ACX 750

Crawler Crane Engine

Make – Mahindra Navistar or suitable engine
Model – 6.12TCA
Displacement – 7.2 Ltrs
Rated Power – 230 hp @ 2200 rpm
Maximum Torque – 980 Nm @ 1450 rpm
Cooling system – Water Cooled
Air Cleaner – Delineation element type
Fuel Tank – Capacity 350 Ltrs.

Hydraulic system of Crawler crane

Hydraulic system consists of pumps, control valves, motors, counter balance valves, pilot valves, hydraulic reservoir & oil cooler.Pump(s): Two no. pumps driven by engine through heavy duty pump drive. One double displacement pump is used for main hoist, auxiliary hoist, luffing and travelling. Triple pump is used for slewing, oil cooling and pilot control of all operations.Main hoisting motor : Two speed variable piston type.
Boom hoist motor : Piston type
Auxiliary hoist motor : Piston type.
Slew motor : Piston type.
Traveling motor : Two nos. piston type for independent operations for left and right track (s).Control Valve(s) : Hydraulically pilot operation spool type control engine for luffing main hoisting, auxiliary hoisting, travelling and slewing operation.

Oil cooler : Oil to air heat exchanger with hydraulically driven fan.

Hydraulic oil reservoir : 490 ltrs capacity hydraulic tank is fitted with suction strainer, return line filter, breather cum filter, butter fly valve and drain valve.

Hoisting System

Boom hoist : Boom hoisting is achieved through a planetary reducer powered by hoist hydraulic motor and fitted with counter balance valve. Fail safe brakes are operated hydraulically and external drum locking is also provided. Single drum with 20 mm dia wire rope with a line speed of 50 mtrs/ min is provided.Main hoist : The winch drum is driven through a planetary reducer powered by hydraulic variable piston motor. Spring applied hydraulic fail safe brake along with counter balance valve is provided. External drum locking mechanism is also provided. The main drum is fitted with 22 mm dia wire rope and has a line speed of 115 mtrs/ min. and max line pull of 12000 kgs.Auxiliary hoist : Auxiliary hoisting mechanism can also be provided as optional feature. The auxiliary hoist is driven through a planetary reducer powered by hydraulic variable piston motor. Spring applied hydraulic fail safe brake along with counter balance valve is provided. External drum locking mechanism is also provided. The main drum is fitted with 22 mm dia wire rope has a line speed of 75 mtrs / min. and m.. line pull of 12000 kgs.

Slewing system :

Slewing is achieved through planetary reducer and pinion gear powered by hydraulic motor providing 360° rotation for the complete super structure.The heavy duty slew ring is internal geared type and provides unlimited slewing in either direction. Spring applied hydraulic multiple disc brake is mounted on the slew gear box and mechanical swing lock is provided.

Electrical System

The electrical system is 24V DC (negative earth) and is provided with 2 Nos 180 AH-12 V heavy duty batteries connected in series.The electrical system comprises of ignition switch, starter, indicator light(s), working light(s), cab light(s), fan wiper, limit switches, guage and digital load display (LCD).

Super Structure

The revolving super structure is all welded, precision machined and is of robust construction. The structure is fabricated with high tensile plates and the machined upper hpw structure houses main hoist, boom hoist and auxiliary hoist. The side platforms of super structure houses the engine assembly and other hydraulic assemblies. The super structure is mounted on slew bearing and all components are easily accessible for daily maintenance checks and servicing.

Under Carriage

Under Carriage consists of the “H” frame and hydraulically extendable track frames as a single assembly. The hydraulic extension of the track frames is achieved through hydraulic cylinder operated by a control lever. The under carriage with the tracks retracted hydraulically, provides for easy movement and transportation of the complete under carriage as a complete assembly. The “H” frame and the crawler side frames are all welded, precision machined and of box type construction. The slew bearing is mounted on the machined top surface of the under carriage.Crawler Tracks : The crawler mechanism consists of drive sprockets, idler wheels, track rollers, carrier rollers and two tracks. The tracks comprise of 63 Nos. of track shoes(742 mm X 270mm) in each track. The track adjustment device with hydraulic jack and shim plate packs is provided.The crawler drive is achieved through hydraulic planetary gear box in each track powered by hydraulic motor. Spring applied hydraulically released brakes are provided. The steering is achieved through hydraulic system providing skid steering and counter rotating steering in opposite direction(s). The max. travel speed is 1.5 km/hr.

Main Boom

The length of main boom is 57 mtrs. including top and bottom booms (each 6 Mtrs.) and boom inserts (3 mtrs- 02 nos , 6 mtrs – 02 nos and 9 mtrs – 03 nos). The flyjib of 18 mtrs. length can also be provided optionally which consists of a top and bottom section (4.5 mtrs. each) and 2 Nos. inserts (4.5 mtrs. each). Flyjib can be erected at 10° and 30° offset angles.The main boom is fabricated from high tensile (alloy steel) seamless round tubes .The various sections of boom and flyjib are connected together through pins and connectors made from alloy steel and heavy duty pendant ropes.

Hook Block(s) of Crawler Crane

The crane is supplied with 3 hook blocks of 75 Tons, 30 Tons and 8 Tons capacity each. The 75 tons hook block has 05 pulleys suitable for 10 falls where as 30 tons hook block has 03 pulleys which is suitable for 06 falls. The 9 ton hook block is used for single line application.

Operator Cabin provided in Crawler Cranes

The operator cabin is fully enclosed and ergonomically designed. The cabin is mounted with rubber pads and is well ventilated and is provided with adjustable seat, wiper, light, fan, instrument cluster, air conditioner ( optional) ,control levers and rear view mirror. Ergonomically placed operator console and instrument cluster ensures ease of operation.

Safety Equipment used in Crawler Cranes

The following safety devices / mechanisms are provided :-

  • Safe Load Indicator with over load cut off function.
  • Counter balance valves.
  • Hoisting limiters provided for main hoist, boom hoist and auxiliary hoist.
  • Boom angle indicator.
  • Boom back stopper.
  • Mechanical drum locking system for all hoist drums.
  • Mechanical swing lock.
  • Tri colour audio visual external safe load indicator.
  • Audio slew alarm.
  • Safety brake on hoists.

ACX 750 Crawler Crane Specification


Load Chart of ACX 750 Crawler Crane