S-712DP Lever Action Grease Gun

Frequently Asked Questions: S-712DP Dual Piston High Capacity Lever Action Grease Gun

What makes a 750 cc dual piston lever grease gun different from a 500 cc dual piston?

The 750 cc barrel carries 50 percent more bulk grease per fill while using the same 14 oz. (400 g) cartridge standard and the same dual-piston pump mechanism. The S-712DP has an extended-length barrel versus the 500 cc S-711DP, which means one fill covers a 50-fitting haul truck or 40-fitting wheel loader without a mid-machine reload. Pressure, stroke output, priming behaviour, and loading methods are identical across the two models; the decision between them comes down to how many grease points per machine the operator typically services.

How many grease fittings can a 750 cc grease gun cover per fill?

At 12 grams of grease per fitting, a 750 cc reservoir covers approximately 60 fittings per fill. At 15 grams per fitting on heavier service loads, approximately 50 fittings. In real operation this typically means one full haul truck (50-60 fittings), one large wheel loader (40-50 fittings), one combine harvester with implements, or the chassis plus fifth wheel of a semi-tractor plus trailer. For service routes where machines have fewer than 30 fittings each, the 500 cc S-711DP is the more balanced choice because the smaller gun is lighter and more compact between fittings.

Does a 750 cc grease gun still use standard 14 oz. (400 g) cartridges?

Yes. The S-712DP's 57.15 mm barrel diameter matches the worldwide 14 oz. (400 g) cartridge standard, so stocked cartridges from any major grease supplier fit without adapters. The extra 250 cc of capacity versus the 500 cc S-711DP comes from the extended barrel length, which leaves additional headroom above the cartridge seat. Operators can run cartridges exclusively and treat the gun as a 400 g cartridge gun, or bulk-fill the full 750 cc from pail grease when lower per-kilogram cost matters more than the convenience of cartridge loading.

Why does the S-712DP have a longer barrel than the S-711DP?

The extended barrel adds 250 cc (50 percent) of bulk grease capacity at the same 57.15 mm diameter, so standard 14 oz. (400 g) cartridges still fit but bulk fills carry significantly more grease. The alternative to a longer barrel would be a wider diameter barrel, which is the approach used on the 63.5 mm S-713DP and S-714DP but requires the 450 g wide-barrel cartridge format used in Australia and New Zealand. The longer-barrel approach on the S-712DP keeps cartridge compatibility worldwide while still expanding bulk capacity.

How long does it take to bulk-fill a 750 cc lever grease gun?

Approximately 40 to 50 seconds of scooping and packing, versus 25 to 30 seconds on a 500 cc gun. The extra fill time on the 750 cc barrel is traded against fewer reload stops per shift. On a typical 10-machine fleet service day with 40 fittings per machine, a 500 cc gun requires roughly 15 reloads over the shift (60 seconds each) while a 750 cc gun requires roughly 10 reloads (80 seconds each), saving around 500 seconds total plus the walk time to and from the tool bench for 5 fewer reload trips. The time saving compounds further when the tool bench is remote from the machines (agricultural field service, mining pit service).

Can I use a dual piston 750 cc grease gun for a semi truck?

Yes. Semi-tractor service is one of the primary use cases for the S-712DP. A semi tractor has 25 to 35 grease points on the chassis (kingpin, tie rods, slack adjusters, U-joints, driveshaft fittings) plus 5 to 10 points on the fifth wheel. The matching trailer adds 10 to 20 points on axle kingpins, landing gear, and king pin. At 12 g per fitting the full tractor-trailer needs 500-700 g of grease, fitting comfortably in a single 750 cc fill with a small margin. Use a dedicated gun for fifth-wheel grease (a high-tack open-gear formulation) to avoid mixing with the standard chassis EP grease.

Is a 750 cc dual piston lever grease gun heavier than a 500 cc?

Yes, approximately 250 to 300 g heavier when loaded with bulk grease. Empty gun weight differs by around 100-150 g because of the extra barrel material. Fully bulk-filled, the S-712DP at 750 cc of grease (roughly 700 g of grease) versus the S-711DP at 500 cc (roughly 470 g) adds about 230 g of grease weight. For operators servicing large equipment where the gun stays in one hand between fittings on the same machine, the extra weight is rarely a fatigue factor; for routes where the operator carries the gun between widely spaced machines, the smaller 500 cc gun reduces carry fatigue.

Does the dual grease inlet work the same on the 750 cc barrel?

Yes. The dual grease inlet is in the head, not the barrel, so it functions identically across the 500 cc, 650 cc, 750 cc, and 900 cc members of the dual-piston family. On the taller grease column of the 750 cc barrel, the dual inlet is arguably more useful because there are more opportunities for the column to pull away from a single feed channel during cold-weather or partial-fill reloads. Single-inlet 750 cc lever guns on the market frequently require 10 to 15 priming strokes on a cold reload; the S-712DP typically primes within 3 to 5 strokes regardless of fill level or temperature.

Can I use the S-712DP for mining haul truck service?

Yes. Mining haul-truck service is one of the primary design targets for the S-712DP. A typical off-highway dump truck has 50 or more grease points across suspension struts, steering cylinders, kingpins, driveshaft centre bearings, rear suspension arms, and the dump body pivots. At 12-15 g per fitting the whole machine needs 600-750 g of grease, matching the 750 cc capacity. The 12,000 PSI pressure clears the crusted zerks that are routine on pit-exposed equipment, and the dual inlet keeps priming reliable despite overnight temperature cycling between service intervals.

How much grease does a wheel loader need per service?

Typically 400 to 550 grams across 30 to 40 fittings, fitting comfortably in one S-712DP fill with grease to spare. Wheel loader grease points cluster on the articulation joint (4-6 pins), the bucket linkage (8-12 pins), the boom arms (4-6 pins), the steering cylinders (4 fittings), the front and rear axle pivots, and the driveshaft. At 12-15 g per fitting the full service uses 400-550 g. For larger wheel loaders (30+ tonnes) the fitting count climbs to 50+ and the grease requirement approaches the full 750 cc, making the S-712DP correctly sized for one-pass service.

Is the 750 cc capacity useful for workshop service?

Usually no. For workshop bench service on automotive chassis, small agricultural machinery, and light equipment where a typical machine has fewer than 20 grease points, a 500 cc gun is adequate and the smaller format is easier to handle between fittings. The 750 cc capacity pays back when machines are large (40+ fittings) or when service routes cover multiple machines before the next reload opportunity. In single-bay workshop operation the 750 cc reservoir typically sits half-empty between uses, which increases oil-bleed separation over time. For workshop service pick the 500 cc S-711DP; keep the S-712DP for field service and large-equipment routes.

How do I prime a 750 cc dual piston grease gun?

Load the reservoir, release the plunger rod from the side slot, crack the head a quarter turn, and pump the lever 3 to 5 full strokes with the coupler disconnected. Grease should flow from the head seam by the second or third stroke because both dual-inlet channels draw simultaneously. The priming stroke count is the same on the 750 cc barrel as on the 500 cc despite the taller grease column, because priming depends on the dual-inlet architecture and the follower spring pressure, not on the reservoir size. Retighten the head when grease flows without air bubbles. If priming takes more than 5 strokes on a warm reload, check that the plunger rod is released so the follower spring compresses the column against the head.

What is the difference between a 750 cc lever gun and a 900 cc lever gun?

The 900 cc S-714DP uses a wider 63.5 mm barrel and the 450 g cartridge format used in Australia and New Zealand; the 750 cc S-712DP uses the standard 57.15 mm barrel and the worldwide 14 oz. (400 g) cartridge. For buyers outside the Australian/NZ market the S-712DP at 750 cc is typically the more practical choice because the standard cartridge format is stocked universally. For buyers in Australia, New Zealand, or markets that primarily use the wide-barrel cartridge, the 900 cc S-714DP gives more capacity and better cartridge fit. Both use the same dual-piston mechanism and 12,000 PSI pressure rating.

Can I use the S-712DP in cold-weather service?

Yes. The dual grease inlet is particularly valuable in cold-weather service because cold grease thickens and pulls away from single-channel feed paths, causing priming failures on reload. On the S-712DP's dual-inlet head, even if one channel draws air during a cold reload, the second channel still feeds grease to the pump and priming succeeds on the first or second stroke. Operators in Canadian winters, Scandinavian service, Russian heavy-equipment maintenance, and high-altitude mining sites regularly use the S-712DP at temperatures down to around -10°C with standard NLGI 2 grease, and lower temperatures with NLGI 1 or NLGI 0 cold-weather formulations.

How do I switch grease types in a 750 cc lever grease gun?

Empty the reservoir, unscrew the head and barrel, wipe out old grease with a lint-free rag, solvent-flush the head and barrel with mineral spirits, dry completely, lightly re-grease the plunger rod seal with a compatible grease, and reload with the new grease. The longer barrel of the 750 cc S-712DP means the flush procedure removes more residue than on a 500 cc gun; use extra rag passes on the barrel interior and give the solvent flush an extra minute to dissolve adhered grease. Workshops handling multiple grease chemistries (lithium, calcium, polyurea, moly-fortified EP) should keep separately labelled dedicated guns per grease type to avoid repeat flush procedures and the risk of cross-contamination damaging pumps.

Does the S-712DP work with food-grade grease?

Yes, the S-712DP is mechanically compatible with NSF H1 food-grade greases. For food-processing service, use a dedicated gun exclusively for food-grade grease and never cross-contaminate with industrial chassis or EP greases. Food-grade grease is typically a lighter NLGI grade (NLGI 1 or NLGI 2) formulated with mineral oil or synthetic bases acceptable for incidental food contact. The dual-piston pump mechanism handles food-grade viscosity without modification. For food-processing plants servicing conveyor drives, bottling lines, and packaging equipment, the 750 cc capacity reduces the number of specialty food-grade cartridge changes, which in turn reduces the contamination-risk windows during reload.