Fifth wheel coupling - check function, play and attachment

AP31.10-B-3150TA

Fifth wheel coupling - check function, play and attachment

14.06.2017

Model

934.241/251, 936.315, 938.14

Model

958.077

Model

958.1

Model

958.2

Model

958.4

Fifth wheel closed (schematic example)

1

Unlocking lever

2

Locking bar

3

Locking claw

4

Kingpin

Fifth wheel open (schematic example)

1

Unlocking lever

2

Locking bar

3

Locking claw

4

Kingpin

Fifth wheel Jost

A

Lubrication groove

B

High wear area

C

Ruler



Check

1

Check locking claw (3), friction disk and kingpin (4) for wear


Do not use solder to fill the wear of the components.
The welding alters the characteristics of the material and the structure can be damaged..

 Check the maximum wear limits according to the fifth wheel manufacturer's manual.

 Replace the components to achieve maximum wear limit.

 The wear above the upper limits should not be compensated by the manual adjustment of the locking system.

2

Check the wear of the upper base of the fifth wheel block

 The hatched wear area (B) comprises up to 50 mm from the edge.

 To measure wear, use a ruler (C) as a level.

Type 934.241/251, 936.315, 938.14. 958.077/1/2/4Upper base edge wear limit

*BE31.10-B-1004-01B

If wear is present up to the level of the lubrication groove (A) at any point



The entire fifth wheel must be replaced.

3

Check the gap in mounting table bearings

 Execution is different respectively according to the manufacturer of the fifth wheel. Refer to the manufacturer's instructions.

In the case of damages/failures found



Eliminate with separated invoicing.

4

Check bearing brackets fixing bolts on the mounting table, as well as the table in the frame, for their firm fixing

 If necessary retighten to prescribed torque.

 Model 934.241/251, 936.315, 938.14, 958.077/2/4Fixture of fifth wheel to the counter

*BA31.10-B-1002-03A

 Model 934.241/251, 936.315, 938.14, 958.077/2/4Attachment of the 5th wheel table to the chassis

*BA31.10-B-1001-03A

5

Check the wear and conditions of the kingpin table (4)

 Ensure that the reinforcements are suitable for the application.
The surface of the kingpin table (4) should be flat and smooth, with no welding protrusions.
Front and side with no sharp corners.
Full resting on the surface of the fifth wheel.

Type 934.241/251, 936.315, 938.14, 958.077/1/2/4Maximum wear and/or warping

*BE31.10-B-1005-01B

If wear and/or warping is above the maximum limit



The table should be replaced to avoid premature wear of the fifth wheel surface.

6

Perform manual adjustment of the locking system

Type 934.241/251, 936.315, 938.14, 958.077/1/2/4

AP31.10-B-3150-01TA

 Adjustment of the locking mechanism gap must be made periodically according to maintenance schedule of the manufacturer, or whenever the pulled implement is replaced.

Trailer device, coupling with the trailer car, fifth wheel

Number

Designation

Type 934.241/251, 936.315, 958.0/1/2/4

BE31.10-B-1004-01B

Upper base edge wear limit

mm

8

Trailer device, coupling with the trailer car, fifth wheel

Number

Designation

Type 934.241/251, 936.315, 958.0/1/2/4

BE31.10-B-1005-01B

Maximum wear and/or warping

mm

2

 5th wheel

Number

Designation

Model 934.241/251, 936.315, 938.14, 958.077/2/4

BA31.10-B-1001-03A

Attachment of the 5th wheel table to the chassis

M20

Nm

530

 5th wheel

Number

Designation

Model 934.241/251, 936.315, 938.14, 958.077/2/4

BA31.10-B-1002-03A

Fixture of fifth wheel to the counter

M16

Nm

275...300