S-710L/PRO Lever Action Grease Gun

Frequently Asked Questions: Lever Action Grease Gun

What is the advantage of a 900 cc high capacity grease gun over a standard 500 cc?

900 cc capacity reduces reload frequency by nearly half compared with 500 cc, which matters when service routes cover multiple machines per shift. At 20 grams per typical fitting, 500 cc services 25 fittings per fill, 900 cc services 40-45. For agricultural contractors and fleet depots running multi-machine service rounds, the S-710L/PRO covers one full tractor plus implements per fill, or 2-3 lighter vehicles. Over a service shift this saves 4-6 reloads and 10-20 minutes of reload time per operator. The Pro tier adds a rubber sleeve for grip security, premium accessory kit (rigid extension, flexible hose, pointed connector) and tighter quality control verification. The underlying 900 cc wide-barrel Quadra-Cut steel head platform is shared with the base S-710L.

Is a high capacity grease gun better for fieldwork and large machinery?

Yes. The S-710L/PRO's 900 cc capacity and 12,000 PSI output match the requirements of field service on large agricultural and industrial machinery across Australia, New Zealand and Pacific islands. Typical field applications: full-fitting tractor service (20-30 points per machine), combine harvester header and threshing drives, broadacre implement maintenance, mining contractor haul-truck chassis (45+ points), port-yard handling equipment. The rubber sleeve added on the Pro tier matters more in field conditions than workshop settings because the gun gets handled with gloved or grease-covered hands. Slip-resistant grip prevents drops that could crack the head. For coastal and humid Pacific-island service, corrosion resistance is better on the aluminium-head S-710DC equivalent.

What PSI output should a heavy duty grease gun deliver?

12,000 PSI (830 bar) is the premium-tier pressure for heavy-duty lever grease guns and the S-710L/PRO delivers it. Comparison points: 6,000 PSI handles standard automotive and agricultural service; 10,000 PSI clears crusted zerks on heavy equipment left outdoors; 12,000 PSI provides margin for mining, large-construction and extended-field-service applications where fittings develop heavy contamination. For Australian and NZ rural and industrial service the 12,000 PSI rating removes "skipped fittings" as a failure mode . Every fitting the operator encounters can be cleared regardless of condition. The Pro tier does not change the PSI rating. It shares the base S-710L's Quadra-Cut Precision head construction that develops 12,000 PSI.

How do you load a 900 cc high capacity lever grease gun?

Load the S-710L/PRO from either a 450 g cartridge or bulk pail in six steps for cartridge fill, seven steps for bulk fill. Cartridge. Retract and lock the plunger rod. Next, unscrew the wide barrel. Then, peel the metal pull-tab off the cartridge nose. After that, insert nose-first into the barrel (900 cc reservoir has space above the 450 g cartridge for supplementary bulk topping if needed). From there, peel the plastic seal off the bottom and screw the head back on. Finally, release the plunger rod. Bulk: (1-2) same. Then, dip the barrel into a grease pail and pack firmly (900 cc packing takes about 50 percent more time than 500 cc). After that, screw the head on. From there, release the plunger. Finally, crack the head a quarter turn. And last, pump 6-10 strokes to bleed air, retighten.

How do you prime a high capacity grease gun for first use?

Prime the S-710L/PRO in four steps after every reload. Ensure the head is screwed snug against the wide barrel. Next, crack the head a quarter turn to open the bleed path. Then, with the coupler disconnected, pump the lever through 6-10 full strokes to purge air from the 900 cc reservoir. After that, retighten the head once grease flows from the head seam without air bubbles. The 900 cc wide-barrel reservoir needs more priming strokes than standard 500 cc guns because the larger volume traps more air during bulk-fill packing. For first use from factory, add two extra priming cycles. Factory-fill test grease must be fully purged before live service. Never prime against a connected fitting. Air must escape at the head, not into a bearing.

What causes air lock in a high capacity grease gun?

Air lock on the S-710L/PRO has three common causes. Incomplete bulk-fill packing leaving voids in the 900 cc reservoir. Next, swapping cartridges mid-partial-fill so air fills the space above the new cartridge. Then, leaving the plunger rod retracted-and-locked so the follower spring is disengaged and grease settles away from the head. The Pro tier's rubber sleeve does not affect air-lock tendency. It is a handling feature, not a hydraulic feature. Prevention: pack bulk grease firmly with a scoop avoiding the sides of the barrel where voids form, never swap cartridges until the previous one is fully consumed, release the plunger rod from the side-slot lock whenever the gun sits for more than a few minutes. Cure: bleed air per the priming procedure.

Why does my grease gun stop pumping after loading?

Loss of pumping after loading is almost always air lock . Grease has no compressibility so when the follower spring tries to force grease through the non-return valve, trapped air compresses instead of grease moving forward. Cure: retract the plunger rod fully and lock it into the side slot, crack the head a quarter turn to open the bleed path, release the plunger rod so the follower spring compresses the grease column, pump the lever 6-10 strokes until grease flows from the head seam without bubbles, retighten the head. If air lock persists after three bleed cycles, inspect for incomplete bulk packing (partial voids in the 900 cc reservoir) or a worn plunger seal allowing air bypass around the follower. Deep clean the gun after 12-18 months of daily service.

How does a high volume lever grease gun deliver 1 oz per 7 strokes?

The S-710L/PRO delivers approximately 1 gram per stroke, or 1 ounce per 28 full-lever strokes. Standard high-volume lever guns deliver higher volume per stroke (1 oz per 7 strokes on some designs) but at correspondingly lower peak pressure. On the S-710L/PRO the 40:1 pressure ratio trades volume for pressure. Each stroke develops 12,000 PSI at the coupler but delivers only 1 gram of grease volume. For high-volume sealed-bearing applications where per-fitting grease quantity matters more than pressure, low-pressure high-volume designs can be preferable. For heavy-duty fitting clearing where pressure matters more than volume, the S-710L/PRO's high-pressure architecture is the match. Most professional service uses the high-pressure architecture because fitting contamination is the primary service challenge.

How does variable stroke work on a high capacity grease gun?

Variable stroke allows full pressure development on partial lever swings. The S-710L/PRO is a fixed-stroke gun because high-pressure wide-barrel platform design requires full piston travel for pressure development. Variable-stroke capability is available on sibling products like the S-710DC (aluminium head, 650 cc). For access-constrained work requiring tight-clearance fittings where a full lever swing is blocked, the variable-stroke S-710DC is the pick. For normal field and workshop service where lever swing clearance is not a limiting factor, the fixed-stroke S-710L/PRO platform delivers more positive lever feel and predictable stroke-count planning. The Pro tier shares the fixed-stroke platform with the base S-710L.

Can mixing grease types cause clogging in a grease gun?

Yes, mixing grease chemistries causes thickener separation and can form slurry that clogs the non-return valve, fouls the internal passages of the Quadra-Cut head and damages downstream bearing seals. Lithium complex, calcium sulphonate, aluminium complex and polyurea thickeners all use different chemistry. Combining them creates incompatibility reactions. To change grease types in the S-710L/PRO: empty the 900 cc reservoir completely, unscrew the head, wipe the wide-barrel interior with solvent-dampened lint-free rag, solvent-clean the head internals and non-return valve, reassemble with the new grease and prime per the procedure. Best practice for fleet operations: dedicate one S-710L/PRO per grease chemistry and label each gun with chemistry and NLGI grade on visible tape.

How do you keep a high capacity grease gun from leaking?

Leak prevention on the S-710L/PRO depends on three maintenance points. Full head tightening after each reload. Next, periodic plunger seal inspection. Then, flex-hose replacement cycle. The rolled-thread barrel makes full tightening easy but operators rushing reloads can leave the head half-seated. Always feel the seal compress before declaring the head tight. The nitrile plunger seal rides against the barrel wall and wears over 12-18 months of daily service. Inspect for circumferential scoring every clean cycle and replace from the STAR spare-parts kit when worn. The flex hose flexes and retracts thousands of times per year. Replace every 2-3 years in continuous outdoor service or earlier if cracks, bulges or stiffness appear.

How does a 900 cc grease gun reduce downtime in the field?

Fewer reloads per service route means less non-productive time per operator. A typical fleet-service round covering 4 vehicles at 15-25 fittings each needs 1-3 reload cycles with a 500 cc gun (roughly 2-6 minutes of reload time total). The same route runs 0-1 reload cycles with the S-710L/PRO at 900 cc. Over a 5-day service week a crew of 3 operators saves 30-90 minutes of reload time. The rubber-sleeve grip on the Pro tier adds field-handling security. Operators wearing gloves in dusty Outback conditions, humid NZ coastal service or cold sub-alpine shifts maintain secure grip where bare metal guns slip. These are marginal time savings per fitting but compound significantly over a full service season.

How should you store a 900 cc lever grease gun?

Store the S-710L/PRO horizontally with the plunger rod disengaged for any period over a week with grease loaded. Oil bleed (base oil separating from grease thickener) happens faster in partially-loaded wide-barrel reservoirs because the larger diameter exposes more grease surface area to gravity-driven separation. Horizontal storage minimizes settling. Releasing the plunger rod lets the follower spring keep the grease column compressed against the head. For storage over 30 days: drain the 900 cc reservoir completely, wipe the barrel interior with solvent, reassemble with the plunger seal lightly greased, store dry at 10-30°C away from direct sun. Australian Outback and Pacific-island operators should not leave the gun in open utility-vehicle beds overnight.

What safety precautions should you take when using a 10,000 PSI high capacity grease gun?

The S-710L/PRO develops 12,000 PSI (above the 10,000 PSI tier) so safety precautions are stricter than for 10,000 PSI guns. Mandatory PPE: wraparound safety glasses, nitrile chemical-resistant gloves, closed-toe steel-capped boots, long-sleeve protective clothing. Safety rules: never point the coupler or flex hose at any body part, keep the lever-hand behind the coupler head, inspect the 12" flex hose before each use for cracks or bulges, never test grease flow against skin or fabric. The Pro tier's rubber-sleeve grip adds security against slip-drop injury during pumping but does not change injection-injury risk. At 12,000 PSI, any suspected injection injury is a surgical emergency requiring immediate hospital treatment regardless of initial pain or wound appearance.

What is the amputation risk at pressures above 7,000 PSI?

Above 7,000 PSI the risk of grease injection injury progressing to tissue necrosis and amputation rises significantly. The S-710L/PRO at 12,000 PSI is well above that threshold. Medical literature reports amputation rates of 30-50 percent for untreated grease injection injuries delayed beyond 6-12 hours. The mechanism: injected grease under skin spreads along tissue planes and blood vessels, causing chemical irritation, foreign-body reaction and secondary infection. Treated promptly (surgical debridement within hours), outcomes improve substantially but often require multiple surgeries. Any suspected injection injury on the S-710L/PRO requires immediate emergency-department presentation. The initial puncture wound typically looks minor while the underlying tissue damage is severe. This is why 10,000+ PSI lever guns always warrant PPE compliance.

Why is a steel head better than aluminum for a high capacity grease gun?

Drop-resistant forged steel survives mechanical shock that cracks aluminium die cast heads. The S-710L/PRO's Quadra-Cut Precision steel head is engineered for drop-heavy service environments. On a 900 cc high-capacity gun the head carries the reservoir weight plus pressure loading. Aluminium is susceptible to fatigue cracking under prolonged high-cycle pumping plus impact loading. Steel absorbs both without cracking. For drop-heavy construction yards, mining contractor utes, agricultural paddock service and Pacific-island field maintenance where tools get handled roughly, the steel head is the impact-margin that prevents catastrophic gun failure. For humid coastal and marine applications where aluminium corrosion resistance matters more than drop tolerance, the aluminium-head S-710DC is the alternative. Pick by environmental risk dominance.

What maintenance does a high capacity grease gun need?

The S-710L/PRO needs three routine maintenance activities. Deep cleaning every 60 days for fleet-service use or every 6 months for workshop use. Next, plunger seal replacement every 12-18 months of daily service. Then, flex hose replacement every 2-3 years in continuous outdoor service. Deep clean procedure: depressurize, empty the 900 cc reservoir, unscrew the head, wipe the wide-barrel interior with solvent-dampened rag, solvent-clean the Quadra-Cut head internals and non-return valve, inspect the plunger seal and flex hose. Reassemble with fresh grease lightly applied to seals. The rubber sleeve on the Pro tier requires no specific maintenance but check occasionally for tearing in harsh-chemical environments where solvents may contact the sleeve.