S-712DP/PRO Lever Action Grease Gun
The STAR S-712DP/PRO Professional Dual Piston Lever Action Grease Gun is the professional-tier 750 cc member of the STAR dual-piston family, built for the same high-volume service work as the base S-712DP but with two pro-grade upgrades: a moulded rubber sleeve on the barrel for extended-shift grip comfort in greasy hands, and a premium accessory kit that ships with pointed connector and flexible hose included as standard rather than as optional extras. Same dual-piston mechanism delivering 2.4 g per stroke, same full 12,000 PSI (830 bar) pressure rating, same dual grease inlet and variable stroke features.
We at STAR built the S-712DP/PRO for two distinct buyer groups: lubrication technicians spending 6-8 hours per shift on grease routes where hand fatigue from a knurled-only barrel becomes real, and distributors positioning a premium SKU at the top of the dual-piston family. The rubber sleeve absorbs vibration from repeated lever strokes, insulates the operator's palm from barrel heat that builds up in hot-climate service, and provides a slip-resistant surface that works with or without gloves. The premium accessory kit bundles a pointed connector for flush-type grease fittings and a 300 mm flexible hose for access-constrained work alongside the standard 150 mm steel extension and hydraulic coupler. Four-way loading (cartridge, bulk pack, suction fill, filler pump) on the CNC-machined aluminium die cast head completes the specification.
Rugged Build Quality
- Moulded rubber sleeve on the barrel. A purpose-fitted elastomer sleeve wraps the barrel, adding slip resistance in oily or wet hand conditions, damping the shock transmitted from the dual-piston pump strokes to the operator's palm, and insulating the operator from the barrel-wall temperature rise that happens during extended pumping sessions in hot climates. The sleeve is fixed in place and does not shift during use. On service routes where the gun is held through 200 or more strokes per machine, the rubber sleeve is the single feature that most reduces end-of-shift grip fatigue.
- Premium accessory kit included as standard. The S-712DP/PRO ships with four accessories in the box: 150 mm steel extension for accessible fittings, 300 mm flexible hose for tight spots, pointed connector for flush-mount grease fittings (common on agricultural equipment and motorcycle swing arms), and hydraulic coupler. Buyers of the base S-712DP typically order pointed connectors and flex hoses as separate line items; on the pro variant these are bundled in, reducing distributor line-item complexity and giving the end operator a complete service kit out of the box.
- Dual-piston pump mechanism delivering 2.4 g per full lever stroke. Two pistons work in parallel on every stroke of the handle, so each stroke moves roughly three times the grease of a standard single-piston gun (whose spec is typically 1 g per stroke). On a 50-fitting haul-truck service round that takes 600 standard strokes at 1 g each, the S-712DP/PRO completes the same round in roughly 250 strokes, closer to a third of the pumping time, which compounds across multi-machine routes and full-shift operations.
- Dual grease inlet for prime reliability. Grease reaches the pump through two separate feed channels in the head instead of one. If air gets into one channel (common in sub-zero conditions where grease thickens, during partial-fill reloads, or after the gun has sat in storage for weeks), the second channel still feeds the pump. The first pump of the lever after reload produces grease, not a dry stroke, which eliminates the priming dance that single-inlet guns sometimes require in cold or neglected service.
- Variable stroke mechanism. The lever geometry is designed so that a partial swing (say, 30 or 40 percent of the full arc) still builds the full 12,000 PSI pressure at the coupler. This matters on fittings where a full lever swing is blocked by surrounding machine structure: excavator pin clusters where the hydraulic lines sit close, wheel-loader articulation joints behind chassis members, overhead service points with low ceiling clearance. The operator can pump through whatever arc is available and still move grease at full pressure.
- Extra-long 24 oz. (750 cc) barrel. Carries 50 percent more grease than the 500 cc entry member of the dual-piston family, at the same 57.15 mm inner diameter. Standard 14 oz. (400 g) worldwide cartridges still fit, with room above the cartridge seat for additional bulk grease. Covers a full 50-fitting haul truck or 40-fitting wheel loader on one reservoir.
- High-tolerance CNC-machined aluminium die cast head. The head is cast from aluminium then CNC-finished to tight tolerances, so grease passages, the non-return valve seat, piston bore and coupler thread stay aligned under repeated 12,000 PSI cycling. Lighter than a steel head without sacrificing dimensional accuracy.
- Robust barrel in 0.049" (1.2 mm) cold-drawn steel. The barrel wall is drawn through a die at room temperature, which work-hardens the steel for predictable strength at 1.2 mm thickness. The rubber sleeve fits over the cold-drawn steel barrel; if the sleeve is ever damaged or worn, the underlying barrel is fully functional on its own.
- Extra-heavy follower spring sized for the 750 cc barrel. A stronger-than-standard compression spring sits behind the follower plate and keeps the grease column pressed firmly against the pump, even at low fill levels in the longer barrel. Standard springs can lose prime at half-empty fills on a 750 cc barrel because the grease column height is taller than on shorter reservoirs; the heavier spring prevents that.
- Rolled threads on the barrel-to-head joint. Rolled threads displace steel under pressure rather than cutting it away, which work-hardens the surface for stronger, smoother engagement. Important on a joint that gets unscrewed every cartridge swap or bulk reload: rolled threads survive thousands of reload cycles without cross-threading.
- Machined non-return valve in the head. A precision-machined one-way valve sits between the pump chamber and the coupler outlet. It opens during a pump stroke and closes between strokes to hold peak pressure, so the grease column does not bleed back. Without it, partial strokes would never build the 12,000 PSI needed to clear a crusted fitting.
- Knurled barrel grip under the rubber sleeve. The barrel surface has a machined cross-hatch pattern underneath the elastomer sleeve. Provides redundant tactile grip if the rubber sleeve ever slips or is removed for cleaning. No moving parts, does not wear out over the life of the gun.
- Non-slip textured powder-coated body. Electrostatic powder coating with a textured surface finish on the head, lever, and reservoir body. Resists corrosion in humid climates, marine service, chemical plants, and wet outdoor use. The texture also adds grip on the handle sections for long service sessions.
- 12,000 PSI (830 bar) maximum working pressure. This is the full pressure rating for any hand-operated grease gun. The pressure matters because grease fittings on equipment that sits outdoors between service intervals develop crusts from dust, moisture, and oxidation: a crusted zerk at 6,000 PSI will often refuse fresh grease and the operator has to skip the fitting or double-pump it. At 12,000 PSI, the gun punches through the crust reliably on the first or second stroke, ensuring every fitting on the service round actually receives fresh grease.
- 4-way loading: cartridge, bulk pack, suction, filler pump. Workshops use 14 oz. (400 g) cartridges, fleet depots bulk-pack 750 cc from 5 kg, 15 kg or 18 kg pails for lower per-kilogram cost, agricultural operators suction-fill from open containers, high-volume depots use filler pumps for rapid reload across multiple guns. The S-712DP/PRO accepts all four formats without conversion kits or head swaps.
Features / Loading Options
The S-712DP/PRO accepts grease from all four industry-standard supply formats: cartridge, bulk pack, suction fill, and filler pump. The variable stroke mechanism is part of the same package and lets operators build full 12,000 PSI pressure on partial lever swings.
Variable StrokePartial swings, full pressure
Cartridge Loading14 oz. (400 g)
Bulk Loading24 oz. / 750 cc
Suction Filling
Filler Pump
How the S-712DP/PRO Works
The S-712DP/PRO works in three stages: load, prime, pressurise and dispense. The rubber sleeve and the extra accessories change the operator experience around the machine but not the core pumping mechanism, which is the same dual-piston platform as the base S-712DP.
- Load. Choose one of four loading methods depending on your grease supply. For cartridge fill, retract and lock the plunger rod, unscrew the barrel (the rubber sleeve grips easier than knurling alone if hands are greasy), peel the metal pull-tab off a standard 14 oz. (400 g) cartridge, insert nose-first, peel the plastic bottom seal, and screw the head back on. For bulk pack, retract and lock the plunger, unscrew the barrel, dip the barrel mouth into a 5 kg, 15 kg or 18 kg grease pail, and pack grease firmly against the sidewalls with a scoop to fill the 750 cc reservoir. For suction fill, retract and lock the plunger with the barrel attached, dip the gun nose into an open grease container, and release the plunger rod slowly so the follower spring draws grease into the reservoir. For filler pump fill, connect a hand-operated or pneumatic filler pump to the 1/8" BSPT inlet on the head and push grease in under pressure.
- Prime. Release the plunger rod from the side-slot lock so the extra-heavy follower spring compresses the grease column against the dual-inlet head. Crack the head a quarter turn to open the air release path, then pump the lever 3 to 5 full strokes with the coupler disconnected. Grease should flow from the head seam on the second or third stroke because both dual-inlet feed channels draw simultaneously. Retighten the head when grease flows without bubbles. In cold weather or after long storage, the dual inlet keeps priming within 5 strokes even when grease has thickened.
- Pressurise and dispense. Choose the right accessory for the fitting: the 150 mm steel extension for accessible fittings, the 300 mm flexible hose for fittings behind machine structure, or the pointed connector for flush-mount fittings without a protruding zerk. Connect to the grease fitting and pump. Each full lever stroke drives both pistons in parallel, moving 2.4 g of grease through the non-return valve into the coupler at up to 12,000 PSI (830 bar). The rubber sleeve gives the operator a firm grip through the pumping arc, reducing hand slippage during high-pressure pumps on crusted fittings. Pump until fresh grease appears at the bearing seal, then disconnect.
The S-712DP/PRO runs on lever power only: no battery, no compressor, no electrical supply. The target buyer is the professional operator or fleet technician spending enough time on grease routes that the rubber-sleeve grip and the bundled accessory kit pay back daily, and the distributor positioning a premium dual-piston SKU at the top of the family. For operators needing the same mechanism and capacity without the rubber sleeve or premium accessory bundle, the base S-712DP is the lower-priced alternative.
| Parameter | Value |
|---|---|
| Model | S-712DP/PRO |
| Type | Professional Manual Lever Action Grease Gun - Dual Piston |
| Mechanism | Dual Piston, Lever Type (Hand Operated) |
| Delivers | 2.4 g / Stroke (1 oz. / 12 Strokes) |
| Pressure Developed | 12,000 PSI (830 bar / 83 MPa) |
| Filling Options | Cartridge, Bulk, Suction, Filler Pump (4-way) |
| Cartridge Capacity | 14 oz. (400 g) standard grease cartridge |
| Bulk Capacity | 24 oz. / 750 cc |
| Barrel Diameter (Ø) | 57.15 mm / 2-1/4" |
| Barrel Wall Thickness | 0.049" / 1.2 mm cold-drawn steel |
| Barrel Grip | Moulded rubber sleeve over knurled steel |
| Head Material | CNC-machined Aluminium Die Cast |
| Dual Grease Inlet | Yes (prevents loss of prime in cold weather and partial fills) |
| Variable Stroke | Yes (full pressure on partial lever swings) |
| Body Finish | Non-slip textured powder coating |
| Thread Options | 1/8" BSPT / 1/8" NPT / M10 x 1 / Custom |
| Standard Accessories Included | Steel extension + flexible hose + pointed connector + hydraulic coupler (premium kit) |
| Coupler | Hydraulic coupler (standard), 4-jaw with ball check (optional) |
| Grease Grade Compatibility | NLGI 1, NLGI 2, NLGI 3 (lithium, calcium, aluminium complex, polyurea, moly-fortified EP) |
| Operating Temperature | -10°C to +80°C |
| Country of Origin | India (Made in Ludhiana) |
| Certifications | ISO 9001:2015, CE, RoHS compliant |
| HS Code | 8205 |
| Warranty | 1 year against manufacturing defects |
| OEM / Private Label | Available (MOQ applies) |
The S-712DP/PRO ships as a complete premium service kit. Unlike the base S-712DP where the flexible hose and pointed connector are ordered as separate line items, the pro variant bundles all four accessories as standard.
6" (150 mm) Steel Extension
12" (300 mm) Flexible Hose
Pointed Needle-Nose Connector
Hydraulic Coupler
Instruction Manual
6" (150 mm) Steel Extension
12" (300 mm) Flexible Hose
Hydraulic Coupler
Instruction Manual
Accessory bundle per distributor specification
Private-label packaging available
MOQ applies
Contact us
The standard S-712DP/PRO kit includes both the 150 mm steel extension for accessible fittings and the 300 mm flexible hose for tight spots, plus the pointed connector for flush-type grease fittings. Distributor-specification kits can add or substitute accessories per bulk order agreement. Contact us for custom kit configurations.
Four engineering and packaging choices define the S-712DP/PRO's position as the pro-tier 750 cc member of the dual-piston family. The first two are visible differentiators over the base S-712DP; the other two anchor the core mechanism.
The S-712DP/PRO targets the professional operator spending long hours on grease routes, and the distributor positioning a premium dual-piston SKU with a complete accessory kit. Same fitting-count and machine-size profile as the base S-712DP, but weighted toward buyers where ergonomics and accessory completeness matter.
S-712DP/PRO Variants & Related Models
S-711DP Dual Piston Lever Action Grease Gun - Entry Tier (15 oz. / 500 cc)
15 oz. / 500 cc
14 oz. (400 g) cartridge
Entry Tier (Compact Format)
S-712DP Dual Piston Lever Action Grease Gun - High Capacity (24 oz. / 750 cc)
24 oz. / 750 cc
14 oz. (400 g) cartridge
High Capacity (750 cc)
S-713DP Dual Piston Lever Action Grease Gun - Wide Barrel (20 oz. / 650 cc)
20 oz. / 650 cc
450 g cartridge
Wide Barrel (Australian/NZ)
S-714DP Dual Piston Lever Action Grease Gun - Extra Long Barrel (30 oz. / 900 cc)
30 oz. / 900 cc
450 g cartridge
Wide Barrel (Australian/NZ)
Compatible Accessories
Flexible Hoses
Additional and replacement lengths
(12", 24", 36" and more)
Steel Extensions
Additional and replacement lengths
(6", 18", 24" and more)
Couplers & Connectors
All types available
(hydraulic, 4-jaw, pointed, quick-release)
All Grease Gun Accessories
Full range available
(follower plates, seals, bulk loaders)
Related Product Categories
Buying Guide: When the S-712DP/PRO is the Right Choice
The S-712DP/PRO is the professional-tier 750 cc dual-piston grease gun, built for operators who spend enough of their shift on grease routes that the rubber-sleeve grip and the bundled premium accessory kit pay back daily, and for distributors positioning a complete service kit at the top of the dual-piston family. It is the right pick when extended-shift ergonomics, accessory completeness, or retail positioning matter. It is not the right pick for buyers focused purely on mechanism cost who do not value the rubber sleeve or bundled accessories.
Pick the S-712DP/PRO for full-time lubrication technicians on 6-8 hour grease routes
Fleet maintenance technicians, mining service operators, agricultural contractor crews, and plant-maintenance lube specialists spending most of their shift holding a grease gun through repeated pumping: the rubber sleeve reduces hand fatigue measurably compared with a knurled-only barrel, the heat insulation matters in hot-climate service, and the slip resistance works with or without gloves. Over a five-day working week, end-of-shift grip fatigue is noticeably lower on the pro variant than on the base S-712DP.
Pick the S-712DP/PRO when a complete service kit matters at unboxing
Retail buyers, gift-kit buyers, corporate service-kit buyers, and OEM-toolkit buyers who expect a complete accessory bundle rather than a list of separately-ordered line items: the pro variant ships with steel extension, flexible hose, pointed connector, and hydraulic coupler as standard. Unboxing produces a ready-to-use set of service tools covering accessible fittings (extension), tight spots (flex hose), flush-mount fittings (pointed connector), and standard zerks (coupler). No follow-up accessory orders to complete the kit.
Step down to the base S-712DP for cost-sensitive buyers who will order accessories separately
For fleet operators who already stock flex hoses, pointed connectors, and specialty couplers separately, and who do not specifically value the rubber sleeve ergonomics, the base S-712DP at the same 750 cc capacity and 12,000 PSI rating is the lower-cost pick. Same dual-piston mechanism, same dual inlet, same variable stroke, same barrel and head. The pro tier differentiators are ergonomic and packaging, not mechanical.
Step down to the S-711DP for compact-format service
For light trucks, small tractors, compact construction equipment, and workshop service where a typical machine has fewer than 30 grease points, the S-711DP at 500 cc is sized right. Same dual-piston mechanism without the rubber sleeve or premium accessory bundle, in a lighter, more compact format that carries easier between service points.
Step up to the wide-barrel Entry Tier (Compact Format) or S-714DP for Australia/NZ 450 g cartridge markets
Markets where the wide-barrel 450 g cartridge format is the stock standard (Australia, New Zealand) need the wide-barrel dual-piston variants: the S-713DP at 650 cc or S-714DP at 900 cc. The S-712DP/PRO uses the standard 57.15 mm barrel and 14 oz. (400 g) cartridge standard, which is stocked everywhere except those two specific markets.
Consider the Quadra-Cut steel Wide Barrel (Australian/NZ) for drop-heavy environments
Construction contractor yards, mining pit-side service, heavy-handed tool environments: aluminium die cast heads can crack from repeated concrete drops. The S-707 uses a forged steel head with Quadra-Cut Precision machining at 500 cc capacity and the same 12,000 PSI rating. No rubber sleeve, single-piston output, smaller reservoir, but drop-tolerant in a way aluminium heads are not.
For OEM, distributor and fleet-service trade buyers
The S-712DP/PRO is the premium-margin SKU in the dual-piston family for distributors targeting professional mechanics, mining service supply, and agricultural equipment dealership trade channels. The rubber-sleeve + premium-accessory-kit combination commands noticeably higher margins than the base S-712DP while sharing the same manufacturing platform. Contact the STAR export team for private-label packaging, regional thread variants, distributor-specification kit bundles, and mixed-container consolidation.
Frequently Asked Questions: S-712DP/PRO Professional Dual Piston Lever Action Grease Gun
What makes the S-712DP/PRO different from the base S-712DP?
Two upgrades: a moulded rubber sleeve on the barrel for extended-shift grip comfort, and a premium accessory kit that includes a pointed connector and flexible hose bundled with the standard steel extension and hydraulic coupler. The dual-piston pump mechanism, 12,000 PSI pressure rating, 750 cc bulk capacity, 14 oz. (400 g) cartridge compatibility, dual grease inlet, and variable stroke are identical across both models. The pro tier is a packaging and ergonomics upgrade on a shared mechanical platform, not a different gun.
How much does the rubber sleeve on a professional grease gun actually help with grip fatigue?
Measurably on service routes of 200+ strokes per machine across 5-10 machines per shift, noticeably less on shorter service loads. The elastomer damps the shock transmitted from each dual-piston lever stroke into the operator's palm, which on a 12,000 PSI gun is a real repetitive load. Operators comparing the two variants across a working week typically report lower end-of-shift hand stiffness on the pro variant. For single-machine bench service or occasional workshop use, the difference is below the noise floor and the base S-712DP is adequate.
Does the rubber sleeve on the S-712DP/PRO resist grease and solvents?
Yes. The sleeve is a nitrile or NBR-type elastomer chosen for compatibility with petroleum-based greases, light-oil splashes, and the mineral-spirit solvents commonly used in workshop cleaning. Aggressive aromatic solvents (acetone, toluene, xylene) should be kept off the sleeve because prolonged contact will soften or swell the elastomer. Routine wipe-down with a rag and light solvent does not damage the sleeve. If the sleeve is ever damaged or worn, the underlying knurled steel barrel is fully functional on its own, so sleeve damage does not remove the gun from service.
What accessories ship as standard with a professional dual piston grease gun?
Four accessories in the box: 150 mm (6-inch) steel extension for accessible fittings, 300 mm (12-inch) flexible hose for tight spots, pointed connector for flush-mount grease fittings, and hydraulic coupler for standard zerks. The base S-712DP ships with just the steel extension and hydraulic coupler; buyers order pointed connectors and flexible hoses as separate line items. Bundling all four accessories into the pro kit eliminates follow-up orders, reduces distributor line-item complexity, and gives the operator a complete service tool set out of the box.
What is a pointed connector on a grease gun used for?
A pointed connector is used on flush-mount grease fittings where a protruding zerk would be damaged by catching on machine structure or by being hit during operation. Common applications: motorcycle swing-arm pivots, trailer king pins, certain agricultural-equipment hinge points, and small industrial-machinery bearing housings where the fitting opening is cast or drilled flush into the housing surface. A standard hydraulic coupler has nothing to clamp onto on a flush fitting; the pointed connector has a tapered nose that presses into the grease channel and seals by contact pressure instead. The S-712DP/PRO kit includes one pointed connector as standard.
Can the S-712DP/PRO rubber sleeve be removed?
Yes, the sleeve can be removed for deep cleaning or barrel inspection by sliding it off the barrel end, though it is not intended to be swapped in regular service. To remove, retract and lock the plunger rod, unscrew the head and remove the barrel from the gun body, wipe the outside of the barrel clean, grip the sleeve end and slide it off. The underlying knurled steel barrel is fully functional on its own. To reinstall, wipe the barrel clean and dry, apply a thin film of silicone lubricant to the barrel exterior for easier re-installation, and slide the sleeve back on. Do not use petroleum-based lubricant on the sleeve interior because prolonged contact can swell the elastomer.
Does a professional dual piston grease gun perform differently from the 750 cc model mechanically?
No. The dual-piston pump, dual grease inlet, variable stroke, 12,000 PSI pressure rating, 2.4 g per stroke output, 14 oz. (400 g) cartridge compatibility, and 750 cc bulk capacity are identical between the S-712DP/PRO and the base S-712DP. The performance difference is purely operator-side: the rubber sleeve reduces hand fatigue on long pumping sessions, the bundled pointed connector lets the operator service flush-mount fittings without a separate order, and the flex hose in the standard kit reaches tight spots immediately. Service spec measured at the coupler is the same on both.
How does a pro-tier grease gun justify the price premium over the 750 cc model?
Through end-of-shift operator fatigue reduction on long grease routes and through accessory-bundle consolidation for retail and dealership trade. For full-time lubrication technicians the rubber sleeve delivers measurable hand-fatigue reduction across a working week, which has real productivity value on multi-machine routes. For distributors and retailers the bundled premium accessory kit allows higher unit margins than the base SKU plus separately-ordered accessories, and simplifies SKU stocking at the distributor level. For buyers who want the mechanism only and will source accessories themselves, the base S-712DP is the lower-cost pick.
Is the S-712DP/PRO suitable for hot-climate service?
Yes, and the rubber sleeve is particularly useful in hot-climate operation because it insulates the operator's palm from barrel-wall temperature rise. On bare-steel barrels during extended pumping sessions in ambient 35°C+ conditions (Middle East, equatorial Africa, tropical Asia summer service), the barrel wall can reach uncomfortable touch temperatures from the combination of external heat and internal pump friction. The elastomer sleeve acts as a thermal insulator between the barrel and the operator's palm, keeping the grip surface at a comfortable temperature for continuous pumping. Keep the gun out of direct sunlight between service cycles to prolong the sleeve lifespan.
Can I refit the rubber sleeve to a base S-712DP barrel myself?
In principle the sleeve could be sourced as a spare part and fitted to a base S-712DP barrel because the barrels are the same diameter, but in practice we recommend ordering the S-712DP/PRO as a complete SKU rather than trying to upgrade a base unit. The sleeve is supplied as a fitted moulding with specific dimensions for factory installation, and consistent hot-air or heat-gun application during fitting is needed to achieve the tight fit that keeps the sleeve from sliding during use. For fleet operators starting from a base gun who want to add the rubber grip retrospectively, the STAR spare parts catalogue lists the sleeve as a replacement part; contact the sales team for detailed fitting guidance.
How long does the rubber sleeve on a professional grease gun last?
Typically 2 to 4 years of continuous professional use, depending on solvent exposure, UV exposure, and storage conditions. Elastomers age by two mechanisms: chemical degradation from aggressive solvents that the sleeve would not encounter in normal service, and slow hardening from UV exposure that matters if the gun is stored outdoors. For indoor workshop storage with routine petroleum-grease contact and occasional mineral-spirit wipe-down, sleeve life is typically 4 years or more. For outdoor utility-vehicle storage in direct sunlight, sleeve life may be shorter. The sleeve is a wear part and is listed in the spare parts catalogue; when it hardens and loses grip, replacement takes a few minutes with a heat gun.
Does the S-712DP/PRO work with gloved hands?
Yes, the rubber sleeve is designed to provide tactile grip with or without gloves, including nitrile, leather, and mechanic's fabric gloves. The sleeve surface has a moulded texture that engages glove materials without needing a bare-hand friction grip. On cold-weather service where thick winter gloves are worn, the sleeve still provides better grip than a knurled-only barrel because the elastomer deforms slightly under glove pressure and increases the contact area. For extreme winter service with heavy mittens, a secondary hand strap can be retrofitted from the STAR accessory range.
Which is better for a distributor SKU, the base S-712DP or the S-712DP/PRO?
Both, for different trade segments. The base S-712DP targets fleet operators sourcing mechanism-only at the lowest per-unit cost; the S-712DP/PRO targets retail and dealership trade where unit margin and accessory-bundle consolidation matter more than absolute per-unit cost. Distributors typically stock both SKUs and position them against different buyer profiles: the base unit for wholesale fleet tenders where per-unit price drives the decision, the pro unit for dealership service departments, agricultural equipment retailers, and corporate-gift service kits. Mixed-container consolidation on bulk orders keeps the stocking cost of carrying both SKUs manageable.
Can the S-712DP/PRO be used in food-processing environments?
Yes, with NSF H1 food-grade grease only and a dedicated gun reserved exclusively for food-grade service. The rubber sleeve is food-safe in indirect contact (operator's hand, not the grease itself), and the 12,000 PSI dual-piston mechanism handles food-grade NLGI 1 or NLGI 2 viscosities without modification. Food-processing plants using the S-712DP/PRO should keep the gun labelled and reserved for food-grade grease, store it separately from industrial-grease units, and follow the plant's HACCP cleaning protocol for shared service tools. The 750 cc capacity is sized for conveyor-drive service and packaging-line lubrication routes with dozens of fittings.
What is the recommended maintenance schedule for the S-712DP/PRO?
Wipe-down and visual inspection after every shift; seal and O-ring inspection every 3 months of continuous use; full strip-and-clean every 6 to 12 months depending on service intensity. The maintenance schedule is the same as for the base S-712DP because the underlying mechanism is identical. Specific pro-tier additions: visually inspect the rubber sleeve for splits, tears, or hardening at the 6-month service interval; check that the sleeve has not shifted on the barrel after heavy pumping sessions. The bundled flex hose should be inspected for bulges, kinks, or stiffening at each service interval and replaced if any are found; 12,000 PSI through a compromised hose is a safety risk.
Does the pro-tier accessory bundle include a carrying case?
The standard S-712DP/PRO kit does not include a carrying case; the case is available as a cost-added option on distributor-specification orders. The standard bundle consists of the gun, 150 mm steel extension, 300 mm flexible hose, pointed connector, hydraulic coupler, and instruction manual, typically packaged in a branded retail box. For distributor private-label orders wanting a complete carrying case solution, blow-moulded plastic cases and fabric roll-bags are available as a specification add. Contact the STAR sales team with kit requirements at order time.
Is the S-712DP/PRO heavier than the base S-712DP?
Slightly, by around 100 to 150 g from the rubber sleeve and the extra accessories in the box, but the ergonomic grip makes the gun feel lighter in use during extended service sessions. Empty gun weight difference is almost entirely from the moulded elastomer sleeve wrapping the barrel. Fully loaded and kitted out, the pro variant is within 150 g of the 750 cc model. For operators who push through 200+ strokes per machine across a shift, the perceived-weight benefit from the grip-fatigue reduction outweighs the real-weight increase from the rubber sleeve.
Is the S-712DP/PRO a good first grease gun for someone new to equipment lubrication?
Yes. The complete accessory kit removes the learning curve of "which connector fits which fitting" and the rubber sleeve makes handling the high-pressure gun more forgiving for operators still developing grip control on a 12,000 PSI lever tool. The steel extension covers accessible Zerk fittings, the flexible hose reaches tight spots without needing machine repositioning, the pointed connector handles flush-mount fittings, and the hydraulic coupler handles standard zerks. A first-time user gets all four fitting-style scenarios covered out of the box. The ergonomic grip also reduces the intimidation factor of the 830 bar pressure rating during the operator's first few service sessions.
Can I use the S-712DP/PRO to service flush-type (button-head) grease fittings?
Yes, and the pointed connector in the bundled accessory kit is specifically the accessory for this fitting type. Flush-type fittings sit flush with the housing surface instead of protruding as a zerk does, and are common on motorcycle swing arms, agricultural-equipment hinge points, some industrial bearing housings, and modern equipment where a protruding zerk would catch and shear off. Unscrew the hydraulic coupler from the head, screw the pointed connector in its place, press the tapered nose firmly into the fitting's grease channel, and pump as normal. The seal is by contact pressure, so keep steady pressure on the gun during pumping. Disconnect by releasing lever pressure first, then pulling straight back.
Can the 300 mm flexible hose bundled with the S-712DP/PRO burst under 12,000 PSI pressure?
No, the hose is rated for the full 12,000 PSI working pressure and typically has a burst pressure 3 to 4 times above that. Failure under normal pumping is not expected. Causes of premature hose failure in service: repeated sharp kinking that fatigues the internal reinforcement, abrasion from dragging the hose across concrete, chemical attack from aromatic solvents left in contact with the rubber outer layer, or UV-hardening from outdoor storage over years. Inspect the hose before each use for bulges, kinks, stiffening, or visible damage to the rubber outer; replace immediately if any are found. Replacement hoses are listed as a spare part and use the same 1/8" BSPT/NPT/M10 thread as the gun head.
How should I store the S-712DP/PRO with its full accessory kit?
Cap the coupler and pointed connector nozzles with the supplied plastic caps, relieve barrel pressure by cracking the head a quarter turn for 30 seconds, store the gun nozzle-down or horizontal, and keep all accessories together in the original kit box or a dedicated tool tray. Storing accessories loose risks losing the pointed connector (the small item most likely to go missing), and leaving the coupler uncapped lets grease bleed out and attract dust between service cycles. For cold-climate storage, keep the gun indoors rather than in an unheated utility-vehicle bed overnight because temperature cycling between service cycles accelerates oil separation from the grease. Long-term storage over 60 days: drain the reservoir and solvent-clean the head before putting the kit away.
Can I use the S-712DP/PRO to pump oil or only grease?
Grease only. The dual-piston pump, the check valve, the coupler, and the hose are all designed for NLGI-graded grease (NLGI 0 through NLGI 3), not for light lubrication oils. Attempting to pump thin oils through a grease-gun pump causes three problems: the oil bypasses the follower-plate seal and migrates back into the reservoir, the non-return valve does not seal reliably against low-viscosity fluids and the gun loses prime between strokes, and the hose and coupler are not rated for the different back-pressure characteristics of hydraulic oil. For oil lubrication, use dedicated oil cans or oil-specific transfer equipment from the STAR oiling equipment range. Chassis and bearing grease is what this gun is engineered for.
Why Global Buyers Trust STAR
We at STAR have manufactured lever action grease guns in our ISO 9001:2015 certified workshop since 1980. The S-712DP/PRO ships with full export documentation and multilingual manuals, and is the premium-margin SKU in the dual-piston family for distributors targeting professional fleet service, agricultural dealership trade, and corporate service-kit buyers.