A crawler crane rides on its track frame, and the lower rollers are the parts that carry that load. Also called bottom rollers or track rollers, they run inside the track chain, hold it in line and spread the weight of the machine and its load across the track shoes instead of letting it hang on the drive sprocket and idler. When one seizes or wears a flat, the whole track run starts to slap, the chain climbs the flanges, and the components either side of it begin to suffer. Replacing a worn roller early is the cheapest maintenance the undercarriage will ever get.
This is a new lower roller for the FUWA (Fushun) QUY crawler crane track frame, machined from 35SiMn, 35SiMnMo or 28CrMnMo alloy steel and finished with a black protective coat. It arrives as a complete bolt-on assembly with its mounting bracket, so the fitter is not rebuilding a roller on the bench before it can go back on the machine. Every roller is 100% new — no reconditioned cores, no repaired shells. As crane parts suppliers working with fleets, rental yards and repair workshops, we match each roller to your model, serial number and the number stamped on the old part before anything is packed.
| Component | Lower roller (bottom track roller) |
| Machine fitment | FUWA (Fushun) QUY crawler crane track frame |
| Material options | 35SiMn / 35SiMnMo / 28CrMnMo |
| Material form | Cast steel roller body with machined running surfaces |
| Condition | 100% new, not reconditioned |
| Roller form | Double-flange body on a bolt-on mounting bracket |
| Shaft | Machined central shaft through the roller body |
| Finish | Black protective coating, bare metal running surface |
| Dimensions | Matched to your old roller, drawing or measurements |
| Fitment check | Model, serial number and the number stamped on the old part |
Wear on a lower roller shows up long before the roller stops turning. The flange thins and starts to lip, the running surface picks up flat spots, grease weeps past the seal, or the shaft develops play inside the bracket. On the machine it feels like a track that slaps, a chain that rides up on the flanges through a turn, or tension that will not hold. Any of those symptoms is a reason to inspect the whole track frame rather than the noisy roller alone: crawler crane parts wear as a system, and one seized roller loads the two beside it.
Matching the roller is straightforward when you work from the part itself. The number stamped or cast on the old roller, the machine model and serial number, and a photo with a tape measure across the flange will identify the correct lower roller in almost every case. As crane parts suppliers we would rather check twice than ship a casting that has to travel back across an ocean, so if the number has worn away, send the measurements and we will work from those.
On a used crawler crane, wear across a track frame is rarely even, so check every roller while the machine is up, not only the one that failed. If three or four rollers are already at the flange limit, a set is usually the better buy: the new roller then runs against fresh neighbours instead of against worn ones that keep the chain jumping. Tell us how many you need and where they sit on the frame, and we will put the crane spare parts list together for you.
Hitachi coverage runs from the KH carriers that are still common in rental fleets through to the CX machines and the PD piling units built on the same track frames: KH100, KH125, KH150, KH180, KH230, KH250, KH300, KH500 and KH700; CX300, CX500, CX550, CX650, CX700 and CX900; PD7 and PD100. Many of these machines are on their second or third undercarriage, and the lower rollers are often the part that is hardest to source locally. If the number on your old roller has worn away, send the model, the serial number and a photo with a tape measure across the flange — that is usually enough for us to identify the right lower roller. Heavy equipment spare parts for older Hitachi carriers are a regular part of what we ship, so ask even if the machine has been out of production for years.
The Hitachi Sumitomo SCX line is covered from SCX300, SCX400, SCX500, SCX700, SCX800 and SCX900 through SCX1200, SCX1500, SCX2000, SCX2500, SCX2600 and SCX2800. These machines spend their working lives on foundation, civil and port projects, which means wet grit around the track frame and rollers that often wear on the flange before the running surface is finished. When you order for an SCX, tell us which position the roller sits in — front, centre or under the drive end — because track frame layouts differ between sizes and the position helps us confirm the part number against your frame.
SANY coverage runs across the SCC crawler range: SCC500, SCC550, SCC600, SCC700, SCC750, SCC800, SCC1000, SCC1250, SCC1500, SCC1800, SCC2600, SCC3000, SCC4000, SCC5000, SCC6500, SCC7500, SCC8100, SCC8200, SCC8300, SCC10000 and SCC16000. SANY undercarriage work often arrives together with structural repairs, so if the same machine also needs crane boom parts, say so at the start and we will quote the rollers and the boom sections together instead of in two shipments.
SCC cranes are worked hard on civil and precast jobs, and the track frame takes the grit that comes with that. Alongside the undercarriage we keep hydraulic crane parts for the same machines — main pumps, travel motors and valve blocks — so a track frame repair and a hydraulic fault can be handled in one conversation.
XCMG is covered across the QUY range from 38 to 350 tonnes, which takes in the smaller truck-mounted workhorses as well as the heavy crawler frames on port and pile-driving duty. An XCMG that spends its week dragging a pile driver wears its rollers very differently from one on clean lifting work, so tell us how the machine is used and we will match the roller grade to it. Send the model, serial number and the number on the old roller; where the roller is too worn to read, a drawing or a set of measurements works just as well. Heavy equipment spare parts for these crawler frames ship from the same warehouse as the FUWA, SANY and Zoomlion stock.
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.
They are new replacement lower rollers built to the original dimensions in 35SiMn, 35SiMnMo or 28CrMnMo steel, and we do not present them as boxed original parts. If your workshop or your customer specifically requires a genuine-branded item, tell us at the quotation stage and we will confirm what is available for your model. Being clear about this is how crane parts suppliers should work, because the wrong description causes problems long after the part has been fitted.
All three are used for these roller bodies, and the right one depends on what the original roller was made from and how the crane works. Give us the machine model and the duty — continuous lifting, pile driving, quarry or port work — and we match the grade to the original specification where it is known. If you are replacing a set, keep the same grade across the whole set so the rollers wear at a similar rate.
Yes. Each roller is supplied as a bolt-on assembly with its mounting bracket, bore and central shaft, as shown in the photographs. If your track frame uses a different bracket style from the one pictured, send a photo of the old mounting and we will confirm the correct version before the order is packed.
That is a common starting point for us. Send photos of the track frame and the numbers from as many rollers as you can still read, and we will price a full set so you know what the undercarriage will cost before the machine goes to work. Older machines are usually the ones where parts are hardest to find locally, which is exactly where a broad stock range helps.
Yes — upper rollers, idlers, drive sprockets, track shoes and tension devices for the same frame, and crane boom parts such as wire rope, sheaves and structural sections when a repair goes beyond the undercarriage. Sending one list is faster than ordering in stages, because the availability of everything can be checked together.
Hitachi, Sumitomo, Hitachi Sumitomo, FUWA, SANY, Zoomlion and XCMG, with the model lists on this product as the current coverage. If your machine is not on a list, send the model and serial number anyway — crawler crane parts often cross over between models, and we can tell you quickly whether we can match it.
We do. Hydraulic crane parts — main pumps, motors, valve blocks and cylinders — are supplied for the same SANY, XCMG, Zoomlion and FUWA machines, and they can travel in the same shipment as an undercarriage order. Describe the fault and the machine, and our engineers will help you narrow down which component is actually at fault before you buy.
Yes. Mixed fleets are normal for rental yards and contractors, and construction machinery spare parts for several brands can be packed and shipped together. Send the full list with a model and serial number for each machine and we will confirm line by line before anything is packed.
