It's great for hobbyists and anyone who needs portable AC stick welding and AC generator power! Dependability and long life aided by all-copper windings in rotor and stator with high quality insulation. Red and black powder paint finish offers increased durability with added protection from rust and corrosion. Also ultraviolet resistant to better retain color and gloss. Manufactured under a quality system certified to ISO 9001 requirements and meets U.S. EPA EVAP standards for reduced emissions of gasoline vapor.
The Bulldog 5500 is designed with portability and durability as core features, incorporating innovative Low-Lift Grab Bars (Patent Pending) that make transportation easier, along with a rugged 1-1/4 in. (32 mm) diameter tube frame that provides excellent protection for the engine and components. This versatile machine delivers reliable AC welding performance with the capability to handle up to 1/8 in. (3.2 mm) stick electrodes, making it ideal for basic repair and fabrication tasks. The all-copper windings in both the rotor and stator, protected by high-quality insulation, ensure dependable operation and extended service life in various working environments.
As a dual-purpose unit, the Bulldog 5500 offers impressive generator capabilities with 5,500 watts of surge power and 4,000 watts of continuous AC generator power, providing sufficient output to run power tools, lights, and other electrical equipment on remote job sites or during emergency situations. The quality construction is evident in details like the durable red and black powder paint finish that provides enhanced protection against rust and corrosion while maintaining its appearance through resistance to ultraviolet degradation. Manufactured to meet ISO 9001 quality standards and U.S. EPA EVAP requirements for reduced gasoline vapor emissions, the Bulldog 5500 represents an excellent value proposition for hobbyists, maintenance personnel, farmers, and others requiring a reliable, portable source of both welding capability and generator power.
- Low-Lift Grab Bars (Patent Pending)
- 1-1/4 in. (32 mm) Diameter Rugged Tube Frame
- AC Welding with up to 1/8 in. (3.2 mm) Stick Electrode
- 5,500 Watts Surge (4,000 Watts Continuous) AC Generator Power
| Dimensions (H x W x D) | 25.6 in x 21.8 in x 31.5 in (651 mm x 553 mm x 800 mm) |
| Net Weight | 198 lbs (89.813 kg) |
| Machines Processes | Stick (SMAW) |
| Output Range by Mode | CC-Stick: 70 – 140 Amps |
| Single Phase Auxiliary Output | 4,000 Watts Continuous, 120/240V |
| Auxiliary Output Frequency | 60 Hz |
| Receptacle Types | NEMA 5-20R |
| Engine Brand & Model | Kohler CH395 |
| Engine Description | 1 Cylinder Air Cooled Gasoline Engine |
| Engine Horsepower | 8.9 HP |
| High Idle Operating Speed @ Rated Output | 3600 |
| Fuel Tank Size (US gal.) | 1.9 |
| Fuel Tank Size (L) | 7.2 |
| Oil Capacity (qts.) | 1.2 |
| Oil Capacity (L) | 1.1 |
| Typical Application | General Fabrication Maintenance & Repair Repair Welding |
| Warranty | 3 Years Parts and Labor - Engine warranted separately by engine manufacturer |
Lincoln lists the welding processes for the Bulldog 5500 as: Stick. Lincoln’s spec sheet states “Processes: Stick” and nothing else. It is an AC-output stick machine rated 125 A AC maximum, taking electrodes up to 1/8 in. Lincoln does not list TIG on this machine. Source: Lincoln spec sheet E6.32.
Yes. Lincoln publishes the auxiliary AC generator output for the Bulldog 5500 as: 5,500 Watts Surge / 4,000 Watts Continuous, 60 Hz, 120V/240V AC Single Phase, 100% Duty Cycle. The 240 V outlet on this machine is a two-pole 240 V-only NEMA 6-20R receptacle — not a 120/240 V full-KVA NEMA 14-50R. Lincoln publishes these receptacles for this machine:
- 120V Duplex Receptacles — 120V, 20 Amps Each, 33.3 Amps Total, NEMA 5-20R
- 240V Receptacle — 240V, 16.7 Amps, NEMA 6-20R
Source: Lincoln spec sheet E6.32.
The Bulldog 5500 on this listing is powered by a Kohler CH395 gasoline engine, 8.9 HP. Kohler engines in this line are gasoline or LP-Gas — there is no Kohler diesel in the Lincoln engine-drive range. Lincoln’s current engine-warranty document brands Kohler as Rehlko (formerly Kohler). Source: Lincoln spec sheet E6.32.
Duty cycle varies by output setting, and this machine is not a continuous-duty welder. Lincoln rates the Bulldog 5500 at 125 A AC / 20 V / 30% duty cycle and 100 A AC / 25 V / 60% duty cycle over a 70–140 A AC range; the only 100% duty cycle figure on the spec sheet belongs to the AC generator, not the welding output. Rated at 104ºF (40ºC).
| Welding process / output mode | Rating basis | Amperes | Volts | Duty cycle | As printed by Lincoln |
|---|---|---|---|---|---|
| AC Constant Current | NOT LABELLED (CC Rated Output column) | 125A AC | 20V | 30% | 125A AC/20V/30% |
| AC Constant Current | NOT LABELLED (CC Rated Output column) | 100A AC | 25V | 60% | 100A AC/25V/60% |
| Mode / parameter | Range |
|---|---|
| Current Range | 70-140 A |
| Output Range (Product Specifications) | 70-140A AC |
| Open circuit voltage | Max. OCV@ 3750 RPM 66V RMS |
| Rated ambient temperature | "Welding and AC Generator Outputs Rated at 104ºF (40ºC)." |
| Specification | As printed by Lincoln |
|---|---|
| Peak / surge output | 5,500 Watts Surge |
| Continuous output | 4,000 Watts Continuous |
| Single-phase | 5,500 Watts Surge / 4,000 Watts Continuous, 60 Hz, 120V/240V AC Single Phase, 100% Duty Cycle |
| Three-phase | NONE PRESENT (single-phase machine) |
| Frequency / phase | 60 Hz, 120V/240V AC Single Phase |
| Generator duty cycle | 100% Duty Cycle (AC generator) |
| Receptacle | Voltage | Amperage | NEMA type |
|---|---|---|---|
| 120V Duplex Receptacles | 120V | 20 Amps Each, 33.3 Amps Total | NEMA 5-20R |
| 240V Receptacle | 240V | 16.7 Amps | NEMA 6-20R |
Source: Lincoln Electric publication E6.32 (Issue Date 02/11) — view the Lincoln spec sheet PDF. Figures are Lincoln's own; “NOT STATED” means Lincoln does not publish that value for this machine.
Yes — this is a factory demo or low-hour unit directly from Lincoln Electric. Units may show light cosmetic marks from display use but are mechanically sound. The warranty on this unit is the same as on a new machine. Lincoln’s Industrial Limited Warranty (form IMWS1, Apr-2026) lists a 3-year warranty period for “All Lincoln welding machines, wirefeeders & plasma cutting machines”, and Lincoln states: “Lincoln will assume both the parts and labor expense of correcting defects during the warranty period.” As on a new machine, the engine is not covered by Lincoln’s warranty — Lincoln states: “All engines and engine accessories are warranted by the engine or engine accessory manufacturer and are not covered by this warranty.” This machine’s Kohler CH395 engine is warranted by Rehlko (formerly Kohler): “Three Years”, and that term “BEGINS ON DATE OF PURCHASE BY END USER.” Lincoln footnotes the Rehlko (formerly Kohler) three-year term “First owner only.” Lincoln directs buyers to the engine maker — WWW.ENGINES.REHLKO.COM / 1-800-544-2444 Rehlko Service Department. See Lincoln Engine Drive Motors Warranty Contacts. Source: Lincoln Electric Industrial Limited Warranty (form IMWS1, Apr-2026).
Lincoln’s own included-items list for K2708-2 is: (1) Bulldog 5550 Engine Drive Welder (Lincoln K2708-2). (Lincoln’s own page prints “5550”; the product is the Bulldog 5500.) This factory demo unit is supplied the same way. Not included: welding leads (electrode and work cable), electrode holder, work clamp, and accessory kits. No printed operator’s manual, WeldingMart demo-prep certification document or Lincoln warranty registration paperwork ships with the machine. Consumables (electrodes, gas cylinders) are not included. Leads, holders, clamps, cable connectors, undercarriages, spark arrestors, remote controls and wire feeders are sold separately — contact WeldingMart and we will quote the exact set you need.