ESCO 91004 MAMMUT Jack, Air/Hydraulic, Single Stage (100 Ton)

The ESCO 91004 MAMMUT Jack has a lifting capacity of 100 tons (110 US tons), making it suitable for heavy earthmoving equipment, construction machinery, and industrial lifting applications. This single-stage capacity is achieved through air/hydraulic operation at 145-174 psi pressure, with a large single piston that provides consistent lifting force across the 17.5-inch stroke range.

The ESCO 91004 MAMMUT Jack requires a level, stable work surface with adequate ground clearance. Maximum operating height reaches 46 inches (1,170 mm), with minimum height when fully lowered at 28.5 inches (725 mm), providing a 17.5-inch (445 mm) stroke range. Overall dimensions are 69.2 inches long, 24.4 inches wide, and 49.3 inches deep at the base. Wide pneumatic tires help stabilize the unit on uneven surfaces typical of construction and quarry sites.

The ESCO 91004 MAMMUT Jack operates optimally at 145-174 psi (10-12 bar) with air consumption of 600 nl/min. The jack must be connected to a clean, dry compressed air source with appropriate filtration to protect the brass air motor. Never exceed the recommended pressure range, as this can damage internal seals and reduce jack service life. A dedicated compressor with minimum output capacity of 600 nl/min is recommended.

The dual descent valve is ESCO's engineering feature that provides precise control when lowering heavy equipment under load. Unlike standard single-descent systems, the dual valve prevents uncontrolled descent and allows operators to make micro-adjustments during maintenance work. This is especially critical when working on suspended equipment where unexpected load shifts could cause serious injury or property damage. Always verify descent valve operation before each use.

The ESCO 91004 MAMMUT Jack is designed for mobile, job-site operation and does not require permanent installation in most cases. However, proper site preparation is essential: ensure level work surfaces, appropriate ground stability for load-bearing, secure air supply connection with quality hose and fittings, and remote control cable routing for safe operator positioning. Many shops choose to have an equipment technician verify air system integration and operational setup to maximize safety and lifespan.

The ESCO 91004 MAMMUT Jack arrives with the main unit, standard remote control for safe lifting and lowering from a distance, folding handle for transport, special transport hook for attachment, and all internal components including brass air motor, high-grade graphite seals, O-rings, and U-cups. Optional accessories including extension holders, height extensions (7.9" to 11.875"), tilting plates, and safety block sets are sold separately to customize the jack for specific equipment contact points.

Regular maintenance is essential for reliable long-term operation. Inspect the brass air motor monthly for debris and clean as needed. Check all seals, O-rings, and U-cups for signs of leakage or wear and replace if needed. Drain air hose and supply line regularly to remove moisture that can damage seals. Clean the jack after use in dusty or corrosive environments. Store in a dry location when not in use. Always keep the dual descent valve moving freely by operating it through full range cycles before heavy lifting work.

While the ESCO 91004 has sufficient capacity (100 tons), it is specifically designed and marketed for heavy industrial equipment, earthmoving machinery, and construction equipment maintenance. For vehicle lifting, lighter-duty automotive jacks with appropriate load ratings and saddle designs are more suitable. The MAMMUT is optimized for mining, quarry, agricultural, and trucking fleet equipment service where 100-ton capacity, dual descent control, and industrial durability are required.

ESCO offers MAMMUT jacks in multiple capacities and stage configurations: the 91000 is a 3-stage (25/50/80 ton), 91001 is a 2-stage (30/60 ton), 91003 is a 2-stage (50/80 ton), and the 91004 is a single-stage 100-ton model. The 91004 provides maximum lifting capacity in a single-stage design, ideal when full 100-ton lift is consistently needed. Multi-stage models offer flexibility for varying load heights but require more operational complexity. Choose based on your typical equipment size and lifting needs.

The ESCO 91004 weighs 626 lb (284 kg), which is manageable for a two-person team using the included folding handle to secure it for transport. Large, wide pneumatic tires designed for extreme conditions allow the jack to be wheeled across construction sites, quarries, and mining areas. For longer distances or frequent relocation between job sites, the unit can be loaded onto a truck or trailer using a forklift or loading equipment. The compact footprint (69" x 24" x 49") fits in standard vehicle beds when properly secured.

The ESCO 91004 MAMMUT Jack is backed by a 3-year Limited Warranty covering defects in materials and workmanship. The warranty is only valid if the warranty card is registered on file with ESCO at www.esco.net/warranty within a specific timeframe. Coverage includes the hydraulic cylinders, brass air motor, seals, O-rings, and structural components. This warranty is limited to the original first-use purchaser and excludes damage from misuse, overloading, improper maintenance, or unauthorized modifications.

Yes, ESCO offers a full range of MAMMUT 91004 accessories to customize the jack for different equipment: extension holders (right 91035 and left 91034) secure extensions in place, height extensions come in 7.9" (91029), 9.875" (91030), and 11.875" (91031) lengths, a 3-inch tilting plate (91049) adjusts contact angle, and a complete safety block set (91036) includes five safety blocks and holder for load support. These accessories allow you to precisely position the jack's lift point for safe, efficient equipment maintenance across different machinery types.