Tronair 02-7834C0111 – 12-Ton Axle Jack

The Tronair 02-7834C0111 is a 12-ton hydraulic axle jack specifically engineered for use on Bombardier Learjet 45, 70, and 75 aircraft. Because aircraft axle jacks must precisely match the landing gear geometry and load requirements of specific airframes, using this jack on aircraft models outside its approved application is not recommended. Always verify compatibility with the aircraft's maintenance manual before beginning any jacking operation.

The Tronair 02-7834C0111 has a vertical lifting capacity of 24,000 lbs (10,886 kg), which is equivalent to 12 tons or approximately 10.87 metric tons. This capacity is more than adequate for supporting Learjet landing gear components during tire changes, brake servicing, and other routine maintenance procedures. Operators should never exceed the rated load, and load testing should be performed annually to verify that the jack continues to perform within its rated capacity.

The Tronair 02-7834C0111 axle jack operates using standard MIL-PRF-5606 mineral-based hydraulic fluid. Before each use, technicians should verify that the hydraulic fluid level is between 0.50" and 0.75" from the top of the reservoir fitting, checked with the rams fully collapsed. During routine maintenance, old hydraulic fluid should be flushed from the system and replaced with fresh, clean MIL-PRF-5606 fluid to maintain optimal performance and protect internal components.

The Tronair 02-7834C0111 axle jack has a minimum closed height of 5.88” (14.92 cm) and a maximum obtainable height of 13.13” (33.34 cm). Height is achieved through two mechanisms: a quick-action mechanical extension of 1.57” (3.97 cm) and a three-stage hydraulic extension of 5.75” (14.61 cm). This combination of mechanical and hydraulic extension gives technicians precise control over lift height, accommodating the specific clearance requirements of the Learjet landing gear.

The Tronair 02-7834C0111 comes complete with a main gear pad (R-1820), a nose gear adapter assembly (K-4191), and a carrying case for convenient storage and transport. These accessories are essential to safe operation – the manufacturer explicitly warns that the jack must always be used with either the main gear pad or the nose adapter installed, as damage to the aircraft or loss of the load can occur if either is missing. At just 37 lbs (27.22 kg), the unit is designed to be portable and field-ready.

To raise the Learjet nose gear with the 02-7834C0111, place the jack on a hard, level surface, connect the pump hose, and open the reservoir vent screw before operating. Screw out the mechanical extension, then place the nose gear adapter (Z-3275) over the mechanical extension and align the horizontal slot in the pin with the front axle by adjusting the mechanical extension. Slide the pin into the axle until the pin shoulder rests firmly against the axle, then close the pump release valve and operate the pump to raise the gear. Jacking adapters must be fully seated on the mechanical extension before pressurizing the system, and hands should never be placed between the aircraft and the jack pad during operation.

For main gear operations, place the jack on a hard, level surface, connect the pump hose, open the reservoir vent screw, and install the main gear pad (R-1820) over the mechanical extension. Adjust the mechanical extension so the pad sits approximately 1/4 "(0.25"/0.63 cm) below the bottom of the jack pad on the aircraft, then position the jack between the tires and verify approximately 1/4" clearance between the mechanical extension and the bottom of the jack pad. Once properly positioned, close the pump release valve and slowly pump the jack to raise the aircraft wheel, confirming adequate clearance between the jack cylinder assembly and the brake casting throughout the lift.

Routine maintenance of the Tronair 02-7834C0111 includes checking all nuts, bolts, and screws for tightness, verifying hydraulic fluid levels before each use, and replacing all O-rings and backup rings whenever the jack is disassembled. The work area should be kept clean and free of dirt during any maintenance or repair, and special care must be taken to avoid contact between tools and the critical sealing surfaces of internal components, as surface deformities can cause seal degradation and fluid leakage. A formal jack function load test – applying a test load equal to the jack's rated capacity plus 10 percent – must be performed annually to confirm the unit is operating safely within its design parameters.

Tronair warrants the 02-7834C0111 to be free of manufacturing and material defects for one year from the date of shipment to the original customer, covering repair or replacement of defective components. This warranty does not cover parts required for normal maintenance or replacement parts, which carry a separate 90-day warranty from the date of shipment. Any unauthorized modification of the jack, or use that violates the cautions and warnings in the operation and service manual, will immediately void all warranty coverage – making it critical that only Tronair OEM replacement parts are used and that all maintenance is performed by a skilled and trained technician in accordance with the manufacturer's documented procedures.