Remove the lock, take off the cover, and very carefully remove
the levers keeping them very strictly in order. Wipe each lever
clean then coat lightly either with specific graphite grease for
locks or with Waxoyl. Reassemble spreading a little more
grease/Waxoyl on the bolt and its slide (may need to be done
whilst the levers are out of the way.) Should fix the problem
I suppose you will now tell us that this is a 'continental' style
lock that uses a Yale-type rather than a Chubb-type key? If so
then remove the barrel (usually by removing one screw in the edge
of the door and sliding out,) hold it vertical and squirt it with
a Teflon based lubricant. Exercise the cylinder whilst it is
still wet, then when all of the excess lubricant has run out
replace the barrel in the door.
I have no doubt that I will now be seriously flamed, but I have
used these techniques for years and have never had a lock cause
any problem as a result.
You haven't said whether this still applies when the door is open? If so
then definitely open the lock up and take a look for binding or lack of
lube (rare IME). As it's a lever lock mentioned below, these are
exceptionally easy to remove and dismantle with usually a single screw
holding on the backplate. If not then look for something constricting
the bolt action, your door may have moved/warped with the recent change
to better weather.
I've never heard of waxoyl being used, novel. I've never used a specific
grease on lever type locks, in facts IME it's rare to need to add more,
if the moving surfaces are in need of lube then there's usually enough
displaced around the case to re-use. For a from scratch rebuild I use a
molybdenum based grease but that's just because I have it around, it is
the right consistency and it doesn't go off in air.
Agreed on teflon lube for cylinders, I wouldn't use WD40 unless to wash
some other gummed up lube out of the pins. Blown graphite often sold for
the purpose is bad too as it can set like concrete is washed through it.
Maybe practice the dismantling on that one if you're concerned with
FIVE TV's superbright logo - not the DOG's, it's bollocks
It could still be heat, my back door has 4 metal bolts that throw across
into the metal frame when you pull the handle up to lock it, and it always
gets stiff at this time of the year when the bolts and the frame expand.
It's not in direct sunlight, but the ambient temperature is high enough to
expand the parts. It's quite a precise adjustment, so even a small rise in
the temp can throw it out enough to be stiff. It fits like a charm in
Winter, I assume it was fitted and adjusted on a cold day!
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