Valx WSM DRUM Instruction manual

Document code: WSM_2051-04 Date: October 2020
WSM DRUM
WORKSHOP MANUAL DRUM BRAKES

WSM_2051-04 3
For additional information on assembly, disassembly, adjustments, maintenance and repair,
contact VALX B.V.:
De Amert 700C
5462 GH Veghel
The Netherlands
Tel: [phone] (general)
Fax: [phone]
E-mail: [email protected] (general)
E-mail: [email protected] (technical support)
www.valx.eu
Document code: WSM_2051-04
Copyright © 2020
Revision summary
Date Revision number Comment
June 2010 01 Initial version
August 2011 02 -
December 2011 03 Address update
October 2020 04 General update
This document and all information herein is and remains at all times the exclusive property of VALX B.V. and shall not - in
whole nor in part - without the prior wrien permission of VALX B.V. be disclosed to any other person, published in any form
of publicity or news story, copied, photographed, reproduced or stored in any retrieval system of any nature.
The information in this document has been prepared solely for the purpose of providing information about assembly,
disassembly, repair and maintenance on the trailer axle and the suspension system (hereafter: trailer axle). It has been
compiled in good faith by VALX B.V. and is provided without any express or implied warranty as to its completeness or
accuracy. We reserve the right to make amendments to this document to reect further developments.
The original English text in this document will be legally binding and shall prevail in case of any variance between the English
text and a translation. As any translation may be imprecise and inaccurate in whole or in part, VALX B.V. does not accept any
risk, liability and responsibility for any translation.
Any quotations, oers and agreements relating to goods to be delivered and/or services to be provided by VALX B.V. shall
always be subjected to VALX B.V.’s Terms of Sale and Delivery. All other terms and conditions are expressly rejected.
© 2020 VALX B.V. All rights reserved.

4 WSM_2051-04
Preface
Use of this manual
This Workshop Manual is intended for trained and qualied service technicians to enable them to perform all required
maintenance and repair tasks on VALX products in an ecient, safe and environmentally sound way.
TAKE THE TIME TO READ THIS MANUAL THOROUGHLY BEFORE PERFORMING ANY MAINTENANCE OR
REPAIR TASK.
KEEP THIS MANUAL IN A SAFE PLACE, IN THE WORKSHOP.
THIS MANUAL REPLACES ALL PREVIOUS VERSIONS, IF ANY.

WSM_2051-04 5
Conventions
In this manual:
- The steps required to perform a certain task are always numbered. The procedures must imperatively be carried out
in the order given.
- Enumerations (without a prescribed order) are always preceded by a dash (-).
- The words ‘left’ and ‘right’ are used to indicate a certain part or assembly as viewed from the perspective of the
service technician who is doing the job.
- “VALX” is used as a substitute for “VALX B.V.”
NOTE
The VALX drum brake trailer axle has been designed for 0-oset wheels.
0-offset
0
Document code
The document code of this manual can be found in the footer of each page. The document code consists of two elds:
- Document type (WSM = Workshop Manual, TBM = Trailer Builder Manual, DM = Driver Manual)
- Document number
The third eld contains the document revision number.
Related documents
The following related documents are available:
- Trailer Builder Manual (TBM_20XX)
- Driver Manual (DM_20XX)
- Air suspension systems (WSM_20XX)
Conversion SI-units – imperial units
SI-units -> non-metric units non-metric units -> SI-units
1 kg ≈ 2.2046 lb 1 lb ≈ 0.453592 kg
1 mm = 0.03937 in 1 in = 25.4 mm
1 m = 3.28 ft 1 ft = 0.3048 m
1 km = 0.62 mile 1 mile = 1.609 km
1 Nm ≈ 0.7376 ft-lb 1 ft-lb ≈ 1.3558 Nm
1 MPa (10 Bar) = 145 psi 1 psi = 0.0068966 MPa (0.0689 bar)
Service and technical support
For information about specic maintenance or repair tasks, adjustments or test procedures that are beyond the scope of
this document, please contact VALX at [email protected].
Make sure that you have the axle type code at hand. See chapter 2.

6 WSM_2051-04
Table of contents
Pictograms in this manual 7
Symbols 8
Symbols for quick reference 11
1 General safety instructions and regulations 13
1.1 General 13
1.2 This manual 13
1.3 Decals and instructions on the product 13
1.4 Warranty and original VALX parts 13
1.5 Maintenance and repair 13
1.6 A contribution to the protection of our environment 14
1.7 Safety instructions when working on the brake system 14
1.8 Safety instructions when working on the wheel hub unit 14
1.9 Safety instructions when working on the axle beam 14
2 Explanation of the axle type code 15
2.1 Locationoftheidenticationplate 15
2.2 Informationontheidenticationplate 15
2.3 Ordering of parts 16
3 Maintenance chart 17
4 Tightening torques 18
5 Axle complete 19
5.1 Overview 19
6 Preparatory actions 20
6.1 Place the wheel chocks 20
6.2 Jack up the trailer 21
6.3 Remove the wheel(s) 22
6.4 Install the wheel(s) 23
7 Brake system 25
7.1 Safety instructions 25
7.2 Overview 25
7.3 Periodic maintenance and inspection 26
7.4 Disassembly, assembly and adjustments 32
8 Wheel hub unit 51
8.1 Safety instructions 51
8.2 Overview 51
8.3 Periodic maintenance and inspection 52
8.4 Disassembly, assembly and adjustments 53
9 Axle beam 63
9.1 Safety instructions 63
9.2 Overview 63

WSM_2051-04 7
Pictograms in this manual
Pictograms for general alerts
In this manual the following pictograms and symbols may be used for general alerts:
NOTE
Important instruction, recommendation or tip that you must always observe.
If the safety instruction is not observed, a potential hazardous situation can occur, causing personal
injury or damage to the product, the workshop or the environment.
If the safety instruction is not observed, an imminent hazardous situation will occur, causing severe
personal injury or death.
Pictogramsforspecicalerts
In this manual the following pictograms and symbols are used for specic alerts:
CAUTION
Risk of injury due to hazardous dusts.
CAUTION
Risk of injury due to heavy weight.
CAUTION
Risk of injury: crushing of ngers.
>25 kg
CAUTION
Weight exceeds 25 kg.

8 WSM_2051-04
Symbols
Sometimes, a picture or a pictogram tells more than text can. For that reason, the maintenance, assembly and
disassembly procedures in the chapters 5 through 9 mainly consist of graphical instructions.
In these graphical instructions the following pictograms may be used:
Tools
32
Use a spanner
The value in the left-hand corner is the width across ats.
8
Use a ring spanner
The value in the left-hand corner is the width across ats.
290 Nm
Use an appropriate torque wrench
Tighten the fastener to the torque (in Nm) given in the left-hand corner.
1 mm
Use a feeler gauge
The value in the left-hand corner is the thickness of the feeler gauge.
14
Use a hex key
The value in the left-hand corner is the hex key size.
Use a pair of circlip pliers
Use a hammer
Use an appropriate wire brush
Use a chisel
Use a crowbar
Use an inside calliper

WSM_2051-04 9
Special tools
Use the central nut locking tool
75
Usethesocketwrench(widthacrossats75)
The value in the left-hand corner is the width across ats.
Usethespecialsockettool(widthacrossats103)
The value in the left-hand corner is the width across ats.
Lubricants
Optimol
White Paste
Lubricate with Optimol White Paste
Mobilith SHC 220
Lubricate with Mobilith SHC 220
Renolit HLT1
Lubricate with Renolit HLT1
WABCO ABS
sensor grease
Lubricate with ABS sensor grease
Clean with an appropriate degreasing agent

10 WSM_2051-04
Miscellaneous
Release the brake
Release the brake prior to this step.
Actuate the brake
Actuate the brake prior to this step.
Visual check
Check for damage, wear, corrosion, correct fastening.
Thissteprequirestwotrainedandqualiedservicetechnicians
Clean with a lint free cloth
Measure