Optional Attachments
Connecting/Disconnecting Hydraulic Hoses
167 167
9811/5700-7
Quick Release Couplings
!MWARNING
The external surfaces of the couplings must be clean
before connecting or disconnecting. Ingress of dirt
will cause fluid leaks and difficulty in connecting or
disconnecting. You could be killed or seriously injured
by faulty Quick Release Couplings.
2-4-1-15
Flat face quick release couplings allow the operator to
remove and install attachments swiftly and efficiently.
Generally, your machine pipework will be fitted with a
female coupling A and a male coupling B. The optional
attachment hoses will also be fitted with a female coupling
A and a male coupling B. K
Fig 133. ( T 168).
The quick release couplings should be trouble free and
relatively easy to connect and disconnect, provided they
are kept clean and used correctly. The recommendations
listed below should always apply when using flat face
quick release couplings.
Finally, please read the correct fitting and releasing
procedures before you install or remove any optional
attachment fitted with quick release couplings.
Essential Do's
– Before connecting or removing any hydraulic hose,
residual hydraulic pressure trapped in the service
hose line must be vented. Make sure the hose service
line has been vented before connecting or removing
hoses.
– Always wipe the two mating faces clean before
connecting.
– Use caps and plugs when the couplings are
disconnected.
– Always align the external locking ball (if used) with the
notch in the locking sleeve and then pull the locking
sleeve back fully to disconnect.
– If a coupling sticks, first check that pressure has been
released. Ensure the locking ball and notch in the
locking sleeve are aligned, pull back the sleeve and
twist the couplings apart. Sticking is normally caused
by dirt in the coupling or physical damage due to
abuse.
– Connect and disconnect new couplings two or three
times to work the PTFE seals. Sometimes a new
coupling will stick if the seal has not been worked.
– When fitting couplings, only apply the spanner or
grips to the hexagon and nowhere else.
– Avoid damage to the coupling faces. Burrs and
scratches cause damage to the seals and cause
leaks. They can also impede connection and
disconnection of the couplings.
– Periodically lubricate the internal locking balls on the
female half of the coupling with silicone grease.
Essential Don'ts
– Never attempt to reconnect using a damaged half
coupling as this will destroy the seals in the mating
half and necessitate replacement of both halves.
– Do not leave the coupling where it may be run over by
a vehicle or otherwise crushed - this will distort the
sleeve and prevent connection and disconnection.
– Never try to turn the sleeve when the coupling is
disconnected since this will cause the locking ball to
jam under the locking sleeve and damage the
coupling.
– Never try to strip the coupling down, there are no user
serviceable parts. If the coupling is damaged it should
be replaced with a new one. See coupling guides for
a reference.
– Never hit the centre poppet of the coupling to try and
release locked in pressure. This can cause
irreparable damage to the coupling and serious injury.
– When fitting couplings, never clamp on the sleeve of
the female or nose of the male - this will cause
distortion and/or damage.
– Never subject the couplings to external forces,
especially side load. This can reduce the life of the
coupling or cause failure.
– Never allow the torsional forces transmitted from
hoses to unscrew/screw together couplings.
– Never use a coupling as a plug.
– Do not connect and disconnect with pressure in the
line unless the coupling type is specifically designed
to do so.
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