Flexible pipes and hoses

GENERAL INFORMATION

03-14

Self-locking nuts

Self-locking nuts, i.e. nylon insert or deferred thread 
nuts can be re-used  providing resistance can be felt 
when the locking portion of the nut passes  over the 
thread of the bolt or stud.

DO NOT apply heat in an attempt to free deferred 
thread nuts or fittings;  as well as causing damage to 
protective coatings, there is a risk of damage to 
electronic equipment and brake linings from stray 
heat.

Where self-locking nuts have been removed, it is 
advisable to replace them with new ones of the same 
type.

Where bearing pre-load is involved, nuts should be 
tightened in accordance with special instructions.

Flexible pipes and hoses

General
When removing and installing flexible hydraulic pipes 
and hoses, ensure that the following practices are 
observed to ensure component serviceability:

l

Before removing any brake or power steering 
hose, clean end fittings and area surrounding 
them as thoroughly as possible.

l

Obtain appropriate plugs or caps before 
detaching hose end fittings,  so that the ports 
can be immediately covered to prevent the 
ingress of dirt.

l

Clean hose externally and blow through with 
airline. Examine carefully for cracks, separation 
of plies, security of end fittings and external 
damage. Reject any faulty hoses.

l

When refitting a hose, ensure that no 
unnecessary bends are introduced, and that 
hose is not twisted before or during tightening of  
union nuts.

l

Fit a cap to seal a hydraulic union and a plug to 
its socket after removal to prevent ingress of 
dirt.

l

Absolute cleanliness must be observed with 
hydraulic components at all times.

l

After any work on hydraulic systems, carefully 
inspect for leaks underneath the vehicle while a 
second operator applies maximum brake 
pressure to the brakes (engine running) and 
operates the steering.

Do not disconnect any pipes in an air 
conditioning refrigeration system unless trained 
and instructed to do so. A refrigerant is used 
which can cause blindness if allowed to contact 
eyes.