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Technical
Information
One this page you will find technical information
for axle & brake assemblies, wiring diagrams and type loading etc... Simply
scroll down or use the shortcuts provided below.
shortcuts
•
Axle & Brake assemblies
• Brake Cables
• Wiring Diagrams
• Wheels & Tyres
Rubber Suspension
Axle/Brakes
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Key:-
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1 |
Black Plate LH |
18 |
Reversing Shoe Assembly |
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2 |
Blanking Plug |
19 |
Blanking Plug |
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3 |
Adjusting Wedge Nut |
20 |
Hub |
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4 |
Side Wedge |
21 |
Wheel stud |
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5 |
Adjusting Bolt |
22 |
Wheel nut |
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7 |
Expander Assembly |
24 |
Oil seal |
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8 |
Shoe Carrier |
25 |
Inner Bearing |
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9 |
Reversing Shoe |
26 |
Outer Bearing |
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10 |
Standard Shoe |
27 |
Split Pin |
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11 |
Retaining Spring |
28 |
Washer |
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12 |
Reversing Shoe Spring |
29 |
Axle Nut |
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13 |
Top Spring |
30 |
Hub Cap |
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14 |
Bottom Spring |
31 |
Locking Nuts with Domed Washers |
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15 |
Cable Bracket Top Half |
32 |
Balance Bar |
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16 |
Eyelet |
33 |
Brake Cable |
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17 |
Back Plate RH |
34 |
Cable Abutment Nuts |
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Brake Cables
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Terminal Number |
Function |
13 Core wire colour |
13 Core wire colour |
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1 |
Indicator LEFT |
Yellow |
Yellow |
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2 |
Rear fog light |
Blue |
Blue |
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3 |
Earth for contacts 1
to 8 |
White |
White |
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4 |
Indicator RIGHT |
Green |
Green |
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5 |
Side lights, marker
lights & number plate light RIGHT |
Brown |
Brown |
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6 |
Brake lights |
Red |
Red |
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7 |
Side lights, marker
lights & number plate light LEFT |
Black |
Black |
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8 |
Reversing lights |
Pink |
Pink |
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9 |
Positive
direct from battery |
Orange |
Purple |
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10 |
Positive
ignition key on |
Grey |
Grey |
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11 |
Earth return for
contact 10 |
White/Black |
Clear |
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12 |
Signaling connection
to trailer |
White/Blue |
Buff |
|
13 |
Earth return for
contact 9 |
White/Red |
Black/Red |
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There
are some variations between 13 core cable colours, the above appear
to be the most popular. |
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12N
(Normal) Lighting |
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Terminal Number |
Function |
7 core wire colour |
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1 |
Indicator Left |
Yellow |
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2 |
Rear fog
light |
Blue |
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3 |
Earth |
White |
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4 |
Indicator Right |
Green |
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5 |
Side
lights, marker lights & number plate light Right |
Brown |
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6 |
Brake
lights |
Red |
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7 |
Side
lights, marker lights & number plate light
Left |
Black |
Wheels & Tyres
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How to calculate the Pitch Circle Diameter P.C.D
Measure the distance between the centres of two
adjacent holes ‘S’ and then complete the following equation.
Due to the accuracy of measuring it may be
necessary to round to the nearest available PDC measurement. |
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4 Stud |
|
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4 Stud PCD = |
S
0.7071 |
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EXAMPLE
if S= 71mm
PCD = 71÷
0.7071 = 100.41 = 100mm
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5 Stud |
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5 Stud PCD = |
S
0.5878 |
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EXAMPLE
if S= 97mm
PCD
= 97 ÷ 0.5878 = 165.02 = 165.1mm
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‘S’
can be measured in metric or imperial. Imperial measurement must be
a decimal. It may be easier to measure ‘S’ in millimetres and try a
conversion to imperial to see if you have a metric or imperial PCD.
Iimperial
to Metric common PCD measurements:
4” = 101.6mm
5.5” = 139.7mm
6” = 152.4mm
Please contact us if you need any help.
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Trailer
Tyres & Tubes
Trailer and Caravan Tyre Markings & Condition:
Car, caravan and trailer tyres must have at least 1.6mm of tread over the
central 75% of their width for their entire circumference, although a tyre with
under 3mm offers little grip in the wet. Tyres must be free from deep cuts and
bulges (which indicate they are breaking up) and it is illegal to use cross-ply
and radial tyres on the same axle. (Make sure that the tyres you fit to your
trailer are of the correct rating.)
Additional Tyre information:
See links above for detailed tables on Tyre Load Index, Tyre Speed Symbols and
Tyre Load & Pressure Ratings.
Tyre sidewall markings:
The illustration below provides an explanation of the markings currently found
on a tyre sidewall.
* do not apply in the U.K.
Retreads - must also show either
'RETREAD' or 'REMOULD' on the sidewall, together with 'BSAU 144' in place of ECE
Type Approval Mark.
Aspect ratio - ratio between the
height of the sidewall and the width of the tread, expressed as a percentage. In
the example above, the figure is 70%.
Nominal section width - on radial
tyres this is expressed in millimetres, on cross ply tyres, inches are used.
Tyre Load
& Pressure Ratings
|
Tyre size |
Max speed |
|
100 km/h |
60 mph |
130 km/h |
81 mph |
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Axle Load kg |
PSI/Bar |
Axle Load kg |
PSI/Bar |
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400 x 8 (4ply) |
540 |
60/4.2 |
- |
- |
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400 x 8 (6 ply) |
680 |
75/6.2 |
- |
- |
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500 x 10 (6 ply) |
860 |
50/3.5 |
- |
- |
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5.20 x 10 |
616 |
32/2.2 |
- |
- |
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145 x10 |
693 |
35/2,4 |
630 |
32/2.2 |
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145 x 10 (R/F) |
781 |
42/2.9 |
710 |
39/2.7 |
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140/70 x 12 |
1060 |
62/4.3 |
- |
- |
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155/70 x 12 |
1800 |
90/6.2 |
1636 |
87/6.0 |
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145 x 13 |
825 |
53/3.7 |
750 |
32/2.2 |
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155 x 13 |
935 |
35/2.4 |
850 |
32/2.2 |
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155 x 13 (R/F) |
1045 |
42/2.9 |
950 |
39/2.7 |
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165 x 13 |
10445 |
36/2.5 |
950 |
33/2.3 |
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165 x 13 (R/F) |
1166 |
45/3.1 |
1060 |
42/2.9 |
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175 x 13 |
1166 |
36/2.5 |
1060 |
33/2.3 |
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175 x 13 (R/F) |
1276 |
45/3.1 |
1160 |
42/2.9 |
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175 x 13 (6ply) |
1407 |
54/3.75 |
1340 |
54/3.75 |
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183 x 13 (6ply) |
1500 |
54/3.75 |
1460 |
54/3.75 |
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185/70 x 13 (Avon 950) |
1900 |
87/6.0 |
1800 |
87/6.0 |
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175 x 14 (6ply) |
1491 |
54/3.75 |
1420 |
54/3.75 |
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175 x 14 (8ply) |
1628 |
65/4.5 |
1550 |
65/4.5 |
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185 x 14 (6ply) |
1628 |
54/3.75 |
1550 |
54/3.75 |
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185 x 14 (8ply) |
1785 |
65/4.5 |
1700 |
65/4.5 |
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195 x 14 (6ply) |
1785 |
54/3.75 |
1700 |
54/3.75 |
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195 x 14 (8ply) |
1995 |
65/4.5 |
900 |
65/4.5 |
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600 x 16 (6ply) |
1533 |
52/3.6 |
- |
- |
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650 x 16 (6ply) |
1890 |
62/4.3 |
- |
- |
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750 x 16 (6ply) |
2100 |
51/3.5 |
- |
- |
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