Product Overview

Fuwa crawler cranes work on ground that punishes undercarriage — mud, rock, sand, spoil and constant tracking from one lift position to the next. This range covers the crawler crane parts that absorb that punishment: track shoes, track chains with pins and bushes, drive sprockets, upper and lower rollers, idler wheels and the track tension unit.

The parts are quoted for Fuwa QUY crawler classes from the 35 t machines through the 350 t class, and the model table below shows every class we cover. Fleet buyers usually need one machine's track frame at a time, so a complete undercarriage for a single crane can be quoted on one enquiry: shoes, chain, sprockets, rollers and idlers confirmed together rather than ordered piece by piece over several weeks. The same enquiry can also carry hydraulic, electrical, engine and maintenance items a machine needs while it is down.

As a crane parts supplier we put the fitment question before the stock question. Send the machine model and the number on the component you are replacing, and the answer you get is whether that part belongs on your crane — not simply whether something similar is on a shelf.

Most enquiries come from crane fleet maintenance teams, hire and rental yards, repair workshops and aftermarket dealers, and the shape of the order is similar across all of them: shoes in sets, rollers and idlers in pairs or full runs, sprockets one or two at a time. Every item is a new crane spare parts component, matched to a Fuwa class and checked against the machine before it is quoted.

Covered Fuwa Models

Undercarriage Components

• Track shoes — bolted to the chain links, these are the ground plates that spread the crane's weight and bite into the surface, so the machine can track and set up on soft or uneven ground.
• Track chains, pins and bushes — run right around the track frame and carry the drive from the sprocket to the shoes; the chain is a matched assembly, so link count and pitch have to suit the machine class, and it is one of the crane parts most often renewed as a set.
• Drive sprockets — sit at the drive end of the frame, turned by the travel gearbox, with teeth that engage the chain bushes to move the crane.
• Upper (carrier) rollers — mounted along the top of the track frame, they support the returning run of the chain and keep it aligned with the sprocket.
• Lower (track) rollers — carry the machine's weight on the ground run, taking the vertical load as the crane tracks and works.
• Idler wheels — fitted at the front of the frame, they lead the chain around the end of the track and hold its alignment.
• Track tension unit — the recoil and tensioning assembly at the front of the frame, set to keep the chain at working tension as new components bed in.

Materials & Build

Undercarriage components in this range are supplied in 35SiMn, 35SiMnMo and 28CrMnMo, the alloy steels normally specified by a crane parts supplier for construction machinery spare parts of this class. Each grade behaves differently under impact and abrasion, so the one we quote follows the component and the duty it does on your machine.

On a crane of this size the grade matters as much as the number. These heavy equipment parts work in rock, mud and abrasive spoil, and steel that is not matched to that duty usually shows the difference as early wear rather than as a clean failure you can point to.

Every part is supplied new. If your workshop or fleet standard names a steel grade for rollers, idlers or sprockets, put it in the enquiry and the quotation comes back against it. Where no standard is given, we quote the grade normally used for that component on your Fuwa class and tell you which one it is, so you can compare it with what came off the machine.

Fitment Confirmation

1. Start at the machine plate and note the full Fuwa model, including any letter or suffix after the number, because variants of the same base model can carry different undercarriage components.
2. Find the number on the crane parts you are taking off — stamped into the steel, cast into the housing, or on a riveted plate — and copy it exactly as it reads.
3. Record the position and quantity: left or right track frame, upper or lower run, front or rear, and how many pieces of each component are going on.
4. Photograph the old component overall, straight onto the mounting face, and close enough to read the number and show the wear pattern across the surface.
5. Send the model, the component number, the quantity and the photographs to our team.
6. We check the number against the Fuwa class and come back with a confirmed part, or with the one or two extra details — a measurement, a bolt-hole count, a photo of the mounting flange — that will settle it.

Working Environments

• Construction and infrastructure sites — cranes tracking over compacted fill, mud and rubble between picks, which is where these construction machinery spare parts are consumed fastest and where shoes and lower rollers are the items most crews keep spare.
• Crane hire and rental fleets — machines move between contracts and ground conditions constantly, so a rental yard tends to hold heavy equipment parts for its most-used classes instead of ordering against a breakdown.
• Ports, terminals and shipyards — long shifts on concrete and steel decking with dust and salt in the air, work that puts steady hours on rollers, idlers and tension units, so the crane parts for a busy terminal are usually kept on site.
• Mining and quarrying — abrasive rock and heavy load cycles, where sprockets, chains and shoes are often replaced on a planned schedule rather than on failure.
• Bridge, precast and heavy fabrication yards — repeated short tracking between lifts, so the chain, sprocket and roller group wears together rather than one part at a time.
• Where cranes sit for weeks — machines parked on one lift for a long project still move the chain and sprocket each time they reposition, and it is worth checking the whole track frame before the next contract rather than during it.

Ordering & Delivery

Installation & Track Tension

1. Confirm what is staying on the machine before you order: which track frame side, which components are being kept, and how worn those retained parts are. New shoes or rollers can go on alongside parts that still have life in them — that is how most track frames are rebuilt — so a complete set of crawler crane parts is not needed to get a machine back to work.
2. Treat the drive end as a pair. A new sprocket turning a chain that has already stretched wears its teeth first, and a new chain running on hooked teeth does the same in reverse, so where both are near the end of their service life they are normally renewed together.
3. Keep a run of rollers consistent. Replacing rollers one at a time down one side leaves the new ones sharing load with worn ones and taking the wear by themselves; renewing the run lets the track frame settle and wear evenly.
4. Check the tension unit before the track goes back together. The recoil spring and grease cylinder are what hold preload in the chain, and a unit that no longer returns freely will let tension drop away as the machine tracks.
5. Set tension to the figure the operator's manual gives for your Fuwa model rather than to a general rule, and set it with the machine standing on firm, level ground so the chain lies naturally across the rollers.
6. Take the slack reading after the machine has tracked a few metres, not straight after assembly. A freshly built track frame settles onto the sprocket, so the reading taken in the workshop is not the reading the crane will show on site.
7. Set both track frames the same. A crane that tracks in circles, as most do, wears the left and right sides at different rates, so check and adjust each side instead of copying one from the other.
8. Re-check after the first shifts and again at the next service. New heavy equipment parts bed in, the chain usually slackens slightly before it settles, and a chain left too loose will climb the sprocket teeth while one left too tight loads the pins, bushes and roller bearings. If the chain still climbs after tension is set to the manual figure, inspect the sprocket teeth and the recoil spring before adjusting further.

Finish & Machining

Machined Working Surfaces

The surfaces that carry the load are machined rather than left as they come off the casting or forging: sprocket teeth, roller treads and flanges, idler rims, and the mounting faces and bolt-hole faces that seat against the track frame. Bore and seal faces where the component turns are finished the same way. Fine machining marks are normal on a new component and are not a defect — if you are checking a part before it goes on the machine, the mounting face and the tooth profile tell you more than the outside of the housing.

Paint, Protection And Variation

Non-working surfaces are painted to protect the steel during storage and shipping rather than for appearance. These components live under a crane in mud, dust and water, so the finish you receive can differ between components and between production runs: a different shade of paint, or a scuff picked up in transit on a painted face, has no effect on fit or on how long the part lasts. Machined surfaces are protected for the voyage and wiped down before the part is fitted.

What The Photographs Show

If you are comparing quotations, ask for pictures of the actual crane spare parts you are being offered rather than a catalogue illustration: the complete component, a view straight onto the mounting face, a close view of the machined surface, and the number cast, stamped or riveted on the part. We can photograph the items going into your shipment so you can hold the image against the component coming off your machine and see that the number, the mounting pattern and the working surfaces are the ones you ordered.

Checked Before Packing

Each item is checked against the confirmed model and component number before it is packed, and the quantity is counted against your order. Where appearance has to match what is already on the machine — a fleet paint standard, for example — say so in the enquiry and we will match what can be matched and tell you plainly where it cannot. If a part arrives wrong or damaged, photograph it as received, keep the packing, and send the details to your sales contact; we compare it with the number confirmed on the order and agree the next step with you.

Discontinued & Hard-to-Find Parts

When a machine is out of production but still working, the part number matters more than ever. If the number you have is discontinued or hard to trace, send us the machine model together with that number: we search our supplier network, confirm what is genuinely available, and give you a straight answer before you commit. Where the original is no longer made, we set out the alternatives we can actually supply, or an upgrade path, and coordinate samples, inspection and made-to-order work with the suppliers we buy from. Sourcing, consolidation and export handling stay with us.

FAQ