Push Type Grease Gun Manufacturer & Exporter - Push Type Grease Guns

Frequently Asked Questions: Push Type Grease Guns

What is a push type grease gun?

A push type grease gun is a compact manual lubrication tool that uses palm pressure on a T-handle or back plunger to push grease through a 36 mm barrel into small grease fittings at 1,000 PSI (69 bar). Unlike lever action grease guns (two-hand pumping lever, up to 12,000 PSI) or pistol grip grease guns (one-hand trigger, 3,000-10,000 PSI), a push type gun has no trigger or lever: the operator simply pushes down with palm pressure and the spring-loaded plunger delivers one stroke of grease, typically 0.9 grams or 0.3 grams on precision mini models.

How does a push type grease gun work?

Push down on the T-handle (or back plunger), which compresses the grease column in the 36 mm barrel and forces grease through the non-return valve and out the connector or nozzle into the grease fitting. Release the pressure and the extra-heavy follower spring resets the plunger for the next stroke. Each stroke delivers approximately 0.9 g on the S-720, S-721, S-720P and S-721P (1 oz. per 32 strokes) or 0.3 g on the S-722 and S-722CL precision minis (1 oz. per 95 strokes). The smaller output per stroke on the mini models is deliberate for precision applications where over-greasing would damage small bearing seals.

What is a push type grease gun used for?

Push type grease guns are designed for small, precise, and occasional lubrication tasks where a full-size lever or pistol grease gun is too bulky or delivers too much pressure. Common applications: hammer-mechanism greasing on impact wrenches, air ratchets and cordless power tools; chainsaw guide-bar tip and sprocket lubrication; lawn mower spindle bearings and deck pivots; ATV, motorcycle and snowmobile pivot fittings; trailer hitch couplers and boat trailer wheel bearings; bicycle bottom brackets, hub bearings and pedal threads; garage door hinges and gate hinges; flush-type fittings on industrial machinery; and small precision fittings on 3D printers, treadmills, sewing machines, printing presses, conveyor bearings and dental or medical equipment.

What is the difference between a push type and lever action grease gun?

Push type uses palm pressure at 1,000 PSI for small, precise applications in tight spaces. Lever action uses a two-hand pumping lever at 6,000 to 12,000 PSI for higher pressure and volume on larger bearings and industrial service. Push type guns typically hold 30 to 150 cc of bulk grease; lever guns hold 15 to 20 oz. (500-650 cc) plus a 400 g cartridge. Push type delivers 0.3-0.9 g per stroke; lever type delivers 1-2 g per stroke. Choose push type for small-fitting spot jobs in confined spaces; choose lever action for routine bearing service on industrial, agricultural and heavy-equipment machinery where higher pressure clears stiff or crusted fittings.

What is the difference between push type and pistol grip grease guns?

Push type uses palm pressure for simple, compact operation at 1,000 PSI. Pistol grip uses a trigger mechanism for one-hand operation at 3,000 to 10,000 PSI and typically accepts 3 oz. or 14 oz. cartridges. Both are one-hand tools, but the pistol grip trigger delivers higher pressure and volume per stroke, making it the right pick for regular automotive chassis service, ball joints, U-joints and sealed bearings. Push type is simpler, smaller and more compact; pistol grip offers more power and larger capacity. Many professional workshops stock both: pistol grip for routine service, push type for small-fitting spot lubrication.

Which push type grease gun should I buy - steel, plastic, or clear tube?

Pick steel body (S-720 30 cc, S-721 125 cc) for the most durable, heat-resistant and chemical-resistant construction in a professional workshop. Pick plastic body (S-720P 65 cc, S-721P 150 cc) for lighter weight, corrosion resistance and non-conductive operation in wet, marine or electrical-adjacent environments. Pick clear tube (S-722CL) when seeing the grease level and cartridge condition at a glance matters for your workflow. The plastic models also have a pointed connector (versus the universal connector on the steel models), which is preferred for direct application on flush-type fittings. The S-722 and S-722CL precision minis are the correct pick for hammer-mechanism greasing and tiny industrial fittings because they ship with three interchangeable needle nozzle sizes (0.7 / 1.0 / 1.4 mm).

How do you fill a push type grease gun with bulk grease?

Unscrew the barrel cap, push the plunger rod to the bottom, use a clean spatula or flat-blade tool to pack fresh grease into the barrel from the top, avoiding air pockets against the sidewalls, then reassemble the cap and pump 5-10 strokes with the nozzle loosened slightly to bleed trapped air. Tighten the nozzle when grease flows cleanly without air bubbles. For suction fill, immerse the nose of the gun in a grease container, pull the plunger rod back slowly while the gun draws grease through the outlet; this is slower but avoids exposing the gun interior. The S-722 and S-722CL precision minis also accept standard 3 oz. (85 g) cartridges ; unscrew the barrel, insert the cartridge nose-first with both seals peeled, screw the head back on, and prime.

Can I use a push type grease gun on zerk fittings?

Yes. Push type grease guns work with standard hydraulic zerk fittings, flush-type fittings, button-head fittings and other common grease-point types, with the appropriate connector or nozzle. The S-720 and S-721 come with a universal connector compatible with most zerk fittings. The S-720P and S-721P use a pointed connector for direct application on flush-type fittings. The S-722 and S-722CL precision minis use needle nozzles (0.7, 1.0 or 1.4 mm) for very small fittings and hammer mechanisms. Custom couplers, locking couplers, quick-release couplers and sharp-nozzle tips are available as accessories for all 6 models.

Why is my push type grease gun not pumping grease?

The most common cause is an air lock in the barrel, which happens after loading fresh grease or after long storage. To fix: loosen the nozzle or barrel by one or two turns while pumping steadily; once grease flows cleanly, retighten. If your model has a dedicated bleeder valve, open it while pumping. Other causes of no-grease output: empty barrel (refill), clogged nozzle (clean with a thin wire or solvent), worn or damaged seals (replace O-rings with the rebuild kit), or a dried grease plug in the outlet (flush with solvent). On the mini S-722/S-722CL, a clogged needle nozzle can usually be cleared with the spare nozzle supplied in the threaded pocket on the gun head.

How do I store a push type grease gun properly?

Store horizontally (preferred) or nozzle-down to prevent oil separation and grease settling away from the pump end. Cap the coupler or nozzle tip to keep dust and dirt out. Store in a clean, dry area away from direct sunlight (particularly important for plastic-body and clear-tube models where UV exposure can degrade the polycarbonate over time). For long-term storage (months), consider draining the barrel, wiping the interior with mineral spirits, drying completely, and reassembling with a light film of grease on the plunger-rod seal before the next use. The compact 30 cc S-720 fits easily in standard toolboxes; the larger 150 cc S-721P takes more space but still fits in field-service tool bags.

What grease should I use in a push type grease gun?

NLGI Grade 2 lithium-based grease is standard for most applications. For cold-weather operation (below 0°C / 32°F), use NLGI Grade 1 which flows more easily at low temperature. For food processing equipment, use NSF H1 food-grade grease and dedicate a gun exclusively to food-grade service (never use a gun that has contained non-food-grade grease for food processing). For high-temperature applications, specialty synthetic greases like PAO-based or calcium sulphonate work well. Match the grease chemistry to your equipment manufacturer's specification; never mix incompatible chemistries (lithium + calcium, lithium + polyurea) in the same gun because they form hard deposits that clog the pump and non-return valve.

Can a push type grease gun cause a grease injection injury?

Yes, though at lower pressure than lever or pistol grease guns. Push type guns operate at 1,000 PSI (69 bar) ; lower than lever action (6,000-12,000 PSI) and pistol grip (3,000-10,000 PSI), but still capable of driving grease through intact skin under the right conditions. Any fluid injection injury requires immediate emergency medical attention ; grease migrates along tissue planes, the initial wound often looks like a minor puncture, but chemical damage progresses over 24-72 hours and can require surgical treatment. Follow standard PPE: wraparound safety glasses, nitrile gloves, long sleeves. Never point the nozzle at any body part, never use the gun near open flames (grease is flammable at elevated temperatures), and inspect the gun for hose or nozzle damage before each use.

Does the plastic grease gun come with a pointed connector?

Yes. The S-720P and S-721P plastic-bodied push type grease guns ship with a pointed connector for direct application on flush-type fittings and small zerks where a universal connector would be less precise. The steel-bodied S-720 and S-721 ship with a universal connector for standard zerk fittings. The mini S-722 and S-722CL ship with three interchangeable needle nozzles (0.028" / 0.7 mm, 0.039" / 1.0 mm, 0.055" / 1.4 mm) stored in threaded pockets on the gun head for quick swap. Custom nozzle sizes, locking couplers, quick-release couplers and 4-jaw hydraulic couplers with ball check are available as accessories for all 6 models.

What are the thread options available on push type grease guns?

All 6 STAR push type grease guns accept 1/8" BSPT (British Standard Pipe Taper), 1/8" NPT (National Pipe Thread), or M10x1 (metric) thread options on the inlet connector. BSPT is the European and UK standard, NPT is the Americas standard, M10x1 is common in German and wider European industrial equipment. Custom thread specifications are available for OEM orders. Specify the thread option at order time; distributors with mixed-market customers can stock all three thread versions within the same SKU family. The 3 thread options cover virtually every international fitting standard buyers encounter.

Do you offer OEM push type grease gun manufacturing?

Yes. We provide full OEM and private label manufacturing with custom branding, logo printing, retail packaging, thread options, custom nozzles and colour-coded finishes across all 6 push type grease gun models. MOQ applies and varies by model and customisation level. We supply distributors, industrial buyers, private-label brands and automotive retail chains in over 27 countries. OEM customisation options include custom body colours on the plastic S-720P and S-721P, custom clear-tube tints on the S-722CL, custom needle-nozzle size packs on the S-722 series, and full gift-set or promotional-kit configurations. Visit our OEM partnership page for details on bulk orders, export supply, lead times and pricing.