Maintenance
153
towing shaft. Note! Over adjustment to
the long ball nut (Fig. 12/Item 2) could
induce movement of the inner brake
cable, reducing the effective clearance of
the brake shoes. If the overrun lever will
not make contact, it is possible the two
lock nuts, forward of the spring cylinder,
are incorrectly adjusted. Loosen the nuts
and adjust brake rod as above (Figs. 10
& 12).
13. Adjust the two locking nuts, forward of
the spring cylinder (Fig. 10), (on some
chassis a single Nyloc nut is used) to
give 1 mm of clearance on the spring
cylinder. This cylinder (the energy store
for the handbrake operation) must be
able to rotate ONLY, not slide on the
brake rod. (Fig. 12). (If the overrun
assembly is fitted with a gas strut
handbrake then no spring cylinder is
fitted - therefore ignore this paragraph).
14. CORRECT ADJUSTMENT of the linkage
is checked by operating the handbrake
lever so that when the second or third
tooth is engaged, a slight braking force is
felt on the road wheels.
15. OVER ADJUSTMENT of either the wheel
brakes or linkages, will result in difficult
reversing causing the wheels to “lock-
up”.
16. When parking, the handbrake lever
MUST ALWAYS be engaged into the fully
upright position (90°). This is to
compress the spring within the spring
cylinder and thereby create an energy
store which will automatically engage the
brakes further should the caravan move.
If difficulty is experienced in this
operation, try easing the caravan
backwards with one hand while engaging
the handbrake fully with the other. This
manoeuvre should not be attempted on
a rearwards facing slope. In this case
wheel chocks should be used combined
with the handbrake. See page 164 for all
handbrake operations.
17. Finally, if the road wheels have been
removed, re-tighten using a calibrated
Torque Wrench to 88 Nm (65 lbs/ft) - on
all M12 wheel bolts -in sequence, i.e.
North, South, East, West
NOT clock or
anti-clockwise (refers to steel rims only).
Remember to over-tighten is just as
dangerous as to under-tighten, as this
can distort the wheel rims. Avoid the use
of power wrenches.
IMPORTANT - The torque settings
should be rechecked after 50 Km. Wheel
bolts should NEVER be lubricated.
Coupling Heads/Combined Stabiliser
Devices
Your Caravan will be fitted with either a
standard coupling head or a combined
stabiliser/coupling unit. If your caravan is
fitted with an AKS 1300 Stabiliser, please
request Part No. 1385106 for full operating
instructions. If fitted with AKS 2700,
request Part No. 1385107.
Safety Precautions
Always ensure that the coupling head is
properly connected to the tow vehicle’s
towball every time you couple up. If this
procedure is not carried out correctly, the
caravan/ trailer may become detached from
the towing vehicle!
Maximum possible articulation of the
coupling head must not exceed ±25 o
vertically and ±20 o horizontally - see Fig 13.
If exceeded, components will be overloaded
and the operation of the assembly adversely
affected!
Fig. 13
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