S-808 Dual Mode Grease Gun

Frequently Asked Questions: S-808 Dual Mode Grease Gun (Pistol + Lever, Telescopic Handle)

What is the S-808 Dual Mode Grease Gun and how does it combine pistol and lever operation?

The S-808 is a single grease gun that operates in both pistol-grip trigger mode and lever-action pumping mode, selected by the position of a telescopic handle. Push the handle in for pistol mode (one-hand trigger, 4,500 PSI, 1.1 g per stroke); pull the handle out for lever mode (two-hand pump, 7,000 PSI, 0.65 g per stroke). The conversion is instant and mechanical; no mode switch, no button, no disassembly. The S-808 replaces two separate grease guns in one tool for workshops whose service workflow spans both tight-access one-hand greasing and high-pressure two-hand service.

How does the telescopic handle work to switch between pistol and lever mode?

The telescopic handle slides in and out of the gun body via a spring-loaded button lock. In the retracted position, the handle is compact and the trigger mechanism engages for pistol-grip operation. In the extended position, the handle reaches lever length and the lever mechanism engages for two-hand pumping. To switch modes: (1) lift the button to unlock, (2) slide the handle to the desired position, (3) press the button to lock back in position. The handle locks positively in both positions so it cannot collapse under lever-mode pumping force or extend during pistol-mode trigger squeezes. To switch: disconnect the coupler from the fitting, perform the lift-slide-press sequence, reconnect and continue. The conversion takes under two seconds.

What pressure and output does each mode deliver?

Pistol mode delivers 4,500 PSI (310 bar) at 1.1 g per stroke (1 oz. per 26 strokes). Lever mode delivers 7,000 PSI (483 bar) at 0.65 g per stroke (1 oz. per 44 strokes). The pressure difference reflects the mechanical advantage: lever mode concentrates more force per stroke on building pressure (fewer grams per stroke but higher PSI), while pistol mode distributes force across more grease volume per stroke (more grams per stroke at lower PSI). Lever mode in the extended position also delivers 5,500 PSI (380 bar) in high-volume configuration. The operator picks the mode based on the fitting's resistance: clean fittings accept grease readily at 4,500 PSI pistol; stiff or crusted fittings need 7,000 PSI lever.

When should I use pistol mode vs lever mode?

Use pistol mode for tight-access fittings where one-hand operation is the practical requirement: under vehicles, inside engine bays, trailer bearings where one hand holds the cap, confined spaces, and any fitting where lever clearance is restricted. Use lever mode for stubborn fittings where 4,500 PSI pistol pressure is insufficient: crusted chassis zerks, excavator pins after storage, farm tractor fittings that have not been serviced in months, and any fitting where the pistol trigger "bottoms out" without grease flowing. Most mixed-workflow service routes use pistol mode for 70-80% of fittings and switch to lever mode for the 20-30% that resist.

Can the S-808 replace two separate grease guns (one pistol, one lever)?

Yes, that is the primary design purpose. The S-808 covers both the pistol-grip one-hand service scenario and the lever-action high-pressure scenario in a single tool. For workshops that cannot justify owning both a dedicated pistol gun and a dedicated lever gun, the S-808 is the single-tool answer. The trade-off: the S-808's pistol mode at 4,500 PSI is slightly lower than dedicated pistol guns at 5,000-8,000 PSI, and the lever mode at 7,000 PSI is lower than dedicated lever guns at 10,000-12,000 PSI. For most mixed-workflow service, both pressure tiers are adequate; for severely crusted fittings that need 10,000+ PSI, a dedicated lever gun is still the step-up pick.

Can 7,000 PSI in lever mode damage bearing seals?

Only if the operator continues pumping after the bearing cavity is full. Bearing seals typically fail at internal grease-cavity pressures of 500 to 1,500 PSI; the 7,000 PSI figure is the maximum pump pressure when the coupler outlet is fully blocked, not the steady-state pressure reaching the bearing. Actual pressure at the bearing depends on the fitting's flow restriction: a clean zerk passes grease at low pressure, the pump never reaches peak PSI unless the path is completely blocked. To prevent seal damage: stop pumping the moment fresh grease appears at the bearing seal or the lever resistance sharply increases.

Can the S-808 cause a grease injection injury?

Yes. Lever mode at 7,000 PSI is above the threshold where injection-injury amputation risk escalates significantly if treatment is delayed. A pinhole in the hose or unseated coupler can drive grease through intact skin. The initial wound looks like a tiny puncture; grease migrates along tissue planes and causes chemical damage over 24-72 hours. Go to an emergency department immediately for any suspected injection injury. Pistol mode at 4,500 PSI also carries injection-injury risk. Follow standard PPE: wraparound safety glasses (ANSI Z87.1+), nitrile gloves, long sleeves, closed-toe shoes. Never point the coupler at any body part.

How do I prime the S-808 after a cartridge change?

Load the cartridge, release the plunger rod, crack the air bleeder valve a quarter turn, and pump 3-5 strokes with the coupler disconnected until grease flows cleanly without air bubbles. Close the bleeder. Prime in whichever mode is currently selected; the pump chamber fills the same way regardless of handle position. If priming fails after 5 strokes: check the plunger rod is fully released, inspect the cartridge seating for air voids, and in cold weather allow the grease 5-10 minutes to warm to ambient. First-use priming on a new gun may take 5-8 strokes.

Is the telescopic handle durable for daily professional use?

Yes. The telescopic mechanism uses steel components with positive-lock detents rated for daily professional use across the service life of the gun. The most common wear point is the detent spring that holds the handle in position; this is a replaceable component available through the STAR spare parts catalogue. Good practice: keep the telescopic mechanism clean (wipe with a dry rag after each use), avoid forcing the handle if it feels stiff (investigate for grease contamination in the slide channel), and store with the handle in the retracted (pistol) position to minimise the exposed slide surface area during storage.

Does the S-808 accept standard 14 oz. (400 g) cartridges?

Yes. The 57.15 mm barrel accepts standard 14 oz. (400 g) DIN 1284 Euro-Cartridge grease cartridges from any major grease supplier, the same cartridges used across the full STAR lever-action and pistol-action range. Full 4-way loading: cartridge, bulk pack from pails, suction fill from open containers, and filler pump fill from shared depot reservoirs. For the 450 g Australian/NZ cartridge standard, the S-808W wide-barrel variant is the correct pick.

How should I store the S-808 between service cycles?

Store horizontally with the telescopic handle retracted (pistol position), plunger rod disengaged from the lock, coupler capped, in a clean dry area. Retracted storage minimises the exposed telescopic slide surface and reduces dust ingress into the slide channel. For storage over 30 days: empty the barrel, wipe the interior with mineral spirits, dry completely, lightly grease the plunger-rod seal, and reassemble. The powder-coated body resists corrosion during storage but benefits from dry conditions.

What grease types are compatible with the S-808?

NLGI 1, 2, and 3 greases across all standard chemistries: lithium complex, calcium sulphonate, aluminium complex, polyurea, moly-fortified EP (extreme pressure), and synthetic PAO-based. For general automotive and agricultural service, NLGI 2 lithium complex or EP-2 is standard. For cold weather (below 0 degrees C), NLGI 1 flows more easily. Never mix incompatible thickener chemistries in the same gun; maintain separate dedicated guns per chemistry for mixed-fleet workshops, or flush thoroughly with mineral spirits between chemistry changes.

Is the S-808 available for OEM and private-label orders?

Yes. OEM and private-label manufacture is available on the S-808 for global industrial-supply distributors, automotive aftermarket trade, and professional-tool wholesale. Options include custom branding, packaging design, BSPT/NPT/M10x1 thread variants, carrying case options, and custom kit configurations. The dual-mode "best of both worlds" positioning commands margins above single-mode alternatives. Contact the STAR export team for distributor pricing, lead times, and packaging specifications.

How does the S-808 compare to a cordless electric grease gun?

Cordless electric grease guns deliver consistent pressure without manual pumping effort, reducing operator fatigue on high-volume routes. The S-808 is the manual alternative: no battery to charge, no motor to maintain, works in any temperature and environment without electrical dependency. Pick cordless for high-volume daily routes where operator fatigue is the primary constraint. Pick the S-808 for versatility (two modes in one tool), simplicity (no electronics), and environments where battery tools are impractical (wet, cold, remote field service, explosive atmospheres). The S-808 also costs significantly less than cordless alternatives and has no battery-replacement lifecycle cost.