Frequently Asked Questions
Yes, the G Coupler (LockNLube® in North America) has a replaceable seal kit.
Oui, le G Coupler (LockNLube® en Amérique du Nord) dispose d'un kit de joint remplaçable.
The G Gun has the following spares available:
GC81003Pump Unit (PRV)
GC810072m Hose Assembly
GC810083m Hose Assembly
GC810094m Hose Assembly
GC810105m Hose Assembly
Q: Can I use the G Coupler Grease Coupler to lubricate in very tight places or in recessed fittings?
As a high pressure, heavy duty grease coupler, it will fit into the majority of recesses (the diameter on the front is 0.63in (16mm), only 0.04in (1mm) greater than most standard push-on couplers).
The diameter of the G Coupler coupler is smaller than a number of the most common heavy duty grease couplers.
While the G Coupler coupler is compatible with most recesses and nipple placements, it may not fit into very tight or some recessed spaces.
Accessibility to the odd hard-to-reach zerk, can often be resolved by fitting a different variation of Zerk grease fitting. One with a longer neck, shorter neck, 45 degree bend, right angle (90 degree) bend, etc. These fittings are usually low cost items that are very easy to replace.
We have had a couple of questions about this, but in the end our customers still believe that this small shortcoming is greatly outweighed by the many benefits.
Q: Can I use the G.Gun in very dusty environments? I'm always struggling with contaminated grease being wasted.
The unit has a clip-on lid that prevents dust contaminating the grease. The complete pump unit is incorporated inside the grease canister so there are no external seals.
Most other grease guns have the piston protruding outside the grease reservoir, which is then in turn attached to some lever mechanism via some form of linkage.
Where the piston comes out, dust will be attracted to the residual grease on the piston rod and after use, eventually damaging the seal, causing bypass. This can end up being very messy. Also where the external linkages get dirt and dust in them, they will wear a lot quicker.
All the G.Gun moving parts are incorporated within the grease canister and therefore submerged in and always lubricated by the grease.
Yes, you can download a PDF file by clicking on this link.
It is extremely seldom that you will experience an air-lock on a G.Gun. Most pumps are single stage with a relatively small swept volume. This is the prime cause for air locks, where any air drawn in through the top of the grease down a 'vortex' can then create an airlock.
The G.Gun's internal mechanism creates a wave action preventing a vortex and the two stage pump copes with any air that may be trapped in the grease.
Watch this instruction video that describes all the steps necessary to replace the seal kit on the G Coupler (LockNLube™ in North America).
The G.Gun is more portable and user friendly than the pail type guns.
The larger capacity canister requires less frequent filling than the hand held and battery powered grease guns (like the Powerluber™). You spend less time refilling your grease gun and more time greasing those joints.
It is a lot more ergonomic to use your foot to pump rather than bending down and pumping a pail on the ground. This allows for faster greasing.
The hand held type with the pistol grip, are very fatiguing to pump. The G.Gun has a lot more leverage on the treadle, requiring less effort to pump.
Pneumatic (air powered) and electric/battery powered systems that are used in more organised workshop environments, rather than on site, will always be faster than any manual system. But then, when one is in the field, you won't have to worry about flat batteries, car chargers, replacing expensive batteries or having compressed air handy.
Our units are sold standard with a 6.5ft (2m) hose. Longer hose lengths can be purchased as a spare item, generally these go up to 16ft (5m). We have also supplied lengths up to 33ft (10m).
The G.Gun grease gun dispenses a theoretical 3cc per stroke. Our tests confirm the actual volume dispensed is 2.7cc/stroke. The difference has to do with the time the valves take to close.
Should a specific volume be required, a person can count the number of strokes they pump.
When it comes to greasing precision bearings, it is possible that they can be over greased and cause more damage than good. In these cases, some form of accurate metering should be used. There are companies that sell metering units that be fitted in-line on the hose.
Yes, you can use the G Coupler with (NGLI) 000.00 grease. Disconnection may be slightly messy though.
No. With the G.Gun you are always refilling into the same canister, so although you will never pump out all the grease, the small amount of “dead” grease is essentially only lost on the first filling thereafter it’s a closed self-lubricating system.
Our experience is that, by it's very nature, a follower plate is the major cause of contaminants being introduced into the grease.
The biggest disadvantage with a follower-plate design, is that when a pump is being changed from one pail to another, the likelihood of contaminants attaching to the grease on the follower plate is very high.
This is now a 12 inch (300 mm) diameter disc covered in grease which is a super stick magnet for anything - especially airborne dust.
On the poorer quality units, the grease can also find its way to the top of the follower plate. So when refilling is required, there is a good chance that grease will fall on the floor.
Here's a list of compatible grease guns that the G Coupler fits onto:
- Plews lubrication (Edelmann)
- John Deere
... almost any grease gun should work
The G Coupler grease coupler can be used on manual lever action, pistol grip, trigger action, battery powered (cordless) and pneumatic (air operated and powered) greasing equipment.
Our internal testing has had the Lock and Lube™ coupler seal on the Zerk nipple at 690 bar (10,000 psi) consistently (see demonstration of grease coupler sealing under high pressure).
This means you can use the Lock and Lube™ Coupler on heavy-duty industrial pumps and pneumatic grease pumps with pressure ratings up to 690 bar (10,000 psi).
Ensure that all your fittings and pipes are well maintained and correctly specified for the pressure you will be using. A hose that bursts under high pressure can cause grease to penetrate your skin. This is a serious health risk.
When combined with the G.Gun, you can easily build enough pressure to jack the tracks on your industrial crawler equipment - in the field.
The diameter of the tip of the coupler is 16 mm (0.63 inches).
The length of the slide body is 15 mm (0.59 inches).
The length of the coupler body is 78 mm (3.07 inches).
The length of the coupler from tip to release handle is 88 mm (3.46 inches).