADVICE!
Replace the bearing bushes as described
in section 6.3).

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6 Repair work

◊ When the pedestal is installed, the recess must

face outwards. 4
Note the correct tightening torque. 1500gr.

6.5 Removing swing arm version JSK

38G
49
1
1/2´´

1/2´´

Size 30
JSK38/17

Drive out the bearing pin (49).

1500gr.

50
6-12mm

5 39
51
36 JSK38/14

45
ADVICE!
Before removing the swing arm, check the
bearing for wear (see section 6.15) and
cracks.
Lagerböcke ausbauen (siehe Kapitel 6.3). JSK38/51

Release and unscrew the screws (36). Remove

the tab washer (51) and clamping plate (50). Remove the swing arm (45), spacers (39) and O-
ring seals (41).
2
1/2´´
6.6 Installing swing arm version JSK
1/2´´ 38G
1 39
Size 30

36
1500gr.

45
6-12mm

JSK38/15

Release and unscrew the screws (36).

JSK38/18
3
1/2´´

◊ Before installation, lightly grease the inside of

1/2´´
the bearing bushes. The arrow on the swing
Size 30 arm (45) must point in the direction of travel.
40 38 Insert the swing arm (45) in the coupling plate.
Insert spacers (39) between the swing arm (45)
and the swing arm bearing. When inserting the
spacers (39), tilt the swing arm (45) slightly to
prevent the spacers (39) from falling out.
37 JSK38/16

Unscrew the screws (37). Remove the tab wash-

ers (38) and plate (40).

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6 Repair work

2 39 3 45
41 1500gr.

42 49

JSK38/42 JSK38/43

◊ Lightly grease the O-ring seal (41) and insert ◊ Push the bearing pin (49) into the swing arm
between the bearing bush (42) and the spacer (45) by approx. 2/3 of its overall length.
(39). While doing so, insert a flat-blade screwdriver
between the swing arm (45) and the swing arm
bearing as shown, to compensate for the differ-
ence in height.

4 42 39
1500gr.

41

JSK38/44

◊ Lightly grease the second O-ring seal (41) and

insert between the bearing bush (42) and the
spacer (39). Push the bearing pin (49) in fully.

ADVICE!
Alternatively, you can insert the bearing
pin (49) using a tool (pin or pipe with Ø
94+0.5 mm and a length of 214+0.5 mm),
as follows:
Push the tool into the hole in the swing
arm, push on the O-ring seals (41) and
spacers (39). Insert the swing arm (45)
and push in the bearing pin (49) to force
out the tool.

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6 Repair work

◊ Screw on a new tab washer (51) and clamping

5 plate (50) with the screws (36).
1/2´´
140 Nm
1/2´´
6.7 Removing and installing swing
Size 30
arm bearing version JSK 38G
1500gr. 40 38 1
6-12mm
1500gr.
44

37
6-12mm

JSK38/55

◊ Screw on a new tab washer (38) and plate (40)

with the screws (37).
Note the correct tightening torque
JSK38/53

6
1/2´´
160 Nm
Knock the parallel grooved pins (44) inwards
1/2´´
using a Ø 12 mm pin punch.
Size 30
38
2
36
1500gr.

1500gr.
6-12mm

Ø 94+0.5mm
L= 214mm

JSK38/56

◊ Screw in the screws (36) and bend the tab

washer (38) over.
Note the correct tightening torque.
JSK38/52

7
1/2´´ ◊ Drive out the bearing bushes using a Ø 94 mm
pin.
1/2´´

Size 30
3
42
1500gr.
1500gr.

6-12mm
50
Ø 94+0.5mm

51
L= 214mm

36 45
JSK38/57

ATTENTION!
JSK38/54
When installing the clamping plate (50),
tighten the screws (36) until the swing
arm bearing is almost free of play, but can ◊ Lightly grease the new bearing bushes (42) and
still be moved easily. drive them carefully into the swing arm (45)
using the Ø 94 mm pin.
Do not exceed the maximum tightening
torque of 300 Nm.
Secure the screws at both ends by bend-
ing the tab washer (51) over.

JSK 38/50 ZDE 199 003 012 DE • 07-2020 13

6 Repair work

4 6.8 Removing and installing the lock

unit
1500gr.
42
Ø 94+0.5mm 45 1
L= 214mm

150mm

3 mm
27
JSK38/19

◊ Drive the bearing bushes (42) 3 mm deep into

the swing arm (45) on both sides. JSK38/24

5 44 Unhook the double spring (27).

2 19
1/2´´

Diameter 12mm

1/2´´

1500gr.
Size 17
1/2´´

30
6-12mm
Size 19

46 Nm
Size 17

Diameter 70mm
74 Nm
JSK38/36 29
JSK38/25

◊ Drill Ø 12 mm holes in the bearing bush for

installing the new parallel grooved pins (44). Unscrew the screws (30) and screw connections
Drive in the parallel grooved pins (44) using a Ø (19). Lift off the bearing (29).
12 mm pin punch. ◊ Note the correct tightening torques.
If necessary, grind projecting parallel grooved
pins (44) on the inside using a rotor grinder. 3 28
34
26

JSK38/26

Turn the lock unit to the side and pull out in the
direction of the arrow.
◊ When installing the lock unit, lubricate all mov-
ing parts. Adjust the locking mechanism as
described in section 6.14.

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6 Repair work

4
10
34

25 26
32
31
33

28

JSK38/40

10 Latch holder
25 Locking pin (complete)
26 Locking bar
28 Lever
31 Washer
32 Spring loop
33 Hex bolt (complete)
34 Handle

JSK 38/50 ZDE 199 003 012 DE • 07-2020 15

6 Repair work

6.9 Removing and installing the wear

ADVICE!
ring
If the lock jaw is worn or the coupling
1 locking mechanism is being replaced,
1/2´´
80 Nm swap the 2” lock jaw on the vehicle for a
3.5” version (or vice versa) (pay attention
to the legal requirements).
1/2´´

Nm

Removing the wear ring (see section 6.9).

1/2´´

Size 8
1

ATTENTION!
Danger of crushing!
Secure the handle so it cannot inadver-
JSK38/03
tently lock.
Pull out the handle and secure with a screw-
ADVICE! driver as shown.
If the wear ring is worn or the coupling
locking mechanism is being replaced, 2 20
swap the 2” wear ring on the vehicle for a
3.5” version (or vice versa).
Unscrew the hexagon screws (1).
◊ Note the correct tightening torque.

2
2
JSK38/01

Release the spring (20).

3
24

JSK38/04

Lever out the wear ring (2) with a tyre lever.

6.10 Removing and installing the lock

jaw
JSK38/05
1
Remove the pin (24).

JSK38/02

JSK 38/50 ZDE 199 003 012 DE • 07-2020 16

 6 Repair work

4 6.11 Removing and installing the lock

1
6

JSK38/06

20
JSK38/22
Versions with centralised lubrication system only
Undo the cable tie (6).
ADVICE!
5 Before removing the lock, check it for
wear/deformation (see section 6.15).
Size 11

Release the spring (20).

Size 17

JSK38/07

Versions with centralised lubrication system only

Unscrew the connection.
◊ When installing, tighten the sleeve nut until fin-
ger-tight, then tighten 1.5 to 2 more revolu-
tions.

6
23

JSK38/08

All versions
Remove the lock jaw (23) as shown.
◊ Before installing the lock jaw (23), check its
degree of wear (see section 6.15).

JSK 38/50 ZDE 199 003 012 DE • 07-2020 17

6 Repair work

2 6.13 Removing and installing detent

1/2´´
version JSK 38G
1
1/2´´

Size 17 1/2´´

22 1/2´´ 19
80 Nm
Nm
1/2´´

21 100mm
1/2´´

JSK38/23 Size 18
15

Unscrew the screw connection (21) and remove JSK38/46

the lock (22).
◊ Tighten the lock of the screw connection (21) Unscrew the screw connection (19) and remove
only until it touches the mating surface. the locking piece (15).
The lock (22) must allow itself to be tilted ◊ When installing the locking piece (15), make
slightly and must not be jammed in place. sure the spring washers of the screw connec-
tion (19) are installed as shown in the diagram.
6.12 Removing and installing the latch Note the correct tightening torque.
1
1/2´´ 2
1/2´´
30 Nm 1500gr.

Nm
1/2´´ 6-12mm

Size 17

13 17
Size 17

14
JSK38/38
JSK38/20

Unscrew the screw connection (14) and remove

the latch (13). Drive out the dowel pins (17).
◊ Note the correct tightening torque.
3
18

16

JSK38/21

Take off the detent piece (18) and springs (16).

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6 Repair work

6.14 Adjusting the locking mechanism 2 2" - 57.5 - 56.0 mm

1 150mm
3.5" - 37.0 - 35.5 mm
1/2´´

1/2´´
34
Size 17

Size 17

33 JSK38/59

JSK38/31
When the wear limit is reached, replace the 2”
or 3.5” wear ring.
ADVICE! Bearing play of JSK 38C
The kingpin must have minimum horizon- 14 mm maximum vertical and horizontal play.
tal play of 0.3 mm in the locking mecha-
nism. At a height of 160 mm, maximum vertical play is lim-
ited to 10 mm.
Adjust the locking mechanism with a dimen- If play exceeds this, replace the rubber cushion.
sionally stable kingpin with maximum overall
wear of 0.25 mm.
Secure the locking mechanism and undo the Bearing play of JSK 38G
lock nut of the screw connection (33). Unscrew 4 mm maximum vertical play at the pedestals and 4
the screw connection (33) until it is no longer in mm maximum in the swing arm bearing.
contact.
Move the locking bar into its end position by If play exceeds this, replace the bearing bushes.
gently knocking the handle (34) in the closing 3 mm maximum horizontal play in the swing arm
direction. Reconnect the semi-trailer. bearing.
Screw in the screw connection (33) until the
handle (34) starts to move. If play exceeds this, replace the spacers and clamp-
When it does, screw the screw connection (33) ing plate.
in approx. one revolution (one revolution gives
play of 0.3 mm). Bearing play of JSK 50
Fasten the lock nut of the screw connection
(33). 4 mm maximum vertical play at the pedestals.
If play exceeds this, replace the bearing bushes.
6.15 Wear limit, setting and checking
dimensions
1
150mm

2" - 57.1- 55.1 mm

3.5" - 38.0- 36.0 mm

JSK38/33

When the wear limit is reached, replace the 2”

or 3.5” lock jaw.

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6 Repair work

3 5
150mm

2" - 73 - 71 mm
3.5" - 114 - 112 mm

2" - 84 - 82.5 mm
3.5" - 74 - 72 mm
65 mm
2" - 50.8- 49mm
3.5" - 89.0- 86mm

JSK38/32

JSK38/60

Checking dimension of the lock

When the wear limit is reached, replace the 2” The checking dimension must be 65 mm in the open
or 3.5” kingpin. position, i.e. handle pulled out to end position and
lock engaged in the locking bar.
ADVICE!
The flatness deviation of the skid plate
must not exceed 2 mm.

4 B 5 mm

D
C
50 mm

50 mm

A 8 mm
JSK38/61

Wear check of the coupling plate

ADVICE!
To determine material wear, use the ruler
(D) to assist with measurement.
On the outside (A), material wear up to approx. 8
mm is permitted, i.e. approx. 3 mm deeper than the
lubricating groove (C).
In the bearing zone (B), maximum wear to the depth
of the lubricating groove is permitted at any point.

JSK 38/50 ZDE 199 003 012 DE • 07-2020 20

7 Spare parts version JSK 38 C

1 4
2
3
6
60 5

9
61

11
12
8
57 20
20 24
23 10 13
14
58
59 26
32 34 55
21 22 31
28 53
33 25
29 54
27
30 56

JSK38C_explo

Item Designation Serial no./ Article number Quantity

remarks per JSK
1 Cheese-head screw SK 2421-08 1
2 Wear ring 3.5”, complete with item SK 2421-56 1
1 SK 2421-57 1
Wear ring 2”, complete with item 1
3 Screw connection SK 1976 1
4 Lubricant pipe SK 2205-12 1
5 Lubricant line, complete with item for type Z SK 2408-02 1
6
6 Cable tie SK 3121-13 1
8 Hex bolt, complete SK 2421-50 2
9 Carabiner, complete up to xx60xxxxxx SK 1436 1
10 Latch holder, complete with item from xx63xxxxxx SK 2405-084 1
11
11 Clamping pin 000,003,027 1
12 Spring loop with spacer tube from xx63xxxxxx SK 2921-30 1
13 Latch, complete from xx63xxxxxx SK 3121-52 1
14 Hex bolt, complete from xx63xxxxxx SK 3521-03 1
20 Spring SK 2106-01 2
21 Hex bolt, complete SK 2421-51 1
22 Lock SK 2405-27 1
23 Lock jaw 3.5” SK 2405-14 1
Lock jaw, complete with item 6 3.5” for type Z SK 2405-14Z 1
Lock jaw 2” SK2405-13 1
Lock jaw, complete with item 6 2” for type Z SK 2405-13Z 1

JSK 38/50 ZDE 199 003 012 DE • 07-2020 21

7 Spare parts version JSK 38 C

Item Designation Serial no./ Article number Quantity

remarks per JSK
24 Bolt SK 2405-18 1
25 Locking pin, complete SK 2121-14 1
26 Locking bar SK 2405-01 1
27 Double spring SK 2405-23 1
28 Lever SK 2405-04 1
29 Bearing SK 2405-15 1
30 Hex bolt, complete SK 2421-53 2
31 Washer SK 2405-19 1
32 Spring loop SK 2405-09 1
33 Hex bolt, complete SK 2421-52 1
34 Handle (standard version) SK 2405-066 1
53 Safety lever for type J from xx63xxxxxx SK 2405-067 1
54 Hex bolt, complete for type J from xx63xxxxxx SK 2421-50 1
55 Wire cable, complete for type J from xx63xxxxxx SK 3521-02 1
56 Handle for type J from xx63xxxxxx SK 3105-113 1
57 Rubber cushion, bottom SK 2007 2
58 Bridge SK 2005 2
59 Hex bolt, complete SK 2421-55 8
60 Rubber cushion, top SK 2006 2
61 Pedestal BH 190 SK 2404-01 2
Pedestal BH 250 SK 2404-04 2

JSK 38/50 ZDE 199 003 012 DE • 07-2020 22

7 Spare parts version JSK 38 C

Item Repair kits Article no. for type C Article no. for type CZ
1, 2, 5, 9, Repair kit for 3.5” locking mecha-
20, 23, SK 2421-76 SK 2421-76Z
nism
24, 27
1, 2, 5, 9, Repair kit for 2” locking mecha-
20, 23, SK 2421-77 SK 2421-77Z
nism
24, 27
57, 58, Repair kit for bearing SK 2421-78 SK 2421-78
60

Item Conversion/retrofit kits Article no. for type C Article no. for type CZ
1, 2, 20, Conversion kit for swapping 3.5” SK 2421-98 SK 2421-98Z
23 locking mechanism for 2” version
1, 2, 20, Conversion kit for swapping 2” SK 2421-99 SK 2421-99Z
23 locking mechanism for 3.5” version
35, 54, Retrofit kit for handle extension, SK 3121-063 SK 3121-063
55 complete

JSK 38/50 ZDE 199 003 012 DE • 07-2020 23

8 Spare parts version JSK 38 G

20 1
2 4 3
6
5
48
21
50 51 22
44 39
46 52 41 55
42
11
28 10
33 12
29 8 9
47 30 27 15 13
19 14
16 32
31
45 20 34
46 26 18
49 17
25 24 53
43 23 54
40
36 38
37 56
JSK38G_explo

Item Designation Serial no./ Article number Amount

remarks per JSK
1 Cylinder screw SK 2421-08 1
2 Wear ring 3.5”, complete with item SK 2421-56 1
1 SK 2421-57 1
Wear ring 2”, complete with item 1
3 Screw connection SK 1976 1
4 Lubricant pipe SK 1989 1
5 Lubricant line, complete with item for type Z SK 2508-02 1
6
6 Cable tie SK 3121-13 1
8 Hex bolt, complete SK 2421-50 2
9 Carabiner, complete up to xx70xxxxxx SK 1436 1
10 Latch holder, complete with item from xx72xxxxxx SK 2405-084 1
11
11 Clamping pin 000,003,027 1
12 Spring loop with spacer tube from xx72xxxxxx SK 2921-30 1
13 Latch, complete from xx72xxxxxx SK 3121-52 1
14 Hex bolt, complete from xx72xxxxxx SK 3521-03 1
15 Locking piece, complete SK 2506-22 2
16 Spring SK 2506-15 4
17 Dowel pin SK 2521-10 4
18 Detent piece SK 2506-35 2
19 Hex bolt, complete SK 2521-50 4
20 Spring SK 2106-01 2

JSK 38/50 ZDE 199 003 012 DE • 07-2020 24

8 Spare parts version JSK 38 G

Item Designation Serial no./ Article number Amount

remarks per JSK
21 Hex bolt, complete SK 2421-51 1
22 Lock SK 2405-27 1
23 Lock jaw 3.5” SK 2405-14 1
Lock jaw, complete with item 6 3.5” for type Z SK 2405-14Z 1
Lock jaw 2” SK2405-13 1
Lock jaw, complete with item 6 2” for type Z SK 2405-13Z 1
24 Bolt SK 2405-18 1
25 Locking pin, complete SK 2121-14 1
26 Locking bar SK 2405-01 1
27 Double spring SK 2405-23 1
28 Lever SK 2405-04 1
29 Bearing SK 2405-15 1
30 Hex bolt, complete SK 2421-53 2
31 Washer SK 2405-19 1
32 Spring loop SK 2405-09 1
33 Hex bolt, complete SK 2421-52 1
34 Handle (standard version) SK 2405-066 1
36 Hexagon screw SK 2034 4
37 Hexagon screw SK 2521-18 2
38 Tab washer SK 2504-21 2
39 Spacer SK 2504-14 4
40 Plate SK 2504-18 1
41 O-ring seal SK 2521-07 63
42 Bearing bush Plastic POM SK 2504-16 4
43 Pedestal, with items 42, 44, 46 SK 2521-52 2
44 Parallel grooved pin SK 1533 8
45 Swing arm, complete with items SK 2521-51 1
42, 44, 46, 52
46 Conical lubricating nipple SK 2521-04 6
47 Spacer SK 1192/1 2
48 Securing ring SK 1435 2
49 Locating pin SK 2504-17 1
50 Clamping plate SK 2504-19 1
51 Tab washer SK 2504-20 1
52 Conical lubricating nipple with SK 2521-57 1
extension
53 Safety lever for type J from xx72xxxxxx SK 2405-067 1
54 Hex bolt, complete for type J from xx72xxxxxx SK 2421-50 1
55 Wire cable, complete for type J from xx72xxxxxx SK 3521-02 1

JSK 38/50 ZDE 199 003 012 DE • 07-2020 25

8 Spare parts version JSK 38 G

Item Designation Serial no./ Article number Amount

remarks per JSK
56 Handle for type J from xx72xxxxxx SK 3105-113 1

Item Repair kits Article no. for type C Article no. for type CZ
1, 2, 5, 9, Repair kit for 3.5” locking mecha-
20, 23, SK 2421-76 SK 2421-76Z
nism
24, 27
1, 2, 5, 9, Repair kit for 2” locking mecha-
20, 23, SK 2421-77 SK 2421-77Z
nism
24, 27
36, 37,
38, 41,
42, 44, Repair kit for bearing SK 2521-76 SK 2521-76Z
46, 51,
52

Item Conversion/retrofit kits Article no. for type C Article no. for type CZ
1, 2, 20, Conversion kit for swapping 3.5” SK 2421-98 SK 2421-98Z
23 locking mechanism for 2” version
1, 2, 20, Conversion kit for swapping 2” SK 2421-99 SK 2421-99Z
23 locking mechanism for 3.5” version
35, 54, Retrofit kit for handle extension, SK 3121-063 SK 3121-063
55 complete

JSK 38/50 ZDE 199 003 012 DE • 07-2020 26

9 Spare parts version JSK 50

1
2
3
6
5

20 55
22
62
64
65 28 11 9
21
33 24 12
67
29 20 8
27
23 10 13 14
44 30
66 32
31
10
26
25 34
54
56

63
JSK50_explo

Item Designation Serial no./ Article number Quantity

remarks per JSK
1 Cheese-head screw SK 2421-08 1
2 Wear ring, complete with item 1 3.5” SK 2421-56 1
3 Screw connection SK 1976 1
4 Lubricant pipe SK 1989-003 1
5 Lubricant line, complete with item SK 2508-02 1
6
6 Cable tie SK 3121-13 1
7 Guide plate up to xx90xxxxxx SK 2405-22 1
8 Hex bolt, complete SK 2421-50 2
9 Carabiner, complete SK 1436 1
10 Latch holder, complete with item from xx91xxxxxx SK 2405-084 1
11
11 Clamping pin 000,003,027 1
12 Spring loop with spacer tube from xx91xxxxxx SK 2921-30 1
13 Latch, complete from xx91xxxxxx SK 3121-52 1
14 Hex bolt, complete from xx91xxxxxx SK 3521-03 1
20 Spring SK 2106-01 2
21 Hex bolt, complete SK 2421-51 1
22 Lock SK 2405-27 1
23 Lock jaw 3.5” SK 2405-14 1

JSK 38/50 ZDE 199 003 012 DE • 07-2020 27

9 Spare parts version JSK 50

Item Designation Serial no./ Article number Quantity

remarks per JSK
24 Bolt SK 2405-18 1
25 Locking pin, complete SK 2121-14 1
26 Locking bar SK 2405-01 1
27 Double spring SK 2405-23 1
28 Lever SK 2405-04 1
29 Bearing SK 2405-15 1
30 Hex bolt, complete SK 2421-53 2
31 Washer SK 2405-19 1
32 Spring loop SK 2405-09 1
33 Hex bolt, complete SK 2421-52 1
34 Handle SK 2405-066 1
44 Parallel grooved pin SK 1533 8
54 Hex bolt, complete for type J from xx72xxxxxx SK 2421-50 1
55 Wire cable, complete for type J from xx72xxxxxx SK 3521-02 1
56 Handle for type J from xx72xxxxxx SK 3105-113 1
62 Locking screw SK 2521-05 8
63 Grease nipple SK 2521-04 2
64 Plate SK 2805-02 2
65 Bearing pin SK 2805-01 2
66 Bearing bush Plastic POM SK 2805-03 4
67 Pedestal, complete with items 44, SK 2821-51 2
66

JSK 38/50 ZDE 199 003 012 DE • 07-2020 28

9 Spare parts version JSK 50

Item Repair kits Article no. for type C Article no. for type CZ
1, 2, 5, 9, Repair kit for 3.5” locking mecha-
20, 23, SK 2421-76 SK 2421-76Z
nism
24, 27
1, 2, 5, 9, Repair kit for 2” locking mecha-
20, 23, SK 2421-77 SK 2421-77Z
nism
24, 27
57, 58, Repair kit for bearing SK 2421-78 SK 2421-78
60

Item Conversion/retrofit kits Article no. for type C Article no. for type CZ
1, 2, 20, Conversion kit for swapping 3.5” SK 2421-98 SK 2421-98Z
23 locking mechanism for 2” version
1, 2, 20, Conversion kit for swapping 2” SK 2421-99 SK 2421-99Z
23 locking mechanism for 3.5” version
35, 54, Retrofit kit for handle extension, SK 3121-063 SK 3121-063
55 complete

JSK 38/50 ZDE 199 003 012 DE • 07-2020 29

 Member of JOST World
JOST, Germany, Tel. +49 6102 295-0, tkd-technik@jost-world.com, www.jost-world.com
ZDE 199 003 012 DE • 07-2020 • 1.0