Product Overview

We supply new FUWA (Fushun) boom sections for crawler cranes: the boom foot that pins into the turntable, the boom head that carries the sheave assembly, and the inserts that make up the length between them. One bent or cracked section can be replaced while the rest of the lattice stays in service, which is usually the difference between a repair measured in days and a boom rebuild that runs for weeks.

Every section is built to the dimensions of the original rather than to a stock size. Send the section's measurements, and the section is matched to those figures. Parts arrive new, not reconditioned, and painted before they leave the warehouse.

Because crane boom parts are matched section by section rather than as a complete boom, that matching check matters more than the model name on the plate. A section fits when its critical interfaces line up; a chord that has been kinked, a pin bore that has gone oval or a bracket torn out of its weld is a replacement, not a straightening job, because a straightened chord keeps the memory of the bend and loads the pins unevenly.

The same order can cover the parts a boom repair disturbs — pins, spring pins, bolts, sheaves and wire rope — along with the undercarriage, engine and hydraulic crane parts that keep the machine earning between boom jobs.

Fleet maintenance teams, workshops rebuilding a machine for a customer, and contractors who would rather change one insert than stop production all work this way. It is also the practical route for a used crawler crane whose boom no longer matches its parts book: older machines often carry sections that were rebuilt or swapped years ago, and building to the part in front of you solves what a catalogue number cannot.

Boom Sections & Component Kits

• Boom foot — the base section that pins the boom to the turntable. It arrives as an assembly with one swing wheel, the dragrope device, two bearings, two oil cups, the angle indicating device, two pins and eight spring pins, so the boom can be reconnected and re-reeved without chasing small hardware.
• 3 m insert — the short bay used to fine-tune boom length and to replace damage close to the foot. Supplied with two U-type bolts, four washers, four nuts, four plates, four clamps, four platform plates and the insert section itself.
• 6 m insert — the general middle section for standard lifting duty. Each one comes with four pins, four spring pins, two brackets, thirty-two bolts, two blocks and a further eight brackets.
• 9 m insert — the long bay for reach. Supplied with four pins, four spring pins, forty-eight bolts, three blocks, three brackets, twelve brackets and the section itself.
• Boom head — the tip section that carries the sheave assembly, with grooved pulley wheels, brackets and linkage pins. Tell us if you intend to reuse your existing sheaves and the head is matched to them.
• One bay at a time — sections are sold individually. On most crawler crane parts orders the insert is the only item needed, and the pins, spring pins and bolts already on the machine can be reused if they pass inspection.
• Parts that come with the section — pins, blocks, brackets, sheaves and wire rope can be supplied alongside it, together with the wider construction machinery spare parts range.

Material & Build

The boom foot is a casting. The inserts and the boom head are fabricated from 35SiMn, 35SiMnMo and 28CrMnMo alloy steels, chosen for the load path each section carries and for the wall thickness it can take, and the grade is settled when your original part is matched.

Construction is a welded lattice: chords with diagonal bracing, end plates welded on and then bored for the connecting pins. Bracket joints stay bolted where the original was bolted, so a section can be stripped, shimmed and rebuilt on site instead of being sent away. Pin bores and sheave grooves are machined and left bare; the rest of the frame is painted.

What comes off a drawing is only as good as what goes into it. As crane parts suppliers we would rather spend a day on dimensions than ship a section that will not pin up, so photographs, a tape measure and the number stamped on the old chord carry more weight than a model list.

Specifications

Damage Assessment

1. Support the section and take the load off it. Damage judged with the boom under tension is damage misjudged, and it is how the wrong crawler crane parts get ordered; block the section and look at it free of load.
2. Look past the paint. Cracks usually start at the chord-to-lacing welds and at the ends of a bay that was straightened once already, and a dent that looks local often runs a metre along the chord.
3. Check the pin bores and end brackets. Ovality, a torn bracket weld or a lug that has moved out of line will stop a new section from pinning up even when the frame itself still looks sound.
4. Inspect the boom foot as an assembly. Bearing play, a worn swing wheel, a stretched dragrope device and a damaged angle indicating device belong in the same repair, because the boom has to come off to reach them.
5. Look at the boom head on its own. Grooved sheaves worn through the rope path, or a pulley that no longer turns freely, will damage a new rope within hours of going back to work.
6. Read the number on the section. Two items can look identical and still differ in bracket position or pin diameter, which is why the number stamped on the old part counts for more than a photograph in heavy equipment spare parts work.
7. Decide on the frame, not on the budget. A straightened chord, an oval pin bore or a torn bracket means replacement; a scuffed paint line or a bent guard does not.

Fitment Details to Supply

• Crane model and serial number — narrows the boom type and the vintage of the machine.
• The section — boom foot, boom head or insert — and which bay it is.
• The number on the old section — stamped or stencilled on a chord or an end plate, and the surest identifier you can send.
• Key dimensions — pin-centre distance at each end, chord spacing, lug and bracket positions, and overall length from end plate to end plate.
• Photographs — the whole section, a close-up of each end, the damage itself, and one shot with a tape measure held across the pin centres.
• A drawing or parts book page — if one exists, it saves a round of questions.
• The fittings you plan to reuse — pins, spring pins, bolts, sheaves. If a sheave or bracket is being carried over, its condition decides whether the new section is built to suit it.
• How the damage happened — impact, transport knock or a machine fault. A seized sheave or a hydraulic crane parts failure changes what should be checked before the new section goes on.
• The machine's history — a used crawler crane that has been rebuilt before often carries a section that no longer matches its parts book, which is exactly where a drawing-based match earns its keep.
• Anything else you need — rope, pins or construction machinery spare parts can be matched at the same time.

Fitting & Reassembly

1. Clean and inspect the mating faces before anything is lifted: pin bores, end plates and bracket faces free of paint build-up, burrs and old shim, with the crane spare parts you intend to reuse laid out for inspection.
2. Lift with slings rated for the weight and keep the section supported until the first pins are through. A lattice section is stiff but not rigid, and it will twist if it is held at one end only.
3. Fit the pins dry and by hand where you can. If a pin has to be driven, stop — the alignment is wrong, and forcing it will oval the bore before the section ever takes a load.
4. Secure the spring pins first, then the bolts at the brackets, working evenly around the joint instead of tightening one corner down.
5. Torque to the figures in the manufacturer's manual for that crane model. Heavy equipment spare parts are matched to a machine, and torque values work the same way — a figure carried over from another model can stretch a bolt or crush a bracket.
6. Reconnect the dragrope device, check the angle indicating device against the boom's real angle, and confirm the sheaves turn freely with the rope seated in the groove.
7. Run the boom through a full luffing cycle without load before the first lift, then re-check pins and bolts. New joints settle, and a re-torque after the first cycle is normal practice.

Ordering & Delivery

Technical Support & Model Matching

Not sure which part matches your machine? Send us the model, serial number and the original part number — or a photo and key dimensions — and our engineers will confirm the correct item and check availability before you commit. They have spent more than ten years in construction machinery and can talk you through fault-finding, installation and commissioning by phone, email or video. We also trace parts for discontinued and legacy models. Support runs 24/7 from Shenyang, China, where we have been supplying buyers since 2017.

FAQ