Terex Tower Crane Transfer Masts Open New Markets for Maxim Crane


Terex’s four new Transfer Masts—HD23-TS212, HD23-TS23, TS23-H20 and TS23-TS21—connect two tower crane systems from Terex and Terex Peiner and Terex Comedil legacy brands to form a versatile and productive tower crane system. They permit a wide range of combinations using varying tower sections to match application requirements and improve freestanding capabilities without the need for anchoring collars.

Positioned between two different towers or directly on the lower slewing unit, Terex Transfer Masts allows crane companies to combine Terex flat top, luffing jib and hammerhead tower segments to increase freestanding capabilities, lower inventory requirements and improve flexibility.

“The luffing jib and flat top cranes are Terex Comedil legacy brand designs, while the Hammerhead crane line originated from our Terex Peiner legacy brand,” says Matthew Dobbs, director of sales for Terex Cranes. The tower segments were not originally designed to be compatible with each other. “Bringing the two designs together in order that any Terex crane could be used with any tower section was one of the final connections we had to make, so these designs would be true Terex tower cranes.”

Maxim Crane Works, L.P., Bridgeville, Pa., is the first customer to purchase the transfer masts. The company’s tower division operates 100 Terex tower cranes. The majority are hammerhead cranes, covering the 300 to 400 meter-ton range markets. Maxim Crane has nearly 1,000 tower sections for its 300 to 400 meter-ton class hammerhead cranes and 150 segments for its 500-ton designs. The company also made a significant investment in 80 tower sections to cover its 4 luffing jib and flat top cranes for use in high rise applications.

Matt Hyden, tower operations manager for Maxim Crane, said the company had excessive inventory for a small number of luffing jib and flat top cranes and frequently waited for a job that required maximum free standing height. However, the company’s recent purchase of two new Terex SK575-32 hammerhead tower cranes enabled Maxim Crane to use both the transfer masts and unused heavy duty tower segments.

“We had 40 unused luffing jib tower segments,” says Hyden. “Purchasing the transfer masts allowed us to use those towers with the new cranes, so we could more efficiently use our inventory and save money on the crane purchase price.”

The new hammerhead cranes were used on a hospital construction project in Cincinnati, Ohio. The 550,000-square-foot Mercy West Hospital expansion covers 60 acres of land. Standard maximum freestanding height for the Terex SK575-32 with Cincinnati’s 45 mph in-service and 94 mph out-of-service wind load ratings is 214 feet under hook—ample height for the 200-foot crane requirement at Mercy West for the general lift, concrete bucket, precast concrete and rebar lifting requirements.

In addition, the ability to incorporate the robust tower sections of the luffing jib and flat top crane designs enables Maxim Crane to reach higher with its hammerhead cranes. “We can get an additional 80 feet to sometimes 100 feet of freestanding height by mixing tower sections with the transfer masts,” says Hyden.

The masts also give Maxim Crane an advantage in coastal states like Florida, where wind-load requirements are much more stringent. Crews are helping to construct a six-story parking garage with three Terex hammerhead cranes equipped with the transfer masts in Coral Gables, Fla. With the state’s 146 mph wind-load standards, maximum standard freestanding height for the crane is 100 feet. By incorporating the transfer masts so that the heavy duty HD23-26.6 tower sections can be used at the tower base with transitions made to the hammerhead’s conventional TS213.1 and TS212.1 towers, crane maximum freestanding height is extended to 140 feet.

This additional capacity is critical on applications like the parking structure, where the cranes overlap, Hyden said. The ramp’s 80-foot height requires a crane with a minimum 100-foot under-hook height. The other two cranes have to be set to a freestanding height higher than the first to accommodate for the overlap. Maximum crane height on the job totals 140 feet, allowing all three cranes to free stand.

“Before, we had to pass on these types of jobs, since we could only reach 100 feet freestanding height in Florida with our hammerhead cranes,” says Hyden. “By gaining the extra height with the transfer masts and heavy duty tower sections, this has opened up markets that were previously closed to Maxim Crane.”