31000 Manitowoc crane - load chart, specs & dimensions (2010 - 2018)

Variable Position Counterweight (VPC)

The Manitowoc 31000 features the only self-supporting counterweight system in the industry. By suspending the counterweights above the ground, site preparation is greatly reduced. As load increases on the hook, the VPC is automatically repositioned to maintain a balanced load moment.

Variable Position Counterweight

The patented Variable Position Counterweight (VPC) system maintains an optimum crane load moment by automatically positioning crane counterweight between the fully retracted position of 8,38 m (27’ 6”) and fully extended position of 29,0 m (95’ 1”). The crane is equipped with a maximum 964 t (2,126,000 lb) of counterweight comprised of a 3-piece counterweight tray and forty-two 20 t (44,000 lb) counterweight boxes. No carbody counterweight is necessary because of exclusive VPC technology.

Controls

Modulating electronic over hydraulic controls provide infinite speed response directly proportional to the operator’s control lever movement. Controls include Manitowoc’s exclusive EPIC™ Electronically Processed Independent Control system with CANBus technology providing microprocessor driven control logic, variable displacement pump and motor control, on-board diagnostics, and service information. Block up limit control is provided for load hoist and whip lines. The integrated Rated Capacity Limiter (RCL) is provided for main boom. The RCL for the extended upper boom point, luffing jib, and fixed jib is provided with each of these optional configurations. Travel, swing and VPC alarms are standard.

Hydraulic System

High-pressure variable displacement piston pumps, driven by two (one per engine) multi-pump transmissions, provide independent closed-loop hydraulic power for load hoist drums, boom hoist, VPC, swing, crawlers, and optional luffing hoist. Accessory hydraulic power, for actuation of cylinders and powered pins, is provided by two variable displacement piston pumps. It is also shared with the crawler drive. Hydraulic reservoir capacity is 1 741 L (460 gal) and is equipped with breather, sight and electrical level indicator, clean out access, and internal diffusers. Each function is equipped with relief valves to protect the circuit from overload or shock. Replaceable, ten micron (absolute) full flow tank filters are standard. All hydraulic fluid is filtered prior to returning to the reservoir. The hydraulic system includes a hydraulic fluid heat exchanger designed for high cooling during ambient temperature operation.

Swing System

Eight swing drives are utilized. Each is powered by a fixed displacement axial piston motor coupled to a planetary reduction gearbox. The motor is connected to the mating gearbox through a spring applied, hydraulically released wet multi-disc brake and mechanical disconnect. Four swing drives (two on each side) are mounted to each of the front and rear roller carriers. Each drive is equipped with swing pinion aligning directly with ring gear teeth for optimum control and smooth swing. Swing system maximum speed: 0.50 rpm.

Roller Path and Ring Gear

Integrated into the carbody beams is a precision machined 12,19 m (40’) outside diameter roller path, protected by replaceable high strength steel wear plates. Precision machined ring gear segments are mounted internal to the roller path to provide precise swing.

Carbody

The five-section, high strength welded steel carbody is comprised of two front/rear beams, two side beams, and a center beam with integral kingpin. The carbody beams are FACT™ connected and all pins hydraulically inserted. Eight hydraulic jacking cylinders, four mounted to each side carbody beam, are provided to assist in crane assembly/disassembly.

Assembly Equipment

Two boom raising dollies provided standard for mast/backhitch raising. Portable diesel/hydraulic power unit; trailer mounted, 12 volt system power, two independent 207 bar (3,000 psi) hydraulic circuits providing power through two hose reels. An assembly assist tool kit, consisting of two hand-held hydraulic cylinders for driving boom pins, a manually actuated hydraulic valve for remote cylinder operation and two boom rigging stands is provided. Also, included is a hand operated winch to assist with connection of boom suspension straps. Rigging kit consisting of lifting slings and chains, snatch block, load line reeving assist components, and crawler track handling bracket provided standard.