Crane Anti-2-Block
The LIFTek L25 Wireless Anti-Two-Block System is built to last. Most are in service for 10-15 years. Easy to repair in the field (not a throw away product!). Simple operation and installation. Universal fit on any crane or hoist. Best value – total operating cost – about 7 cents per hour. Change battery once every 5 years. Same Day Shipping on systems, parts and repairs. Immediate technical support. Call 1-888-LIFTek8. The L25 is made in the USA and is the choice of major OEMs like Terex, National, Manitex and others
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L20 A2B System - discontinued 2004 Most parts and service available. -
Call LIFTek for these replacement parts.- Lithium D-cell battery replacement kit (L2581A)
- Alkaline battery pack - 3C (L2594-3C)
- L25 Antenna Replacement kit (L2545)
- Boom Switch Storage Flag (L2516)
- Boom Switch Cover (L2618)
- Eyebolt w/ mounting nut (4" or 6")
- Boom Switch Transmitter PCB Assembly (L2540A)
- Boom Switch Gasket (L2508)
- Antenna Strain Relief (switch - L2258, RX - L2256)
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Air lockouts and single lever control kits are also available for lattice cranes. These are used on air control systems which use 1/4" or 3/8" air lines. Typically found on American Cranes. -
These kits include some of the basic items we want on hand when installing one of these valves. The kits include 10 feet of oil resistant, flexible SO cable, crimp terminals, cable ties and the installation instructions. (We typically supply one kit per valve, so if you need purchase 3 valves, you would also get 30' of cable and sufficient terminals, ties etc. for 3 valves) -
These kits supply an external relay and installation instructions for driving existing OEM lockout valves on your crane when retro-fitting the L25 Radio Anti-Two-Block System. These kits, when properly installed, will insure that the L25 actuates your lockouts independently of any existing load system and will not interfere with their operation. -
Hydraulic Lockout Valve Assy (12V, 40gpm, 5000psi, 16SAE ports Alum body) -
Hydraulic Lockout Valve Assy (15 gpm, 5000 psi, SAE8 1/2" ports, w/ Manual Override, 12V 28W Coil, DIN field wireable connector, 5.6" x 3.4" x 1.5") -
These 3000 psi valves are used to shut off crane functions on hydraulic cranes during a two-block (or overload) condition. Used on winch up, telescope out, boom down. They automatically allow corrective action: winch down, telescope in, boom up. -
This section explains how to specify the size, number and voltage of lockout valves for your crane. These valves will most likely NOT be needed if your truck already has a factory installed anti-two-block system. The L25 will drive those valves. Please check with us to see if a relay kit might be needed. -
USTC Cranes were supplied with L20 and L25 Radio A2B Systems. Parts and service is available for these units. Boom transmitter switch and power pigtail may vary. Please provide model and serial number from these units when ordering parts. -
L25 Radio A2B - used on digger derricks An anti-two-block is now required by OSHA when using a digger derrick for regular crane work. Only pole handling is exempted. This L25 includes a special weight and chain which reduces wear when used with synthetic rope. Weight is painted black -
L25 Radio A2B systems supplied on certain model Jomac and Skypicker Boom Trucks. Compatible parts and service are available for the units. Power pigtails (connection to the truck power) can vary. Please confirm your type when ordering. See the photo showing the 3 types.